Prevent Bluetooth alerts from interrupting modal warnings

PRIVACY_POLICY.md

@@ -73,7 +73,7 @@ Private group members receive the group's name, roster, key epoch, and encrypted
 
 Internet-backed features are optional. When enabled or used:
 
-- Private fallback messages use encrypted NIP-17 gift wraps. Relays can observe event and network metadata but not the message plaintext.
+- Private fallback messages use BitChat's app-specific encrypted envelopes. This format is not NIP-17, NIP-44, or NIP-59 compatible. Relays can observe the recipient public-key tag, event timing and size, and network metadata, but not the message plaintext or stable sender identity.
 - Public location-channel messages, notes, notices, and presence include a geohash tag, event kind, timestamp, and a public key. A geohash reveals an approximate area; finer precision reveals a smaller area.
 - The optional mesh bridge publishes bridge-enabled public mesh messages and presence to a neighborhood rendezvous cell. Those messages are public to participants and relays for that cell. A per-message “nearby only” choice prevents that message from crossing the bridge.
 - Bridge courier drops contain opaque end-to-end encrypted envelopes and a rotating recipient tag. Relays still observe timing and network metadata.
@@ -103,7 +103,7 @@ Private and public features use different protections:
 
 - Mesh private sessions use Noise XX with X25519, ChaCha20-Poly1305, and SHA-256.
 - Private group messages use ChaCha20-Poly1305; group state and relevant mesh packets use Ed25519 signatures.
-- Nostr events use secp256k1 Schnorr signatures. NIP-44 v2 private payloads use secp256k1 key agreement, HKDF-SHA256, and XChaCha20-Poly1305.
+- Nostr events use secp256k1 Schnorr signatures. BitChat private envelopes use secp256k1 key agreement, HKDF-SHA256 with a BitChat-specific domain separator, and XChaCha20-Poly1305. The envelope format is proprietary, only interoperates with BitChat clients, and does not provide forward secrecy against later compromise of the recipient's static Nostr private key.
 - The persistent private-message outbox uses ChaCha20-Poly1305 with a key held in the keychain. Some other protected local identity state uses AES-GCM.
 - Public mesh, bridge, geohash, and board content is signed or authenticated as appropriate but is intentionally not confidential.
 

Package.swift

@@ -63,7 +63,11 @@ let package = Package(
                 // Only the vector fixture: declaring the whole "Noise"
                 // directory would claim its .swift test files as resources
                 // and silently drop them from compilation.
-                .process("Noise/NoiseTestVectors.json")
+                .process("Noise/NoiseTestVectors.json"),
+                // Frozen output produced by the released 733098bb private-DM
+                // implementation; proves receive compatibility independently
+                // of the refactored legacy generator.
+                .process("Nostr/Fixtures")
             ]
         )
     ]

README.md

@@ -19,7 +19,7 @@ This project is released into the public domain. See the [LICENSE](LICENSE) file
 - **Intelligent Message Routing**: Automatically chooses best transport (Bluetooth → Nostr fallback)
 - **Decentralized Mesh Network**: Automatic peer discovery and multi-hop message relay over Bluetooth LE
 - **Privacy First**: No accounts, no phone numbers, no persistent identifiers
-- **Private Message End-to-End Encryption**: [Noise Protocol](https://noiseprotocol.org) for mesh, NIP-17 for Nostr
+- **Private Message End-to-End Encryption**: [Noise Protocol](https://noiseprotocol.org) for mesh, BitChat private envelopes for Nostr fallback
 - **IRC-Style Commands**: Familiar `/slap`, `/msg`, `/who` style interface
 - **Universal App**: Native support for iOS and macOS
 - **Emergency Wipe**: Triple-tap to instantly clear all data
@@ -44,9 +44,50 @@ BitChat uses a **hybrid messaging architecture** with two complementary transpor
 - **Global Reach**: Connect with users worldwide via internet relays
 - **Location Channels**: Geographic chat rooms using geohash coordinates
 - **290+ Relay Network**: Distributed across the globe for reliability
-- **NIP-17 Encryption**: Gift-wrapped private messages for internet privacy
+- **BitChat Private Envelopes**: App-specific encrypted private messages over Nostr relays
 - **Ephemeral Keys**: Fresh cryptographic identity per geohash area
 
+BitChat's private-envelope format is proprietary and is **not** NIP-17,
+NIP-44, or NIP-59 compatible. It uses Nostr as a relay transport but only
+interoperates with BitChat clients. New envelopes use provisional,
+BitChat-specific public kind 1402 (not a formally reserved Nostr kind),
+encrypted inner kinds 1403/1404, and the `bitchat-pm-v1:` content prefix.
+For mixed-version delivery, clients publish both the primary kind-1402
+envelope and a compatibility kind-1059 copy. There is no date-based cutoff:
+kind 1059 must remain enabled until a coordinated iOS/Android release confirms
+that supported older clients have migrated. Receivers subscribe to both kinds
+and deduplicate the authenticated embedded BitChat payload.
+
+Private-envelope migration compatibility:
+
+| Sender | Receiver | Delivery path |
+| --- | --- | --- |
+| New iOS | New iOS | Kind 1402 is primary; the kind-1059 twin is deduplicated |
+| New iOS | Released iOS | Compatibility kind 1059 |
+| New iOS | Current Android | Compatibility kind 1059 |
+| Released iOS | New iOS | Kind 1059 with the released empty inner-tag shape |
+| Current Android | New iOS | Kind 1059 with exactly the authenticated recipient `p` tag |
+
+New kind-1402 envelopes require an empty inner tag list. The Android recipient
+tag exception is intentionally confined to legacy kind 1059 and accepts only
+the exact addressed recipient. Mailbox subscriptions cover the 24-hour
+delivery window plus Android's full 48-hour timestamp randomization and 15
+minutes of clock skew. Recovery uses
+one independent 500-event relay filter per wire kind so either format cannot
+consume the other's result budget.
+
+The two outbound migration copies are admitted to the relay queue as one
+protected batch. Queue pressure evicts ephemeral traffic first, never one copy
+of a private pair; if protected capacity is exhausted, the entire new pair is
+rejected as a whole. User-message rejection becomes a visible failed delivery;
+acknowledgements and favorite notifications retain the exact pair in a
+process-wide 256-entry bounded retry queue. A sustained outage beyond that
+bound evicts the oldest whole control pair with an explicit warning, never half
+a pair.
+If either socket write fails, the same queued pair remains pending and both
+copies are replayed on the replacement connection. A terminal relay target is
+pruned after bounded retries so one dead relay cannot wedge healthy delivery.
+
 ### Channel Types
 
 #### `mesh #bluetooth`
@@ -80,7 +121,7 @@ Private messages use **intelligent transport selection**:
 2. **Nostr Fallback** (when Bluetooth unavailable)
 
    - Uses recipient's Nostr public key
-   - NIP-17 gift-wrapping for privacy
+   - BitChat's app-specific private-envelope encryption
    - Routes through global relay network
 
 3. **Smart Queuing** (when neither available)

WHITEPAPER.md

@@ -25,7 +25,7 @@ bitchat is a decentralized, peer-to-peer messaging application for secure, priva
 Two transports implement a common `Transport` interface and are coordinated by a `MessageRouter`:
 
 * **BLE mesh** — every device is simultaneously a GATT central and peripheral, relaying packets in a controlled flood. No infrastructure, pairing, or accounts.
-* **Nostr** — private messages to mutual favorites travel as NIP-17 gift-wrapped events over public relays (over Tor where enabled), bridging separate meshes through the internet.
+* **Nostr** — private messages to mutual favorites travel in BitChat's app-specific encrypted envelopes over public relays (over Tor where enabled), bridging separate meshes through the internet.
 
 The router prefers a live mesh link, falls back to Nostr, and engages the courier system when neither can deliver promptly.
 
@@ -78,7 +78,9 @@ Courier envelopes are sealed to the recipient's *static* key with the one-way No
 
 ### 5.3 Nostr Path
 
-Private messages to mutual favorites are wrapped per NIP-17/NIP-59: a rumor (kind 14) sealed (kind 13) and gift-wrapped (kind 1059) under a throwaway ephemeral key, so relays learn neither sender nor content.
+Private messages to mutual favorites use BitChat's proprietary private-envelope protocol. An unsigned inner message (kind 1404) is encrypted and placed in a sender-signed seal (kind 1403); that seal is encrypted again inside a public envelope (kind 1402) signed by a one-time key. Kind 1402 is a provisional BitChat-specific assignment, not a formally reserved Nostr kind. Each encrypted content field is `bitchat-pm-v1:` followed by base64url of a 24-byte nonce, XChaCha20-Poly1305 ciphertext, and its 16-byte tag. Keys come from secp256k1 ECDH and HKDF-SHA256 with a BitChat-specific domain separator.
+
+This format is **not NIP-17, NIP-44, or NIP-59 compatible** and interoperates only with BitChat clients. The outer `p` tag exposes the recipient's Nostr public key to relays; the stable sender identity and plaintext remain inside authenticated ciphertext. New-format seal and envelope timestamps are randomized up to 15 minutes into the past, while the actual message timestamp is encrypted. Legacy Android envelopes can carry public-layer timestamps randomized across the preceding 48 hours. The protocol does not provide forward secrecy: compromise of the recipient's static Nostr private key can expose stored envelopes.
 
 ## 6. Store and Forward
 
@@ -105,7 +107,11 @@ Public broadcast messages are cached (1000 packets) and reconciled between peers
 
 ### 6.4 Nostr Mailboxes
 
-Gift-wrapped messages rest on Nostr relays; clients re-subscribe with a 24-hour lookback on reconnect, covering the both-devices-offline case for mutual favorites whenever either side touches the internet.
+BitChat private envelopes rest on Nostr relays; clients re-subscribe across the 24-hour delivery window plus the full 48-hour timestamp randomization used by deployed Android clients and 15 minutes of clock skew (72 hours 15 minutes total). During the rolling format migration, clients subscribe to both the provisional BitChat-specific kind 1402 and historical kind 1059. Recovery places the kinds in separate filters within one REQ, each with an independent 500-event limit, so traffic in one format cannot starve the other. Each logical payload is published first in the primary kind-1402 format and then as a compatibility legacy copy for older iOS and current Android clients. There is no calendar cutoff: legacy publication and reception remain until a coordinated cross-platform release confirms supported clients have migrated. Bounded dedup of the authenticated embedded payload collapses the migration pair at receivers.
+
+The relay send queue treats those two events as one protected batch. Capacity pressure removes ephemeral events before regular traffic and never evicts only one private-envelope copy. A queue containing only protected batches rejects a new pair as a whole: user messages surface a failed delivery, while acknowledgements and favorite notifications retain the exact pair in one process-wide 256-entry bounded-backoff retry queue shared by account and short-lived geohash transports. Sustained control-payload overflow evicts the oldest whole pair with an explicit warning rather than growing memory or splitting formats. After either socket write fails, the same pair remains pending and both copies are replayed on the replacement connection. Terminal relay targets are pruned after bounded connection retries; a batch that succeeded elsewhere retires normally, while an all-target failure returns to the transport's failure/retry policy. Receive-side dedup suppresses the replay if one copy had already reached the relay.
+
+Released iOS legacy envelopes use an empty inner tag list. Current Android legacy envelopes use exactly one inner `p` tag naming the recipient. The kind-1059 decoder accepts only those two shapes after authenticating the outer recipient and sender-signed seal; alternate recipients, duplicate tags, and extra tags are rejected. Kind 1402 remains strict and permits no inner tags.
 
 ### 6.5 Delivery Metrics
 
@@ -127,7 +133,7 @@ Bare local counters (deposits, handovers, sprays, opens, outbox flushes and drop
 * **Flooding abuse** is bounded by TTL clamps, deduplication, per-depositor quotas, connect-rate limits, and announce-rate limiting.
 * **Replay** of public broadcasts is bounded by the 6-hour acceptance window plus deduplication; private payloads are protected by Noise nonces.
 * **Metadata.** BLE proximity is inherently observable; ephemeral IDs and daily-rotating courier tags limit long-term correlation. Nostr traffic can ride Tor.
-* **No forward secrecy for sealed mail** (§5.2) is the main cryptographic trade-off of the offline path.
+* **No forward secrecy for sealed mail or Nostr envelopes** (§5.2–5.3) means compromise of a recipient's static key can expose retained ciphertext addressed to that key.
 
 ## 9. Future Work
 

bitchat/App/PrivateConversationModels.swift

@@ -265,10 +265,10 @@ final class PrivateConversationModel: ObservableObject {
         let headerPeerID = chatViewModel.getShortIDForNoiseKey(conversationPeerID)
         let peer = chatViewModel.getPeer(byID: headerPeerID)
         let displayName = resolveDisplayName(for: conversationPeerID, headerPeerID: headerPeerID, peer: peer)
-        // Geo DMs are always routed over Nostr (NIP-17); their nostr_ keys
-        // never resolve to a reachable mesh peer, so resolveAvailability would
-        // report .offline. Report .nostrAvailable so the header shows the
-        // globe instead of a misleading "offline" tag.
+        // Geo DMs are always routed through BitChat private envelopes over
+        // Nostr; their nostr_ keys never resolve to a reachable mesh peer, so
+        // resolveAvailability would report .offline. Report .nostrAvailable
+        // so the header shows the globe instead of a misleading "offline" tag.
         let availability = conversationPeerID.isGeoDM
             ? .nostrAvailable
             : resolveAvailability(for: headerPeerID, peer: peer)

bitchat/Nostr/NostrIdentity.swift

@@ -1,7 +1,8 @@
 import Foundation
 import P256K
 
-/// Manages Nostr identity (secp256k1 keypair) for NIP-17 private messaging
+/// Manages the secp256k1 identity used by BitChat's Nostr relay features,
+/// including the proprietary private-envelope transport.
 struct NostrIdentity: Codable {
     let privateKey: Data
     let publicKey: Data

bitchat/Nostr/NostrProtocol.swift

@@ -1,4 +1,3 @@
-import BitLogger
 import Foundation
 import CryptoKit
 import P256K
@@ -7,16 +6,31 @@ import Security
 // Note: This file depends on Data extension from BinaryEncodingUtils.swift
 // Make sure BinaryEncodingUtils.swift is included in the target
 
-/// NIP-17 Protocol Implementation for Private Direct Messages
+/// BitChat's private-envelope protocol transported over Nostr relays.
+///
+/// This is deliberately BitChat-specific and is not NIP-17, NIP-44, or NIP-59.
+/// It uses Nostr events and secp256k1 identities, but its XChaCha20-Poly1305
+/// payload layout is proprietary and interoperates only with BitChat clients.
 struct NostrProtocol {
     
     /// Nostr event kinds
     enum EventKind: Int {
         case metadata = 0
         case textNote = 1
-        case dm = 14 // NIP-17 DM rumor kind
-        case seal = 13 // NIP-17 sealed event
-        case giftWrap = 1059 // NIP-59 gift wrap
+        // Compatibility for BitChat releases that incorrectly emitted the
+        // proprietary payload under standard NIP kinds. Kind 1059 continues
+        // to be published and read until a coordinated cross-platform release
+        // explicitly removes it; all three legacy layers remain readable.
+        case legacyNIP59Seal = 13
+        case legacyNIP17DirectMessage = 14
+        case legacyNIP59GiftWrap = 1059
+        // Provisional BitChat-specific regular event kinds. These are not
+        // formally reserved by the Nostr kind registry. Only
+        // `privateEnvelope` is published; message and seal exist solely
+        // inside ciphertext.
+        case privateEnvelope = 1402
+        case privateSeal = 1403
+        case privateMessage = 1404
         case ephemeralEvent = 20000
         case geohashPresence = 20001
         case deletion = 5 // NIP-09 event deletion request
@@ -25,145 +39,290 @@ struct NostrProtocol {
         /// its NIP-40 expiration — the whole point is store-and-forward.
         case courierDrop = 1401
     }
+
+    /// Prefix for BitChat private-envelope ciphertext. The suffix is
+    /// base64url(nonce24 || ciphertext || poly1305Tag).
+    static let privateEnvelopeContentPrefix = "bitchat-pm-v1:"
+
+    /// Bound work before Base64 decoding either encrypted layer. Current
+    /// private messages are normally only a few KiB; 64 KiB leaves ample
+    /// migration headroom without allowing an addressed relay event to drive
+    /// unbounded allocation.
+    static let maximumPrivateEnvelopeCiphertextBytes = 64 * 1024
+
+    /// Bound the inner authenticated message JSON before allocation/parsing.
+    /// This is intentionally an envelope limit, not the generic composer
+    /// limit. Raising it alone would not make larger private-message packets
+    /// compatible with released readers; callers must surface a rejected
+    /// packet or envelope as a failed send.
+    static let maximumPrivateEnvelopePlaintextBytes = 32 * 1024
+
+    /// The outer authenticated seal JSON contains a Base64-encoded encrypted
+    /// copy of the inner JSON, so it needs expansion headroom of its own. Keep
+    /// the layer-specific cap below the public ciphertext ceiling.
+    private static let maximumPrivateEnvelopeSealPlaintextBytes = 48 * 1024
+
+    /// New clients subscribe to the provisional BitChat-specific kind and the
+    /// compatibility legacy kind so both sides of a rolling rollout can
+    /// recover stored messages. Do not remove kind 1059 here until all
+    /// supported iOS and Android releases have migrated.
+    static let acceptedPrivateEnvelopeKinds = [
+        EventKind.privateEnvelope.rawValue,
+        EventKind.legacyNIP59GiftWrap.rawValue
+    ]
+
+    private enum PrivateEnvelopeWireFormat {
+        case bitchatV1
+        case legacyMislabelledV2
+
+        init?(outerKind: Int) {
+            switch outerKind {
+            case EventKind.privateEnvelope.rawValue:
+                self = .bitchatV1
+            case EventKind.legacyNIP59GiftWrap.rawValue:
+                self = .legacyMislabelledV2
+            default:
+                return nil
+            }
+        }
+
+        var messageKind: EventKind {
+            switch self {
+            case .bitchatV1: .privateMessage
+            case .legacyMislabelledV2: .legacyNIP17DirectMessage
+            }
+        }
+
+        var sealKind: EventKind {
+            switch self {
+            case .bitchatV1: .privateSeal
+            case .legacyMislabelledV2: .legacyNIP59Seal
+            }
+        }
+
+        var envelopeKind: EventKind {
+            switch self {
+            case .bitchatV1: .privateEnvelope
+            case .legacyMislabelledV2: .legacyNIP59GiftWrap
+            }
+        }
+
+        var contentPrefix: String {
+            switch self {
+            case .bitchatV1: NostrProtocol.privateEnvelopeContentPrefix
+            case .legacyMislabelledV2: "v2:"
+            }
+        }
+
+        var hkdfSalt: Data {
+            switch self {
+            case .bitchatV1: Data("bitchat-private-envelope-v1".utf8)
+            case .legacyMislabelledV2: Data()
+            }
+        }
+
+        var hkdfInfo: Data {
+            switch self {
+            case .bitchatV1: Data()
+            case .legacyMislabelledV2: Data("nip44-v2".utf8)
+            }
+        }
+    }
     
-    /// Create a NIP-17 private message
-    static func createPrivateMessage(
+    /// Create a BitChat private envelope for relay transport.
+    static func createPrivateEnvelope(
         content: String,
         recipientPubkey: String,
         senderIdentity: NostrIdentity
     ) throws -> NostrEvent {
-        
-        // Creating private message
-        
-        // 1. Create the rumor (unsigned event)
-        let rumor = NostrEvent(
+        try createPrivateEnvelope(
+            content: content,
+            recipientPubkey: recipientPubkey,
+            senderIdentity: senderIdentity,
+            format: .bitchatV1
+        )
+    }
+
+    /// Events to publish for one logical private payload. The primary
+    /// BitChat-specific format is always first and a legacy copy follows for
+    /// clients that still subscribe only to kind 1059. There is deliberately
+    /// no date-based cutoff: removal requires a coordinated iOS/Android
+    /// release after supported old clients have migrated. Both encrypt the
+    /// exact same embedded BitChat payload, so receive-side logical-payload
+    /// dedup collapses the pair.
+    static func createPrivateEnvelopePublicationBatch(
+        content: String,
+        recipientPubkey: String,
+        senderIdentity: NostrIdentity
+    ) throws -> [NostrEvent] {
+        let primary = try createPrivateEnvelope(
+            content: content,
+            recipientPubkey: recipientPubkey,
+            senderIdentity: senderIdentity
+        )
+        let compatibilityCopy = try createPrivateEnvelope(
+            content: content,
+            recipientPubkey: recipientPubkey,
+            senderIdentity: senderIdentity,
+            format: .legacyMislabelledV2
+        )
+        return [primary, compatibilityCopy]
+    }
+
+    private static func createPrivateEnvelope(
+        content: String,
+        recipientPubkey: String,
+        senderIdentity: NostrIdentity,
+        format: PrivateEnvelopeWireFormat,
+        messageTags: [[String]] = []
+    ) throws -> NostrEvent {
+        // 1. Create the unsigned inner BitChat message.
+        let message = NostrEvent(
             pubkey: senderIdentity.publicKeyHex,
             createdAt: Date(),
-            kind: .dm, // NIP-17: DM rumor kind 14
-            tags: [],
+            kind: format.messageKind,
+            tags: messageTags,
             content: content
         )
         
-        // 2. Seal the rumor (encrypt to recipient) and sign it with the SENDER'S
-        //    real identity key. NIP-17 requires the seal be signed by the sender
-        //    so the recipient can authenticate who sent the message; signing with
-        //    a throwaway key leaves DMs forgeable/impersonatable.
+        // 2. Encrypt the message to the recipient and sign the private seal
+        // with the sender's stable Nostr identity for sender authentication.
         let senderKey = try senderIdentity.schnorrSigningKey()
-        let sealedEvent = try createSeal(
-            rumor: rumor,
+        let sealedEvent = try createPrivateSeal(
+            message: message,
             recipientPubkey: recipientPubkey,
-            senderKey: senderKey
+            senderKey: senderKey,
+            format: format
         )
 
-        // 3. Gift wrap the sealed event with a throwaway ephemeral key (the wrap
-        //    layer hides the sender's identity from relays; createGiftWrap mints
-        //    its own ephemeral key internally).
-        let giftWrap = try createGiftWrap(
+        // 3. Encrypt the seal under a one-time key so the public envelope does
+        // not reveal the stable sender identity.
+        return try createPrivateEnvelopeEvent(
             seal: sealedEvent,
-            recipientPubkey: recipientPubkey
+            recipientPubkey: recipientPubkey,
+            format: format
         )
-        
-        // Created gift wrap
-        
-        return giftWrap
     }
     
-    /// Decrypt a received NIP-17 message
-    /// Returns the content, sender pubkey, and the actual message timestamp (not the randomized gift wrap timestamp)
-    static func decryptPrivateMessage(
-        giftWrap: NostrEvent,
+    /// Decrypt a BitChat private envelope. Legacy proprietary envelopes that
+    /// older BitChat releases placed under kinds 1059/13/14 are accepted only
+    /// through the format-isolated receive path.
+    static func decryptPrivateEnvelope(
+        envelope: NostrEvent,
         recipientIdentity: NostrIdentity
     ) throws -> (content: String, senderPubkey: String, timestamp: Int) {
-        
-        // Starting decryption
-        
-        // 1. Unwrap the gift wrap
-        let seal: NostrEvent
-        do {
-            seal = try unwrapGiftWrap(
-                giftWrap: giftWrap,
-                recipientKey: recipientIdentity.schnorrSigningKey()
-            )
-            // Successfully unwrapped gift wrap
-        } catch {
-            SecureLogger.error("❌ Failed to unwrap gift wrap: \(error)", category: .session)
-            throw error
-        }
-        
-        // 2. Authenticate the seal. The seal MUST be signed by the sender's real
-        //    identity key (NIP-17); without this check a DM is forgeable by anyone
-        //    who knows the recipient's npub. Verify the seal's own signature.
-        guard seal.isValidSignature() else {
-            SecureLogger.error("❌ Rejecting DM: seal signature is missing or invalid", category: .session)
-            throw NostrError.invalidEvent
-        }
-
-        // 3. Open the seal
-        let rumor: NostrEvent
-        do {
-            rumor = try openSeal(
-                seal: seal,
-                recipientKey: recipientIdentity.schnorrSigningKey()
-            )
-            // Successfully opened seal
-        } catch {
-            SecureLogger.error("❌ Failed to open seal: \(error)", category: .session)
-            throw error
-        }
-
-        // 4. The sender claimed inside the rumor must match the key that actually
-        //    signed the seal, otherwise the sender field is unauthenticated and
-        //    spoofable.
-        guard seal.pubkey == rumor.pubkey else {
-            SecureLogger.error("❌ Rejecting DM: rumor pubkey does not match seal signer", category: .session)
-            throw NostrError.invalidEvent
-        }
-
-        // Return the seal signer's pubkey as the authenticated sender.
-        return (content: rumor.content, senderPubkey: seal.pubkey, timestamp: rumor.created_at)
+        let layers = try decodePrivateEnvelopeLayers(
+            envelope: envelope,
+            recipientIdentity: recipientIdentity
+        )
+        return (
+            content: layers.message.content,
+            senderPubkey: layers.seal.pubkey,
+            timestamp: layers.message.created_at
+        )
     }
 
     #if DEBUG
-    static func createPrivateMessageWithInvalidSealSignatureForTesting(
+    static func createPrivateEnvelopeWithInvalidSealSignatureForTesting(
         content: String,
         recipientPubkey: String,
         senderIdentity: NostrIdentity
     ) throws -> NostrEvent {
-        let rumor = NostrEvent(
+        let format = PrivateEnvelopeWireFormat.bitchatV1
+        let message = NostrEvent(
             pubkey: senderIdentity.publicKeyHex,
             createdAt: Date(),
-            kind: .dm,
+            kind: format.messageKind,
             tags: [],
             content: content
         )
-        var seal = try createSeal(
-            rumor: rumor,
+        var seal = try createPrivateSeal(
+            message: message,
             recipientPubkey: recipientPubkey,
-            senderKey: senderIdentity.schnorrSigningKey()
+            senderKey: senderIdentity.schnorrSigningKey(),
+            format: format
         )
         seal.sig = String(repeating: "0", count: 128)
-        return try createGiftWrap(seal: seal, recipientPubkey: recipientPubkey)
+        return try createPrivateEnvelopeEvent(
+            seal: seal,
+            recipientPubkey: recipientPubkey,
+            format: format
+        )
     }
 
-    static func createPrivateMessageWithMismatchedSealRumorPubkeyForTesting(
+    static func createPrivateEnvelopeWithMismatchedSealMessagePubkeyForTesting(
         content: String,
         recipientPubkey: String,
-        rumorIdentity: NostrIdentity,
+        messageIdentity: NostrIdentity,
         sealSignerIdentity: NostrIdentity
     ) throws -> NostrEvent {
-        let rumor = NostrEvent(
-            pubkey: rumorIdentity.publicKeyHex,
+        let format = PrivateEnvelopeWireFormat.bitchatV1
+        let message = NostrEvent(
+            pubkey: messageIdentity.publicKeyHex,
             createdAt: Date(),
-            kind: .dm,
+            kind: format.messageKind,
             tags: [],
             content: content
         )
-        let seal = try createSeal(
-            rumor: rumor,
+        let seal = try createPrivateSeal(
+            message: message,
             recipientPubkey: recipientPubkey,
-            senderKey: sealSignerIdentity.schnorrSigningKey()
+            senderKey: sealSignerIdentity.schnorrSigningKey(),
+            format: format
         )
-        return try createGiftWrap(seal: seal, recipientPubkey: recipientPubkey)
+        return try createPrivateEnvelopeEvent(
+            seal: seal,
+            recipientPubkey: recipientPubkey,
+            format: format
+        )
+    }
+
+    static func createPrivateEnvelopeWithInnerTagsForTesting(
+        content: String,
+        recipientPubkey: String,
+        senderIdentity: NostrIdentity,
+        innerMessageTags: [[String]]
+    ) throws -> NostrEvent {
+        try createPrivateEnvelope(
+            content: content,
+            recipientPubkey: recipientPubkey,
+            senderIdentity: senderIdentity,
+            format: .bitchatV1,
+            messageTags: innerMessageTags
+        )
+    }
+
+    static func createLegacyPrivateEnvelopeForTesting(
+        content: String,
+        recipientPubkey: String,
+        senderIdentity: NostrIdentity,
+        innerMessageTags: [[String]] = []
+    ) throws -> NostrEvent {
+        // Current Android legacy envelopes use exactly one recipient `p` tag
+        // on the unsigned inner kind-14 event; released iOS envelopes use no
+        // inner tags. Tests pass the Android shape explicitly so this helper
+        // cannot silently make the production encoder depend on that quirk.
+        try createPrivateEnvelope(
+            content: content,
+            recipientPubkey: recipientPubkey,
+            senderIdentity: senderIdentity,
+            format: .legacyMislabelledV2,
+            messageTags: innerMessageTags
+        )
+    }
+
+    static func decodePrivateEnvelopeLayersForTesting(
+        envelope: NostrEvent,
+        recipientIdentity: NostrIdentity
+    ) throws -> (seal: NostrEvent, message: NostrEvent) {
+        try decodePrivateEnvelopeLayers(
+            envelope: envelope,
+            recipientIdentity: recipientIdentity
+        )
+    }
+
+    static func decodePrivateEnvelopeEventJSONForTesting(_ json: String) throws -> NostrEvent {
+        try decodePrivateEnvelopeEventJSON(json)
     }
     #endif
 
@@ -400,151 +559,207 @@ struct NostrProtocol {
 
     // MARK: - Private Methods
     
-    private static func createSeal(
-        rumor: NostrEvent,
+    private static func createPrivateSeal(
+        message: NostrEvent,
         recipientPubkey: String,
-        senderKey: P256K.Schnorr.PrivateKey
+        senderKey: P256K.Schnorr.PrivateKey,
+        format: PrivateEnvelopeWireFormat
     ) throws -> NostrEvent {
-        
-        let rumorJSON = try rumor.jsonString()
         let encrypted = try encrypt(
-            plaintext: rumorJSON,
+            plaintext: message.jsonString(),
             recipientPubkey: recipientPubkey,
-            senderKey: senderKey
+            senderKey: senderKey,
+            format: format,
+            maximumPlaintextBytes: maximumPrivateEnvelopePlaintextBytes
         )
-        
+
         let seal = NostrEvent(
             pubkey: Data(senderKey.xonly.bytes).hexEncodedString(),
-            createdAt: randomizedTimestamp(),
-            kind: .seal,
+            createdAt: randomizedPastTimestamp(),
+            kind: format.sealKind,
             tags: [],
             content: encrypted
         )
-        
-        // Sign the seal with the sender's Schnorr private key
         return try seal.sign(with: senderKey)
     }
-    
-    private static func createGiftWrap(
-        seal: NostrEvent,
-        recipientPubkey: String
-    ) throws -> NostrEvent {
 
-        let sealJSON = try seal.jsonString()
-        
-        // Create new ephemeral key for gift wrap
-        let wrapKey = try P256K.Schnorr.PrivateKey()
-        // Creating gift wrap with ephemeral key
-        
-        // Encrypt the seal with the new ephemeral key (not the seal's key)
+    private static func createPrivateEnvelopeEvent(
+        seal: NostrEvent,
+        recipientPubkey: String,
+        format: PrivateEnvelopeWireFormat
+    ) throws -> NostrEvent {
+        // A fresh signing/encryption key for every public envelope keeps the
+        // stable sender identity inside ciphertext.
+        let envelopeKey = try P256K.Schnorr.PrivateKey()
         let encrypted = try encrypt(
-            plaintext: sealJSON,
+            plaintext: seal.jsonString(),
             recipientPubkey: recipientPubkey,
-            senderKey: wrapKey  // Use the gift wrap ephemeral key
+            senderKey: envelopeKey,
+            format: format,
+            maximumPlaintextBytes: maximumPrivateEnvelopeSealPlaintextBytes
         )
-        
-        let giftWrap = NostrEvent(
-            pubkey: Data(wrapKey.xonly.bytes).hexEncodedString(),
-            createdAt: randomizedTimestamp(),
-            kind: .giftWrap,
-            tags: [["p", recipientPubkey]], // Tag recipient
+
+        let envelope = NostrEvent(
+            pubkey: Data(envelopeKey.xonly.bytes).hexEncodedString(),
+            createdAt: randomizedPastTimestamp(),
+            kind: format.envelopeKind,
+            tags: [["p", recipientPubkey]],
             content: encrypted
         )
-        
-        // Sign the gift wrap with the wrap Schnorr private key
-        return try giftWrap.sign(with: wrapKey)
+        return try envelope.sign(with: envelopeKey)
     }
-    
-    private static func unwrapGiftWrap(
-        giftWrap: NostrEvent,
-        recipientKey: P256K.Schnorr.PrivateKey
-    ) throws -> NostrEvent {
-        
-        // Unwrapping gift wrap
-        
-        let decrypted = try decrypt(
-            ciphertext: giftWrap.content,
-            senderPubkey: giftWrap.pubkey,
-            recipientKey: recipientKey
-        )
-        
-        guard let data = decrypted.data(using: .utf8),
-              let sealDict = try JSONSerialization.jsonObject(with: data) as? [String: Any] else {
+
+    private static func decodePrivateEnvelopeLayers(
+        envelope: NostrEvent,
+        recipientIdentity: NostrIdentity
+    ) throws -> (seal: NostrEvent, message: NostrEvent) {
+        guard envelope.content.utf8.count <= maximumPrivateEnvelopeCiphertextBytes else {
+            throw NostrError.invalidCiphertext
+        }
+        guard let format = PrivateEnvelopeWireFormat(outerKind: envelope.kind),
+              envelope.tags == [["p", recipientIdentity.publicKeyHex]],
+              envelope.isValidSignature() else {
             throw NostrError.invalidEvent
         }
-        
-        let seal = try NostrEvent(from: sealDict)
-        // Unwrapped seal
-        
-        return seal
-    }
-    
-    private static func openSeal(
-        seal: NostrEvent,
-        recipientKey: P256K.Schnorr.PrivateKey
-    ) throws -> NostrEvent {
-        
-        let decrypted = try decrypt(
+
+        let recipientKey = try recipientIdentity.schnorrSigningKey()
+        let sealJSON = try decrypt(
+            ciphertext: envelope.content,
+            senderPubkey: envelope.pubkey,
+            recipientKey: recipientKey,
+            format: format,
+            maximumPlaintextBytes: maximumPrivateEnvelopeSealPlaintextBytes
+        )
+        let seal = try decodePrivateEnvelopeEventJSON(
+            sealJSON,
+            maximumBytes: maximumPrivateEnvelopeSealPlaintextBytes
+        )
+        guard seal.kind == format.sealKind.rawValue,
+              seal.tags.isEmpty,
+              seal.isValidSignature() else {
+            throw NostrError.invalidEvent
+        }
+
+        let messageJSON = try decrypt(
             ciphertext: seal.content,
             senderPubkey: seal.pubkey,
-            recipientKey: recipientKey
+            recipientKey: recipientKey,
+            format: format,
+            maximumPlaintextBytes: maximumPrivateEnvelopePlaintextBytes
         )
-        
-        guard let data = decrypted.data(using: .utf8),
-              let rumorDict = try JSONSerialization.jsonObject(with: data) as? [String: Any] else {
+        let message = try decodePrivateEnvelopeEventJSON(
+            messageJSON,
+            maximumBytes: maximumPrivateEnvelopePlaintextBytes
+        )
+
+        // The inner message is intentionally unsigned; sender authentication
+        // comes from the seal. Bind its claimed sender and custom kind to that
+        // authenticated layer before exposing content.
+        guard message.kind == format.messageKind.rawValue,
+              validInnerMessageTags(
+                message.tags,
+                format: format,
+                recipientPubkey: recipientIdentity.publicKeyHex
+              ),
+              message.sig == nil,
+              seal.pubkey == message.pubkey else {
             throw NostrError.invalidEvent
         }
-        
-        return try NostrEvent(from: rumorDict)
+
+        return (seal, message)
     }
-    
-    // MARK: - Encryption (NIP-44 v2)
-    
+
+    /// Released iOS legacy envelopes used no inner tags, while current
+    /// Android legacy envelopes use exactly the authenticated recipient tag.
+    /// Accept only those two historical shapes for kind 1059. The new kind
+    /// 1402 format remains strict and rejects every inner tag.
+    private static func validInnerMessageTags(
+        _ tags: [[String]],
+        format: PrivateEnvelopeWireFormat,
+        recipientPubkey: String
+    ) -> Bool {
+        switch format {
+        case .bitchatV1:
+            return tags.isEmpty
+        case .legacyMislabelledV2:
+            return tags.isEmpty || tags == [["p", recipientPubkey]]
+        }
+    }
+
+    private static func decodePrivateEnvelopeEventJSON(
+        _ json: String,
+        maximumBytes: Int = maximumPrivateEnvelopePlaintextBytes
+    ) throws -> NostrEvent {
+        // Check UTF-8 size before allocating Data or invoking the general JSON
+        // parser. `decrypt` enforces the same cap on authenticated bytes; this
+        // local guard keeps the parser boundary explicit and independently
+        // testable.
+        guard json.utf8.count <= maximumBytes else {
+            throw NostrError.invalidCiphertext
+        }
+        guard let data = json.data(using: .utf8),
+              let dictionary = try JSONSerialization.jsonObject(with: data) as? [String: Any] else {
+            throw NostrError.invalidEvent
+        }
+        return try NostrEvent(from: dictionary)
+    }
+
+    // MARK: - BitChat private-envelope encryption
+
     private static func encrypt(
         plaintext: String,
         recipientPubkey: String,
-        senderKey: P256K.Schnorr.PrivateKey
+        senderKey: P256K.Schnorr.PrivateKey,
+        format: PrivateEnvelopeWireFormat,
+        maximumPlaintextBytes: Int
     ) throws -> String {
-        
         guard let recipientPubkeyData = Data(hexString: recipientPubkey) else {
             throw NostrError.invalidPublicKey
         }
-        
-        // Encrypting message (NIP-44 v2: XChaCha20-Poly1305, versioned)
-        
-        // Derive shared secret
+
         let sharedSecret = try deriveSharedSecret(
             privateKey: senderKey,
             publicKey: recipientPubkeyData
         )
-        // Derive NIP-44 v2 symmetric key (HKDF-SHA256 with label in info)
-        let key = try deriveNIP44V2Key(from: sharedSecret)
-        
-        // 24-byte random nonce for XChaCha20-Poly1305
+        let key = derivePrivateEnvelopeKey(from: sharedSecret, format: format)
+
         var nonce24 = Data(count: 24)
-        _ = nonce24.withUnsafeMutableBytes { ptr in
+        let randomStatus = nonce24.withUnsafeMutableBytes { ptr in
             SecRandomCopyBytes(kSecRandomDefault, 24, ptr.baseAddress!)
         }
-        
-        let pt = Data(plaintext.utf8)
-        let sealed = try XChaCha20Poly1305Compat.seal(plaintext: pt, key: key, nonce24: nonce24)
-        
-        // v2: base64url(nonce24 || ciphertext || tag)
+        guard randomStatus == errSecSuccess else {
+            throw NostrError.cryptographicFailure
+        }
+
+        let plaintextData = Data(plaintext.utf8)
+        guard plaintextData.count <= maximumPlaintextBytes else {
+            throw NostrError.invalidCiphertext
+        }
+        let sealed = try XChaCha20Poly1305Compat.seal(
+            plaintext: plaintextData,
+            key: key,
+            nonce24: nonce24
+        )
+
         var combined = Data()
         combined.append(nonce24)
         combined.append(sealed.ciphertext)
         combined.append(sealed.tag)
-        return "v2:" + Base64URLCoding.encode(combined)
+        return format.contentPrefix + Base64URLCoding.encode(combined)
     }
-    
+
     private static func decrypt(
         ciphertext: String,
         senderPubkey: String,
-        recipientKey: P256K.Schnorr.PrivateKey
+        recipientKey: P256K.Schnorr.PrivateKey,
+        format: PrivateEnvelopeWireFormat,
+        maximumPlaintextBytes: Int
     ) throws -> String {
-        // Expect NIP-44 v2 format
-        guard ciphertext.hasPrefix("v2:") else { throw NostrError.invalidCiphertext }
-        let encoded = String(ciphertext.dropFirst(3))
+        guard ciphertext.utf8.count <= maximumPrivateEnvelopeCiphertextBytes,
+              ciphertext.hasPrefix(format.contentPrefix) else {
+            throw NostrError.invalidCiphertext
+        }
+        let encoded = String(ciphertext.dropFirst(format.contentPrefix.count))
         guard let data = Base64URLCoding.decode(encoded),
               data.count > (24 + 16),
               let senderPubkeyData = Data(hexString: senderPubkey) else {
@@ -554,33 +769,40 @@ struct NostrProtocol {
         let nonce24 = data.prefix(24)
         let rest = data.dropFirst(24)
         let tag = rest.suffix(16)
-        let ct = rest.dropLast(16)
+        let ciphertextBytes = rest.dropLast(16)
 
-        // Try decryption with even-Y then odd-Y when sender pubkey is x-only
-        func attemptDecrypt(using pubKeyData: Data) throws -> Data {
-            let ss = try deriveSharedSecret(privateKey: recipientKey, publicKey: pubKeyData)
-            let key = try deriveNIP44V2Key(from: ss)
+        func attemptDecrypt(using publicKeyData: Data) throws -> Data {
+            let sharedSecret = try deriveSharedSecret(
+                privateKey: recipientKey,
+                publicKey: publicKeyData
+            )
+            let key = derivePrivateEnvelopeKey(from: sharedSecret, format: format)
             return try XChaCha20Poly1305Compat.open(
-                ciphertext: Data(ct),
+                ciphertext: Data(ciphertextBytes),
                 tag: Data(tag),
                 key: key,
                 nonce24: Data(nonce24)
             )
         }
 
-        // If 32 bytes (x-only) try both parities, otherwise single try
+        let plaintext: Data
         if senderPubkeyData.count == 32 {
-            let even = Data([0x02]) + senderPubkeyData
-            if let pt = try? attemptDecrypt(using: even) {
-                return String(data: pt, encoding: .utf8) ?? ""
+            let evenKey = Data([0x02]) + senderPubkeyData
+            if let opened = try? attemptDecrypt(using: evenKey) {
+                plaintext = opened
+            } else {
+                let oddKey = Data([0x03]) + senderPubkeyData
+                plaintext = try attemptDecrypt(using: oddKey)
             }
-            let odd = Data([0x03]) + senderPubkeyData
-            let pt = try attemptDecrypt(using: odd)
-            return String(data: pt, encoding: .utf8) ?? ""
         } else {
-            let pt = try attemptDecrypt(using: senderPubkeyData)
-            return String(data: pt, encoding: .utf8) ?? ""
+            plaintext = try attemptDecrypt(using: senderPubkeyData)
         }
+
+        guard plaintext.count <= maximumPlaintextBytes,
+              let decoded = String(data: plaintext, encoding: .utf8) else {
+            throw NostrError.invalidCiphertext
+        }
+        return decoded
     }
     
     private static func deriveSharedSecret(
@@ -640,29 +862,17 @@ struct NostrProtocol {
         let sharedSecretData = sharedSecret.withUnsafeBytes { Data($0) }
         // ECDH shared secret derived
         
-        // Return raw ECDH shared secret; HKDF is applied by deriveNIP44V2Key
+        // Return raw ECDH shared secret; the wire-format-specific HKDF is
+        // applied by derivePrivateEnvelopeKey.
         return sharedSecretData
     }
     
-    private static func randomizedTimestamp() -> Date {
-        // Add random offset to current time for privacy
-        // This prevents timing correlation attacks while the actual message timestamp
-        // is preserved in the encrypted rumor
-        let offset = TimeInterval.random(in: -900...900) // +/- 15 minutes
-        let now = Date()
-        let randomized = now.addingTimeInterval(offset)
-        
-        // Log with explicit UTC and local time for debugging
-        let formatter = DateFormatter()
-        //
-        formatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
-        formatter.timeZone = TimeZone(abbreviation: "UTC")
-        
-        formatter.timeZone = TimeZone.current
-        
-        // Timestamp randomized for privacy
-        
-        return randomized
+    private static func randomizedPastTimestamp() -> Date {
+        // Keep public timestamps in the past: future-dated events are rejected
+        // by some relays. The actual message timestamp remains encrypted.
+        Date().addingTimeInterval(
+            -TimeInterval.random(in: 0...TransportConfig.nostrPrivateEnvelopeTimestampFuzzSeconds)
+        )
     }
 }
 
@@ -794,16 +1004,20 @@ enum NostrError: Error {
     case invalidPublicKey
     case invalidEvent
     case invalidCiphertext
+    case cryptographicFailure
 }
 
-// MARK: - NIP-44 v2 helpers (XChaCha20-Poly1305)
+// MARK: - BitChat private-envelope key derivation
 
 private extension NostrProtocol {
-    static func deriveNIP44V2Key(from sharedSecretData: Data) throws -> Data {
+    private static func derivePrivateEnvelopeKey(
+        from sharedSecretData: Data,
+        format: PrivateEnvelopeWireFormat
+    ) -> Data {
         let derivedKey = HKDF<CryptoKit.SHA256>.deriveKey(
             inputKeyMaterial: SymmetricKey(data: sharedSecretData),
-            salt: Data(),
-            info: Data("nip44-v2".utf8),
+            salt: format.hkdfSalt,
+            info: format.hkdfInfo,
             outputByteCount: 32
         )
         return derivedKey.withUnsafeBytes { Data($0) }

bitchat/Services/BLE/BLEFileTransferHandler.swift

@@ -40,6 +40,9 @@ struct BLEFileTransferHandlerEnvironment {
     let commitPrivateMediaFile: (_ messageID: String, _ storedURL: URL) -> Bool
     /// Rolls back a saved payload when its durable receipt commit fails.
     let removeIncomingFile: (_ storedURL: URL) -> Void
+    /// Releases the allocator's save-to-UI ownership guard after synchronous
+    /// conversation insertion has completed.
+    let finishIncomingFileDelivery: (_ storedURL: URL) -> Void
     /// Checks the authenticated sender before any private-media disk work.
     let isPrivateMediaSenderBlocked: (PeerID) -> Bool
     /// Updates the registry last-seen timestamp for the peer (async barrier write).
@@ -49,11 +52,14 @@ struct BLEFileTransferHandlerEnvironment {
     let acknowledgePrivateMedia: (_ messageID: String, _ peerID: PeerID) -> Void
     /// Delivers `.messageReceived` as one main-actor hop while
     /// `shouldDeliver` remains true before and after the synchronous sink.
-    /// The completion authorizes the stable-media ACK.
+    /// The completion authorizes the stable-media ACK. Finalization runs after
+    /// every delivery attempt, including rejection, so allocator ownership
+    /// cannot leak indefinitely.
     let deliverMessage: (
         _ message: BitchatMessage,
         _ shouldDeliver: @escaping () -> Bool,
-        _ completion: @escaping () -> Void
+        _ completion: @escaping () -> Void,
+        _ finalization: @escaping (TransportEventDeliveryOutcome) -> Void
     ) -> Void
 }
 
@@ -357,7 +363,24 @@ final class BLEFileTransferHandler {
                 env: env
             )
         } else {
-            env.deliverMessage(message, { true }, {})
+            env.deliverMessage(
+                message,
+                { true },
+                {},
+                { outcome in
+                    if outcome == .rejected {
+                        // Raw media has no durable receipt that can redeliver
+                        // it later. Do not leave a newly saved, UI-unowned file
+                        // available for a stale fallback path to misidentify.
+                        env.removeIncomingFile(destination)
+                    } else {
+                        // Plain delegates are invoked without synchronous
+                        // insertion confirmation. Preserve the payload for
+                        // that supported delivery path.
+                        env.finishIncomingFileDelivery(destination)
+                    }
+                }
+            )
         }
         return true
     }
@@ -381,6 +404,9 @@ final class BLEFileTransferHandler {
             },
             {
                 env.acknowledgePrivateMedia(messageID, peerID)
+            },
+            { _ in
+                env.finishIncomingFileDelivery(expectedURL)
             }
         )
     }

bitchat/Services/BLE/BLEIncomingFileStore.swift

@@ -93,7 +93,7 @@ struct PanicRecoveryOperations {
     }
 }
 
-struct BLEIncomingFileStore {
+struct BLEIncomingFileStore: @unchecked Sendable {
     enum PanicRecoveryError: Error {
         case externalMarkerCommitFailed
         case markerWriteFailed(Error)
@@ -103,7 +103,17 @@ struct BLEIncomingFileStore {
         )
     }
 
-    private static let quotaBytes: Int64 = 100 * 1024 * 1024
+    struct PrivateMediaDeletionReservation: Sendable {
+        fileprivate let id: UUID
+    }
+
+    private final class PayloadCoordination: @unchecked Sendable {
+        let lock = NSLock()
+        var pendingDeliveryPaths: Set<String> = []
+        var deletionReservations: [UUID: Set<String>] = [:]
+    }
+
+    private static let defaultQuotaBytes: Int64 = 100 * 1024 * 1024
     /// Kept outside `files/` so deleting the media tree cannot erase the
     /// fail-closed startup decision before the full panic has committed.
     private static let panicRecoveryPendingMarkerFileName =
@@ -120,7 +130,6 @@ struct BLEIncomingFileStore {
         "files/incoming",
         "files/outgoing"
     ]
-
     /// Name prefix of in-flight live voice captures (progressively written by
     /// `ChatLiveVoiceCoordinator`). Quota eviction skips them by pattern —
     /// deleting one mid-stream unlinks the inode under an open `FileHandle`
@@ -134,7 +143,9 @@ struct BLEIncomingFileStore {
     private let baseDirectory: URL?
     private let dateProvider: () -> Date
     private let panicMarkerWriter: (Data, URL) throws -> Void
+    private let quotaBytes: Int64
     private let privateMediaReceipts: BLEPrivateMediaReceiptStore
+    private let payloadCoordination: PayloadCoordination
 
     init(
         fileManager: FileManager = .default,
@@ -142,17 +153,20 @@ struct BLEIncomingFileStore {
         dateProvider: @escaping () -> Date = Date.init,
         panicMarkerWriter: @escaping (Data, URL) throws -> Void = {
             try $0.write(to: $1, options: .atomic)
-        }
+        },
+        quotaBytes: Int64 = Self.defaultQuotaBytes
     ) {
         self.fileManager = fileManager
         self.baseDirectory = baseDirectory
         self.dateProvider = dateProvider
         self.panicMarkerWriter = panicMarkerWriter
+        self.quotaBytes = max(0, quotaBytes)
         self.privateMediaReceipts = BLEPrivateMediaReceiptStore(
             fileManager: fileManager,
             baseDirectory: baseDirectory,
             now: dateProvider
         )
+        self.payloadCoordination = PayloadCoordination()
     }
 
     /// Panic-wipe every managed incoming and outgoing media artifact before
@@ -165,10 +179,21 @@ struct BLEIncomingFileStore {
     func panicWipe(
         hasDurablePendingMarker: Bool = false
     ) throws {
-        // The receipt index caches tombstones as well as accepted payloads.
-        // Always invalidate it on return, including partial-failure paths, so
-        // no pre-panic receiver decision survives after identity reset.
-        defer { privateMediaReceipts.resetForPanic() }
+        // The receipt index caches tombstones as well as accepted payloads,
+        // while payload coordination retains save/delete reservations. Always
+        // invalidate both on return, including partial-failure paths, so no
+        // pre-panic receiver decision survives after identity reset.
+        defer {
+            privateMediaReceipts.resetForPanic()
+            payloadCoordination.lock.lock()
+            payloadCoordination.pendingDeliveryPaths.removeAll(
+                keepingCapacity: false
+            )
+            payloadCoordination.deletionReservations.removeAll(
+                keepingCapacity: false
+            )
+            payloadCoordination.lock.unlock()
+        }
 
         let markerError: Error?
         do {
@@ -251,6 +276,9 @@ struct BLEIncomingFileStore {
         fallbackExtension: String?,
         defaultPrefix: String
     ) -> URL? {
+        payloadCoordination.lock.lock()
+        defer { payloadCoordination.lock.unlock() }
+
         do {
             let base = try filesDirectory().appendingPathComponent(subdirectory, isDirectory: true)
             try fileManager.createDirectory(at: base, withIntermediateDirectories: true, attributes: nil)
@@ -259,8 +287,26 @@ struct BLEIncomingFileStore {
                 defaultName: "\(defaultPrefix)_\(Self.timestampString(from: dateProvider()))",
                 fallbackExtension: fallbackExtension
             )
-            let destination = uniqueFileURL(in: base, fileName: sanitized)
+            let reservedPaths = privateMediaReceipts.reservedPayloadPaths()
+            let deletionPaths = payloadCoordination
+                .deletionReservations.values.reduce(into: Set<String>()) {
+                    $0.formUnion($1)
+                }
+            let allocationReservations = deletionPaths.union(
+                payloadCoordination.pendingDeliveryPaths
+            )
+            let destination = uniqueFileURL(
+                in: base,
+                fileName: sanitized,
+                reservedPaths: (reservedPaths ?? []).union(
+                    allocationReservations
+                ),
+                forceRandomizedName: reservedPaths == nil
+            )
             try data.write(to: destination, options: .atomic)
+            payloadCoordination.pendingDeliveryPaths.insert(
+                destination.standardizedFileURL.path
+            )
             return destination
         } catch {
             SecureLogger.error("❌ Failed to persist incoming media: \(error)", category: .session)
@@ -284,8 +330,75 @@ struct BLEIncomingFileStore {
         )
     }
 
+    /// Reserves every receipt/UI path before the asynchronous deletion
+    /// barrier. Allocation and reservation share one lock, so either an
+    /// in-flight raw arrival is observed and deletion fails closed, or the
+    /// arrival is forced onto a different filename.
+    func reservePrivateMediaDeletion(
+        messageIDs: [String],
+        payloadRelativePaths: [String: String]
+    ) -> PrivateMediaDeletionReservation? {
+        payloadCoordination.lock.lock()
+        defer { payloadCoordination.lock.unlock() }
+
+        guard let paths = privateMediaReceipts
+            .prospectiveDeletionPayloadPaths(
+                messageIDs: messageIDs,
+                payloadRelativePaths: payloadRelativePaths
+            ),
+        paths.isDisjoint(
+            with: payloadCoordination.pendingDeliveryPaths
+        ) else {
+            return nil
+        }
+
+        let reservation = PrivateMediaDeletionReservation(id: UUID())
+        payloadCoordination.deletionReservations[reservation.id] = paths
+        return reservation
+    }
+
+    func commitPrivateMediaDeletion(
+        reservation: PrivateMediaDeletionReservation,
+        messageIDs: [String],
+        payloadRelativePaths: [String: String],
+        protectedPayloadRelativePaths: Set<String>
+    ) -> Bool {
+        payloadCoordination.lock.lock()
+        defer {
+            payloadCoordination.deletionReservations.removeValue(
+                forKey: reservation.id
+            )
+            payloadCoordination.lock.unlock()
+        }
+        guard payloadCoordination.deletionReservations[reservation.id] != nil
+        else {
+            return false
+        }
+        return privateMediaReceipts.recordDeleted(
+            messageIDs: messageIDs,
+            payloadRelativePaths: payloadRelativePaths,
+            protectedPayloadRelativePaths: protectedPayloadRelativePaths
+        )
+    }
+
+    /// Releases the short window between disk save and synchronous
+    /// conversation insertion. Before this callback, a deletion transaction
+    /// may not infer ownership from a stale bubble that names the same path.
+    func finishIncomingFileDelivery(at storedURL: URL) {
+        payloadCoordination.lock.lock()
+        defer { payloadCoordination.lock.unlock() }
+        payloadCoordination.pendingDeliveryPaths.remove(
+            storedURL.standardizedFileURL.path
+        )
+    }
+
     /// Best-effort rollback for a payload whose durable receipt commit failed.
     func removeIncomingFile(at storedURL: URL) {
+        payloadCoordination.lock.lock()
+        defer { payloadCoordination.lock.unlock() }
+        payloadCoordination.pendingDeliveryPaths.remove(
+            storedURL.standardizedFileURL.path
+        )
         guard isURLInsideFilesDirectory(storedURL) else { return }
         do {
             try fileManager.removeItem(at: storedURL)
@@ -303,6 +416,9 @@ struct BLEIncomingFileStore {
     /// a finalized transfer can arrive at quota while a burst is still
     /// streaming — but they still count toward usage.
     func enforceQuota(reservingBytes: Int) {
+        payloadCoordination.lock.lock()
+        defer { payloadCoordination.lock.unlock() }
+
         do {
             let base = try filesDirectory()
             let incomingDirs = [
@@ -328,14 +444,26 @@ struct BLEIncomingFileStore {
             }
 
             let currentUsage = allFiles.reduce(0) { $0 + $1.size }
-            let targetUsage = Self.quotaBytes - Int64(reservingBytes)
+            let targetUsage = quotaBytes - Int64(reservingBytes)
             guard currentUsage > targetUsage else { return }
 
             let needToFree = currentUsage - targetUsage
+            let activeDeletionPaths = payloadCoordination
+                .deletionReservations.values.reduce(into: Set<String>()) {
+                    $0.formUnion($1)
+                }
+            let protectedPaths = activeDeletionPaths.union(
+                payloadCoordination.pendingDeliveryPaths
+            )
             var freedSpace: Int64 = 0
             for file in allFiles.sorted(by: { $0.modified < $1.modified }) {
                 guard freedSpace < needToFree else { break }
                 guard !file.url.lastPathComponent.hasPrefix(Self.liveCapturePrefix) else { continue }
+                guard !protectedPaths.contains(
+                    file.url.standardizedFileURL.path
+                ) else {
+                    continue
+                }
                 do {
                     try fileManager.removeItem(at: file.url)
                     freedSpace += file.size
@@ -423,11 +551,20 @@ struct BLEIncomingFileStore {
         return candidate.isEmpty ? defaultName : candidate
     }
 
-    private func uniqueFileURL(in directory: URL, fileName: String) -> URL {
+    private func uniqueFileURL(
+        in directory: URL,
+        fileName: String,
+        reservedPaths: Set<String>,
+        forceRandomizedName: Bool
+    ) -> URL {
         let directoryPath = directory.standardizedFileURL.path
         func isInsideDirectory(_ url: URL) -> Bool {
             url.standardizedFileURL.path.hasPrefix(directoryPath + "/")
         }
+        func isAvailable(_ url: URL) -> Bool {
+            !reservedPaths.contains(url.standardizedFileURL.path)
+                && !fileManager.fileExists(atPath: url.path)
+        }
 
         var candidate = directory.appendingPathComponent(fileName)
         guard isInsideDirectory(candidate) else {
@@ -435,19 +572,27 @@ struct BLEIncomingFileStore {
             return directory.appendingPathComponent("blocked_\(UUID().uuidString)")
         }
 
-        if !fileManager.fileExists(atPath: candidate.path) {
+        let baseName = (fileName as NSString).deletingPathExtension
+        let ext = (fileName as NSString).pathExtension
+        if forceRandomizedName {
+            let suffix = UUID().uuidString
+            let randomizedName = ext.isEmpty
+                ? "\(baseName)_\(suffix)"
+                : "\(baseName)_\(suffix).\(ext)"
+            return directory.appendingPathComponent(randomizedName)
+        }
+
+        if isAvailable(candidate) {
             return candidate
         }
 
-        let baseName = (fileName as NSString).deletingPathExtension
-        let ext = (fileName as NSString).pathExtension
         for counter in 1..<100 {
             let newName = ext.isEmpty ? "\(baseName) (\(counter))" : "\(baseName) (\(counter)).\(ext)"
             candidate = directory.appendingPathComponent(newName)
             guard isInsideDirectory(candidate) else {
                 return directory.appendingPathComponent("blocked_\(UUID().uuidString)")
             }
-            if !fileManager.fileExists(atPath: candidate.path) {
+            if isAvailable(candidate) {
                 return candidate
             }
         }

bitchat/Services/BLE/BLEPrivateMediaReceiptStore.swift

@@ -23,7 +23,15 @@ enum BLEPrivateMediaReceiptState: Equatable {
 final class BLEPrivateMediaReceiptStore: @unchecked Sendable {
     typealias DirectoryReader = (_ directory: URL) throws -> [URL]
     typealias DataReader = (_ url: URL) throws -> Data
+    typealias DataWriter = (
+        _ data: Data,
+        _ url: URL,
+        _ options: Data.WritingOptions
+    ) throws -> Void
+    typealias PayloadRemover = (_ url: URL) throws -> Void
     private static let receiptDirectoryName = ".private-media-receipts"
+    private static let deletionJournalFileName = ".deletion-journal.json"
+    private static let maximumDeletionPathsPerMessage = 2
 
     private struct ReceiptRecord: Codable, Equatable {
         enum Kind: String, Codable {
@@ -38,10 +46,23 @@ final class BLEPrivateMediaReceiptStore: @unchecked Sendable {
         let recordedAt: Date
     }
 
+    /// One atomic write of this journal is the commit point for an entire
+    /// explicit-deletion batch. Per-ID records and payload unlinks are
+    /// idempotent materialization performed only after that commit.
+    private struct DeletionJournalEntry: Codable, Equatable {
+        let relativePaths: [String]
+        let recordedAt: Date
+    }
+
+    private struct DeletionJournal: Codable {
+        let version: Int
+        let entries: [String: DeletionJournalEntry]
+    }
+
     private final class Runtime: @unchecked Sendable {
         let lock = NSLock()
         var records: [String: ReceiptRecord]?
-        var volatileTombstones: [String: Date] = [:]
+        var deletionJournal: [String: DeletionJournalEntry]?
     }
 
     private let fileManager: FileManager
@@ -51,6 +72,8 @@ final class BLEPrivateMediaReceiptStore: @unchecked Sendable {
     private let now: () -> Date
     private let directoryReader: DirectoryReader?
     private let dataReader: DataReader?
+    private let dataWriter: DataWriter
+    private let payloadRemover: PayloadRemover
     private let runtime = Runtime()
 
     init(
@@ -60,7 +83,11 @@ final class BLEPrivateMediaReceiptStore: @unchecked Sendable {
         ttl: TimeInterval = TransportConfig.privateMediaReceivedLedgerTTLSeconds,
         now: @escaping () -> Date = Date.init,
         directoryReader: DirectoryReader? = nil,
-        dataReader: DataReader? = nil
+        dataReader: DataReader? = nil,
+        dataWriter: @escaping DataWriter = {
+            try $0.write(to: $1, options: $2)
+        },
+        payloadRemover: PayloadRemover? = nil
     ) {
         self.fileManager = fileManager
         self.baseDirectory = baseDirectory
@@ -69,6 +96,10 @@ final class BLEPrivateMediaReceiptStore: @unchecked Sendable {
         self.now = now
         self.directoryReader = directoryReader
         self.dataReader = dataReader
+        self.dataWriter = dataWriter
+        self.payloadRemover = payloadRemover ?? {
+            try fileManager.removeItem(at: $0)
+        }
     }
 
     /// Drops process-lifetime decisions after the enclosing media directory
@@ -78,7 +109,7 @@ final class BLEPrivateMediaReceiptStore: @unchecked Sendable {
     func resetForPanic() {
         runtime.lock.lock()
         runtime.records = nil
-        runtime.volatileTombstones.removeAll(keepingCapacity: false)
+        runtime.deletionJournal = nil
         runtime.lock.unlock()
     }
 
@@ -91,29 +122,52 @@ final class BLEPrivateMediaReceiptStore: @unchecked Sendable {
         defer { runtime.lock.unlock() }
 
         let date = now()
-        if let tombstonedAt = runtime.volatileTombstones[messageID] {
-            if !isExpired(tombstonedAt, at: date) {
-                return .tombstoned
-            }
-            runtime.volatileTombstones.removeValue(forKey: messageID)
-        }
-
         guard let directory = resolvedReceiptDirectory(),
-              var records = loadIndexIfNeeded(from: directory, at: date) else {
+              loadDurableStateIfNeeded(from: directory, at: date) else {
             return .unavailable
         }
-        guard let record = records[messageID] else { return .absent }
+        _ = recoverDeletionJournal(in: directory)
+        if runtime.deletionJournal?[messageID] != nil {
+            return .tombstoned
+        }
+        guard var records = runtime.records else { return .unavailable }
+        guard var record = records[messageID] else { return .absent }
 
-        if isExpired(record.recordedAt, at: date) {
+        if record.kind == .tombstone, record.relativePath != nil {
+            guard scrubLegacyTombstone(
+                record,
+                messageID: messageID,
+                in: directory,
+                records: &records
+            ) else {
+                return .tombstoned
+            }
+            guard let scrubbed = records[messageID] else {
+                return .unavailable
+            }
+            record = scrubbed
+        }
+
+        let retainsAcceptedPath =
+            record.kind == .accepted
+                && record.relativePath.flatMap(existingPayload) != nil
+        if isExpired(record.recordedAt, at: date),
+           !retainsAcceptedPath {
+            guard removeRecord(
+                messageID: messageID,
+                from: directory
+            ) else {
+                return record.kind == .tombstone
+                    ? .tombstoned
+                    : .unavailable
+            }
             records.removeValue(forKey: messageID)
             runtime.records = records
-            removeRecord(messageID: messageID, from: directory)
             return .absent
         }
 
         switch record.kind {
         case .tombstone:
-            removePayloadRecordedByTombstone(record)
             return .tombstoned
 
         case .accepted:
@@ -121,9 +175,14 @@ final class BLEPrivateMediaReceiptStore: @unchecked Sendable {
                   let existingURL = existingPayload(relativePath: relativePath) else {
                 // Quota cleanup is not explicit deletion. Remove the stale
                 // receipt so a sender retry can restore the payload and bubble.
+                guard removeRecord(
+                    messageID: messageID,
+                    from: directory
+                ) else {
+                    return .unavailable
+                }
                 records.removeValue(forKey: messageID)
                 runtime.records = records
-                removeRecord(messageID: messageID, from: directory)
                 return .absent
             }
             return .accepted(existingURL)
@@ -144,13 +203,24 @@ final class BLEPrivateMediaReceiptStore: @unchecked Sendable {
         defer { runtime.lock.unlock() }
 
         let date = now()
-        if let tombstonedAt = runtime.volatileTombstones[messageID],
-           !isExpired(tombstonedAt, at: date) {
+        guard let directory = resolvedReceiptDirectory(),
+              loadDurableStateIfNeeded(from: directory, at: date) else {
             return false
         }
-
-        guard let directory = resolvedReceiptDirectory(),
-              var records = loadIndexIfNeeded(from: directory, at: date) else {
+        _ = recoverDeletionJournal(in: directory)
+        guard runtime.deletionJournal?[messageID] == nil,
+              var records = runtime.records else {
+            return false
+        }
+        if runtime.deletionJournal?.values.contains(where: {
+            $0.relativePaths.contains(relativePath)
+        }) == true {
+            return false
+        }
+        if records.contains(where: { existingMessageID, record in
+            existingMessageID != messageID
+                && record.relativePath == relativePath
+        }) {
             return false
         }
         if let existing = records[messageID],
@@ -188,73 +258,232 @@ final class BLEPrivateMediaReceiptStore: @unchecked Sendable {
         return true
     }
 
-    /// Foundation for explicit media deletion. This branch does not wire the
-    /// chat-clear UI; it only makes a tombstone durable and fail closed.
-    func recordDeleted(messageID: String) -> Bool {
-        guard PrivateMediaMessageIdentity.isStableID(messageID) else {
-            return false
-        }
+    /// Atomically commits explicit deletion for every stable ID in `messageIDs`.
+    ///
+    /// The journal is the single batch commit point: a failed write changes
+    /// neither durable nor in-memory receiver state, so callers must preserve
+    /// their bubbles. Once the write succeeds, every entry is tombstoned even
+    /// if the process exits before per-ID materialization or payload unlink.
+    /// Recovery retries both operations on the next lookup or launch.
+    func recordDeleted(
+        messageIDs: [String],
+        payloadRelativePaths: [String: String] = [:],
+        protectedPayloadRelativePaths: Set<String> = []
+    ) -> Bool {
+        let stableIDs = Array(
+            Set(messageIDs.filter(PrivateMediaMessageIdentity.isStableID))
+        ).sorted()
+        guard !stableIDs.isEmpty else { return true }
+        guard stableIDs.count <= capacity else { return false }
 
         runtime.lock.lock()
         defer { runtime.lock.unlock() }
 
         let date = now()
-        addVolatileTombstone(messageID, at: date)
-
         guard let directory = resolvedReceiptDirectory(),
-              var records = loadIndexIfNeeded(from: directory, at: date) else {
-            runtime.volatileTombstones.removeValue(forKey: messageID)
+              loadDurableStateIfNeeded(from: directory, at: date) else {
             return false
         }
-        if let existing = records[messageID],
-           existing.kind == .tombstone,
-           !isExpired(existing.recordedAt, at: date) {
-            runtime.volatileTombstones.removeValue(forKey: messageID)
-            removePayloadRecordedByTombstone(existing)
+        _ = recoverDeletionJournal(in: directory)
+        guard let records = runtime.records,
+              var journal = runtime.deletionJournal else {
+            return false
+        }
+
+        let pendingIDs = Set(journal.keys)
+        let newIDs = stableIDs.filter { messageID in
+            if pendingIDs.contains(messageID) { return false }
+            if let current = records[messageID],
+               current.kind == .tombstone,
+               !isExpired(current.recordedAt, at: date) {
+                return false
+            }
             return true
         }
-
-        let victim = capacityVictim(
-            for: .tombstone,
-            replacing: messageID,
-            in: records
-        )
-        if records[messageID]?.kind != .tombstone,
-           records.values.lazy.filter({ $0.kind == .tombstone }).count >= capacity,
-           victim == nil {
-            runtime.volatileTombstones.removeValue(forKey: messageID)
+        guard !newIDs.isEmpty else {
+            return true
+        }
+        guard Set(journal.keys).union(newIDs).count <= capacity else {
             return false
         }
 
-        let tombstone = ReceiptRecord(
-            kind: .tombstone,
-            // Retain the accepted path so a crash between the atomic record
-            // write and payload unlink can finish cleanup after relaunch.
-            relativePath: records[messageID]?.relativePath,
-            recordedAt: date
-        )
-        guard persist(tombstone, messageID: messageID, to: directory) else {
-            runtime.volatileTombstones.removeValue(forKey: messageID)
+        var newEntries: [String: DeletionJournalEntry] = [:]
+        for messageID in newIDs {
+            // Accepted receipts normally supply the exact stored path. The UI
+            // fallback is required when that receipt aged or was capacity
+            // evicted while its bubble and payload remain. They may differ
+            // after a retry selected a suffixed filename, so journal both.
+            // Never commit a new pathless tombstone: it could retire
+            // successfully while leaving an untracked payload behind.
+            let relativePaths = Array(Set([
+                records[messageID]?.relativePath,
+                payloadRelativePaths[messageID]
+            ].compactMap { $0 })).sorted()
+            guard !relativePaths.isEmpty,
+                  relativePaths.count <=
+                    Self.maximumDeletionPathsPerMessage,
+                  relativePaths.allSatisfy({
+                      isSafeDeletionTarget(relativePath: $0)
+                  }),
+                  protectedPayloadRelativePaths.isDisjoint(
+                      with: relativePaths
+                  ),
+                  !records.contains(where: { otherMessageID, record in
+                      otherMessageID != messageID
+                          && !stableIDs.contains(otherMessageID)
+                          && record.relativePath.map(
+                              relativePaths.contains
+                          ) == true
+                  }),
+                  !journal.contains(where: { otherMessageID, entry in
+                      otherMessageID != messageID
+                          && !stableIDs.contains(otherMessageID)
+                          && !Set(entry.relativePaths).isDisjoint(
+                              with: relativePaths
+                          )
+                  }) else {
+                return false
+            }
+            newEntries[messageID] = DeletionJournalEntry(
+                // The journal retains every owned path so payload deletion
+                // remains recoverable across a crash or unlink failure.
+                relativePaths: relativePaths,
+                recordedAt: date
+            )
+        }
+        journal.merge(newEntries) { _, new in new }
+
+        // Do not install any process-local tombstone before this succeeds.
+        // A failed delete must continue to resolve to its prior accepted
+        // state, otherwise a retry could be falsely ACKed while UI remains.
+        guard persistDeletionJournal(journal, in: directory) else {
             return false
         }
 
-        records[messageID] = tombstone
-        if let victim, victim != messageID {
-            records.removeValue(forKey: victim)
-            removeRecord(messageID: victim, from: directory)
-        }
-        runtime.records = records
-        runtime.volatileTombstones.removeValue(forKey: messageID)
-        removePayloadRecordedByTombstone(tombstone)
+        runtime.deletionJournal = journal
+        _ = recoverDeletionJournal(in: directory)
         return true
     }
 
-    private func loadIndexIfNeeded(
+    func recordDeleted(messageID: String) -> Bool {
+        guard PrivateMediaMessageIdentity.isStableID(messageID) else {
+            return false
+        }
+        return recordDeleted(messageIDs: [messageID])
+    }
+
+    /// Resolves every path a deletion transaction may target. The incoming
+    /// allocator reserves this set at the journal barrier so a concurrent raw
+    /// arrival cannot reuse a missing UI fallback.
+    func prospectiveDeletionPayloadPaths(
+        messageIDs: [String],
+        payloadRelativePaths: [String: String]
+    ) -> Set<String>? {
+        let stableIDs = Set(
+            messageIDs.filter(PrivateMediaMessageIdentity.isStableID)
+        )
+        guard !stableIDs.isEmpty else { return [] }
+
+        runtime.lock.lock()
+        defer { runtime.lock.unlock() }
+
+        let date = now()
+        guard let directory = resolvedReceiptDirectory(),
+              loadDurableStateIfNeeded(from: directory, at: date) else {
+            return nil
+        }
+        _ = recoverDeletionJournal(in: directory)
+        guard let journal = runtime.deletionJournal,
+              let records = runtime.records else {
+            return nil
+        }
+
+        var paths: Set<String> = []
+        for messageID in stableIDs {
+            if let entry = journal[messageID] {
+                paths.formUnion(entry.relativePaths)
+                continue
+            }
+            if let relativePath = records[messageID]?.relativePath {
+                paths.insert(relativePath)
+            }
+            if let relativePath = payloadRelativePaths[messageID] {
+                paths.insert(relativePath)
+            }
+        }
+        guard paths.allSatisfy({
+            candidatePayload(relativePath: $0) != nil
+        }) else {
+            return nil
+        }
+        return Set(paths.compactMap {
+            candidatePayload(relativePath: $0)?
+                .standardizedFileURL.path
+        })
+    }
+
+    /// Paths owned by accepted receipts, legacy pathful tombstones, or the
+    /// deletion journal. Incoming allocation must not reuse any of them for a
+    /// different ID.
+    func reservedPayloadPaths() -> Set<String>? {
+        runtime.lock.lock()
+        defer { runtime.lock.unlock() }
+
+        let date = now()
+        guard let directory = resolvedReceiptDirectory(),
+              loadDurableStateIfNeeded(from: directory, at: date) else {
+            return nil
+        }
+        _ = recoverDeletionJournal(in: directory)
+        guard let journal = runtime.deletionJournal,
+              let records = runtime.records else {
+            return nil
+        }
+        let recordPaths = records.values.compactMap(\.relativePath)
+        let journalPaths = journal.values.flatMap(\.relativePaths)
+        return Set((recordPaths + journalPaths).compactMap { relativePath in
+            candidatePayload(relativePath: relativePath)?
+                .standardizedFileURL.path
+        })
+    }
+
+    private func scrubLegacyTombstone(
+        _ tombstone: ReceiptRecord,
+        messageID: String,
+        in directory: URL,
+        records: inout [String: ReceiptRecord]
+    ) -> Bool {
+        guard tombstone.kind == .tombstone,
+              tombstone.relativePath != nil else {
+            return true
+        }
+        // Pre-journal tombstones cannot prove that the current file is still
+        // the payload they originally described. Older allocators did not
+        // reserve these paths, so a raw/public arrival may have reused the
+        // basename. Shed the ambiguous path without unlinking anything.
+        let pathless = ReceiptRecord(
+            kind: .tombstone,
+            relativePath: nil,
+            recordedAt: tombstone.recordedAt
+        )
+        guard persist(
+            pathless,
+            messageID: messageID,
+            to: directory
+        ) else {
+            return false
+        }
+        records[messageID] = pathless
+        runtime.records = records
+        return true
+    }
+
+    private func loadDurableStateIfNeeded(
         from directory: URL,
         at date: Date
-    ) -> [String: ReceiptRecord]? {
-        if let records = runtime.records {
-            return records
+    ) -> Bool {
+        if runtime.records != nil, runtime.deletionJournal != nil {
+            return true
         }
 
         do {
@@ -268,7 +497,7 @@ final class BLEPrivateMediaReceiptStore: @unchecked Sendable {
                 "❌ Failed to create private-media receipt directory: \(error)",
                 category: .session
             )
-            return nil
+            return false
         }
 
         let urls: [URL]
@@ -287,12 +516,13 @@ final class BLEPrivateMediaReceiptStore: @unchecked Sendable {
                 "❌ Failed to enumerate private-media receipts: \(error)",
                 category: .session
             )
-            return nil
+            return false
         }
 
         var records: [String: ReceiptRecord] = [:]
+        var scannedRecords: [String: ReceiptRecord] = [:]
         var expired: [String] = []
-        var tombstones: [ReceiptRecord] = []
+        var tombstones: [(messageID: String, record: ReceiptRecord)] = []
         for url in urls {
             guard url.pathExtension == "json" else { continue }
             let messageID = url.deletingPathExtension().lastPathComponent
@@ -311,7 +541,7 @@ final class BLEPrivateMediaReceiptStore: @unchecked Sendable {
                     "❌ Failed to read private-media receipt \(messageID.prefix(12))…: \(error)",
                     category: .session
                 )
-                return nil
+                return false
             }
 
             guard isStructurallyValid(record) else {
@@ -319,16 +549,21 @@ final class BLEPrivateMediaReceiptStore: @unchecked Sendable {
                     "❌ Invalid private-media receipt \(messageID.prefix(12))…",
                     category: .session
                 )
-                return nil
+                return false
             }
-            if isExpired(record.recordedAt, at: date) {
+            scannedRecords[messageID] = record
+            if record.kind == .tombstone {
+                tombstones.append((messageID, record))
+            }
+            let retainsAcceptedPath =
+                record.kind == .accepted
+                    && record.relativePath.flatMap(existingPayload) != nil
+            if isExpired(record.recordedAt, at: date),
+               !retainsAcceptedPath {
                 expired.append(messageID)
                 continue
             }
             records[messageID] = record
-            if record.kind == .tombstone {
-                tombstones.append(record)
-            }
         }
 
         let overflow = overflowVictims(in: records)
@@ -336,17 +571,229 @@ final class BLEPrivateMediaReceiptStore: @unchecked Sendable {
             records.removeValue(forKey: messageID)
         }
 
-        // Install the index only after every stable-ID record was read and
-        // validated successfully. Cleanup cannot influence a failed scan.
-        runtime.records = records
+        let journal: [String: DeletionJournalEntry]
+        let journalURL = deletionJournalURL(in: directory)
+        if fileManager.fileExists(atPath: journalURL.path) {
+            do {
+                let data = try dataReader?(journalURL)
+                    ?? Data(contentsOf: journalURL)
+                let snapshot = try JSONDecoder().decode(
+                    DeletionJournal.self,
+                    from: data
+                )
+                guard snapshot.version == 1,
+                      snapshot.entries.count <= capacity,
+                      snapshot.entries.allSatisfy({ messageID, entry in
+                          PrivateMediaMessageIdentity.isStableID(messageID)
+                              && !entry.relativePaths.isEmpty
+                              && entry.relativePaths.count <=
+                                Self.maximumDeletionPathsPerMessage
+                              && Set(entry.relativePaths).count
+                                == entry.relativePaths.count
+                              && entry.relativePaths.allSatisfy {
+                                  candidatePayload(relativePath: $0) != nil
+                              }
+                      }) else {
+                    SecureLogger.error(
+                        "❌ Invalid private-media deletion journal",
+                        category: .session
+                    )
+                    return false
+                }
+                journal = snapshot.entries
+            } catch {
+                // The journal is the all-ID commit record. It may never be
+                // skipped or treated as empty when unreadable.
+                SecureLogger.error(
+                    "❌ Failed to read private-media deletion journal: \(error)",
+                    category: .session
+                )
+                return false
+            }
+        } else {
+            journal = [:]
+        }
+
+        var protectedFromPruning: Set<String> = []
+
+        // Old per-ID tombstones may still carry a payload path from before the
+        // deletion journal existed. That path is inherently ambiguous because
+        // old allocators did not reserve it. Convert it to a pathless
+        // tombstone without unlinking any current file.
+        for (messageID, tombstone) in tombstones
+        where journal[messageID] == nil
+            && tombstone.relativePath != nil {
+            let pathless = ReceiptRecord(
+                kind: .tombstone,
+                relativePath: nil,
+                recordedAt: tombstone.recordedAt
+            )
+            guard persist(
+                pathless,
+                messageID: messageID,
+                to: directory
+            ) else {
+                records[messageID] = tombstone
+                protectedFromPruning.insert(messageID)
+                continue
+            }
+            scannedRecords[messageID] = pathless
+            if records[messageID] != nil {
+                records[messageID] = pathless
+            }
+        }
 
         for messageID in expired + overflow {
-            removeRecord(messageID: messageID, from: directory)
+            guard !protectedFromPruning.contains(messageID) else { continue }
+            if !removeRecord(messageID: messageID, from: directory),
+               let record = scannedRecords[messageID] {
+                records[messageID] = record
+            }
         }
-        for tombstone in tombstones {
-            removePayloadRecordedByTombstone(tombstone)
+
+        // Install caches only after every per-ID record and the batch journal
+        // have been read and validated. Failed legacy cleanup remains indexed
+        // and path-reserved instead of blocking unrelated media.
+        runtime.records = records
+        runtime.deletionJournal = journal
+        return true
+    }
+
+    /// Idempotently materializes the write-ahead journal. An entry leaves the
+    /// journal only after its per-ID tombstone is durable and every recorded
+    /// payload is absent. Any failure keeps the journal authoritative for a
+    /// later lookup or process restart.
+    @discardableResult
+    private func recoverDeletionJournal(in directory: URL) -> Bool {
+        guard let journal = runtime.deletionJournal,
+              !journal.isEmpty,
+              var records = runtime.records else {
+            return true
         }
-        return records
+
+        let preservedMessageIDs = Set(journal.keys)
+        var remaining = journal
+        let orderedEntries = journal.sorted { lhs, rhs in
+            if lhs.value.recordedAt == rhs.value.recordedAt {
+                return lhs.key < rhs.key
+            }
+            return lhs.value.recordedAt < rhs.value.recordedAt
+        }
+
+        for (messageID, journalEntry) in orderedEntries {
+            let pathlessTombstone = ReceiptRecord(
+                kind: .tombstone,
+                relativePath: nil,
+                recordedAt: journalEntry.recordedAt
+            )
+            if records[messageID] != pathlessTombstone {
+                let victim = capacityVictim(
+                    for: .tombstone,
+                    replacing: messageID,
+                    in: records,
+                    preserving: preservedMessageIDs
+                )
+                if records[messageID]?.kind != .tombstone,
+                   records.values.lazy.filter({
+                       $0.kind == .tombstone
+                   }).count >= capacity,
+                   victim == nil {
+                    continue
+                }
+                guard persist(
+                    pathlessTombstone,
+                    messageID: messageID,
+                    to: directory
+                ) else {
+                    continue
+                }
+                records[messageID] = pathlessTombstone
+                if let victim, victim != messageID {
+                    records.removeValue(forKey: victim)
+                    removeRecord(messageID: victim, from: directory)
+                }
+            }
+
+            // Only the journal retains the paths. Once every unlink succeeds,
+            // the durable per-ID tombstone is pathless and cannot later
+            // delete a different payload that reused the basename.
+            let removedEveryPayload = journalEntry.relativePaths.allSatisfy {
+                removePayloadRecordedByTombstone(ReceiptRecord(
+                    kind: .tombstone,
+                    relativePath: $0,
+                    recordedAt: journalEntry.recordedAt
+                ))
+            }
+            guard removedEveryPayload else {
+                continue
+            }
+            remaining.removeValue(forKey: messageID)
+        }
+
+        runtime.records = records
+        guard remaining != journal else { return false }
+
+        if remaining.isEmpty {
+            guard removeDeletionJournal(in: directory) else { return false }
+        } else {
+            guard persistDeletionJournal(remaining, in: directory) else {
+                return false
+            }
+        }
+        runtime.deletionJournal = remaining
+        return remaining.isEmpty
+    }
+
+    private func persistDeletionJournal(
+        _ entries: [String: DeletionJournalEntry],
+        in directory: URL
+    ) -> Bool {
+        do {
+            try fileManager.createDirectory(
+                at: directory,
+                withIntermediateDirectories: true,
+                attributes: nil
+            )
+            let data = try JSONEncoder().encode(
+                DeletionJournal(version: 1, entries: entries)
+            )
+            var options: Data.WritingOptions = [.atomic]
+            #if os(iOS)
+            options.insert(
+                .completeFileProtectionUntilFirstUserAuthentication
+            )
+            #endif
+            try dataWriter(data, deletionJournalURL(in: directory), options)
+            return true
+        } catch {
+            SecureLogger.error(
+                "❌ Failed to persist private-media deletion journal: \(error)",
+                category: .session
+            )
+            return false
+        }
+    }
+
+    private func removeDeletionJournal(in directory: URL) -> Bool {
+        let url = deletionJournalURL(in: directory)
+        guard fileManager.fileExists(atPath: url.path) else { return true }
+        do {
+            try fileManager.removeItem(at: url)
+            return true
+        } catch {
+            SecureLogger.warning(
+                "⚠️ Failed to retire private-media deletion journal: \(error)",
+                category: .session
+            )
+            return false
+        }
+    }
+
+    private func deletionJournalURL(in directory: URL) -> URL {
+        directory.appendingPathComponent(
+            Self.deletionJournalFileName,
+            isDirectory: false
+        )
     }
 
     private func isStructurallyValid(_ record: ReceiptRecord) -> Bool {
@@ -369,10 +816,14 @@ final class BLEPrivateMediaReceiptStore: @unchecked Sendable {
     ) -> [String] {
         var victims: [String] = []
         for kind in [ReceiptRecord.Kind.accepted, .tombstone] {
-            let matching = records.filter { $0.value.kind == kind }
-            let overflow = matching.count - capacity
+            let allMatching = records.filter { $0.value.kind == kind }
+            let overflow = allMatching.count - capacity
             guard overflow > 0 else { continue }
-            victims.append(contentsOf: matching.sorted { lhs, rhs in
+            let eligible = allMatching.filter { _, record in
+                guard kind == .accepted else { return true }
+                return record.relativePath.flatMap(existingPayload) == nil
+            }
+            victims.append(contentsOf: eligible.sorted { lhs, rhs in
                 if lhs.value.recordedAt == rhs.value.recordedAt {
                     return lhs.key < rhs.key
                 }
@@ -389,13 +840,24 @@ final class BLEPrivateMediaReceiptStore: @unchecked Sendable {
     private func capacityVictim(
         for incomingKind: ReceiptRecord.Kind,
         replacing messageID: String,
-        in records: [String: ReceiptRecord]
+        in records: [String: ReceiptRecord],
+        preserving preservedMessageIDs: Set<String> = []
     ) -> String? {
         guard records[messageID]?.kind != incomingKind else { return nil }
+        // During a live session an accepted receipt is the only durable owner
+        // of its filename, even after quota removes the payload. Evicting it
+        // here could let another ID reuse the path while the old bubble still
+        // exists. The large capacity therefore acts as admission control.
+        guard incomingKind != .accepted else { return nil }
         let matching = records.filter {
-            $0.key != messageID && $0.value.kind == incomingKind
+            $0.key != messageID
+                && !preservedMessageIDs.contains($0.key)
+                && $0.value.kind == incomingKind
         }
-        guard matching.count >= capacity else { return nil }
+        let currentCount = records.values.lazy.filter {
+            $0.kind == incomingKind
+        }.count
+        guard currentCount >= capacity else { return nil }
         return matching.min { lhs, rhs in
             if lhs.value.recordedAt == rhs.value.recordedAt {
                 return lhs.key < rhs.key
@@ -421,7 +883,7 @@ final class BLEPrivateMediaReceiptStore: @unchecked Sendable {
             options.insert(.completeFileProtectionUntilFirstUserAuthentication)
             #endif
             let url = recordURL(messageID: messageID, in: directory)
-            try data.write(to: url, options: options)
+            try dataWriter(data, url, options)
             return true
         } catch {
             SecureLogger.error(
@@ -432,16 +894,22 @@ final class BLEPrivateMediaReceiptStore: @unchecked Sendable {
         }
     }
 
-    private func removeRecord(messageID: String, from directory: URL) {
+    @discardableResult
+    private func removeRecord(
+        messageID: String,
+        from directory: URL
+    ) -> Bool {
         let url = recordURL(messageID: messageID, in: directory)
-        guard fileManager.fileExists(atPath: url.path) else { return }
+        guard fileManager.fileExists(atPath: url.path) else { return true }
         do {
             try fileManager.removeItem(at: url)
+            return true
         } catch {
             SecureLogger.warning(
                 "⚠️ Failed to prune private-media receipt \(messageID.prefix(12))…: \(error)",
                 category: .session
             )
+            return false
         }
     }
 
@@ -451,39 +919,55 @@ final class BLEPrivateMediaReceiptStore: @unchecked Sendable {
             .appendingPathExtension("json")
     }
 
-    private func removePayloadRecordedByTombstone(_ record: ReceiptRecord) {
+    @discardableResult
+    private func removePayloadRecordedByTombstone(
+        _ record: ReceiptRecord
+    ) -> Bool {
         guard record.kind == .tombstone,
               let relativePath = record.relativePath,
               let payload = candidatePayload(relativePath: relativePath),
               fileManager.fileExists(atPath: payload.path) else {
-            return
+            return true
+        }
+        guard let values = try? payload.resourceValues(
+            forKeys: [.isRegularFileKey]
+        ),
+        values.isRegularFile == true else {
+            SecureLogger.warning(
+                "⚠️ Refusing to remove non-file private-media payload",
+                category: .session
+            )
+            return false
         }
         do {
-            try fileManager.removeItem(at: payload)
+            try payloadRemover(payload)
+            return !fileManager.fileExists(atPath: payload.path)
         } catch {
             SecureLogger.warning(
                 "⚠️ Failed to remove explicitly deleted private media: \(error)",
                 category: .session
             )
+            return false
         }
     }
 
-    private func addVolatileTombstone(_ messageID: String, at date: Date) {
-        runtime.volatileTombstones[messageID] = date
-        let overflow = runtime.volatileTombstones.count - capacity
-        guard overflow > 0 else { return }
-        let oldest = runtime.volatileTombstones.sorted {
-            if $0.value == $1.value { return $0.key < $1.key }
-            return $0.value < $1.value
+    private func isSafeDeletionTarget(relativePath: String) -> Bool {
+        guard let payload = candidatePayload(relativePath: relativePath) else {
+            return false
         }
-        for (oldMessageID, _) in oldest.prefix(overflow) {
-            runtime.volatileTombstones.removeValue(forKey: oldMessageID)
+        guard fileManager.fileExists(atPath: payload.path) else {
+            return true
         }
+        return (try? payload.resourceValues(
+            forKeys: [.isRegularFileKey]
+        ).isRegularFile) == true
     }
 
     private func validExistingPayload(_ url: URL) -> URL? {
         let standardized = url.standardizedFileURL
-        guard isInsideFilesDirectory(standardized) else { return nil }
+        guard isInsideIncomingMediaDirectory(standardized) else {
+            return nil
+        }
         var isDirectory: ObjCBool = false
         guard fileManager.fileExists(
             atPath: standardized.path,
@@ -520,15 +1004,27 @@ final class BLEPrivateMediaReceiptStore: @unchecked Sendable {
         let candidate = filesRoot
             .appendingPathComponent(relativePath, isDirectory: false)
             .standardizedFileURL
-        guard candidate.path.hasPrefix(filesRoot.path + "/") else { return nil }
+        guard isInsideIncomingMediaDirectory(candidate) else { return nil }
         return candidate
     }
 
-    private func isInsideFilesDirectory(_ url: URL) -> Bool {
+    private func isInsideIncomingMediaDirectory(_ url: URL) -> Bool {
         guard let filesRoot = try? filesDirectory().standardizedFileURL else {
             return false
         }
-        return url.standardizedFileURL.path.hasPrefix(filesRoot.path + "/")
+        let parentPath = url.standardizedFileURL
+            .deletingLastPathComponent().path
+        return [
+            "voicenotes/incoming",
+            "images/incoming",
+            "files/incoming"
+        ].contains { relativeDirectory in
+            filesRoot.appendingPathComponent(
+                relativeDirectory,
+                isDirectory: true
+            )
+            .standardizedFileURL.path == parentPath
+        }
     }
 
     private func resolvedReceiptDirectory() -> URL? {

bitchat/Services/BLE/BLEService.swift

@@ -1119,6 +1119,29 @@ final class BLEService: NSObject {
         collectionsQueue.sync { peerRegistry.capabilities(for: peerID) }
     }
 
+    func authenticatedPrivateMediaReceiptSessionGeneration(
+        to peerID: PeerID
+    ) -> UUID? {
+        let normalizedPeerID = peerID.toShort()
+        let currentNoiseGeneration =
+            noiseService.sessionGeneration(for: normalizedPeerID)
+        return collectionsQueue.sync {
+            guard let generation =
+                    privateMediaSessionGenerations[normalizedPeerID],
+                  generation == currentNoiseGeneration,
+                  let authenticated =
+                    authenticatedPeerStates[normalizedPeerID],
+                  authenticated.sessionGeneration == generation,
+                  authenticated.capabilities.contains(.privateMedia),
+                  authenticated.capabilities.contains(
+                    .privateMediaReceipts
+                  ) else {
+                return nil
+            }
+            return generation
+        }
+    }
+
     private func privateMediaPolicyFingerprint(
         for peerID: PeerID,
         expectedSessionGeneration: UUID?
@@ -1603,6 +1626,36 @@ final class BLEService: NSObject {
         to peerID: PeerID,
         transferId: String,
         allowLegacyFallback: Bool
+    ) {
+        sendFilePrivate(
+            filePacket,
+            to: peerID,
+            transferId: transferId,
+            allowLegacyFallback: allowLegacyFallback,
+            requiresAuthenticatedPrivateMediaReceipts: false
+        )
+    }
+
+    func sendFilePrivateReceiptRetry(
+        _ filePacket: BitchatFilePacket,
+        to peerID: PeerID,
+        transferId: String
+    ) {
+        sendFilePrivate(
+            filePacket,
+            to: peerID,
+            transferId: transferId,
+            allowLegacyFallback: false,
+            requiresAuthenticatedPrivateMediaReceipts: true
+        )
+    }
+
+    private func sendFilePrivate(
+        _ filePacket: BitchatFilePacket,
+        to peerID: PeerID,
+        transferId: String,
+        allowLegacyFallback: Bool,
+        requiresAuthenticatedPrivateMediaReceipts: Bool
     ) {
         // Register before enqueueing onto messageQueue. This closes the window
         // where cancel/delete could run first, observe no scheduler state, and
@@ -1715,6 +1768,25 @@ final class BLEService: NSObject {
                 self.privateMediaTransferAdmissions.finish(transferId)
                 return
             }
+            if requiresAuthenticatedPrivateMediaReceipts,
+               self.authenticatedPrivateMediaReceiptSessionGeneration(
+                    to: targetID
+               ) == nil {
+                SecureLogger.warning(
+                    "Private media retry blocked without current authenticated receipt support for \(targetID.id.prefix(8))…",
+                    category: .security
+                )
+                TransferProgressManager.shared.rejectBeforeStart(
+                    id: transferId,
+                    reason: String(
+                        localized: "content.delivery.reason.private_media_capability_unresolved",
+                        defaultValue: "Could not confirm encrypted media support",
+                        comment: "Failure reason when private-media capability negotiation did not resolve"
+                    )
+                )
+                self.privateMediaTransferAdmissions.finish(transferId)
+                return
+            }
             guard let typedPayload = BLENoisePayloadFactory.privateFile(filePacket) else {
                 SecureLogger.error("❌ Failed to encode file packet for private send", category: .session)
                 TransferProgressManager.shared.rejectBeforeStart(
@@ -1725,6 +1797,21 @@ final class BLEService: NSObject {
                 return
             }
             guard self.noiseService.hasEstablishedSession(with: targetID) else {
+                if requiresAuthenticatedPrivateMediaReceipts {
+                    // A retry belongs to one exact authenticated generation.
+                    // Never let it enter the ordinary pending queue where a
+                    // bit-8-only replacement session could later flush it.
+                    TransferProgressManager.shared.rejectBeforeStart(
+                        id: transferId,
+                        reason: String(
+                            localized: "content.delivery.reason.private_media_capability_unresolved",
+                            defaultValue: "Could not confirm encrypted media support",
+                            comment: "Failure reason when private-media capability negotiation did not resolve"
+                        )
+                    )
+                    self.privateMediaTransferAdmissions.finish(transferId)
+                    return
+                }
                 let queued = self.collectionsQueue.sync(flags: .barrier) {
                     self.privateMediaTransferAdmissions.withActive(transferId) {
                         self.pendingNoiseSessionQueues.appendTypedPayload(
@@ -1756,7 +1843,12 @@ final class BLEService: NSObject {
                     self.privateMediaTransferAdmissions.finish(transferId)
                     return
                 }
-                let packet = try self.makeEncryptedNoisePacket(typedPayload, to: targetID)
+                let packet = try self.makeEncryptedNoisePacket(
+                    typedPayload,
+                    to: targetID,
+                    requiresAuthenticatedPrivateMediaReceipts:
+                        requiresAuthenticatedPrivateMediaReceipts
+                )
                 guard self.privateMediaTransferAdmissions.isActive(transferId) else {
                     self.privateMediaTransferAdmissions.finish(transferId)
                     return
@@ -2568,6 +2660,18 @@ final class BLEService: NSObject {
             removeIncomingFile: { [weak self] storedURL in
                 self?.incomingFileStore.removeIncomingFile(at: storedURL)
             },
+            finishIncomingFileDelivery: { [weak self] storedURL in
+                // Serialize pending-owner release behind deletion barriers.
+                // If /clear snapshots before this UI insertion, its already
+                // queued barrier must still observe the path as pending. If
+                // insertion wins first, the next MainActor snapshot sees the
+                // new bubble and protects the path explicitly.
+                self?.messageQueue.async(flags: .barrier) {
+                    self?.incomingFileStore.finishIncomingFileDelivery(
+                        at: storedURL
+                    )
+                }
+            },
             isPrivateMediaSenderBlocked: { [weak self] peerID in
                 guard let self else { return false }
                 let senderStaticKey = self.noiseService.getPeerPublicKeyData(peerID)
@@ -2592,11 +2696,12 @@ final class BLEService: NSObject {
                 }
                 self.sendDeliveryAck(for: messageID, to: peerID)
             },
-            deliverMessage: { [weak self] message, shouldDeliver, completion in
+            deliverMessage: { [weak self] message, shouldDeliver, completion, finalization in
                 self?.emitTransportEvent(
                     .messageReceived(message),
                     shouldDeliver: shouldDeliver,
-                    completion: completion
+                    completion: completion,
+                    finalization: finalization
                 )
             }
         )
@@ -3387,6 +3492,18 @@ extension BLEService {
         }
     }
 
+    func _test_emitTransportEvent(
+        _ event: TransportEvent,
+        completion: @escaping () -> Void,
+        finalization: @escaping (TransportEventDeliveryOutcome) -> Void
+    ) {
+        emitTransportEvent(
+            event,
+            completion: completion,
+            finalization: finalization
+        )
+    }
+
     func _test_handlePacket(_ packet: BitchatPacket, fromPeerID: PeerID, preseedPeer: Bool = true, signingPublicKey: Data? = nil) {
         if preseedPeer {
             // Ensure the synthetic peer is known and marked verified for public-message tests
@@ -4292,8 +4409,87 @@ extension BLEService {
     // No alias rotation or advertising restarts required.
 }
 
+// MARK: - Private Media Deletion
+
+extension BLEService: PrivateMediaDeletionPersisting {
+    @MainActor
+    func persistDeletedPrivateMedia(
+        messageIDs: [String],
+        payloadRelativePaths: [String: String],
+        protectedPayloadRelativePaths: Set<String>,
+        completion: @escaping @MainActor (Bool) -> Void
+    ) {
+        let fileStore = incomingFileStore
+        messageQueue.async(flags: .barrier) {
+            guard let reservation = fileStore
+                    .reservePrivateMediaDeletion(
+                        messageIDs: messageIDs,
+                        payloadRelativePaths: payloadRelativePaths
+                    ) else {
+                Task { @MainActor in
+                    completion(false)
+                }
+                return
+            }
+            let persisted = fileStore
+                .commitPrivateMediaDeletion(
+                    reservation: reservation,
+                    messageIDs: messageIDs,
+                    payloadRelativePaths: payloadRelativePaths,
+                    protectedPayloadRelativePaths:
+                        protectedPayloadRelativePaths
+                )
+            Task { @MainActor in
+                completion(persisted)
+            }
+        }
+    }
+}
+
 // MARK: - Private Helpers
 
+enum TransportEventDeliveryOutcome: Equatable {
+    /// A synchronous sink inserted the message and revalidation succeeded.
+    case accepted
+    /// A supported plain delegate was invoked, but insertion cannot be
+    /// confirmed synchronously.
+    case invokedUnconfirmed
+    /// No sink accepted the event, or receipt revalidation rejected it.
+    case rejected
+}
+
+enum TransportEventDeliveryGate {
+    /// Runs finalization exactly once for every attempted main-actor delivery,
+    /// including pre-insertion rejection, a missing/rejecting sink, and
+    /// post-insertion revalidation failure. Only a fully accepted delivery
+    /// runs `completion` (for example, a stable-media ACK).
+    @MainActor
+    static func attempt(
+        shouldDeliver: () -> Bool,
+        deliver: () -> TransportEventDeliveryOutcome,
+        completion: () -> Void,
+        finalization: (TransportEventDeliveryOutcome) -> Void
+    ) {
+        var outcome = TransportEventDeliveryOutcome.rejected
+        defer { finalization(outcome) }
+        guard shouldDeliver() else {
+            return
+        }
+        switch deliver() {
+        case .rejected:
+            return
+        case .invokedUnconfirmed:
+            outcome = .invokedUnconfirmed
+            return
+        case .accepted:
+            break
+        }
+        guard shouldDeliver() else { return }
+        outcome = .accepted
+        completion()
+    }
+}
+
 extension BLEService {
     
     /// Notify UI on the MainActor to satisfy Swift concurrency isolation
@@ -4317,52 +4513,71 @@ extension BLEService {
     private func emitTransportEvent(
         _ event: TransportEvent,
         shouldDeliver: (() -> Bool)? = nil,
-        completion: (() -> Void)? = nil
+        completion: (() -> Void)? = nil,
+        finalization: ((TransportEventDeliveryOutcome) -> Void)? = nil
     ) {
-        notifyUI { [weak self] in
+        guard let generation = capturePanicLifecycleGeneration() else {
+            Task { @MainActor in
+                finalization?(.rejected)
+            }
+            return
+        }
+        Task { @MainActor [weak self] in
             guard let self,
-                  shouldDeliver?() ?? true,
-                  self.deliverTransportEvent(event),
-                  // Quota cleanup can race the asynchronous main-actor hop or
-                  // the synchronous ConversationStore upsert. ACK only while
-                  // the exact durable mapping and file still resolve.
-                  shouldDeliver?() ?? true else {
+                  self.isCurrentPanicLifecycleGeneration(generation) else {
+                finalization?(.rejected)
                 return
             }
-            completion?()
+            TransportEventDeliveryGate.attempt(
+                shouldDeliver: {
+                    self.isCurrentPanicLifecycleGeneration(generation)
+                        && (shouldDeliver?() ?? true)
+                },
+                deliver: {
+                    return self.deliverTransportEvent(event)
+                },
+                completion: { completion?() },
+                finalization: { finalization?($0) }
+            )
         }
     }
 
     @MainActor
     @discardableResult
-    private func deliverTransportEvent(_ event: TransportEvent) -> Bool {
+    private func deliverTransportEvent(
+        _ event: TransportEvent
+    ) -> TransportEventDeliveryOutcome {
         if case .messageReceived(let message) = event {
             if let synchronousDelegate =
                 eventDelegate as? SynchronousMessageTransportEventDelegate {
                 return synchronousDelegate
                     .didReceiveTransportMessageSynchronously(message)
+                    ? .accepted
+                    : .rejected
             }
             if let eventDelegate {
                 eventDelegate.didReceiveTransportEvent(event)
-                return false
+                return .invokedUnconfirmed
             }
             if let synchronousDelegate =
                 delegate as? SynchronousMessageTransportEventDelegate {
                 return synchronousDelegate
                     .didReceiveTransportMessageSynchronously(message)
+                    ? .accepted
+                    : .rejected
             }
         }
 
         if let eventDelegate {
             eventDelegate.didReceiveTransportEvent(event)
-            return true
+            return .accepted
         } else {
-            guard let delegate else { return false }
+            guard let delegate else { return .rejected }
             delegate.receiveTransportEvent(event)
             if case .messageReceived = event {
-                return false
+                return .invokedUnconfirmed
             }
-            return true
+            return .accepted
         }
     }
 
@@ -5164,7 +5379,11 @@ extension BLEService {
         }
     }
 
-    private func makeEncryptedNoisePacket(_ typedPayload: Data, to peerID: PeerID) throws -> BitchatPacket {
+    private func makeEncryptedNoisePacket(
+        _ typedPayload: Data,
+        to peerID: PeerID,
+        requiresAuthenticatedPrivateMediaReceipts: Bool = false
+    ) throws -> BitchatPacket {
         let encrypted: Data
         let isPrivateFile = NoisePayloadType.isPrivateFile(rawValue: typedPayload.first)
         if isPrivateFile {
@@ -5174,6 +5393,13 @@ extension BLEService {
                       let authenticated = authenticatedPeerStates[peerID],
                       authenticated.sessionGeneration == generation,
                       authenticated.capabilities.contains(.privateMedia) else { return nil }
+                if requiresAuthenticatedPrivateMediaReceipts {
+                    guard authenticated.capabilities.contains(
+                        .privateMediaReceipts
+                    ) else {
+                        return nil
+                    }
+                }
                 return generation
             }
             guard let provenGeneration else {

bitchat/Services/Courier/CourierStore.swift

@@ -322,7 +322,7 @@ final class CourierStore {
 
     /// Envelopes eligible to park on relays as bridge courier drops. Merely
     /// offering one does not start its cooldown: the caller commits that only
-    /// after a relay explicitly accepts the event via NIP-20 OK.
+    /// after a relay explicitly accepts the event via NIP-01 `OK`.
     func envelopesForBridgePublish(cooldown: TimeInterval) -> [CourierEnvelope] {
         let date = now()
         return queue.sync {

bitchat/Services/Gateway/BridgeCourierService.swift

@@ -67,7 +67,7 @@ final class BridgeCourierService: ObservableObject {
     var relaysConnected: (@MainActor () -> Bool)?
     /// Publishes a signed drop event directly to connected default (DM)
     /// relays. Completion is true only after at least one relay explicitly
-    /// accepts the event via NIP-20 OK; this must never mean "queued in RAM"
+    /// accepts the event via NIP-01 `OK`; this must never mean "queued in RAM"
     /// or merely "written to a socket".
     var publishEvent: (@MainActor (NostrEvent, @escaping @MainActor (Bool) -> Void) -> Void)?
     /// (Re)opens the drop subscription for the given hex tags.
@@ -129,7 +129,7 @@ final class BridgeCourierService: ObservableObject {
     /// a newer attempt for the same message.
     private var activeDropOperations: [String: ActiveDropOperation] = [:]
     /// Held-envelope publishes have no sender message ID, but still need an
-    /// in-flight identity: repeated refreshes inside the NIP-20 wait window
+    /// in-flight identity: repeated refreshes inside the relay-OK wait window
     /// must not mint duplicate relay events for the same opaque envelope.
     private var heldDropOperations: [Data: UUID] = [:]
     /// Deterministically invalid envelopes are suppressed for this process,
@@ -275,7 +275,7 @@ final class BridgeCourierService: ObservableObject {
     /// Publishes a drop, or queues it when relays are down. `messageID` is the
     /// sender-side dedup key (nil for held/relayed envelopes we don't track);
     /// it rides the pending queue so an evicted or failed drop can release its
-    /// in-flight slot. Completion reports actual NIP-20 relay acceptance.
+    /// in-flight slot. Completion reports actual NIP-01 relay acceptance.
     private func publishDrop(
         _ envelope: CourierEnvelope,
         messageID: String? = nil,

bitchat/Services/MessageDeduplicationService.swift

@@ -172,11 +172,11 @@ final class MessageDeduplicationService {
     /// Cache for Nostr ACK deduplication (messageId:ackType:senderPubkey format)
     private let nostrAckCache: LRUDeduplicationCache<Bool>
 
-    /// Optional cross-launch persistence for the Nostr event cache. NIP-59
-    /// randomizes gift-wrap timestamps, so DM subscriptions look back 24h and
-    /// relays redeliver the same events on every launch; without this record
-    /// each relaunch reprocesses old PMs and acks. Nil (tests, macOS callers
-    /// that don't opt in) keeps the cache purely in-memory.
+    /// Optional cross-launch persistence for the Nostr event cache. BitChat
+    /// randomizes private-envelope timestamps, so DM subscriptions look back
+    /// 24h and relays redeliver the same events on every launch; without this
+    /// record each relaunch reprocesses old PMs and acks. Nil (tests, macOS
+    /// callers that don't opt in) keeps the cache purely in-memory.
     private let nostrEventStore: NostrProcessedEventStore?
     private let nostrEventCapacity: Int
     private var persistScheduled = false
@@ -314,7 +314,7 @@ final class MessageDeduplicationService {
     // MARK: - Clear
 
     /// Clears all caches. This is the wipe/panic path: the persisted
-    /// gift-wrap record goes with everything else.
+    /// private-envelope record goes with everything else.
     func clearAll() {
         contentCache.clear()
         nostrEventCache.clear()
@@ -325,7 +325,7 @@ final class MessageDeduplicationService {
 
     /// Clears only the in-memory Nostr caches (events and ACKs). Runs on
     /// every geohash channel switch, so the disk record deliberately
-    /// survives — wiping it here would forfeit cross-launch gift-wrap dedup
+    /// survives — wiping it here would forfeit cross-launch private-envelope dedup
     /// each time the user changes channels (flagged by Codex on #1398).
     func clearNostrCaches() {
         nostrEventCache.clear()

bitchat/Services/MessageRouter.swift

@@ -158,6 +158,16 @@ final class MessageRouter {
         }
     }
 
+    /// Wire one typed event sink to every route, including the queue-backed
+    /// Nostr transport. Keeping this at the router boundary prevents a relay
+    /// admission failure from disappearing merely because only the primary
+    /// mesh transport was assigned a UI delegate.
+    func setEventDelegate(_ delegate: TransportEventDelegate?) {
+        for transport in transports {
+            transport.eventDelegate = delegate
+        }
+    }
+
     // MARK: - Transport Selection
 
     private func reachableTransport(for peerID: PeerID) -> Transport? {

bitchat/Services/NostrProcessedEventStore.swift

@@ -9,10 +9,10 @@
 import BitLogger
 import Foundation
 
-/// Disk persistence for processed gift-wrap event IDs. NIP-59 randomizes
-/// gift-wrap timestamps, so DM subscriptions must look back generously (24h)
-/// and relays redeliver the same events on every launch — without a
-/// cross-launch record, each relaunch reprocesses old PMs and acks
+/// Disk persistence for processed private-envelope event IDs. BitChat
+/// randomizes envelope timestamps, so DM subscriptions must look back
+/// generously (24h) and relays redeliver the same events on every launch —
+/// without a cross-launch record, each relaunch reprocesses old PMs and acks
 /// (re-sent DELIVERED bursts, "delivered ack for unknown mid" noise).
 ///
 /// Contents are event IDs already visible to every relay, so

bitchat/Services/NostrTransport.swift

@@ -11,8 +11,12 @@ final class NostrTransport: Transport, @unchecked Sendable {
         let favoriteStatusForNoiseKey: @MainActor (Data) -> FavoritesPersistenceService.FavoriteRelationship?
         let favoriteStatusForPeerID: @MainActor (PeerID) -> FavoritesPersistenceService.FavoriteRelationship?
         let currentIdentity: @MainActor () throws -> NostrIdentity?
-        let registerPendingGiftWrap: @MainActor (String) -> Void
-        let sendEvent: @MainActor (NostrEvent) -> Void
+        let registerPendingPrivateEnvelope: @MainActor (String) -> Void
+        let sendPrivateEnvelopeBatch: @MainActor (
+            [NostrEvent],
+            @escaping @MainActor () -> Void
+        ) -> Bool
+        let envelopeRetryQueue: NostrPrivateEnvelopeRetryQueue
         /// Emits whether a relay that carries private messages is up
         /// (fail-closed behind Tor). A connected geohash/custom relay alone
         /// doesn't count: DM sends target the default relay set and would
@@ -22,25 +26,35 @@ final class NostrTransport: Transport, @unchecked Sendable {
         /// serialize behind each other; `live` passes the process-wide one.
         let ackPacer: AckPacer
 
+        @MainActor
         init(
             notificationCenter: NotificationCenter,
             loadFavorites: @escaping @MainActor () -> [Data: FavoritesPersistenceService.FavoriteRelationship],
             favoriteStatusForNoiseKey: @escaping @MainActor (Data) -> FavoritesPersistenceService.FavoriteRelationship?,
             favoriteStatusForPeerID: @escaping @MainActor (PeerID) -> FavoritesPersistenceService.FavoriteRelationship?,
             currentIdentity: @escaping @MainActor () throws -> NostrIdentity?,
-            registerPendingGiftWrap: @escaping @MainActor (String) -> Void,
-            sendEvent: @escaping @MainActor (NostrEvent) -> Void,
+            registerPendingPrivateEnvelope: @escaping @MainActor (String) -> Void,
+            sendPrivateEnvelopeBatch: @escaping @MainActor (
+                [NostrEvent],
+                @escaping @MainActor () -> Void
+            ) -> Bool,
             scheduleAfter: @escaping @Sendable (TimeInterval, @escaping @Sendable () -> Void) -> Void,
             relayConnectivity: @escaping @MainActor () -> AnyPublisher<Bool, Never>,
-            ackPacer: AckPacer? = nil
+            ackPacer: AckPacer? = nil,
+            envelopeRetryQueue: NostrPrivateEnvelopeRetryQueue? = nil
         ) {
             self.notificationCenter = notificationCenter
             self.loadFavorites = loadFavorites
             self.favoriteStatusForNoiseKey = favoriteStatusForNoiseKey
             self.favoriteStatusForPeerID = favoriteStatusForPeerID
             self.currentIdentity = currentIdentity
-            self.registerPendingGiftWrap = registerPendingGiftWrap
-            self.sendEvent = sendEvent
+            self.registerPendingPrivateEnvelope = registerPendingPrivateEnvelope
+            self.sendPrivateEnvelopeBatch = sendPrivateEnvelopeBatch
+            self.envelopeRetryQueue = envelopeRetryQueue ?? NostrPrivateEnvelopeRetryQueue(
+                sendPrivateEnvelopeBatch: sendPrivateEnvelopeBatch,
+                registerPendingPrivateEnvelope: registerPendingPrivateEnvelope,
+                scheduleAfter: scheduleAfter
+            )
             self.relayConnectivity = relayConnectivity
             // Default pacer drives its throttle through the same injected
             // scheduler, so tests that step scheduleAfter manually keep
@@ -56,13 +70,19 @@ final class NostrTransport: Transport, @unchecked Sendable {
                 favoriteStatusForNoiseKey: { FavoritesPersistenceService.shared.getFavoriteStatus(for: $0) },
                 favoriteStatusForPeerID: { FavoritesPersistenceService.shared.getFavoriteStatus(forPeerID: $0) },
                 currentIdentity: { try idBridge.getCurrentNostrIdentity() },
-                registerPendingGiftWrap: { NostrRelayManager.registerPendingGiftWrap(id: $0) },
-                sendEvent: { NostrRelayManager.shared.sendEvent($0) },
+                registerPendingPrivateEnvelope: { NostrRelayManager.registerPendingPrivateEnvelope(id: $0) },
+                sendPrivateEnvelopeBatch: { events, terminalFailure in
+                    NostrRelayManager.shared.sendPrivateEnvelopeBatch(
+                        events,
+                        terminalFailure: terminalFailure
+                    )
+                },
                 scheduleAfter: { delay, action in
                     DispatchQueue.main.asyncAfter(deadline: .now() + delay, execute: action)
                 },
                 relayConnectivity: { NostrRelayManager.shared.$isDMRelayConnected.eraseToAnyPublisher() },
-                ackPacer: NostrTransport.sharedAckPacer
+                ackPacer: NostrTransport.sharedAckPacer,
+                envelopeRetryQueue: NostrTransport.sharedEnvelopeRetryQueue
             )
         }
     }
@@ -128,7 +148,37 @@ final class NostrTransport: Transport, @unchecked Sendable {
         }
     }
     static let sharedAckPacer = AckPacer()
+    // Geohash acknowledgements use short-lived NostrTransport instances, so
+    // the retry owner must be process-wide. A per-transport cap would still be
+    // globally unbounded under outage as throwaway instances accumulated.
+    @MainActor
+    private static let sharedEnvelopeRetryQueue = NostrPrivateEnvelopeRetryQueue(
+        sendPrivateEnvelopeBatch: { events, terminalFailure in
+            NostrRelayManager.shared.sendPrivateEnvelopeBatch(
+                events,
+                terminalFailure: terminalFailure
+            )
+        },
+        registerPendingPrivateEnvelope: {
+            NostrRelayManager.registerPendingPrivateEnvelope(id: $0)
+        },
+        scheduleAfter: { delay, action in
+            DispatchQueue.main.asyncAfter(deadline: .now() + delay, execute: action)
+        }
+    )
+
+    @MainActor
+    static func resetControlRetriesForPanicWipe() {
+        sharedEnvelopeRetryQueue.removeAll()
+    }
+
+    private enum PrivateEnvelopeFailurePolicy {
+        case userMessage(messageID: String)
+        case retry(retryKey: String)
+    }
+
     private let dependencies: Dependencies
+    private let envelopeRetryQueue: NostrPrivateEnvelopeRetryQueue
     private var favoriteStatusObserver: NSObjectProtocol?
 
     // Reachability Cache (thread-safe)
@@ -145,7 +195,9 @@ final class NostrTransport: Transport, @unchecked Sendable {
         idBridge: NostrIdentityBridge,
         dependencies: Dependencies? = nil
     ) {
-        self.dependencies = dependencies ?? .live(idBridge: idBridge)
+        let resolvedDependencies = dependencies ?? .live(idBridge: idBridge)
+        self.dependencies = resolvedDependencies
+        self.envelopeRetryQueue = resolvedDependencies.envelopeRetryQueue
         
         setupObservers()
         
@@ -172,6 +224,18 @@ final class NostrTransport: Transport, @unchecked Sendable {
         }
     }
 
+    #if DEBUG
+    @MainActor
+    func debugEnqueueControlRetry(key: String, events: [NostrEvent]) {
+        envelopeRetryQueue.enqueue(key: key, events: events, registerPending: false)
+    }
+
+    @MainActor
+    var debugControlRetryCount: Int {
+        envelopeRetryQueue.debugPendingCount
+    }
+    #endif
+
     private func setupObservers() {
         favoriteStatusObserver = dependencies.notificationCenter.addObserver(
             forName: .favoriteStatusChanged,
@@ -253,15 +317,49 @@ final class NostrTransport: Transport, @unchecked Sendable {
 
     func sendPrivateMessage(_ content: String, to peerID: PeerID, recipientNickname: String, messageID: String) {
         Task { @MainActor in
-            guard let recipientNpub = resolveRecipientNpub(for: peerID),
-                  let recipientHex = npubToHex(recipientNpub),
-                  let senderIdentity = try? dependencies.currentIdentity() else { return }
+            let failurePolicy = PrivateEnvelopeFailurePolicy.userMessage(
+                messageID: messageID
+            )
+            guard let recipientNpub = resolveRecipientNpub(for: peerID) else {
+                handlePrivateEnvelopeFailure(
+                    events: [],
+                    registerPending: false,
+                    policy: failurePolicy
+                )
+                return
+            }
+            guard let recipientHex = npubToHex(recipientNpub) else {
+                handlePrivateEnvelopeFailure(
+                    events: [],
+                    registerPending: false,
+                    policy: failurePolicy
+                )
+                return
+            }
+            guard let senderIdentity = try? dependencies.currentIdentity() else {
+                handlePrivateEnvelopeFailure(
+                    events: [],
+                    registerPending: false,
+                    policy: failurePolicy
+                )
+                return
+            }
             SecureLogger.debug("NostrTransport: preparing PM to \(recipientNpub.prefix(16))… id=\(messageID.prefix(8))…", category: .session)
             guard let embedded = NostrEmbeddedBitChat.encodePMForNostr(content: content, messageID: messageID, recipientPeerID: peerID, senderPeerID: senderPeerID) else {
                 SecureLogger.error("NostrTransport: failed to embed PM packet", category: .session)
+                handlePrivateEnvelopeFailure(
+                    events: [],
+                    registerPending: false,
+                    policy: failurePolicy
+                )
                 return
             }
-            sendWrappedMessage(content: embedded, recipientHex: recipientHex, senderIdentity: senderIdentity)
+            sendPrivateEnvelope(
+                content: embedded,
+                recipientHex: recipientHex,
+                senderIdentity: senderIdentity,
+                failurePolicy: failurePolicy
+            )
         }
     }
 
@@ -287,7 +385,14 @@ final class NostrTransport: Transport, @unchecked Sendable {
                 SecureLogger.error("NostrTransport: failed to embed favorite notification", category: .session)
                 return
             }
-            sendWrappedMessage(content: embedded, recipientHex: recipientHex, senderIdentity: senderIdentity)
+            sendPrivateEnvelope(
+                content: embedded,
+                recipientHex: recipientHex,
+                senderIdentity: senderIdentity,
+                failurePolicy: .retry(
+                    retryKey: privateEnvelopeRetryKey(content: embedded, recipientHex: recipientHex)
+                )
+            )
         }
     }
 
@@ -311,16 +416,48 @@ extension NostrTransport {
     }
 
     // MARK: Geohash DMs (per-geohash identity)
-    func sendPrivateMessageGeohash(content: String, toRecipientHex recipientHex: String, from identity: NostrIdentity, messageID: String) {
-        Task { @MainActor in
-            guard !recipientHex.isEmpty else { return }
-            SecureLogger.debug("GeoDM: send PM mid=\(messageID.prefix(8))…", category: .session)
-            guard let embedded = NostrEmbeddedBitChat.encodePMForNostrNoRecipient(content: content, messageID: messageID, senderPeerID: senderPeerID) else {
-                SecureLogger.error("NostrTransport: failed to embed geohash PM packet", category: .session)
-                return
-            }
-            sendWrappedMessage(content: embedded, recipientHex: recipientHex, senderIdentity: identity, registerPending: true)
+    /// Returns true only when the complete migration pair entered the relay
+    /// delivery queue. GeoDM callers use this synchronous admission result
+    /// before showing "sent"; deterministic packet/envelope failures must not
+    /// be hidden behind an unobserved MainActor task.
+    @MainActor
+    @discardableResult
+    func sendPrivateMessageGeohash(
+        content: String,
+        toRecipientHex recipientHex: String,
+        from identity: NostrIdentity,
+        messageID: String
+    ) -> Bool {
+        let failurePolicy = PrivateEnvelopeFailurePolicy.userMessage(messageID: messageID)
+        guard !recipientHex.isEmpty else {
+            handlePrivateEnvelopeFailure(
+                events: [],
+                registerPending: false,
+                policy: failurePolicy
+            )
+            return false
         }
+        SecureLogger.debug("GeoDM: send PM mid=\(messageID.prefix(8))…", category: .session)
+        guard let embedded = NostrEmbeddedBitChat.encodePMForNostrNoRecipient(
+            content: content,
+            messageID: messageID,
+            senderPeerID: senderPeerID
+        ) else {
+            SecureLogger.error("NostrTransport: failed to embed geohash PM packet", category: .session)
+            handlePrivateEnvelopeFailure(
+                events: [],
+                registerPending: false,
+                policy: failurePolicy
+            )
+            return false
+        }
+        return sendPrivateEnvelope(
+            content: embedded,
+            recipientHex: recipientHex,
+            senderIdentity: identity,
+            registerPending: true,
+            failurePolicy: failurePolicy
+        )
     }
 }
 
@@ -340,17 +477,112 @@ extension NostrTransport {
         }
     }
 
-    /// Creates and sends a gift-wrapped private message event
+    /// Creates and sends a BitChat private-envelope event over Nostr.
     @MainActor
-    private func sendWrappedMessage(content: String, recipientHex: String, senderIdentity: NostrIdentity, registerPending: Bool = false) {
-        guard let event = try? NostrProtocol.createPrivateMessage(content: content, recipientPubkey: recipientHex, senderIdentity: senderIdentity) else {
-            SecureLogger.error("NostrTransport: failed to build Nostr event", category: .session)
-            return
+    @discardableResult
+    private func sendPrivateEnvelope(
+        content: String,
+        recipientHex: String,
+        senderIdentity: NostrIdentity,
+        registerPending: Bool = false,
+        failurePolicy: PrivateEnvelopeFailurePolicy
+    ) -> Bool {
+        let events: [NostrEvent]
+        do {
+            events = try NostrProtocol.createPrivateEnvelopePublicationBatch(
+                content: content,
+                recipientPubkey: recipientHex,
+                senderIdentity: senderIdentity
+            )
+        } catch {
+            SecureLogger.error(
+                "NostrTransport: failed to build Nostr private-envelope batch: \(error)",
+                category: .session
+            )
+            // Construction failures are deterministic. User-authored messages
+            // must become visibly failed; control payloads have no valid event
+            // pair to retain and retry.
+            handlePrivateEnvelopeFailure(
+                events: [],
+                registerPending: false,
+                policy: failurePolicy
+            )
+            return false
         }
-        if registerPending {
-            dependencies.registerPendingGiftWrap(event.id)
+        let accepted = dependencies.sendPrivateEnvelopeBatch(events) { [self] in
+            handlePrivateEnvelopeFailure(
+                events: events,
+                registerPending: registerPending,
+                policy: failurePolicy
+            )
+        }
+        guard accepted else {
+            SecureLogger.error(
+                "NostrTransport: private-envelope migration pair was not accepted for relay delivery",
+                category: .session
+            )
+            handlePrivateEnvelopeFailure(
+                events: events,
+                registerPending: registerPending,
+                policy: failurePolicy
+            )
+            return false
+        }
+        registerPendingPrivateEnvelopesIfNeeded(events, registerPending: registerPending)
+        return true
+    }
+
+    @MainActor
+    private func handlePrivateEnvelopeFailure(
+        events: [NostrEvent],
+        registerPending: Bool,
+        policy: PrivateEnvelopeFailurePolicy
+    ) {
+        switch policy {
+        case .userMessage(let messageID):
+            deliverTransportEvent(.messageDeliveryStatusUpdated(
+                messageID: messageID,
+                status: .failed(reason: String(
+                    localized: "content.delivery.reason.not_delivered",
+                    comment: "Failure reason shown when a private message could not enter the relay delivery queue"
+                ))
+            ))
+        case .retry(let retryKey):
+            // A deterministic packet/envelope construction failure has no
+            // events to retry. Only relay admission/delivery failures reach
+            // this branch with the complete atomic pair.
+            guard !events.isEmpty else { return }
+            envelopeRetryQueue.enqueue(
+                key: retryKey,
+                events: events,
+                registerPending: registerPending
+            )
+        }
+    }
+
+    @MainActor
+    private func registerPendingPrivateEnvelopesIfNeeded(
+        _ events: [NostrEvent],
+        registerPending: Bool
+    ) {
+        guard registerPending else { return }
+        for event in events {
+            dependencies.registerPendingPrivateEnvelope(event.id)
+        }
+    }
+
+    @MainActor
+    private func privateEnvelopeRetryKey(content: String, recipientHex: String) -> String {
+        "\(recipientHex.lowercased()):\(Data(content.utf8).sha256Fingerprint())"
+    }
+
+    @MainActor
+    private func deliverTransportEvent(_ event: TransportEvent) {
+        if let eventDelegate {
+            eventDelegate.didReceiveTransportEvent(event)
+        } else {
+            delegate?.receiveTransportEvent(event)
         }
-        dependencies.sendEvent(event)
     }
 
 
@@ -367,7 +599,14 @@ extension NostrTransport {
                     SecureLogger.error("NostrTransport: failed to embed READ ack", category: .session)
                     return
                 }
-                sendWrappedMessage(content: ack, recipientHex: recipientHex, senderIdentity: senderIdentity)
+                sendPrivateEnvelope(
+                    content: ack,
+                    recipientHex: recipientHex,
+                    senderIdentity: senderIdentity,
+                    failurePolicy: .retry(
+                        retryKey: privateEnvelopeRetryKey(content: ack, recipientHex: recipientHex)
+                    )
+                )
 
             case .deliveredDirect(let messageID, let peerID):
                 guard let recipientNpub = resolveRecipientNpub(for: peerID),
@@ -378,17 +617,40 @@ extension NostrTransport {
                     SecureLogger.error("NostrTransport: failed to embed DELIVERED ack", category: .session)
                     return
                 }
-                sendWrappedMessage(content: ack, recipientHex: recipientHex, senderIdentity: senderIdentity)
+                sendPrivateEnvelope(
+                    content: ack,
+                    recipientHex: recipientHex,
+                    senderIdentity: senderIdentity,
+                    failurePolicy: .retry(
+                        retryKey: privateEnvelopeRetryKey(content: ack, recipientHex: recipientHex)
+                    )
+                )
 
             case .deliveredGeohash(let messageID, let recipientHex, let identity):
                 SecureLogger.debug("GeoDM: send DELIVERED mid=\(messageID.prefix(8))…", category: .session)
                 guard let embedded = NostrEmbeddedBitChat.encodeAckForNostrNoRecipient(type: .delivered, messageID: messageID, senderPeerID: senderPeerID) else { return }
-                sendWrappedMessage(content: embedded, recipientHex: recipientHex, senderIdentity: identity, registerPending: true)
+                sendPrivateEnvelope(
+                    content: embedded,
+                    recipientHex: recipientHex,
+                    senderIdentity: identity,
+                    registerPending: true,
+                    failurePolicy: .retry(
+                        retryKey: privateEnvelopeRetryKey(content: embedded, recipientHex: recipientHex)
+                    )
+                )
 
             case .readGeohash(let messageID, let recipientHex, let identity):
                 SecureLogger.debug("GeoDM: send READ mid=\(messageID.prefix(8))…", category: .session)
                 guard let embedded = NostrEmbeddedBitChat.encodeAckForNostrNoRecipient(type: .readReceipt, messageID: messageID, senderPeerID: senderPeerID) else { return }
-                sendWrappedMessage(content: embedded, recipientHex: recipientHex, senderIdentity: identity, registerPending: true)
+                sendPrivateEnvelope(
+                    content: embedded,
+                    recipientHex: recipientHex,
+                    senderIdentity: identity,
+                    registerPending: true,
+                    failurePolicy: .retry(
+                        retryKey: privateEnvelopeRetryKey(content: embedded, recipientHex: recipientHex)
+                    )
+                )
             }
         }
     }
@@ -408,3 +670,122 @@ extension NostrTransport {
         return nil
     }
 }
+
+/// Bounded retry owner for non-user private control payloads. It is separate
+/// from `NostrTransport` so a scheduled retry from a short-lived geohash
+/// transport remains valid after that transport deinitializes. Scheduler
+/// callbacks retain this queue, never the transport; an evicted key simply
+/// becomes a harmless no-op when its already-scheduled callback fires.
+@MainActor
+final class NostrPrivateEnvelopeRetryQueue {
+    private struct PendingRetry {
+        let events: [NostrEvent]
+        let registerPending: Bool
+        var attempt: Int
+        var isScheduled: Bool
+    }
+
+    private let sendPrivateEnvelopeBatch: @MainActor (
+        [NostrEvent],
+        @escaping @MainActor () -> Void
+    ) -> Bool
+    private let registerPendingPrivateEnvelope: @MainActor (String) -> Void
+    private let scheduleAfter: @Sendable (
+        TimeInterval,
+        @escaping @Sendable () -> Void
+    ) -> Void
+    private var pending: [String: PendingRetry] = [:]
+    private var insertionOrder: [String] = []
+
+    init(
+        sendPrivateEnvelopeBatch: @escaping @MainActor (
+            [NostrEvent],
+            @escaping @MainActor () -> Void
+        ) -> Bool,
+        registerPendingPrivateEnvelope: @escaping @MainActor (String) -> Void,
+        scheduleAfter: @escaping @Sendable (
+            TimeInterval,
+            @escaping @Sendable () -> Void
+        ) -> Void
+    ) {
+        self.sendPrivateEnvelopeBatch = sendPrivateEnvelopeBatch
+        self.registerPendingPrivateEnvelope = registerPendingPrivateEnvelope
+        self.scheduleAfter = scheduleAfter
+    }
+
+    func enqueue(key: String, events: [NostrEvent], registerPending: Bool) {
+        guard pending[key] == nil else { return }
+        if pending.count >= TransportConfig.nostrPrivateEnvelopeRetryQueueCap,
+           let evictedKey = insertionOrder.first {
+            insertionOrder.removeFirst()
+            pending.removeValue(forKey: evictedKey)
+            // These are control payloads, never user-authored messages. Keep
+            // the bounded-loss decision explicit rather than silently growing
+            // memory during a prolonged outage.
+            SecureLogger.warning(
+                "📮 Private control retry queue full — evicted oldest whole migration pair",
+                category: .session
+            )
+        }
+        pending[key] = PendingRetry(
+            events: events,
+            registerPending: registerPending,
+            attempt: 0,
+            isScheduled: false
+        )
+        insertionOrder.append(key)
+        schedule(key: key)
+    }
+
+    private func schedule(key: String) {
+        guard var item = pending[key], !item.isScheduled else { return }
+        item.isScheduled = true
+        pending[key] = item
+        let exponent = min(item.attempt, 5)
+        let delay = min(2.0 * pow(2.0, Double(exponent)), 60.0)
+        scheduleAfter(delay) { [self] in
+            Task { @MainActor [self] in
+                self.retry(key: key)
+            }
+        }
+    }
+
+    private func retry(key: String) {
+        guard var item = pending[key] else { return }
+        item.isScheduled = false
+        pending[key] = item
+
+        let accepted = sendPrivateEnvelopeBatch(item.events) { [self] in
+            self.enqueue(
+                key: key,
+                events: item.events,
+                registerPending: item.registerPending
+            )
+        }
+        if accepted {
+            remove(key: key)
+            if item.registerPending {
+                for event in item.events {
+                    registerPendingPrivateEnvelope(event.id)
+                }
+            }
+        } else {
+            item.attempt += 1
+            pending[key] = item
+            schedule(key: key)
+        }
+    }
+
+    private func remove(key: String) {
+        pending.removeValue(forKey: key)
+        insertionOrder.removeAll { $0 == key }
+    }
+
+    func removeAll() {
+        pending.removeAll()
+        insertionOrder.removeAll()
+    }
+
+    var debugPendingCount: Int { pending.count }
+    func debugContains(key: String) -> Bool { pending[key] != nil }
+}

bitchat/Services/Transport.swift

@@ -97,6 +97,19 @@ enum PrivateMediaSendPolicy: Equatable {
     case blockedDowngrade
 }
 
+/// Receiver-only persistence surface for explicit private-media deletion.
+/// Kept separate from `Transport` so sender retry branches can rebase without
+/// inheriting or implementing receiver storage concerns.
+protocol PrivateMediaDeletionPersisting: AnyObject {
+    @MainActor
+    func persistDeletedPrivateMedia(
+        messageIDs: [String],
+        payloadRelativePaths: [String: String],
+        protectedPayloadRelativePaths: Set<String>,
+        completion: @escaping @MainActor (Bool) -> Void
+    )
+}
+
 protocol TransportEventDelegate: AnyObject {
     @MainActor func didReceiveTransportEvent(_ event: TransportEvent)
 }
@@ -190,6 +203,14 @@ protocol Transport: AnyObject {
         transferId: String,
         allowLegacyFallback: Bool
     )
+    /// Automatic whole-file retry is admitted only while this exact Noise
+    /// generation authenticates bit 9. It must never queue across a session
+    /// replacement or enter the signed raw legacy path.
+    func sendFilePrivateReceiptRetry(
+        _ packet: BitchatFilePacket,
+        to peerID: PeerID,
+        transferId: String
+    )
     func cancelTransfer(_ transferId: String)
 
     // Live voice / push-to-talk (mesh transports only): one encoded
@@ -236,6 +257,11 @@ protocol Transport: AnyObject {
     /// empty for peers that predate the capabilities TLV.
     func peerCapabilities(_ peerID: PeerID) -> PeerCapabilities
     func privateMediaSendPolicy(to peerID: PeerID) -> PrivateMediaSendPolicy
+    /// The exact current Noise generation that authenticated both encrypted
+    /// private media (bit 8) and durable receipts/retry (bit 9).
+    func authenticatedPrivateMediaReceiptSessionGeneration(
+        to peerID: PeerID
+    ) -> UUID?
     func resolvePrivateMediaSendPolicy(
         to peerID: PeerID,
         completion: @escaping @MainActor (PrivateMediaSendPolicy) -> Void
@@ -311,6 +337,11 @@ extension Transport {
     func broadcastGroupMessage(_ envelope: Data) {}
     func peerCapabilities(_ peerID: PeerID) -> PeerCapabilities { [] }
     func privateMediaSendPolicy(to peerID: PeerID) -> PrivateMediaSendPolicy { .blockedDowngrade }
+    func authenticatedPrivateMediaReceiptSessionGeneration(
+        to peerID: PeerID
+    ) -> UUID? {
+        nil
+    }
     func resolvePrivateMediaSendPolicy(
         to peerID: PeerID,
         completion: @escaping @MainActor (PrivateMediaSendPolicy) -> Void
@@ -345,6 +376,11 @@ extension Transport {
         guard !allowLegacyFallback else { return }
         sendFilePrivate(packet, to: peerID, transferId: transferId)
     }
+    func sendFilePrivateReceiptRetry(
+        _ packet: BitchatFilePacket,
+        to peerID: PeerID,
+        transferId: String
+    ) {}
     func cancelTransfer(_ transferId: String) {}
 
     func sendMessage(_ content: String, mentions: [String], messageID: String, timestamp: Date) {

bitchat/Services/TransportConfig.swift

@@ -195,7 +195,22 @@ enum TransportConfig {
     static let nostrGeoRelayCount: Int = 5
     static let nostrGeohashSampleLookbackSeconds: TimeInterval = 300
     static let nostrGeohashSampleLimit: Int = 100
-    static let nostrDMSubscribeLookbackSeconds: TimeInterval = 86400
+    /// New iOS public-envelope timestamps are deliberately shifted into the
+    /// past for privacy and relay compatibility.
+    static let nostrPrivateEnvelopeTimestampFuzzSeconds: TimeInterval = 15 * 60
+    /// Deployed Android clients can shift legacy kind-1059 timestamps by the
+    /// full preceding 48 hours.
+    static let nostrLegacyAndroidTimestampFuzzSeconds: TimeInterval = 48 * 60 * 60
+    /// Private mail remains eligible for delivery for the same 24-hour window
+    /// as the persistent sender outbox. The relay query must add timestamp
+    /// randomization to that window rather than replacing it: an Android event
+    /// sent at t0 can legitimately be stamped t0-48h and fetched at t0+24h.
+    static let nostrPrivateEnvelopeDeliveryWindowSeconds: TimeInterval = 24 * 60 * 60
+    static let nostrDMSubscribeClockSkewSeconds: TimeInterval = 15 * 60
+    static let nostrDMSubscribeLookbackSeconds: TimeInterval =
+        nostrPrivateEnvelopeDeliveryWindowSeconds
+        + nostrLegacyAndroidTimestampFuzzSeconds
+        + nostrDMSubscribeClockSkewSeconds
     // A sampled chat message this recent means "a conversation is happening
     // there" for the empty-timeline nearby-activity hint.
     static let uiGeohashChatActivityWindowSeconds: TimeInterval = 900
@@ -223,11 +238,20 @@ enum TransportConfig {
     // Reconnect delays get ±20% random jitter so relays that dropped together
     // (e.g. a network blip) don't thundering-herd the same reconnect instant.
     static let nostrRelayBackoffJitterRatio: Double = 0.2
-    static let nostrRelayDefaultFetchLimit: Int = 100
+    /// Migration recovery uses one independent relay filter per wire kind so
+    /// primary traffic cannot consume the legacy result budget (or vice
+    /// versa). Five hundred per kind bounds startup work while preserving a
+    /// materially deeper offline mailbox than the generic feed default.
+    static let nostrPrivateEnvelopeFetchLimitPerKind: Int = 500
     // How many consecutive Tor-readiness waits (each bounded by TorManager's
     // bootstrap deadline) to attempt before unblocking pending EOSE callers.
     static let nostrTorReadyMaxWaitAttempts: Int = 3
     static let nostrPendingSendQueueCap: Int = 200
+    /// Control-payload pairs (delivery/read acknowledgements and favorite
+    /// notifications) that could not enter the relay queue. User messages do
+    /// not use this queue: they fail visibly, while direct messages also
+    /// remain in the router outbox.
+    static let nostrPrivateEnvelopeRetryQueueCap: Int = 256
     // Sample interval for the send-queue overflow warning (first + every Nth
     // dropped event). Drops are ephemeral presence/geo traffic — log-only.
     static let nostrPendingSendDropLogInterval: Int = 10
@@ -239,7 +263,7 @@ enum TransportConfig {
     // Fallback deadline for treating a subscription's initial fetch as complete
     // when a relay never sends EOSE (generous to cover Tor circuit setup).
     static let nostrSubscriptionEOSEFallbackSeconds: TimeInterval = 10.0
-    // A bridge drop is durable only after NIP-20 OK. Relays that omit OK must
+    // A bridge drop is durable only after NIP-01 `OK`. Relays that omit `OK` must
     // not pin the router's in-flight state indefinitely.
     static let nostrConfirmedSendAckTimeoutSeconds: TimeInterval = 10.0
     // After this long, a relay marked permanently failed gets another chance.

bitchat/ViewModels/ChatDeliveryCoordinator.swift

@@ -55,6 +55,9 @@ extension ChatViewModel: ChatDeliveryContext {
 
     func markMessageDelivered(_ messageID: String) {
         messageRouter.markDelivered(messageID)
+        mediaTransferCoordinator.confirmPrivateMediaDelivery(
+            messageID: messageID
+        )
     }
 }
 

bitchat/ViewModels/ChatPrivateConversationCoordinator.swift

@@ -86,7 +86,13 @@ protocol ChatPrivateConversationContext: AnyObject {
     @discardableResult
     func routeReadReceipt(_ receipt: ReadReceipt, to peerID: PeerID) -> Bool
     func sendMeshReadReceipt(_ receipt: ReadReceipt, to peerID: PeerID)
-    func sendGeohashPrivateMessage(_ content: String, toRecipientHex recipientHex: String, from identity: NostrIdentity, messageID: String)
+    @discardableResult
+    func sendGeohashPrivateMessage(
+        _ content: String,
+        toRecipientHex recipientHex: String,
+        from identity: NostrIdentity,
+        messageID: String
+    ) -> Bool
     func sendGeohashDeliveryAck(for messageID: String, toRecipientHex recipientHex: String, from identity: NostrIdentity)
     func sendGeohashReadReceipt(_ messageID: String, toRecipientHex recipientHex: String, from identity: NostrIdentity)
 
@@ -174,7 +180,13 @@ extension ChatViewModel: ChatPrivateConversationContext {
         meshService.sendReadReceipt(receipt, to: peerID)
     }
 
-    func sendGeohashPrivateMessage(_ content: String, toRecipientHex recipientHex: String, from identity: NostrIdentity, messageID: String) {
+    @discardableResult
+    func sendGeohashPrivateMessage(
+        _ content: String,
+        toRecipientHex recipientHex: String,
+        from identity: NostrIdentity,
+        messageID: String
+    ) -> Bool {
         makeGeohashNostrTransport().sendPrivateMessageGeohash(
             content: content,
             toRecipientHex: recipientHex,
@@ -216,9 +228,16 @@ extension ChatViewModel: ChatPrivateConversationContext {
         NotificationService.shared.sendPrivateMessageNotification(from: senderName, message: message, peerID: peerID)
     }
 
-    private func makeGeohashNostrTransport() -> NostrTransport {
-        let transport = NostrTransport(keychain: keychain, idBridge: idBridge)
+    func makeGeohashNostrTransport(
+        dependencies: NostrTransport.Dependencies? = nil
+    ) -> NostrTransport {
+        let transport = NostrTransport(
+            keychain: keychain,
+            idBridge: idBridge,
+            dependencies: dependencies
+        )
         transport.senderPeerID = meshService.myPeerID
+        transport.eventDelegate = self
         return transport
     }
 }
@@ -227,7 +246,7 @@ extension ChatViewModel: ChatPrivateConversationContext {
 final class ChatPrivateConversationCoordinator {
     private unowned let context: any ChatPrivateConversationContext
 
-    // Outbox retries re-wrap the same message in fresh gift-wrap events, so
+    // Outbox retries re-envelope the same message in fresh private events, so
     // relay-level event-ID dedup can't catch them; track inbound GeoDM
     // message IDs so each copy past the first costs one (already-deduped)
     // ack check and nothing else.
@@ -399,13 +418,21 @@ final class ChatPrivateConversationCoordinator {
                 "GeoDM: local send mid=\(messageID.prefix(8))… to=\(recipientHex.prefix(8))… conv=\(peerID)",
                 category: .session
             )
-            context.sendGeohashPrivateMessage(
+            let accepted = context.sendGeohashPrivateMessage(
                 content,
                 toRecipientHex: recipientHex,
                 from: identity,
                 messageID: messageID
             )
-            context.setPrivateDeliveryStatus(.sent, forMessageID: messageID, peerID: peerID)
+            let status: DeliveryStatus = accepted
+                ? .sent
+                : .failed(
+                    reason: String(
+                        localized: "content.delivery.reason.not_delivered",
+                        comment: "Failure reason shown when a private message could not enter the relay delivery queue"
+                    )
+                )
+            context.setPrivateDeliveryStatus(status, forMessageID: messageID, peerID: peerID)
         } catch {
             context.setPrivateDeliveryStatus(
                 .failed(

bitchat/ViewModels/ChatVerificationCoordinator.swift

@@ -58,6 +58,7 @@ protocol ChatVerificationContext: AnyObject {
     func noiseStaticPublicKeyData() -> Data
     func hasEstablishedNoiseSession(with peerID: PeerID) -> Bool
     func triggerHandshake(with peerID: PeerID)
+    func privateMediaPeerDidAuthenticate(_ peerID: PeerID)
     func sendVerifyChallenge(to peerID: PeerID, noiseKeyHex: String, nonceA: Data)
     func sendVerifyResponse(to peerID: PeerID, noiseKeyHex: String, nonceA: Data)
 
@@ -116,6 +117,10 @@ extension ChatViewModel: ChatVerificationContext {
         meshService.noiseStaticPublicKeyData()
     }
 
+    func privateMediaPeerDidAuthenticate(_ peerID: PeerID) {
+        mediaTransferCoordinator.peerDidAuthenticate(peerID.toShort())
+    }
+
     func sendVerifyChallenge(to peerID: PeerID, noiseKeyHex: String, nonceA: Data) {
         meshService.sendVerifyChallenge(to: peerID, noiseKeyHex: noiseKeyHex, nonceA: nonceA)
     }
@@ -129,6 +134,10 @@ extension ChatViewModel: ChatVerificationContext {
     }
 }
 
+extension ChatVerificationContext {
+    func privateMediaPeerDidAuthenticate(_ peerID: PeerID) {}
+}
+
 @MainActor
 final class ChatVerificationCoordinator {
     struct PendingVerification {
@@ -197,6 +206,7 @@ final class ChatVerificationCoordinator {
                     guard let self else { return }
 
                     SecureLogger.debug("🔐 Authenticated: \(peerID)", category: .security)
+                    self.context.privateMediaPeerDidAuthenticate(peerID)
 
                     if self.context.isVerifiedFingerprint(fingerprint) {
                         self.context.setEncryptionStatus(.noiseVerified, for: peerID)

bitchat/ViewModels/ChatViewModel.swift

@@ -109,6 +109,16 @@ struct PanicNetworkLifecycle {
     }
 }
 
+private struct PendingPrivateChatClear {
+    let peerID: PeerID
+    let sourceConversationID: ConversationID
+    let messages: [BitchatMessage]
+    let otherMessageIDs: Set<String>
+    let localPeerID: PeerID
+    let nickname: String
+    let outgoingMedia: [BitchatMessage]
+}
+
 /// Manages the application state and business logic for BitChat.
 /// Acts as the primary coordinator between UI components and backend services,
 /// implementing the BitchatDelegate protocol to handle network events.
@@ -376,6 +386,11 @@ final class ChatViewModel: ObservableObject, BitchatDelegate, SynchronousMessage
     @Published var bluetoothAlertMessage = ""
     @Published var bluetoothState: CBManagerState = .unknown
     @Published private(set) var legacyPrivateMediaConsentRequest: LegacyPrivateMediaConsentRequest?
+    @MainActor private var queuedPrivateChatClears: [
+        PendingPrivateChatClear
+    ] = []
+    @MainActor private var privateChatClearInFlight = false
+    @MainActor private var privateChatClearGeneration: UInt64 = 0
     private var pendingLegacyPrivateMediaConsents: [PendingLegacyPrivateMediaConsent] = []
 
     private func performDeliveryUpdate(_ update: @escaping @MainActor (ChatDeliveryCoordinator) -> Void) {
@@ -643,7 +658,271 @@ final class ChatViewModel: ObservableObject, BitchatDelegate, SynchronousMessage
     /// Empties the peer's chat but keeps the conversation alive (`/clear`).
     @MainActor
     func clearPrivateChat(_ peerID: PeerID) {
-        conversations.clear(.directPeer(peerID))
+        let sourceConversationID = ConversationID.directPeer(peerID)
+        // An active live-voice row owns an open FileHandle and may be
+        // republished as frames/final media arrive. Treat it like an in-flight
+        // arrival rather than unlinking its capture or removing its bubble.
+        let messages = privateMessages(for: peerID).filter {
+            !liveVoiceCoordinator.isLiveVoiceMessage($0)
+        }
+        let localPeerID = meshService.myPeerID.toShort()
+        let currentNickname = nickname
+        let mediaPrefixes = [
+            MimeType.Category.audio.messagePrefix,
+            MimeType.Category.image.messagePrefix,
+            MimeType.Category.file.messagePrefix
+        ]
+        let outgoingMedia = messages.filter { message in
+            guard mediaPrefixes.contains(where: {
+                message.content.hasPrefix($0)
+            }) else {
+                return false
+            }
+            if let senderPeerID = message.senderPeerID {
+                return senderPeerID.toShort() == localPeerID
+            }
+            return message.sender == currentNickname
+                || message.sender.hasPrefix(currentNickname + "#")
+        }
+
+        // Send ownership is canceled at command time even when another clear
+        // transaction is ahead in the queue. UI and files remain untouched
+        // until this request's receiver journal commit succeeds.
+        for message in outgoingMedia {
+            mediaTransferCoordinator
+                .cancelMediaTransferForConversationClear(
+                    messageID: message.id
+                )
+        }
+
+        queuedPrivateChatClears.append(PendingPrivateChatClear(
+            peerID: peerID,
+            sourceConversationID: sourceConversationID,
+            messages: messages,
+            otherMessageIDs: Set(
+                privateChats
+                    .filter { $0.key != peerID }
+                    .flatMap { $0.value.map(\.id) }
+            ),
+            localPeerID: localPeerID,
+            nickname: currentNickname,
+            outgoingMedia: outgoingMedia
+        ))
+        startNextPrivateChatClearIfNeeded()
+    }
+
+    @MainActor
+    private func startNextPrivateChatClearIfNeeded() {
+        guard !privateChatClearInFlight,
+              !queuedPrivateChatClears.isEmpty else {
+            return
+        }
+        privateChatClearInFlight = true
+        let request = queuedPrivateChatClears.removeFirst()
+        let generation = privateChatClearGeneration
+        performPrivateChatClear(
+            request,
+            generation: generation
+        ) { [weak self] in
+            guard let self,
+                  self.privateChatClearGeneration == generation else {
+                return
+            }
+            self.privateChatClearInFlight = false
+            self.startNextPrivateChatClearIfNeeded()
+        }
+    }
+
+    @MainActor
+    private func performPrivateChatClear(
+        _ request: PendingPrivateChatClear,
+        generation: UInt64,
+        completion: @escaping @MainActor () -> Void
+    ) {
+        guard privateChatClearGeneration == generation else {
+            completion()
+            return
+        }
+        let peerID = request.peerID
+        let selectedConversationID = request.sourceConversationID
+        let messagesToClear = request.messages
+        guard !messagesToClear.isEmpty else {
+            completion()
+            return
+        }
+
+        // Capture the transaction's exact UI set before any off-main receipt
+        // I/O. Messages arriving while the journal is written are not part of
+        // this command and must remain visible.
+        let capturedMessageIDs = Set(messagesToClear.map(\.id))
+        let survivingMessageIDs = request.otherMessageIDs
+        let mediaPrefixes = [
+            MimeType.Category.audio.messagePrefix,
+            MimeType.Category.image.messagePrefix,
+            MimeType.Category.file.messagePrefix
+        ]
+        let localPeerID = request.localPeerID
+        let isMedia: (BitchatMessage) -> Bool = { message in
+            mediaPrefixes.contains(where: message.content.hasPrefix)
+        }
+        let isFromMe: (BitchatMessage) -> Bool = { [nickname = request.nickname] message in
+            if let senderPeerID = message.senderPeerID {
+                return senderPeerID.toShort() == localPeerID
+            }
+            return message.sender == nickname
+                || message.sender.hasPrefix(nickname + "#")
+        }
+
+        let outgoingMedia = request.outgoingMedia
+        let outgoingMediaIDs = Set(outgoingMedia.map(\.id))
+
+        let capturedExclusiveIDs =
+            capturedMessageIDs.subtracting(survivingMessageIDs)
+        let capturedIncomingMedia = messagesToClear.filter {
+            isMedia($0) && !isFromMe($0)
+        }
+        let capturedStableMediaIDs = Set(
+            capturedIncomingMedia.compactMap { message in
+                PrivateMediaMessageIdentity.isStableID(message.id)
+                    ? message.id
+                    : nil
+            }
+        )
+
+        func currentRemovalPlan() -> [ConversationID: Set<String>] {
+            // Identity handoff removes the source conversation and inserts its
+            // rows elsewhere. The old source may then be recreated by a new
+            // arrival before journal I/O finishes, so always scan all direct
+            // conversations. Only IDs exclusive at command time may follow a
+            // migration; shared aliases remain outside the source.
+            var plan: [ConversationID: Set<String>] = [:]
+            for (conversationID, conversation) in
+                conversations.conversationsByID {
+                guard case .direct = conversationID else { continue }
+                let eligibleIDs = conversationID == selectedConversationID
+                    ? capturedMessageIDs
+                    : capturedExclusiveIDs
+                let matchingIDs = Set(conversation.messages.map(\.id))
+                    .intersection(eligibleIDs)
+                if !matchingIDs.isEmpty {
+                    plan[conversationID] = matchingIDs
+                }
+            }
+            return plan
+        }
+
+        func hasRemainingCopy(
+            of messageID: String,
+            after plan: [ConversationID: Set<String>]
+        ) -> Bool {
+            conversations.conversationsByID.contains { conversationID, conversation in
+                guard case .direct = conversationID else { return false }
+                return conversation.messages.contains { message in
+                    message.id == messageID
+                        && plan[conversationID]?.contains(messageID) != true
+                }
+            }
+        }
+
+        @MainActor
+        func continueClear(
+            persisted: Bool,
+            durableStableIDs: Set<String>
+        ) {
+            guard privateChatClearGeneration == generation else {
+                completion()
+                return
+            }
+            guard persisted else {
+                SecureLogger.error(
+                    "Refusing to clear private chat without durable media tombstones peer=\(peerID.id.prefix(8))…",
+                    category: .session
+                )
+                completion()
+                return
+            }
+
+            let plan = currentRemovalPlan()
+            let newlyLastStableIDs = Set(
+                capturedStableMediaIDs.filter {
+                    !durableStableIDs.contains($0)
+                        && !hasRemainingCopy(of: $0, after: plan)
+                }
+            )
+            if !newlyLastStableIDs.isEmpty {
+                persistDeletedPrivateMedia(
+                    messageIDs: Array(newlyLastStableIDs).sorted()
+                ) { persisted in
+                    continueClear(
+                        persisted: persisted,
+                        durableStableIDs:
+                            durableStableIDs.union(newlyLastStableIDs)
+                    )
+                }
+                return
+            }
+
+            // A stable receiver tombstone is global for that message ID.
+            // Remove any alias that arrived while journal I/O was in flight.
+            if !durableStableIDs.isEmpty {
+                let directConversationIDs = conversations
+                    .conversationsByID.keys.filter {
+                        if case .direct = $0 { return true }
+                        return false
+                    }
+                for conversationID in directConversationIDs {
+                    conversations.removeMessages(from: conversationID) {
+                        durableStableIDs.contains($0.id)
+                    }
+                }
+            }
+
+            for message in outgoingMedia {
+                mediaTransferCoordinator.cleanupOutgoingLocalFile(
+                    forMessage: message
+                )
+            }
+            if !outgoingMediaIDs.isEmpty {
+                let directConversationIDs = conversations
+                    .conversationsByID.keys.filter {
+                        if case .direct = $0 { return true }
+                        return false
+                    }
+                for conversationID in directConversationIDs {
+                    conversations.removeMessages(from: conversationID) {
+                        outgoingMediaIDs.contains($0.id)
+                    }
+                }
+            }
+
+            // Stable payload cleanup belongs entirely to the durable receiver
+            // journal. Legacy/raw incoming payloads have no durable identity,
+            // so their basenames may already belong to a pending new arrival;
+            // leave those files for bounded quota cleanup.
+            let finalPlan = currentRemovalPlan()
+
+            for (conversationID, messageIDs) in finalPlan {
+                conversations.removeMessages(from: conversationID) {
+                    messageIDs.contains($0.id)
+                }
+            }
+            completion()
+        }
+
+        let initialPlan = currentRemovalPlan()
+        let initialStableIDs = Set(
+            capturedStableMediaIDs.filter {
+                !hasRemainingCopy(of: $0, after: initialPlan)
+            }
+        )
+        persistDeletedPrivateMedia(
+            messageIDs: Array(initialStableIDs).sorted()
+        ) { persisted in
+            continueClear(
+                persisted: persisted,
+                durableStableIDs: initialStableIDs
+            )
+        }
     }
 
     /// Removes the peer's chat entirely, including unread state.
@@ -1275,6 +1554,9 @@ final class ChatViewModel: ObservableObject, BitchatDelegate, SynchronousMessage
         // handles before clearing state or removing the media directory.
         mediaTransferCoordinator.resetForPanic()
         liveVoiceCoordinator.resetForPanic()
+        privateChatClearGeneration &+= 1
+        queuedPrivateChatClears.removeAll(keepingCapacity: false)
+        privateChatClearInFlight = false
 
         // Deny and release any clear-media confirmations before identities,
         // message state, and local files are wiped.
@@ -1372,6 +1654,7 @@ final class ChatViewModel: ObservableObject, BitchatDelegate, SynchronousMessage
         // Drop relay subscriptions, handlers, pending sends, and replay state.
         // Geohash DM handlers can capture pre-wipe Nostr identities, so a plain
         // disconnect is not enough here.
+        NostrTransport.resetControlRetriesForPanicWipe()
         NostrRelayManager.shared.resetForPanicWipe()
         nostrRelayManager = nil
 
@@ -1755,6 +2038,7 @@ final class ChatViewModel: ObservableObject, BitchatDelegate, SynchronousMessage
 
         case .peerConnected(let peerID):
             transportEventCoordinator.didConnectToPeerSynchronously(peerID)
+            mediaTransferCoordinator.peerDidReconnect(peerID)
 
         case .peerDisconnected(let peerID):
             transportEventCoordinator.didDisconnectFromPeerSynchronously(peerID)
@@ -1844,6 +2128,9 @@ final class ChatViewModel: ObservableObject, BitchatDelegate, SynchronousMessage
 
     func didConnectToPeer(_ peerID: PeerID) {
         transportEventCoordinator.didConnectToPeer(peerID)
+        Task { @MainActor [weak self] in
+            self?.mediaTransferCoordinator.peerDidReconnect(peerID)
+        }
     }
 
     func didDisconnectFromPeer(_ peerID: PeerID) {

bitchat/ViewModels/ChatViewModelBootstrapper.swift

@@ -41,10 +41,11 @@ struct ChatViewModelServiceBundle {
         self.privateChatManager = privateChatManager
         self.unifiedPeerService = unifiedPeerService
         self.autocompleteService = AutocompleteService()
-        // Persist processed gift-wrap event IDs: NIP-59 randomizes their
-        // timestamps, so the 24h-lookback DM subscriptions redeliver the same
-        // events on every launch and only a cross-launch record stops the
-        // reprocessing (re-sent DELIVERED bursts, phantom-ack noise).
+        // Persist processed private-envelope event IDs: legacy Android can
+        // randomize timestamps across the full 72h15m mailbox lookback, so DM
+        // subscriptions redeliver the same events on every launch and only a
+        // cross-launch record stops the reprocessing (re-sent DELIVERED
+        // bursts, phantom-ack noise).
         self.deduplicationService = MessageDeduplicationService(nostrEventStore: NostrProcessedEventStore())
         self.publicMessagePipeline = PublicMessagePipeline()
     }
@@ -176,7 +177,7 @@ private extension ChatViewModelBootstrapper {
 
     func configureTransport() {
         viewModel.meshService.delegate = viewModel
-        viewModel.meshService.eventDelegate = viewModel
+        viewModel.messageRouter.setEventDelegate(viewModel)
 
         DispatchQueue.main.asyncAfter(deadline: .now() + TransportConfig.uiStartupInitialDelaySeconds) { [weak viewModel] in
             guard let viewModel else { return }
@@ -558,7 +559,7 @@ private extension ChatViewModelBootstrapper {
             // Default (DM) relays: drops need the standing global relay set,
             // not geo relays — sender and recipient share no cell.
             // This confirmed path never falls back to the volatile relay
-            // queue; bridge dedup is committed only after NIP-20 OK.
+            // queue; bridge dedup is committed only after NIP-01 `OK`.
             NostrRelayManager.shared.sendEventImmediately(event, completion: completion)
         }
         courier.openSubscription = { tagsHex in

bitchat/ViewModels/Extensions/ChatViewModel+Nostr.swift

@@ -21,8 +21,8 @@ extension ChatViewModel {
     }
 
     @MainActor
-    func subscribeGiftWrap(_ giftWrap: NostrEvent, id: NostrIdentity) {
-        nostrCoordinator.inbound.subscribeGiftWrap(giftWrap, id: id)
+    func subscribePrivateEnvelope(_ envelope: NostrEvent, id: NostrIdentity) {
+        nostrCoordinator.inbound.subscribePrivateEnvelope(envelope, id: id)
     }
 
     @MainActor
@@ -36,8 +36,8 @@ extension ChatViewModel {
     }
 
     @MainActor
-    func handleGiftWrap(_ giftWrap: NostrEvent, id: NostrIdentity) {
-        nostrCoordinator.inbound.handleGiftWrap(giftWrap, id: id)
+    func handlePrivateEnvelope(_ envelope: NostrEvent, id: NostrIdentity) {
+        nostrCoordinator.inbound.handlePrivateEnvelope(envelope, id: id)
     }
 
     @MainActor

bitchat/ViewModels/GeohashSubscriptionManager.swift

@@ -108,7 +108,7 @@ extension ChatViewModel: GeohashSubscriptionContext {
 }
 
 /// Owns subscription IDs and relay lifecycle for geohash channels, geohash
-/// DMs, the account gift-wrap mailbox, and background geohash sampling. The
+/// DMs, the account private-envelope mailbox, and background geohash sampling. The
 /// only component that talks to `NostrRelayManager`; inbound events are
 /// forwarded to `NostrInboundPipeline` / `GeoPresenceTracker`.
 final class GeohashSubscriptionManager {
@@ -162,13 +162,13 @@ final class GeohashSubscriptionManager {
         if let identity = try? context.deriveNostrIdentity(forGeohash: channel.geohash) {
             let dmSub = "geo-dm-\(channel.geohash)"
             context.setGeoDmSubscriptionID(dmSub)
-            let dmFilter = NostrFilter.giftWrapsFor(
+            let dmFilters = NostrFilter.privateEnvelopeFiltersFor(
                 pubkey: identity.publicKeyHex,
                 since: Date().addingTimeInterval(-TransportConfig.nostrDMSubscribeLookbackSeconds)
             )
-            NostrRelayManager.shared.subscribe(filter: dmFilter, id: dmSub) { [weak self] giftWrap in
+            NostrRelayManager.shared.subscribe(filters: dmFilters, id: dmSub) { [weak self] envelope in
                 Task { @MainActor [weak self] in
-                    self?.inbound.subscribeGiftWrap(giftWrap, id: identity)
+                    self?.inbound.subscribePrivateEnvelope(envelope, id: identity)
                 }
             }
         }
@@ -260,13 +260,13 @@ final class GeohashSubscriptionManager {
         if TorManager.shared.isReady {
             SecureLogger.debug("GeoDM: subscribing DMs pub=\(identity.publicKeyHex.prefix(8))… sub=\(dmSub)", category: .session)
         }
-        let dmFilter = NostrFilter.giftWrapsFor(
+        let dmFilters = NostrFilter.privateEnvelopeFiltersFor(
             pubkey: identity.publicKeyHex,
             since: Date().addingTimeInterval(-TransportConfig.nostrDMSubscribeLookbackSeconds)
         )
-        NostrRelayManager.shared.subscribe(filter: dmFilter, id: dmSub) { [weak self] giftWrap in
+        NostrRelayManager.shared.subscribe(filters: dmFilters, id: dmSub) { [weak self] envelope in
             Task { @MainActor [weak self] in
-                self?.inbound.handleGiftWrap(giftWrap, id: identity)
+                self?.inbound.handlePrivateEnvelope(envelope, id: identity)
             }
         }
     }
@@ -388,14 +388,14 @@ final class GeohashSubscriptionManager {
             category: .session
         )
 
-        let filter = NostrFilter.giftWrapsFor(
+        let filters = NostrFilter.privateEnvelopeFiltersFor(
             pubkey: currentIdentity.publicKeyHex,
             since: Date().addingTimeInterval(-TransportConfig.nostrDMSubscribeLookbackSeconds)
         )
 
-        context.nostrRelayManager?.subscribe(filter: filter, id: "chat-messages") { [weak self] event in
+        context.nostrRelayManager?.subscribe(filters: filters, id: "chat-messages") { [weak self] event in
             Task { @MainActor [weak self] in
-                self?.inbound.handleNostrMessage(event)
+                self?.inbound.handleAccountPrivateEnvelope(event)
             }
         }
     }

bitchat/ViewModels/NostrInboundPipeline.swift

@@ -84,13 +84,21 @@ extension ChatViewModel: NostrInboundPipelineContext {
 /// Ordering is deliberate and performance-critical: cheap rejects (kind,
 /// dedup lookup) run BEFORE Schnorr signature verification because duplicates
 /// dominate real relay traffic; events are recorded only AFTER verification so
-/// a forged-signature copy can never poison the dedup set; gift-wrap
+/// a forged-signature copy can never poison the dedup set; private-envelope
 /// verification for the account mailbox runs off-main with an atomic
 /// main-actor check-and-record.
 final class NostrInboundPipeline {
     private weak var context: (any NostrInboundPipelineContext)?
     private let presence: GeoPresenceTracker
     private var geoEventLogCount = 0
+    // During the coordinated wire-format migration, one logical private
+    // payload is published under both primary and compatibility formats. Outer
+    // event IDs differ, so collapse the authenticated embedded payload before
+    // invoking message/ack side effects. Keep this bounded like the outer-ID
+    // caches; the recipient and authenticated sender are part of the key.
+    private var recentPrivatePayloadFormats: [String: UInt8] = [:]
+    private var recentPrivatePayloadKeyOrder: [String] = []
+    private static let privatePayloadDedupCapacity = 2_048
 
     init(context: any NostrInboundPipelineContext, presence: GeoPresenceTracker) {
         self.context = context
@@ -271,15 +279,16 @@ final class NostrInboundPipeline {
     }
 
     @MainActor
-    func subscribeGiftWrap(_ giftWrap: NostrEvent, id: NostrIdentity) {
+    func subscribePrivateEnvelope(_ envelope: NostrEvent, id: NostrIdentity) {
         guard let context else { return }
         // Dedup lookup before Schnorr verification; record only after it passes.
-        guard !context.hasProcessedNostrEvent(giftWrap.id) else { return }
-        guard giftWrap.isValidSignature() else { return }
-        context.recordProcessedNostrEvent(giftWrap.id)
+        guard !context.hasProcessedNostrEvent(envelope.id) else { return }
+        guard envelope.content.utf8.count <= NostrProtocol.maximumPrivateEnvelopeCiphertextBytes else { return }
+        guard envelope.isValidSignature() else { return }
+        context.recordProcessedNostrEvent(envelope.id)
 
-        guard let (content, senderPubkey, rumorTs) = try? NostrProtocol.decryptPrivateMessage(
-            giftWrap: giftWrap,
+        guard let (content, senderPubkey, messageTs) = try? NostrProtocol.decryptPrivateEnvelope(
+            envelope: envelope,
             recipientIdentity: id
         ),
         let packet = Self.decodeEmbeddedBitChatPacket(from: content),
@@ -288,8 +297,14 @@ final class NostrInboundPipeline {
         else {
             return
         }
+        guard shouldProcessPrivatePayload(
+            noisePayload,
+            senderPubkey: senderPubkey,
+            recipientPubkey: id.publicKeyHex,
+            envelopeKind: envelope.kind
+        ) else { return }
 
-        let messageTimestamp = Date(timeIntervalSince1970: TimeInterval(rumorTs))
+        let messageTimestamp = Date(timeIntervalSince1970: TimeInterval(messageTs))
         let convKey = PeerID(nostr_: senderPubkey)
         context.registerNostrKeyMapping(senderPubkey, for: convKey)
 
@@ -316,25 +331,26 @@ final class NostrInboundPipeline {
     }
 
     @MainActor
-    func handleGiftWrap(_ giftWrap: NostrEvent, id: NostrIdentity) {
+    func handlePrivateEnvelope(_ envelope: NostrEvent, id: NostrIdentity) {
         guard let context else { return }
         // Dedup lookup before Schnorr verification; record only after it passes.
-        if context.hasProcessedNostrEvent(giftWrap.id) {
+        if context.hasProcessedNostrEvent(envelope.id) {
             return
         }
-        guard giftWrap.isValidSignature() else { return }
-        context.recordProcessedNostrEvent(giftWrap.id)
+        guard envelope.content.utf8.count <= NostrProtocol.maximumPrivateEnvelopeCiphertextBytes else { return }
+        guard envelope.isValidSignature() else { return }
+        context.recordProcessedNostrEvent(envelope.id)
 
-        guard let (content, senderPubkey, rumorTs) = try? NostrProtocol.decryptPrivateMessage(
-            giftWrap: giftWrap,
+        guard let (content, senderPubkey, messageTs) = try? NostrProtocol.decryptPrivateEnvelope(
+            envelope: envelope,
             recipientIdentity: id
         ) else {
-            SecureLogger.warning("GeoDM: failed decrypt giftWrap id=\(giftWrap.id.prefix(8))…", category: .session)
+            SecureLogger.warning("GeoDM: failed decrypt private envelope id=\(envelope.id.prefix(8))…", category: .session)
             return
         }
 
         SecureLogger.debug(
-            "GeoDM: decrypted gift-wrap id=\(giftWrap.id.prefix(16))... from=\(senderPubkey.prefix(8))...",
+            "GeoDM: decrypted private envelope id=\(envelope.id.prefix(16))... from=\(senderPubkey.prefix(8))...",
             category: .session
         )
 
@@ -344,13 +360,19 @@ final class NostrInboundPipeline {
         else {
             return
         }
+        guard shouldProcessPrivatePayload(
+            payload,
+            senderPubkey: senderPubkey,
+            recipientPubkey: id.publicKeyHex,
+            envelopeKind: envelope.kind
+        ) else { return }
 
         let convKey = PeerID(nostr_: senderPubkey)
         context.registerNostrKeyMapping(senderPubkey, for: convKey)
 
         switch payload.type {
         case .privateMessage:
-            let messageTimestamp = Date(timeIntervalSince1970: TimeInterval(rumorTs))
+            let messageTimestamp = Date(timeIntervalSince1970: TimeInterval(messageTs))
             context.handlePrivateMessage(
                 payload,
                 senderPubkey: senderPubkey,
@@ -372,28 +394,29 @@ final class NostrInboundPipeline {
     }
 
     @MainActor
-    func handleNostrMessage(_ giftWrap: NostrEvent) {
+    func handleAccountPrivateEnvelope(_ envelope: NostrEvent) {
         guard let context else { return }
         // Cheap dedup pre-check only; Schnorr verification runs off-main in
-        // processNostrMessage, which then does the authoritative
+        // processAccountPrivateEnvelope, which then does the authoritative
         // check-and-record. Recording stays after verification so a
         // forged-signature copy can never poison the dedup set and suppress
         // the genuine event.
-        if context.hasProcessedNostrEvent(giftWrap.id) { return }
+        if context.hasProcessedNostrEvent(envelope.id) { return }
 
         Task.detached(priority: .userInitiated) { [weak self] in
-            await self?.processNostrMessage(giftWrap)
+            await self?.processAccountPrivateEnvelope(envelope)
         }
     }
 
-    func processNostrMessage(_ giftWrap: NostrEvent) async {
-        guard giftWrap.isValidSignature() else { return }
+    func processAccountPrivateEnvelope(_ envelope: NostrEvent) async {
+        guard envelope.content.utf8.count <= NostrProtocol.maximumPrivateEnvelopeCiphertextBytes else { return }
+        guard envelope.isValidSignature() else { return }
         guard let context else { return }
         // Authoritative check-and-record, atomic on the main actor so two
         // concurrent detached tasks can't both process the same event.
         let alreadyProcessed: Bool = await MainActor.run {
-            if context.hasProcessedNostrEvent(giftWrap.id) { return true }
-            context.recordProcessedNostrEvent(giftWrap.id)
+            if context.hasProcessedNostrEvent(envelope.id) { return true }
+            context.recordProcessedNostrEvent(envelope.id)
             return false
         }
         if alreadyProcessed { return }
@@ -403,8 +426,8 @@ final class NostrInboundPipeline {
         guard let currentIdentity else { return }
 
         do {
-            let (content, senderPubkey, rumorTimestamp) = try NostrProtocol.decryptPrivateMessage(
-                giftWrap: giftWrap,
+            let (content, senderPubkey, messageTimestampSeconds) = try NostrProtocol.decryptPrivateEnvelope(
+                envelope: envelope,
                 recipientIdentity: currentIdentity
             )
 
@@ -428,8 +451,14 @@ final class NostrInboundPipeline {
 
                 if packet.type == MessageType.noiseEncrypted.rawValue,
                    let payload = NoisePayload.decode(packet.payload) {
-                    let messageTimestamp = Date(timeIntervalSince1970: TimeInterval(rumorTimestamp))
+                    let messageTimestamp = Date(timeIntervalSince1970: TimeInterval(messageTimestampSeconds))
                     await MainActor.run {
+                        guard self.shouldProcessPrivatePayload(
+                            payload,
+                            senderPubkey: senderPubkey,
+                            recipientPubkey: currentIdentity.publicKeyHex,
+                            envelopeKind: envelope.kind
+                        ) else { return }
                         context.registerNostrKeyMapping(senderPubkey, for: targetPeerID)
 
                         switch payload.type {
@@ -503,6 +532,47 @@ final class NostrInboundPipeline {
 }
 
 private extension NostrInboundPipeline {
+    @MainActor
+    func shouldProcessPrivatePayload(
+        _ payload: NoisePayload,
+        senderPubkey: String,
+        recipientPubkey: String,
+        envelopeKind: Int
+    ) -> Bool {
+        let digest = payload.encode().sha256Fingerprint()
+        let key = "\(recipientPubkey.lowercased()):\(senderPubkey.lowercased()):\(digest)"
+        let formatBit: UInt8
+        switch envelopeKind {
+        case NostrProtocol.EventKind.privateEnvelope.rawValue:
+            formatBit = 1 << 0
+        case NostrProtocol.EventKind.legacyNIP59GiftWrap.rawValue:
+            formatBit = 1 << 1
+        default:
+            return true
+        }
+
+        if let observedFormats = recentPrivatePayloadFormats[key] {
+            if observedFormats & formatBit != 0 {
+                // A same-format re-envelope is a delivery retry. Let it reach
+                // the coordinator so a lost DELIVERED acknowledgement can be
+                // sent again; downstream message-ID dedup prevents rerendering.
+                return true
+            }
+            // The same authenticated payload under the other migration format
+            // is the compatibility twin, not a new message or acknowledgement.
+            recentPrivatePayloadFormats[key] = observedFormats | formatBit
+            return false
+        }
+
+        recentPrivatePayloadFormats[key] = formatBit
+        recentPrivatePayloadKeyOrder.append(key)
+        if recentPrivatePayloadKeyOrder.count > Self.privatePayloadDedupCapacity {
+            let evicted = recentPrivatePayloadKeyOrder.removeFirst()
+            recentPrivatePayloadFormats.removeValue(forKey: evicted)
+        }
+        return true
+    }
+
     @MainActor
     static func decodeEmbeddedBitChatPacket(from content: String) -> BitchatPacket? {
         guard content.hasPrefix("bitchat1:") else { return nil }

bitchat/Views/ContentSheetViews.swift

@@ -6,11 +6,26 @@ import UIKit
 import AppKit
 #endif
 
+struct ContentPeopleSheetModalPresentationState {
+    var isImagePreviewPresented = false
+    var isVerificationSheetPresented = false
+    var legacyPrivateMediaConsentRequest: LegacyPrivateMediaConsentRequest? = nil
+    var isMediaPickerPresented = false
+
+    var hasPresentation: Bool {
+        isImagePreviewPresented
+            || isVerificationSheetPresented
+            || legacyPrivateMediaConsentRequest != nil
+            || isMediaPickerPresented
+    }
+}
+
 struct ContentPeopleSheetView: View {
     @EnvironmentObject private var appChromeModel: AppChromeModel
     @EnvironmentObject private var privateConversationModel: PrivateConversationModel
     @EnvironmentObject private var verificationModel: VerificationModel
     @EnvironmentObject private var conversationUIModel: ConversationUIModel
+    @Environment(\.scenePhase) private var scenePhase
 
     @Binding var showSidebar: Bool
     @Binding var messageText: String
@@ -23,6 +38,7 @@ struct ContentPeopleSheetView: View {
     var isTextFieldFocused: FocusState<Bool>.Binding
     @ObservedObject var voiceRecordingVM: VoiceRecordingViewModel
     @Binding var autocompleteDebounceTimer: Timer?
+    @State private var showVerifySheet = false
     @ThemedPalette private var palette
 
     let headerHeight: CGFloat
@@ -35,6 +51,40 @@ struct ContentPeopleSheetView: View {
     @Binding var showMacImagePicker: Bool
     #endif
 
+    private var hasModalPresentation: Bool {
+        #if os(iOS)
+        let isMediaPickerPresented = showImagePicker
+        #else
+        let isMediaPickerPresented = showMacImagePicker
+        #endif
+
+        return ContentPeopleSheetModalPresentationState(
+            isImagePreviewPresented: imagePreviewURL != nil,
+            isVerificationSheetPresented: showVerifySheet,
+            legacyPrivateMediaConsentRequest:
+                conversationUIModel.legacyPrivateMediaConsentRequest,
+            isMediaPickerPresented: isMediaPickerPresented
+        ).hasPresentation
+    }
+
+    private var bluetoothAlertBinding: Binding<Bool> {
+        Binding(
+            get: {
+                scenePhase == .active
+                    && appChromeModel.showBluetoothAlert
+                    && !hasModalPresentation
+            },
+            set: { isPresented in
+                guard !isPresented,
+                      scenePhase == .active,
+                      !hasModalPresentation else {
+                    return
+                }
+                appChromeModel.showBluetoothAlert = false
+            }
+        )
+    }
+
     var body: some View {
         let legacyConsentRequest = conversationUIModel.legacyPrivateMediaConsentRequest
         NavigationStack {
@@ -78,7 +128,8 @@ struct ContentPeopleSheetView: View {
                     #endif
                 } else {
                     ContentPeopleListView(
-                        showSidebar: $showSidebar
+                        showSidebar: $showSidebar,
+                        showVerifySheet: $showVerifySheet
                     )
                 }
             }
@@ -182,6 +233,17 @@ struct ContentPeopleSheetView: View {
             }
         }
         #endif
+        .alert(
+            "content.alert.bluetooth_required.title",
+            isPresented: bluetoothAlertBinding
+        ) {
+            Button("content.alert.bluetooth_required.settings") {
+                SystemSettings.bluetooth.open()
+            }
+            Button("common.ok", role: .cancel) {}
+        } message: {
+            Text(appChromeModel.bluetoothAlertMessage)
+        }
     }
 }
 
@@ -196,8 +258,7 @@ private struct ContentPeopleListView: View {
     @ThemedPalette private var palette
 
     @Binding var showSidebar: Bool
-
-    @State private var showVerifySheet = false
+    @Binding var showVerifySheet: Bool
 
     var body: some View {
         VStack(spacing: 0) {
@@ -504,7 +565,8 @@ private struct ContentPrivateChatSheetView: View {
         if privateConversationModel.selectedPeerID?.isGroup == true {
             return String(localized: "content.private.caption_group", comment: "Caption above the group chat composer noting messages are encrypted to group members")
         }
-        // Geohash DMs are NIP-17 gift-wrapped — always end-to-end encrypted,
+        // Geohash DMs use BitChat's private-envelope transport over Nostr —
+        // always end-to-end encrypted,
         // even though they carry no Noise session status. Mesh DMs earn the
         // "encrypted" claim only once the Noise handshake has secured.
         let isGeoDM = privateConversationModel.selectedPeerID?.isGeoDM == true

bitchat/Views/ContentView.swift

@@ -14,6 +14,61 @@ import AppKit
 #endif
 import BitFoundation
 
+struct ContentRootModalPresentationState {
+    var isPeopleSheetPresented = false
+    var isAppInfoPresented = false
+    var isFingerprintPresented = false
+    var isLocationChannelsSheetPresented = false
+    var isNoticesSheetPresented = false
+    var isImagePreviewPresented = false
+    var isVerificationSheetPresented = false
+    var isVoiceAlertPresented = false
+    var isScreenshotPrivacyAlertPresented = false
+    var isMediaPickerPresented = false
+
+    var hasPresentation: Bool {
+        isPeopleSheetPresented
+            || isAppInfoPresented
+            || isFingerprintPresented
+            || isLocationChannelsSheetPresented
+            || isNoticesSheetPresented
+            || isImagePreviewPresented
+            || isVerificationSheetPresented
+            || isVoiceAlertPresented
+            || isScreenshotPrivacyAlertPresented
+            || isMediaPickerPresented
+    }
+}
+
+extension ContentRootModalPresentationState {
+    @MainActor
+    init(
+        appChromeModel: AppChromeModel,
+        isPeopleSheetPresented: Bool = false,
+        isImagePreviewPresented: Bool = false,
+        isVerificationSheetPresented: Bool = false,
+        isVoiceAlertPresented: Bool = false,
+        isMediaPickerPresented: Bool = false
+    ) {
+        self.init(
+            isPeopleSheetPresented: isPeopleSheetPresented,
+            isAppInfoPresented: appChromeModel.isAppInfoPresented,
+            isFingerprintPresented:
+                appChromeModel.showingFingerprintFor != nil,
+            isLocationChannelsSheetPresented:
+                appChromeModel.isLocationChannelsSheetPresented,
+            isNoticesSheetPresented:
+                appChromeModel.isNoticesSheetPresented,
+            isImagePreviewPresented: isImagePreviewPresented,
+            isVerificationSheetPresented: isVerificationSheetPresented,
+            isVoiceAlertPresented: isVoiceAlertPresented,
+            isScreenshotPrivacyAlertPresented:
+                appChromeModel.showScreenshotPrivacyWarning,
+            isMediaPickerPresented: isMediaPickerPresented
+        )
+    }
+}
+
 /// On macOS 14+, disables the default system focus ring on TextFields.
 /// On earlier macOS versions and on iOS this is a no-op.
 struct FocusEffectDisabledModifier: ViewModifier {
@@ -42,6 +97,7 @@ struct ContentView: View {
     @FocusState private var isTextFieldFocused: Bool
     @Environment(\.colorScheme) var colorScheme
     @Environment(\.appTheme) private var appTheme
+    @Environment(\.scenePhase) private var scenePhase
     @State private var showSidebar = false
     @State private var selectedMessageSender: String?
     @State private var selectedMessageSenderID: PeerID?
@@ -71,6 +127,45 @@ struct ContentView: View {
 
     private var usesGlassLayout: Bool { appTheme.usesGlassChrome }
 
+    private var isPeopleSheetPresented: Bool {
+        showSidebar || selectedPrivatePeerID != nil
+    }
+
+    private var hasRootModalPresentation: Bool {
+        #if os(iOS)
+        let isMediaPickerPresented = showImagePicker
+        #else
+        let isMediaPickerPresented = showMacImagePicker
+        #endif
+
+        return ContentRootModalPresentationState(
+            appChromeModel: appChromeModel,
+            isPeopleSheetPresented: isPeopleSheetPresented,
+            isImagePreviewPresented: imagePreviewURL != nil,
+            isVerificationSheetPresented: showVerifySheet,
+            isVoiceAlertPresented: voiceRecordingVM.showAlert,
+            isMediaPickerPresented: isMediaPickerPresented
+        ).hasPresentation
+    }
+
+    private var rootBluetoothAlertBinding: Binding<Bool> {
+        Binding(
+            get: {
+                scenePhase == .active
+                    && appChromeModel.showBluetoothAlert
+                    && !hasRootModalPresentation
+            },
+            set: { isPresented in
+                guard !isPresented,
+                      scenePhase == .active,
+                      !hasRootModalPresentation else {
+                    return
+                }
+                appChromeModel.showBluetoothAlert = false
+            }
+        )
+    }
+
     var body: some View {
         mainContent
             .onAppear {
@@ -107,11 +202,18 @@ struct ContentView: View {
         }
         .sheet(
             isPresented: Binding(
-                get: { showSidebar || selectedPrivatePeerID != nil },
+                get: { isPeopleSheetPresented },
                 set: { isPresented in
                     if !isPresented {
                         showSidebar = false
-                        privateConversationModel.endConversation()
+                        // Scene/background and Bluetooth-alert presentation
+                        // reconciliation are not user requests to leave the
+                        // conversation. Keep the selected DM so the sheet
+                        // remains live when the app returns from Settings.
+                        if scenePhase == .active,
+                           !appChromeModel.showBluetoothAlert {
+                            privateConversationModel.endConversation()
+                        }
                     }
                 }
             )
@@ -222,7 +324,7 @@ struct ContentView: View {
         }, message: {
             Text(voiceRecordingVM.state.alertMessage)
         })
-        .alert("content.alert.bluetooth_required.title", isPresented: $appChromeModel.showBluetoothAlert) {
+        .alert("content.alert.bluetooth_required.title", isPresented: rootBluetoothAlertBinding) {
             Button("content.alert.bluetooth_required.settings") {
                 SystemSettings.bluetooth.open()
             }

bitchatTests/BLEServiceCoreTests.swift

@@ -1030,6 +1030,44 @@ struct BLEServiceCoreTests {
         ))
     }
 
+    @Test @MainActor
+    func panicSuspension_finalizesStaleTransportEventsAsRejected() async {
+        let ble = makeService()
+        let delegate = TransportEventCaptureDelegate()
+        ble.eventDelegate = delegate
+        let message = BitchatMessage(
+            id: "pre-panic-finalization",
+            sender: "Peer",
+            content: "must be rejected",
+            timestamp: Date(),
+            isRelay: false,
+            isPrivate: true,
+            recipientNickname: "Me",
+            senderPeerID: PeerID(str: "1122334455667788")
+        )
+        var completions = 0
+        var outcomes: [TransportEventDeliveryOutcome] = []
+
+        ble._test_emitTransportEvent(
+            .messageReceived(message),
+            completion: { completions += 1 },
+            finalization: { outcomes.append($0) }
+        )
+        ble.suspendForPanicReset()
+        ble._test_emitTransportEvent(
+            .messageReceived(message),
+            completion: { completions += 1 },
+            finalization: { outcomes.append($0) }
+        )
+        for _ in 0..<4 {
+            await Task.yield()
+        }
+
+        #expect(delegate.messageIDs.isEmpty)
+        #expect(completions == 0)
+        #expect(outcomes == [.rejected, .rejected])
+    }
+
     @Test
     func modifiedServices_rediscoverWhenBitChatServiceIsInvalidated() async throws {
         let otherService = CBUUID(string: "0000180F-0000-1000-8000-00805F9B34FB")

bitchatTests/ChatMediaTransferCoordinatorContextTests.swift

@@ -58,6 +58,8 @@ private final class MockChatMediaTransferContext: ChatMediaTransferContext {
 
     private(set) var appendedPublicMessages: [(message: BitchatMessage, conversationID: ConversationID)] = []
     private(set) var removedMessages: [(messageID: String, cleanupFile: Bool)] = []
+    private(set) var untombstonedMediaRemovals: [String] = []
+    private(set) var outgoingMediaRemovals: [String] = []
     private(set) var systemMessages: [String] = []
     private(set) var notifyUIChangedCount = 0
 
@@ -71,6 +73,16 @@ private final class MockChatMediaTransferContext: ChatMediaTransferContext {
         removedMessages.append((messageID, cleanupFile))
     }
 
+    func removeUntombstonedMediaMessage(withID messageID: String) {
+        untombstonedMediaRemovals.append(messageID)
+        removedMessages.append((messageID, false))
+    }
+
+    func removeOutgoingMediaMessage(withID messageID: String) {
+        outgoingMediaRemovals.append(messageID)
+        removedMessages.append((messageID, false))
+    }
+
     func addSystemMessage(_ content: String) { systemMessages.append(content) }
     func notifyUIChanged() { notifyUIChangedCount += 1 }
 
@@ -95,10 +107,27 @@ private final class MockChatMediaTransferContext: ChatMediaTransferContext {
         transferId: String
     )] = []
     private(set) var privateFileLegacyAllowances: [Bool] = []
+    private(set) var privateFileReceiptRetryTransferIDs: [String] = []
     private(set) var broadcastFileSends: [String] = []
     private(set) var cancelledTransfers: [String] = []
+    private(set) var privateMediaPolicyResolutionRequests: [PeerID] = []
+    private(set) var persistedDeletionBatches: [[String]] = []
+    var requiredTombstoneIDs: Set<String> = []
+    var deletedMediaPersistenceResult = true
+    var deferDeletedMediaPersistence = false
+    private var pendingDeletionCompletions: [
+        @MainActor (Bool) -> Void
+    ] = []
     var privateMediaPolicy: PrivateMediaSendPolicy = .encrypted
     var resolvedPrivateMediaPolicy: PrivateMediaSendPolicy?
+    var resolvesPrivateMediaPolicyImmediately = true
+    var supportsAuthenticatedPrivateMediaReceipts = false
+    var authenticatedPrivateMediaReceiptGeneration = UUID(
+        uuidString: "00000000-0000-0000-0000-000000000001"
+    )!
+    private var pendingPrivateMediaPolicyResolutions: [
+        @MainActor (PrivateMediaSendPolicy) -> Void
+    ] = []
     private(set) var legacyConsentRequests: [(
         id: UUID,
         peerID: PeerID,
@@ -113,11 +142,40 @@ private final class MockChatMediaTransferContext: ChatMediaTransferContext {
         privateMediaPolicy
     }
 
+    func authenticatedPrivateMediaReceiptSessionGeneration(
+        to peerID: PeerID
+    ) -> UUID? {
+        supportsAuthenticatedPrivateMediaReceipts
+            ? authenticatedPrivateMediaReceiptGeneration
+            : nil
+    }
+
     func resolvePrivateMediaSendPolicy(
         to peerID: PeerID,
         completion: @escaping @MainActor (PrivateMediaSendPolicy) -> Void
     ) {
-        completion(resolvedPrivateMediaPolicy ?? privateMediaPolicy)
+        privateMediaPolicyResolutionRequests.append(peerID)
+        if resolvesPrivateMediaPolicyImmediately {
+            completion(resolvedPrivateMediaPolicy ?? privateMediaPolicy)
+        } else {
+            pendingPrivateMediaPolicyResolutions.append(completion)
+        }
+    }
+
+    var pendingPrivateMediaPolicyResolutionCount: Int {
+        pendingPrivateMediaPolicyResolutions.count
+    }
+
+    func resolveNextPrivateMediaPolicy(
+        _ policy: PrivateMediaSendPolicy? = nil
+    ) {
+        guard !pendingPrivateMediaPolicyResolutions.isEmpty else { return }
+        let completion = pendingPrivateMediaPolicyResolutions.removeFirst()
+        completion(
+            policy
+                ?? resolvedPrivateMediaPolicy
+                ?? privateMediaPolicy
+        )
     }
 
     func requestLegacyPrivateMediaConsent(
@@ -162,6 +220,16 @@ private final class MockChatMediaTransferContext: ChatMediaTransferContext {
         privateFileLegacyAllowances.append(allowLegacyFallback)
     }
 
+    func sendFilePrivateReceiptRetry(
+        _ packet: BitchatFilePacket,
+        to peerID: PeerID,
+        transferId: String
+    ) {
+        privateFileSends.append((packet, peerID, transferId))
+        privateFileLegacyAllowances.append(false)
+        privateFileReceiptRetryTransferIDs.append(transferId)
+    }
+
     func sendFileBroadcast(_ packet: BitchatFilePacket, transferId: String) {
         broadcastFileSends.append(transferId)
     }
@@ -169,6 +237,28 @@ private final class MockChatMediaTransferContext: ChatMediaTransferContext {
     func cancelTransfer(_ transferId: String) {
         cancelledTransfers.append(transferId)
     }
+
+    func persistDeletedPrivateMedia(
+        messageIDs: [String],
+        completion: @escaping @MainActor (Bool) -> Void
+    ) {
+        persistedDeletionBatches.append(messageIDs)
+        if deferDeletedMediaPersistence {
+            pendingDeletionCompletions.append(completion)
+        } else {
+            completion(deletedMediaPersistenceResult)
+        }
+    }
+
+    func requiresPrivateMediaTombstone(messageID: String) -> Bool {
+        requiredTombstoneIDs.contains(messageID)
+    }
+
+    func resolveNextDeletionPersistence(_ result: Bool? = nil) {
+        guard !pendingDeletionCompletions.isEmpty else { return }
+        let completion = pendingDeletionCompletions.removeFirst()
+        completion(result ?? deletedMediaPersistenceResult)
+    }
 }
 
 private final class PausedVoiceNotePreparer: @unchecked Sendable {
@@ -216,6 +306,59 @@ private final class PausedVoiceNotePreparer: @unchecked Sendable {
     }
 }
 
+private final class StaticVoiceNotePreparer: @unchecked Sendable {
+    private let packet: BitchatFilePacket
+
+    init(fileName: String, content: Data = Data("voice".utf8)) {
+        packet = BitchatFilePacket(
+            fileName: fileName,
+            fileSize: UInt64(content.count),
+            mimeType: "audio/mp4",
+            content: content
+        )
+    }
+
+    func prepare(_ _: URL) throws -> BitchatFilePacket {
+        packet
+    }
+}
+
+private final class DeterministicMediaTransferIDFactory:
+    @unchecked Sendable {
+    private let lock = NSLock()
+    private var nextOrdinal = 0
+
+    func make(messageID: String) -> String {
+        lock.lock()
+        defer {
+            nextOrdinal += 1
+            lock.unlock()
+        }
+        return "\(messageID)-attempt-\(nextOrdinal)"
+    }
+}
+
+private final class MutableMediaRetryClock: @unchecked Sendable {
+    private let lock = NSLock()
+    private var value: Date
+
+    init(_ value: Date) {
+        self.value = value
+    }
+
+    func now() -> Date {
+        lock.lock()
+        defer { lock.unlock() }
+        return value
+    }
+
+    func advance(by interval: TimeInterval) {
+        lock.lock()
+        value = value.addingTimeInterval(interval)
+        lock.unlock()
+    }
+}
+
 // MARK: - Coordinator Tests Against Mock Context
 
 /// Exercises `ChatMediaTransferCoordinator` against
@@ -279,7 +422,8 @@ struct ChatMediaTransferCoordinatorContextTests {
         coordinator.handleTransferEvent(.cancelled(id: "t2", sentFragments: 1, totalFragments: 5))
         #expect(context.removedMessages.count == 1)
         #expect(context.removedMessages.first?.messageID == "m2")
-        #expect(context.removedMessages.first?.cleanupFile == true)
+        #expect(context.removedMessages.first?.cleanupFile == false)
+        #expect(context.outgoingMediaRemovals == ["m2"])
 
         // A pre-start rejection keeps the placeholder visible and failed,
         // including queued post-handshake encryption failures.
@@ -429,7 +573,172 @@ struct ChatMediaTransferCoordinatorContextTests {
         #expect(context.cancelledTransfers == ["approved-delete"])
         #expect(coordinator.messageIDToTransferId["message-delete"] == nil)
         #expect(context.removedMessages.map(\.messageID) == ["message-delete"])
-        #expect(context.removedMessages.first?.cleanupFile == true)
+        #expect(context.removedMessages.first?.cleanupFile == false)
+        #expect(
+            context.untombstonedMediaRemovals == ["message-delete"]
+        )
+    }
+
+    @Test @MainActor
+    func deleteIncomingStableMediaWaitsForDurableTombstone() {
+        let context = MockChatMediaTransferContext()
+        let coordinator = ChatMediaTransferCoordinator(context: context)
+        let messageID = "media-00112233445566778899aabbccddeeff"
+        context.requiredTombstoneIDs = [messageID]
+        context.deferDeletedMediaPersistence = true
+        coordinator.registerTransfer(
+            transferId: "incoming-delete",
+            messageID: messageID
+        )
+
+        coordinator.deleteMediaMessage(messageID: messageID)
+
+        #expect(context.persistedDeletionBatches == [[messageID]])
+        #expect(context.removedMessages.isEmpty)
+        #expect(context.cancelledTransfers == ["incoming-delete"])
+        #expect(coordinator.messageIDToTransferId[messageID] == nil)
+
+        context.resolveNextDeletionPersistence(true)
+
+        #expect(context.cancelledTransfers == ["incoming-delete"])
+        #expect(context.removedMessages.map(\.messageID) == [messageID])
+        #expect(context.removedMessages.first?.cleanupFile == false)
+        #expect(context.untombstonedMediaRemovals.isEmpty)
+        #expect(coordinator.messageIDToTransferId[messageID] == nil)
+    }
+
+    @Test @MainActor
+    func deleteIncomingStableMediaCompletionAfterPanicIsIgnored() {
+        let context = MockChatMediaTransferContext()
+        let coordinator = ChatMediaTransferCoordinator(context: context)
+        let messageID = "media-11223344556677889900aabbccddeeff"
+        context.requiredTombstoneIDs = [messageID]
+        context.deferDeletedMediaPersistence = true
+
+        coordinator.deleteMediaMessage(messageID: messageID)
+        #expect(context.persistedDeletionBatches == [[messageID]])
+
+        coordinator.resetForPanic()
+        context.resolveNextDeletionPersistence(true)
+
+        #expect(context.removedMessages.isEmpty)
+        #expect(context.untombstonedMediaRemovals.isEmpty)
+    }
+
+    @Test @MainActor
+    func deleteIncomingStableMediaPreservesStateWhenTombstoneFails() {
+        let context = MockChatMediaTransferContext()
+        let coordinator = ChatMediaTransferCoordinator(context: context)
+        let messageID = "media-ffeeddccbbaa99887766554433221100"
+        context.requiredTombstoneIDs = [messageID]
+        context.deletedMediaPersistenceResult = false
+        coordinator.registerTransfer(
+            transferId: "failed-delete",
+            messageID: messageID
+        )
+
+        coordinator.deleteMediaMessage(messageID: messageID)
+
+        #expect(context.persistedDeletionBatches == [[messageID]])
+        #expect(context.removedMessages.isEmpty)
+        #expect(context.cancelledTransfers == ["failed-delete"])
+        #expect(coordinator.messageIDToTransferId[messageID] == nil)
+    }
+
+    @Test @MainActor
+    func deleteStableMediaReleasesRetainedRetryBeforeTombstoneCommit()
+        async throws
+    {
+        let context = MockChatMediaTransferContext()
+        let peerID = PeerID(str: "1122334455667788")
+        context.selectedPrivateChatPeer = peerID
+        context.supportsAuthenticatedPrivateMediaReceipts = true
+        context.deferDeletedMediaPersistence = true
+        let fileName = "voice_deadbeefdeadbeef.m4a"
+        let preparer = StaticVoiceNotePreparer(fileName: fileName)
+        let coordinator = ChatMediaTransferCoordinator(
+            context: context,
+            prepareVoiceNotePacket: { url in
+                try preparer.prepare(url)
+            }
+        )
+        let url = try makeCoordinatorVoiceURL(fileName: fileName)
+        defer {
+            try? FileManager.default.removeItem(
+                at: url.deletingLastPathComponent()
+            )
+        }
+
+        coordinator.sendVoiceNote(at: url)
+        #expect(await TestHelpers.waitUntil(
+            { context.privateFileSends.count == 1 },
+            timeout: TestConstants.longTimeout
+        ))
+        let messageID = try #require(
+            context.privateChats[peerID]?.first?.id
+        )
+        let transferID = try #require(
+            context.privateFileSends.first?.transferId
+        )
+        context.requiredTombstoneIDs = [messageID]
+        #expect(coordinator.retainedReconnectRetryCount == 1)
+
+        coordinator.deleteMediaMessage(messageID: messageID)
+
+        #expect(context.persistedDeletionBatches == [[messageID]])
+        #expect(coordinator.retainedReconnectRetryCount == 0)
+        #expect(coordinator.retainedReconnectRetryBytes == 0)
+        #expect(context.cancelledTransfers == [transferID])
+        #expect(context.removedMessages.isEmpty)
+
+        coordinator.peerDidReconnect(peerID)
+        #expect(context.privateFileSends.count == 1)
+
+        context.resolveNextDeletionPersistence(true)
+        #expect(context.removedMessages.map(\.messageID) == [messageID])
+    }
+
+    @Test @MainActor
+    func legacyCleanupNeverRecursivelyDeletesDirectoryTarget() throws {
+        let context = MockChatMediaTransferContext()
+        let coordinator = ChatMediaTransferCoordinator(context: context)
+        let incoming = try FileManager.default.url(
+            for: .applicationSupportDirectory,
+            in: .userDomainMask,
+            appropriateFor: nil,
+            create: true
+        )
+        .appendingPathComponent(
+            "files/images/incoming",
+            isDirectory: true
+        )
+        let directoryName = "cleanup-dir-\(UUID().uuidString)"
+        let directory = incoming.appendingPathComponent(
+            directoryName,
+            isDirectory: true
+        )
+        try FileManager.default.createDirectory(
+            at: directory,
+            withIntermediateDirectories: true
+        )
+        let child = directory.appendingPathComponent("child.jpg")
+        try Data([0x01]).write(to: child)
+        defer { try? FileManager.default.removeItem(at: directory) }
+        let message = BitchatMessage(
+            id: UUID().uuidString,
+            sender: "Peer",
+            content:
+                "\(MimeType.Category.image.messagePrefix)\(directoryName)",
+            timestamp: Date(),
+            isRelay: false,
+            isPrivate: true,
+            recipientNickname: "Me"
+        )
+
+        coordinator.cleanupIncomingLocalFile(forMessage: message)
+
+        #expect(FileManager.default.fileExists(atPath: directory.path))
+        #expect(FileManager.default.fileExists(atPath: child.path))
     }
 
     @Test @MainActor
@@ -798,6 +1107,548 @@ struct ChatMediaTransferCoordinatorContextTests {
         #expect(context.legacyConsentRequests.isEmpty)
         #expect(context.privateFileSends.isEmpty)
     }
+
+    @Test @MainActor
+    func receiptCapableEncryptedMediaRetriesExactPacketAfterReconnect() async throws {
+        let context = MockChatMediaTransferContext()
+        let peerID = PeerID(str: "1122334455667788")
+        context.selectedPrivateChatPeer = peerID
+        context.supportsAuthenticatedPrivateMediaReceipts = true
+        let fileName = "voice_0011223344556677.m4a"
+        let preparer = StaticVoiceNotePreparer(fileName: fileName)
+        let transferIDs = DeterministicMediaTransferIDFactory()
+        let coordinator = ChatMediaTransferCoordinator(
+            context: context,
+            prepareVoiceNotePacket: { url in
+                try preparer.prepare(url)
+            },
+            transferIDFactory: transferIDs.make
+        )
+        let url = try makeCoordinatorVoiceURL(fileName: fileName)
+        defer {
+            try? FileManager.default.removeItem(
+                at: url.deletingLastPathComponent()
+            )
+        }
+
+        coordinator.sendVoiceNote(at: url)
+        #expect(await TestHelpers.waitUntil(
+            { context.privateFileSends.count == 1 },
+            timeout: TestConstants.longTimeout
+        ))
+        let messageID = try #require(
+            context.privateChats[peerID]?.first?.id
+        )
+        let initial = try #require(
+            context.privateFileSends.first
+        )
+        #expect(PrivateMediaMessageIdentity.isStableID(messageID))
+        #expect(coordinator.retainedReconnectRetryCount == 1)
+
+        coordinator.handleTransferEvent(.completed(
+            id: initial.transferId,
+            totalFragments: 1
+        ))
+        #expect(coordinator.retainedReconnectRetryCount == 1)
+        #expect(context.deliveryStatusUpdates.last?.status == .sent)
+
+        coordinator.peerDidReconnect(peerID)
+        #expect(context.privateFileSends.count == 2)
+        let retry = try #require(context.privateFileSends.last)
+        #expect(retry.packet.encode() == initial.packet.encode())
+        #expect(retry.peerID == peerID)
+        #expect(retry.transferId != initial.transferId)
+        #expect(context.privateFileReceiptRetryTransferIDs == [
+            retry.transferId
+        ])
+        #expect(context.privateFileLegacyAllowances == [false, false])
+
+        coordinator.confirmPrivateMediaDelivery(messageID: messageID)
+        #expect(coordinator.retainedReconnectRetryCount == 0)
+        #expect(context.cancelledTransfers == [retry.transferId])
+        #expect(context.removedMessages.isEmpty)
+        #expect(!context.deliveryStatusUpdates.contains {
+            if case .failed = $0.status { return true }
+            return false
+        })
+
+        // Receipt confirmation removes retry ownership before transport
+        // cancellation, so its late callback cannot delete the delivered row
+        // or re-arm another reconnect retry.
+        coordinator.handleTransferEvent(.cancelled(
+            id: retry.transferId,
+            sentFragments: 1,
+            totalFragments: 2
+        ))
+        coordinator.peerDidReconnect(peerID)
+        #expect(context.privateFileSends.count == 2)
+        #expect(context.removedMessages.isEmpty)
+        #expect(coordinator.messageIDToTransferId[messageID] == nil)
+    }
+
+    @Test @MainActor
+    func bit8OnlyEncryptedMediaNeverRetainsOrAutomaticallyRetries() async throws {
+        let context = MockChatMediaTransferContext()
+        let peerID = PeerID(str: "1122334455667788")
+        context.selectedPrivateChatPeer = peerID
+        context.privateMediaPolicy = .encrypted
+        context.supportsAuthenticatedPrivateMediaReceipts = false
+        let fileName = "voice_1111222233334444.m4a"
+        let preparer = StaticVoiceNotePreparer(fileName: fileName)
+        let coordinator = ChatMediaTransferCoordinator(
+            context: context,
+            prepareVoiceNotePacket: { url in
+                try preparer.prepare(url)
+            }
+        )
+        let url = try makeCoordinatorVoiceURL(fileName: fileName)
+        defer {
+            try? FileManager.default.removeItem(
+                at: url.deletingLastPathComponent()
+            )
+        }
+
+        coordinator.sendVoiceNote(at: url)
+        #expect(await TestHelpers.waitUntil(
+            { context.privateFileSends.count == 1 },
+            timeout: TestConstants.longTimeout
+        ))
+        let initial = try #require(context.privateFileSends.first)
+        coordinator.handleTransferEvent(.completed(
+            id: initial.transferId,
+            totalFragments: 1
+        ))
+        coordinator.peerDidReconnect(peerID)
+        coordinator.peerDidAuthenticate(peerID)
+
+        #expect(coordinator.retainedReconnectRetryCount == 0)
+        #expect(context.privateFileSends.count == 1)
+        #expect(context.privateFileReceiptRetryTransferIDs.isEmpty)
+        #expect(context.privateMediaPolicyResolutionRequests.isEmpty)
+    }
+
+    @Test @MainActor
+    func consentedRawLegacyMediaNeverEntersAutomaticRetry() async throws {
+        let context = MockChatMediaTransferContext()
+        let peerID = PeerID(str: "1122334455667788")
+        context.selectedPrivateChatPeer = peerID
+        context.privateMediaPolicy = .legacyRequiresConsent
+        // Even a contradictory stale bit-9 observation must not retain an
+        // invocation that actually selected the explicit raw path.
+        context.supportsAuthenticatedPrivateMediaReceipts = true
+        let fileName = "voice_2222333344445555.m4a"
+        let preparer = StaticVoiceNotePreparer(fileName: fileName)
+        let coordinator = ChatMediaTransferCoordinator(
+            context: context,
+            prepareVoiceNotePacket: { url in
+                try preparer.prepare(url)
+            }
+        )
+        let url = try makeCoordinatorVoiceURL(fileName: fileName)
+        defer {
+            try? FileManager.default.removeItem(
+                at: url.deletingLastPathComponent()
+            )
+        }
+
+        coordinator.sendVoiceNote(at: url)
+        #expect(await TestHelpers.waitUntil(
+            { context.legacyConsentRequests.count == 1 },
+            timeout: TestConstants.longTimeout
+        ))
+        context.resolveNextLegacyConsent(true)
+        let initial = try #require(context.privateFileSends.first)
+        #expect(context.privateFileLegacyAllowances == [true])
+        #expect(coordinator.retainedReconnectRetryCount == 0)
+
+        coordinator.handleTransferEvent(.completed(
+            id: initial.transferId,
+            totalFragments: 1
+        ))
+        context.privateMediaPolicy = .encrypted
+        coordinator.peerDidReconnect(peerID)
+        coordinator.peerDidAuthenticate(peerID)
+
+        #expect(context.privateFileSends.count == 1)
+        #expect(context.privateFileReceiptRetryTransferIDs.isEmpty)
+        #expect(coordinator.retainedReconnectRetryCount == 0)
+    }
+
+    @Test @MainActor
+    func authenticatedGenerationSupersedesStaleReconnectResolution() async throws {
+        let context = MockChatMediaTransferContext()
+        let peerID = PeerID(str: "1122334455667788")
+        context.selectedPrivateChatPeer = peerID
+        context.supportsAuthenticatedPrivateMediaReceipts = true
+        context.resolvesPrivateMediaPolicyImmediately = false
+        let oldGeneration = context
+            .authenticatedPrivateMediaReceiptGeneration
+        let newGeneration = UUID(
+            uuidString: "00000000-0000-0000-0000-000000000002"
+        )!
+        let fileName = "voice_3333444455556666.m4a"
+        let preparer = StaticVoiceNotePreparer(fileName: fileName)
+        let transferIDs = DeterministicMediaTransferIDFactory()
+        let coordinator = ChatMediaTransferCoordinator(
+            context: context,
+            prepareVoiceNotePacket: { url in
+                try preparer.prepare(url)
+            },
+            transferIDFactory: transferIDs.make
+        )
+        let url = try makeCoordinatorVoiceURL(fileName: fileName)
+        defer {
+            try? FileManager.default.removeItem(
+                at: url.deletingLastPathComponent()
+            )
+        }
+
+        coordinator.sendVoiceNote(at: url)
+        #expect(await TestHelpers.waitUntil(
+            { context.privateFileSends.count == 1 },
+            timeout: TestConstants.longTimeout
+        ))
+        let initial = try #require(context.privateFileSends.first)
+        coordinator.peerDidReconnect(peerID)
+        #expect(context.pendingPrivateMediaPolicyResolutionCount == 1)
+
+        context.authenticatedPrivateMediaReceiptGeneration = newGeneration
+        coordinator.peerDidAuthenticate(peerID)
+        #expect(context.pendingPrivateMediaPolicyResolutionCount == 2)
+
+        // The old-generation completion lost ownership and is inert.
+        context.resolveNextPrivateMediaPolicy(.encrypted)
+        #expect(context.privateFileReceiptRetryTransferIDs.isEmpty)
+        #expect(context.cancelledTransfers.isEmpty)
+
+        context.resolveNextPrivateMediaPolicy(.encrypted)
+        #expect(context.cancelledTransfers == [initial.transferId])
+        #expect(context.privateFileReceiptRetryTransferIDs.count == 1)
+        #expect(
+            context.authenticatedPrivateMediaReceiptGeneration
+                == newGeneration
+        )
+        #expect(oldGeneration != newGeneration)
+    }
+
+    @Test @MainActor
+    func panicClearsRetainedRetryPendingResolutionAndExpiry() async throws {
+        let context = MockChatMediaTransferContext()
+        let peerID = PeerID(str: "1122334455667788")
+        context.selectedPrivateChatPeer = peerID
+        context.supportsAuthenticatedPrivateMediaReceipts = true
+        context.resolvesPrivateMediaPolicyImmediately = false
+        let fileName = "voice_3333444455556666.m4a"
+        let preparer = StaticVoiceNotePreparer(fileName: fileName)
+        let coordinator = ChatMediaTransferCoordinator(
+            context: context,
+            prepareVoiceNotePacket: { url in
+                try preparer.prepare(url)
+            },
+            reconnectRetryLimits: PrivateMediaReconnectRetryLimits(
+                maxRetainedPackets: 1,
+                maxRetainedBytes: 1_024,
+                maxRetriesPerMessage: 1,
+                retentionSeconds: 0.1,
+                maxRetriesPerReconnect: 1
+            )
+        )
+        let url = try makeCoordinatorVoiceURL(fileName: fileName)
+        defer {
+            try? FileManager.default.removeItem(
+                at: url.deletingLastPathComponent()
+            )
+        }
+
+        coordinator.sendVoiceNote(at: url)
+        #expect(await TestHelpers.waitUntil(
+            { context.privateFileSends.count == 1 },
+            timeout: TestConstants.longTimeout
+        ))
+        let initial = try #require(context.privateFileSends.first)
+        coordinator.handleTransferEvent(.completed(
+            id: initial.transferId,
+            totalFragments: 1
+        ))
+        #expect(coordinator.retainedReconnectRetryCount == 1)
+
+        coordinator.peerDidReconnect(peerID)
+        #expect(context.pendingPrivateMediaPolicyResolutionCount == 1)
+        let failedBeforePanic = context.deliveryStatusUpdates.filter {
+            if case .failed = $0.status { return true }
+            return false
+        }.count
+
+        coordinator.resetForPanic()
+        context.resolveNextPrivateMediaPolicy(.encrypted)
+        try await Task.sleep(nanoseconds: 250_000_000)
+        coordinator._test_expireReconnectRetries()
+
+        #expect(coordinator.retainedReconnectRetryCount == 0)
+        #expect(coordinator.retainedReconnectRetryBytes == 0)
+        #expect(coordinator.transferIdToMessageIDs.isEmpty)
+        #expect(coordinator.messageIDToTransferId.isEmpty)
+        #expect(context.privateFileSends.count == 1)
+        #expect(context.privateFileReceiptRetryTransferIDs.isEmpty)
+        #expect(context.deliveryStatusUpdates.filter {
+            if case .failed = $0.status { return true }
+            return false
+        }.count == failedBeforePanic)
+    }
+
+    @Test @MainActor
+    func retryCountAndRetentionTimeEndInVisibleFailure() async throws {
+        let context = MockChatMediaTransferContext()
+        let peerID = PeerID(str: "1122334455667788")
+        context.selectedPrivateChatPeer = peerID
+        context.supportsAuthenticatedPrivateMediaReceipts = true
+        let clock = MutableMediaRetryClock(
+            Date(timeIntervalSince1970: 4_000)
+        )
+        let limits = PrivateMediaReconnectRetryLimits(
+            maxRetainedPackets: 2,
+            maxRetainedBytes: 1_024,
+            maxRetriesPerMessage: 1,
+            retentionSeconds: 10,
+            maxRetriesPerReconnect: 1
+        )
+        let fileName = "voice_4444555566667777.m4a"
+        let preparer = StaticVoiceNotePreparer(fileName: fileName)
+        let transferIDs = DeterministicMediaTransferIDFactory()
+        let coordinator = ChatMediaTransferCoordinator(
+            context: context,
+            prepareVoiceNotePacket: { url in
+                try preparer.prepare(url)
+            },
+            reconnectRetryLimits: limits,
+            now: clock.now,
+            transferIDFactory: transferIDs.make
+        )
+        let url = try makeCoordinatorVoiceURL(fileName: fileName)
+        defer {
+            try? FileManager.default.removeItem(
+                at: url.deletingLastPathComponent()
+            )
+        }
+
+        coordinator.sendVoiceNote(at: url)
+        #expect(await TestHelpers.waitUntil(
+            { context.privateFileSends.count == 1 },
+            timeout: TestConstants.longTimeout
+        ))
+        let initial = try #require(context.privateFileSends.first)
+        coordinator.handleTransferEvent(.completed(
+            id: initial.transferId,
+            totalFragments: 1
+        ))
+        coordinator.peerDidReconnect(peerID)
+        let retryID = try #require(
+            context.privateFileReceiptRetryTransferIDs.first
+        )
+        coordinator.handleTransferEvent(.cancelled(
+            id: retryID,
+            sentFragments: 0,
+            totalFragments: 1
+        ))
+
+        #expect(coordinator.retainedReconnectRetryCount == 0)
+        #expect(context.removedMessages.isEmpty)
+        #expect(context.deliveryStatusUpdates.contains {
+            $0.messageID.hasPrefix("media-")
+                && $0.status == .failed(reason: String(
+                    localized: "content.delivery.reason.not_delivered",
+                    defaultValue: "Not delivered",
+                    comment: "Failure reason shown when a private media transfer could not finish"
+                ))
+        })
+
+        // A separate retained row that locally completed but never received a
+        // remote receipt expires to a distinct visible failure.
+        let ttlFileName = "voice_5555666677778888.m4a"
+        let ttlPreparer = StaticVoiceNotePreparer(
+            fileName: ttlFileName
+        )
+        let ttlCoordinator = ChatMediaTransferCoordinator(
+            context: context,
+            prepareVoiceNotePacket: { url in
+                try ttlPreparer.prepare(url)
+            },
+            reconnectRetryLimits: limits,
+            now: clock.now,
+            transferIDFactory: transferIDs.make
+        )
+        let ttlURL = try makeCoordinatorVoiceURL(
+            fileName: ttlFileName
+        )
+        defer {
+            try? FileManager.default.removeItem(
+                at: ttlURL.deletingLastPathComponent()
+            )
+        }
+        let sendsBeforeTTL = context.privateFileSends.count
+        ttlCoordinator.sendVoiceNote(at: ttlURL)
+        #expect(await TestHelpers.waitUntil(
+            {
+                context.privateFileSends.count
+                    == sendsBeforeTTL + 1
+            },
+            timeout: TestConstants.longTimeout
+        ))
+        let ttlInitial = try #require(context.privateFileSends.last)
+        ttlCoordinator.handleTransferEvent(.completed(
+            id: ttlInitial.transferId,
+            totalFragments: 1
+        ))
+        clock.advance(by: 10)
+        ttlCoordinator._test_expireReconnectRetries()
+
+        #expect(ttlCoordinator.retainedReconnectRetryCount == 0)
+        #expect(context.deliveryStatusUpdates.contains {
+            $0.status == .failed(
+                reason: String(
+                    localized:
+                        "content.delivery.reason.private_media_delivery_unconfirmed",
+                    defaultValue: "Delivery could not be confirmed"
+                )
+            )
+        })
+    }
+
+    @Test @MainActor
+    func retentionAndPerReconnectWorkAreBounded() async throws {
+        let context = MockChatMediaTransferContext()
+        let peerID = PeerID(str: "1122334455667788")
+        context.selectedPrivateChatPeer = peerID
+        context.supportsAuthenticatedPrivateMediaReceipts = true
+        let limits = PrivateMediaReconnectRetryLimits(
+            maxRetainedPackets: 2,
+            maxRetainedBytes: 10,
+            maxRetriesPerMessage: 2,
+            retentionSeconds: 120,
+            maxRetriesPerReconnect: 1
+        )
+        let transferIDs = DeterministicMediaTransferIDFactory()
+        let coordinator = ChatMediaTransferCoordinator(
+            context: context,
+            prepareVoiceNotePacket: { url in
+                let content = Data("voice".utf8)
+                return BitchatFilePacket(
+                    fileName: url.lastPathComponent,
+                    fileSize: UInt64(content.count),
+                    mimeType: "audio/mp4",
+                    content: content
+                )
+            },
+            reconnectRetryLimits: limits,
+            transferIDFactory: transferIDs.make
+        )
+        let fileNames = [
+            "voice_6666777788889999.m4a",
+            "voice_777788889999aaaa.m4a",
+            "voice_88889999aaaabbbb.m4a"
+        ]
+        var roots: [URL] = []
+        defer {
+            for root in roots {
+                try? FileManager.default.removeItem(at: root)
+            }
+        }
+
+        for fileName in fileNames {
+            let url = try makeCoordinatorVoiceURL(
+                fileName: fileName,
+                bytes: Data("voice".utf8)
+            )
+            roots.append(url.deletingLastPathComponent())
+            // The production preparer preserves this stable filename.
+            coordinator.sendVoiceNote(at: url)
+        }
+        #expect(await TestHelpers.waitUntil(
+            { context.privateFileSends.count == 3 },
+            timeout: TestConstants.longTimeout
+        ))
+        #expect(coordinator.retainedReconnectRetryCount == 2)
+        #expect(coordinator.retainedReconnectRetryBytes <= 10)
+
+        for send in context.privateFileSends {
+            coordinator.handleTransferEvent(.completed(
+                id: send.transferId,
+                totalFragments: 1
+            ))
+        }
+        coordinator.peerDidReconnect(peerID)
+        #expect(context.privateFileReceiptRetryTransferIDs.count == 1)
+    }
+
+    @Test @MainActor
+    func userCancellationReleasesRetainedBytesAndIgnoresLateEvent() async throws {
+        let context = MockChatMediaTransferContext()
+        let peerID = PeerID(str: "1122334455667788")
+        context.selectedPrivateChatPeer = peerID
+        context.supportsAuthenticatedPrivateMediaReceipts = true
+        let fileName = "voice_9999aaaabbbbcccc.m4a"
+        let preparer = StaticVoiceNotePreparer(fileName: fileName)
+        let coordinator = ChatMediaTransferCoordinator(
+            context: context,
+            prepareVoiceNotePacket: { url in
+                try preparer.prepare(url)
+            }
+        )
+        let url = try makeCoordinatorVoiceURL(fileName: fileName)
+        defer {
+            try? FileManager.default.removeItem(
+                at: url.deletingLastPathComponent()
+            )
+        }
+
+        coordinator.sendVoiceNote(at: url)
+        #expect(await TestHelpers.waitUntil(
+            { context.privateFileSends.count == 1 },
+            timeout: TestConstants.longTimeout
+        ))
+        let messageID = try #require(
+            context.privateChats[peerID]?.first?.id
+        )
+        let transferID = try #require(
+            context.privateFileSends.first?.transferId
+        )
+
+        coordinator.cancelMediaSend(messageID: messageID)
+        coordinator.handleTransferEvent(.cancelled(
+            id: transferID,
+            sentFragments: 0,
+            totalFragments: 1
+        ))
+
+        #expect(coordinator.retainedReconnectRetryCount == 0)
+        #expect(coordinator.retainedReconnectRetryBytes == 0)
+        #expect(context.cancelledTransfers == [transferID])
+        #expect(context.removedMessages.map(\.messageID) == [
+            messageID
+        ])
+        #expect(!context.deliveryStatusUpdates.contains {
+            if case .failed = $0.status { return true }
+            return false
+        })
+    }
+}
+
+private func makeCoordinatorVoiceURL(
+    fileName: String,
+    bytes: Data = Data("voice".utf8)
+) throws -> URL {
+    let directory = FileManager.default.temporaryDirectory
+        .appendingPathComponent(
+            "media-retry-\(UUID().uuidString)",
+            isDirectory: true
+        )
+    try FileManager.default.createDirectory(
+        at: directory,
+        withIntermediateDirectories: true
+    )
+    let url = directory.appendingPathComponent(fileName)
+    try bytes.write(to: url)
+    return url
 }
 
 private final class PausedImagePreparer: @unchecked Sendable {

bitchatTests/ChatNostrCoordinatorContextTests.swift

@@ -243,7 +243,7 @@ private func drainMainQueue() async {
 
 /// Exercises `ChatNostrCoordinator` against `MockChatNostrContext` with no
 /// `ChatViewModel`. Scoped to the inbound event pipeline (dedup, presence,
-/// public-message ingest), gift-wrap DM ingest, key mapping, channel-switch
+/// public-message ingest), private-envelope ingest, key mapping, channel-switch
 /// teardown, embedded ack flows, and — now that favorites and notifications
 /// are injected through the context — the favorite-notification ingest and
 /// the sampled-geohash notification cooldown. Flows that hit live singletons
@@ -335,7 +335,7 @@ struct ChatNostrCoordinatorContextTests {
     }
 
     @Test @MainActor
-    func handleGiftWrap_routesEmbeddedPrivateMessageAndDeduplicates() async throws {
+    func handlePrivateEnvelope_routesEmbeddedPrivateMessageAndDeduplicates() async throws {
         let context = MockChatNostrContext()
         let coordinator = ChatNostrCoordinator(context: context)
 
@@ -346,17 +346,21 @@ struct ChatNostrCoordinatorContextTests {
             messageID: "gm-1",
             senderPeerID: PeerID(str: "aabbccddeeff0011")
         ))
-        let giftWrap = try NostrProtocol.createPrivateMessage(
+        let envelopes = try NostrProtocol.createPrivateEnvelopePublicationBatch(
             content: embedded,
             recipientPubkey: recipient.publicKeyHex,
             senderIdentity: sender
         )
 
-        coordinator.inbound.handleGiftWrap(giftWrap, id: recipient)
+        for envelope in envelopes {
+            coordinator.inbound.handlePrivateEnvelope(envelope, id: recipient)
+        }
 
         let convKey = PeerID(nostr_: sender.publicKeyHex)
-        #expect(context.recordedNostrEventIDs == [giftWrap.id])
+        #expect(context.recordedNostrEventIDs == envelopes.map(\.id))
         #expect(context.nostrKeyMapping[convKey] == sender.publicKeyHex)
+        // The primary and compatibility envelopes carry the same authenticated
+        // embedded payload and must invoke message side effects only once.
         #expect(context.handledPrivateMessages.count == 1)
         #expect(context.handledPrivateMessages.first?.senderPubkey == sender.publicKeyHex)
         #expect(context.handledPrivateMessages.first?.convKey == convKey)
@@ -368,34 +372,84 @@ struct ChatNostrCoordinatorContextTests {
         #expect(pm.messageID == "gm-1")
         #expect(pm.content == "psst")
 
-        // The same gift wrap is dropped on replay.
-        coordinator.inbound.handleGiftWrap(giftWrap, id: recipient)
-        #expect(context.recordedNostrEventIDs == [giftWrap.id])
+        // The same private envelope is dropped on replay.
+        coordinator.inbound.handlePrivateEnvelope(envelopes[0], id: recipient)
+        #expect(context.recordedNostrEventIDs == envelopes.map(\.id))
         #expect(context.handledPrivateMessages.count == 1)
     }
 
     @Test @MainActor
-    func processNostrMessage_invalidSignatureDoesNotPoisonDedup() async throws {
+    func migrationEnvelopePairs_processEachMessageAndAckOnlyOnce() throws {
+        let context = MockChatNostrContext()
+        let coordinator = ChatNostrCoordinator(context: context)
+        let recipient = try NostrIdentity.generate()
+        let sender = try NostrIdentity.generate()
+        let messageContent = try #require(NostrEmbeddedBitChat.encodePMForNostrNoRecipient(
+            content: "migration message",
+            messageID: "migration-message-id",
+            senderPeerID: PeerID(str: "aabbccddeeff0011")
+        ))
+        let deliveredContent = try #require(NostrEmbeddedBitChat.encodeAckForNostrNoRecipient(
+            type: .delivered,
+            messageID: "migration-ack-id",
+            senderPeerID: PeerID(str: "aabbccddeeff0011")
+        ))
+        let readContent = try #require(NostrEmbeddedBitChat.encodeAckForNostrNoRecipient(
+            type: .readReceipt,
+            messageID: "migration-ack-id",
+            senderPeerID: PeerID(str: "aabbccddeeff0011")
+        ))
+
+        for content in [messageContent, deliveredContent, readContent] {
+            let envelopes = try NostrProtocol.createPrivateEnvelopePublicationBatch(
+                content: content,
+                recipientPubkey: recipient.publicKeyHex,
+                senderIdentity: sender
+            )
+            #expect(envelopes.count == 2)
+            for envelope in envelopes {
+                coordinator.inbound.handlePrivateEnvelope(envelope, id: recipient)
+            }
+        }
+
+        #expect(context.handledPrivateMessages.count == 1)
+        #expect(context.handledDelivered.count == 1)
+        #expect(context.handledReadReceipts.count == 1)
+
+        // A later same-format re-envelope is a delivery retry, not the
+        // migration twin, so it must still reach downstream message-ID dedup
+        // and acknowledgement resend logic.
+        let primaryRetry = try NostrProtocol.createPrivateEnvelope(
+            content: messageContent,
+            recipientPubkey: recipient.publicKeyHex,
+            senderIdentity: sender
+        )
+        coordinator.inbound.handlePrivateEnvelope(primaryRetry, id: recipient)
+        #expect(context.handledPrivateMessages.count == 2)
+    }
+
+    @Test @MainActor
+    func processAccountPrivateEnvelope_invalidSignatureDoesNotPoisonDedup() async throws {
         let context = MockChatNostrContext()
         let coordinator = ChatNostrCoordinator(context: context)
 
         let recipient = try NostrIdentity.generate()
         let sender = try NostrIdentity.generate()
-        let giftWrap = try NostrProtocol.createPrivateMessage(
+        let envelope = try NostrProtocol.createPrivateEnvelope(
             content: "verify:noop",
             recipientPubkey: recipient.publicKeyHex,
             senderIdentity: sender
         )
-        var invalidGiftWrap = giftWrap
-        invalidGiftWrap.sig = String(repeating: "0", count: 128)
+        var invalidEnvelope = envelope
+        invalidEnvelope.sig = String(repeating: "0", count: 128)
 
         // A forged-signature copy is rejected WITHOUT entering the dedup set...
-        await coordinator.inbound.processNostrMessage(invalidGiftWrap)
+        await coordinator.inbound.processAccountPrivateEnvelope(invalidEnvelope)
         #expect(context.recordedNostrEventIDs.isEmpty)
 
         // ...so the genuine event with the same ID still processes and records.
-        await coordinator.inbound.processNostrMessage(giftWrap)
-        #expect(context.recordedNostrEventIDs == [giftWrap.id])
+        await coordinator.inbound.processAccountPrivateEnvelope(envelope)
+        #expect(context.recordedNostrEventIDs == [envelope.id])
     }
 
     @Test @MainActor

bitchatTests/ChatPrivateConversationCoordinatorContextTests.swift

@@ -176,6 +176,7 @@ private final class MockChatPrivateConversationContext: ChatPrivateConversationC
     private(set) var geoPrivateMessages: [(content: String, recipientHex: String, messageID: String)] = []
     private(set) var geoDeliveryAcks: [(messageID: String, recipientHex: String)] = []
     private(set) var geoReadReceipts: [(messageID: String, recipientHex: String)] = []
+    var geohashPrivateMessageAccepted = true
 
     func routePrivateMessage(_ content: String, to peerID: PeerID, recipientNickname: String, messageID: String) {
         routedPrivateMessages.append((content, peerID, messageID))
@@ -191,8 +192,14 @@ private final class MockChatPrivateConversationContext: ChatPrivateConversationC
         meshReadReceipts.append((receipt.originalMessageID, peerID))
     }
 
-    func sendGeohashPrivateMessage(_ content: String, toRecipientHex recipientHex: String, from identity: NostrIdentity, messageID: String) {
+    func sendGeohashPrivateMessage(
+        _ content: String,
+        toRecipientHex recipientHex: String,
+        from identity: NostrIdentity,
+        messageID: String
+    ) -> Bool {
         geoPrivateMessages.append((content, recipientHex, messageID))
+        return geohashPrivateMessageAccepted
     }
 
     func sendGeohashDeliveryAck(for messageID: String, toRecipientHex recipientHex: String, from identity: NostrIdentity) {
@@ -279,6 +286,11 @@ private func isRead(_ status: DeliveryStatus?, by expected: String) -> Bool {
     return false
 }
 
+private func isFailed(_ status: DeliveryStatus?) -> Bool {
+    if case .failed = status { return true }
+    return false
+}
+
 private func makeFavoriteRelationship(
     noiseKey: Data,
     nostrPublicKey: String? = nil,
@@ -412,6 +424,25 @@ struct ChatPrivateConversationCoordinatorContextTests {
         #expect(context.privateChats[convKey]?.count == 1)
     }
 
+    @Test @MainActor
+    func sendGeohashDM_rejectedAdmissionNeverBecomesSent() async {
+        let context = MockChatPrivateConversationContext()
+        let coordinator = ChatPrivateConversationCoordinator(context: context)
+        let recipientHex = String(repeating: "33", count: 32)
+        let peerID = PeerID(nostr_: recipientHex)
+        context.activeChannel = .location(
+            GeohashChannel(level: .city, geohash: "u4pruy")
+        )
+        context.nostrKeyMapping[peerID] = recipientHex
+        context.geohashPrivateMessageAccepted = false
+
+        coordinator.sendGeohashDM("rejected", to: peerID)
+
+        #expect(context.geoPrivateMessages.map(\.content) == ["rejected"])
+        #expect(context.privateChats[peerID]?.count == 1)
+        #expect(isFailed(context.privateChats[peerID]?.first?.deliveryStatus))
+    }
+
     @Test @MainActor
     func handleViewingThisChat_clearsUnreadAndSendsRoutedReadReceiptOnce() async {
         let context = MockChatPrivateConversationContext()

bitchatTests/ChatVerificationCoordinatorContextTests.swift

@@ -97,6 +97,7 @@ private final class MockChatVerificationContext: ChatVerificationContext {
     var noiseSessionKeysByPeerID: [PeerID: Data] = [:]
     private(set) var installedCallbacks: (onPeerAuthenticated: (PeerID, String) -> Void, onHandshakeRequired: (PeerID) -> Void)?
     private(set) var triggeredHandshakes: [PeerID] = []
+    private(set) var privateMediaAuthenticatedPeers: [PeerID] = []
     private(set) var sentChallenges: [(peerID: PeerID, noiseKeyHex: String, nonceA: Data)] = []
     private(set) var sentResponses: [(peerID: PeerID, noiseKeyHex: String, nonceA: Data)] = []
 
@@ -113,6 +114,9 @@ private final class MockChatVerificationContext: ChatVerificationContext {
         establishedNoiseSessions.contains(peerID)
     }
     func triggerHandshake(with peerID: PeerID) { triggeredHandshakes.append(peerID) }
+    func privateMediaPeerDidAuthenticate(_ peerID: PeerID) {
+        privateMediaAuthenticatedPeers.append(peerID)
+    }
 
     func sendVerifyChallenge(to peerID: PeerID, noiseKeyHex: String, nonceA: Data) {
         sentChallenges.append((peerID, noiseKeyHex, nonceA))
@@ -277,6 +281,7 @@ struct ChatVerificationCoordinatorContextTests {
         #expect(context.encryptionStatuses[peerID] == .noiseVerified)
         #expect(context.stablePeerIDCache[peerID] == PeerID(hexData: noiseKey))
         #expect(context.invalidatedEncryptionCachePeers.contains(peerID))
+        #expect(context.privateMediaAuthenticatedPeers == [peerID])
 
         // Handshake required -> handshaking status.
         callbacks?.onHandshakeRequired(peerID)

bitchatTests/ChatViewModelExtensionsTests.swift

@@ -393,20 +393,25 @@ struct ChatViewModelNostrExtensionTests {
     }
 
     @Test @MainActor
-    func subscribeGiftWrap_rejectsOversizedEmbeddedPacket() async throws {
+    func privateEnvelope_rejectsOversizedEmbeddedPacketBeforePublication() async throws {
         let (viewModel, _) = makeTestableViewModel()
         let sender = try NostrIdentity.generate()
         let recipient = try NostrIdentity.generate()
 
         let oversized = Data(repeating: 0x41, count: FileTransferLimits.maxFramedFileBytes + 1)
         let content = "bitchat1:" + base64URLEncode(oversized)
-        let giftWrap = try NostrProtocol.createPrivateMessage(
-            content: content,
-            recipientPubkey: recipient.publicKeyHex,
-            senderIdentity: sender
-        )
-
-        viewModel.subscribeGiftWrap(giftWrap, id: recipient)
+        do {
+            _ = try NostrProtocol.createPrivateEnvelope(
+                content: content,
+                recipientPubkey: recipient.publicKeyHex,
+                senderIdentity: sender
+            )
+            Issue.record("Expected oversized private-envelope plaintext to be rejected")
+        } catch NostrError.invalidCiphertext {
+            // Rejected before encryption/publication, as intended.
+        } catch {
+            Issue.record("Expected NostrError.invalidCiphertext, got \(error)")
+        }
 
         try? await Task.sleep(nanoseconds: 100_000_000)
         #expect(viewModel.privateChats.isEmpty)
@@ -451,7 +456,7 @@ struct ChatViewModelNostrExtensionTests {
     }
 
     @Test @MainActor
-    func subscribeGiftWrap_deliveredAckUpdatesExistingMessage() async throws {
+    func subscribePrivateEnvelope_deliveredAckUpdatesExistingMessage() async throws {
         let (viewModel, _) = makeTestableViewModel()
         let sender = try NostrIdentity.generate()
         let recipient = try NostrIdentity.generate()
@@ -473,13 +478,13 @@ struct ChatViewModelNostrExtensionTests {
         ], for: convKey)
 
         let content = try ackContent(type: .delivered, messageID: messageID, senderPeerID: PeerID(str: "0123456789abcdef"))
-        let giftWrap = try NostrProtocol.createPrivateMessage(
+        let envelope = try NostrProtocol.createPrivateEnvelope(
             content: content,
             recipientPubkey: recipient.publicKeyHex,
             senderIdentity: sender
         )
 
-        viewModel.subscribeGiftWrap(giftWrap, id: recipient)
+        viewModel.subscribePrivateEnvelope(envelope, id: recipient)
 
         let didUpdate = await TestHelpers.waitUntil(
             { isDelivered(status: deliveryStatus(in: viewModel, peerID: convKey, messageID: messageID)) },
@@ -489,7 +494,7 @@ struct ChatViewModelNostrExtensionTests {
     }
 
     @Test @MainActor
-    func subscribeGiftWrap_readAckUpdatesExistingMessage() async throws {
+    func subscribePrivateEnvelope_readAckUpdatesExistingMessage() async throws {
         let (viewModel, _) = makeTestableViewModel()
         let sender = try NostrIdentity.generate()
         let recipient = try NostrIdentity.generate()
@@ -511,13 +516,13 @@ struct ChatViewModelNostrExtensionTests {
         ], for: convKey)
 
         let content = try ackContent(type: .readReceipt, messageID: messageID, senderPeerID: PeerID(str: "0123456789abcdef"))
-        let giftWrap = try NostrProtocol.createPrivateMessage(
+        let envelope = try NostrProtocol.createPrivateEnvelope(
             content: content,
             recipientPubkey: recipient.publicKeyHex,
             senderIdentity: sender
         )
 
-        viewModel.subscribeGiftWrap(giftWrap, id: recipient)
+        viewModel.subscribePrivateEnvelope(envelope, id: recipient)
 
         let didUpdate = await TestHelpers.waitUntil(
             { isRead(status: deliveryStatus(in: viewModel, peerID: convKey, messageID: messageID)) },
@@ -527,28 +532,28 @@ struct ChatViewModelNostrExtensionTests {
     }
 
     @Test @MainActor
-    func handleGiftWrap_privateMessageStoresConversationAndMapping() async throws {
+    func handlePrivateEnvelope_privateMessageStoresConversationAndMapping() async throws {
         let (viewModel, _) = makeTestableViewModel()
         let sender = try NostrIdentity.generate()
         let recipient = try NostrIdentity.generate()
-        let messageID = "gift-private"
+        let messageID = "envelope-private"
         let convKey = PeerID(nostr_: sender.publicKeyHex)
 
         let content = try privateMessageContent(
-            text: "Hello from gift wrap",
+            text: "Hello from private envelope",
             messageID: messageID,
             senderPeerID: PeerID(str: "0123456789abcdef")
         )
-        let giftWrap = try NostrProtocol.createPrivateMessage(
+        let envelope = try NostrProtocol.createPrivateEnvelope(
             content: content,
             recipientPubkey: recipient.publicKeyHex,
             senderIdentity: sender
         )
 
-        viewModel.handleGiftWrap(giftWrap, id: recipient)
+        viewModel.handlePrivateEnvelope(envelope, id: recipient)
 
         let didStore = await TestHelpers.waitUntil(
-            { viewModel.privateChats[convKey]?.first?.content == "Hello from gift wrap" },
+            { viewModel.privateChats[convKey]?.first?.content == "Hello from private envelope" },
             timeout: 5.0
         )
         #expect(didStore)
@@ -557,11 +562,11 @@ struct ChatViewModelNostrExtensionTests {
     }
 
     @Test @MainActor
-    func handleGiftWrap_blockedSenderSkipsMessageStorage() async throws {
+    func handlePrivateEnvelope_blockedSenderSkipsMessageStorage() async throws {
         let (viewModel, _) = makeTestableViewModel()
         let sender = try NostrIdentity.generate()
         let recipient = try NostrIdentity.generate()
-        let messageID = "gift-blocked"
+        let messageID = "envelope-blocked"
         let convKey = PeerID(nostr_: sender.publicKeyHex)
 
         viewModel.identityManager.setNostrBlocked(sender.publicKeyHex, isBlocked: true)
@@ -571,13 +576,13 @@ struct ChatViewModelNostrExtensionTests {
             messageID: messageID,
             senderPeerID: PeerID(str: "0123456789abcdef")
         )
-        let giftWrap = try NostrProtocol.createPrivateMessage(
+        let envelope = try NostrProtocol.createPrivateEnvelope(
             content: content,
             recipientPubkey: recipient.publicKeyHex,
             senderIdentity: sender
         )
 
-        viewModel.handleGiftWrap(giftWrap, id: recipient)
+        viewModel.handlePrivateEnvelope(envelope, id: recipient)
 
         try? await Task.sleep(nanoseconds: 50_000_000)
         #expect(viewModel.privateChats[convKey] == nil)
@@ -585,12 +590,12 @@ struct ChatViewModelNostrExtensionTests {
     }
 
     @Test @MainActor
-    func handleGiftWrap_deliveredAckUpdatesExistingMessage() async throws {
+    func handlePrivateEnvelope_deliveredAckUpdatesExistingMessage() async throws {
         let (viewModel, _) = makeTestableViewModel()
         let sender = try NostrIdentity.generate()
         let recipient = try NostrIdentity.generate()
         let convKey = PeerID(nostr_: sender.publicKeyHex)
-        let messageID = "gift-delivered"
+        let messageID = "envelope-delivered"
 
         viewModel.seedPrivateChat([
             BitchatMessage(
@@ -607,13 +612,13 @@ struct ChatViewModelNostrExtensionTests {
         ], for: convKey)
 
         let content = try ackContent(type: .delivered, messageID: messageID, senderPeerID: PeerID(str: "0123456789abcdef"))
-        let giftWrap = try NostrProtocol.createPrivateMessage(
+        let envelope = try NostrProtocol.createPrivateEnvelope(
             content: content,
             recipientPubkey: recipient.publicKeyHex,
             senderIdentity: sender
         )
 
-        viewModel.handleGiftWrap(giftWrap, id: recipient)
+        viewModel.handlePrivateEnvelope(envelope, id: recipient)
 
         let didUpdate = await TestHelpers.waitUntil(
             { isDelivered(status: deliveryStatus(in: viewModel, peerID: convKey, messageID: messageID)) },
@@ -781,6 +786,63 @@ struct ChatViewModelGeoDMTests {
         #expect(isFailed(status: viewModel.privateChats[convKey]?.last?.deliveryStatus))
     }
 
+    @Test @MainActor
+    func geohashTerminalRelayFailure_transitionsSentMessageToFailed() async throws {
+        let (viewModel, _) = makeTestableViewModel()
+        let sender = try NostrIdentity.generate()
+        let recipient = try NostrIdentity.generate()
+        let messageID = "geo-terminal-failure"
+        let convKey = PeerID(nostr_: recipient.publicKeyHex)
+        let message = BitchatMessage(
+            id: messageID,
+            sender: viewModel.nickname,
+            content: "queued geohash message",
+            timestamp: Date(),
+            isRelay: false,
+            isPrivate: true,
+            recipientNickname: "recipient",
+            senderPeerID: viewModel.myPeerID,
+            deliveryStatus: .sent
+        )
+        viewModel.seedPrivateChat([message], for: convKey)
+
+        var terminalFailure: (@MainActor () -> Void)?
+        let dependencies = NostrTransport.Dependencies(
+            notificationCenter: NotificationCenter(),
+            loadFavorites: { [:] },
+            favoriteStatusForNoiseKey: { _ in nil },
+            favoriteStatusForPeerID: { _ in nil },
+            currentIdentity: { sender },
+            registerPendingPrivateEnvelope: { _ in },
+            sendPrivateEnvelopeBatch: { _, failure in
+                terminalFailure = failure
+                return true
+            },
+            scheduleAfter: { _, _ in },
+            relayConnectivity: {
+                Just(false).eraseToAnyPublisher()
+            }
+        )
+        let transport = viewModel.makeGeohashNostrTransport(
+            dependencies: dependencies
+        )
+
+        let accepted = transport.sendPrivateMessageGeohash(
+            content: message.content,
+            toRecipientHex: recipient.publicKeyHex,
+            from: sender,
+            messageID: messageID
+        )
+
+        #expect(accepted)
+        #expect(viewModel.privateChats[convKey]?.first?.deliveryStatus == .sent)
+        let fail = try #require(terminalFailure)
+        fail()
+        #expect(isFailed(
+            status: viewModel.privateChats[convKey]?.first?.deliveryStatus
+        ))
+    }
+
     /// The blocked notice belongs in the DM thread the person is typing in,
     /// not on the active location-channel timeline.
     @Test @MainActor

bitchatTests/ChatViewModelTests.swift

@@ -1194,6 +1194,759 @@ struct ChatViewModelBluetoothTests {
     }
 }
 
+// MARK: - Private Media Deletion Tests
+
+struct ChatViewModelPrivateMediaDeletionTests {
+
+    @Test @MainActor
+    func deleteMediaMessageTombstonesIncomingButNotOutgoingStableMedia() {
+        let (viewModel, transport) = makeTestableViewModel()
+        let peerID = PeerID(str: String(repeating: "8", count: 64))
+        let incomingID = "media-\(String(repeating: "e", count: 32))"
+        let outgoingID = "media-\(String(repeating: "f", count: 32))"
+        viewModel.seedPrivateChat([
+            privateMediaMessage(
+                id: incomingID,
+                sender: "Peer",
+                senderPeerID: peerID,
+                recipient: viewModel.nickname,
+                filename: "incoming.jpg"
+            ),
+            privateMediaMessage(
+                id: outgoingID,
+                sender: viewModel.nickname,
+                senderPeerID: transport.myPeerID,
+                recipient: "Peer",
+                filename: "outgoing.jpg"
+            )
+        ], for: peerID)
+
+        viewModel.deleteMediaMessage(messageID: outgoingID)
+        #expect(transport.deletedPrivateMediaMessageIDBatches.isEmpty)
+        #expect(viewModel.privateChats[peerID]?.map(\.id) == [incomingID])
+
+        viewModel.deleteMediaMessage(messageID: incomingID)
+        #expect(
+            transport.deletedPrivateMediaMessageIDBatches == [[incomingID]]
+        )
+        #expect(
+            transport.deletedPrivateMediaRelativePaths
+                == [[incomingID: "images/incoming/incoming.jpg"]]
+        )
+        #expect((viewModel.privateChats[peerID] ?? []).isEmpty)
+    }
+
+    @Test @MainActor
+    func stableDeleteProtectsPathSharedWithLegacyBubble() {
+        let (viewModel, transport) = makeTestableViewModel()
+        transport.persistDeletedPrivateMediaResult = false
+        let peerID = PeerID(str: String(repeating: "6", count: 64))
+        let stableID = "media-\(String(repeating: "5", count: 32))"
+        let legacyID = UUID().uuidString
+        let filename = "shared-migration.jpg"
+        viewModel.seedPrivateChat([
+            privateMediaMessage(
+                id: stableID,
+                sender: "Peer",
+                senderPeerID: peerID,
+                recipient: viewModel.nickname,
+                filename: filename
+            ),
+            privateMediaMessage(
+                id: legacyID,
+                sender: "Old client",
+                senderPeerID: peerID,
+                recipient: viewModel.nickname,
+                filename: filename
+            )
+        ], for: peerID)
+
+        viewModel.deleteMediaMessage(messageID: stableID)
+
+        #expect(
+            transport.deletedPrivateMediaMessageIDBatches == [[stableID]]
+        )
+        #expect(transport.deletedPrivateMediaRelativePaths == [[:]])
+        #expect(
+            transport.protectedPrivateMediaRelativePaths == [[
+                "images/incoming/\(filename)"
+            ]]
+        )
+        #expect(
+            viewModel.privateChats[peerID]?.map(\.id)
+                == [stableID, legacyID]
+        )
+    }
+
+    @Test @MainActor
+    func legacyIncomingDeleteLeavesAmbiguousPayloadForQuota() throws {
+        let (viewModel, transport) = makeTestableViewModel()
+        let peerID = PeerID(str: String(repeating: "3", count: 64))
+        let incoming = try FileManager.default.url(
+            for: .applicationSupportDirectory,
+            in: .userDomainMask,
+            appropriateFor: nil,
+            create: true
+        )
+        .appendingPathComponent(
+            "files/images/incoming",
+            isDirectory: true
+        )
+        try FileManager.default.createDirectory(
+            at: incoming,
+            withIntermediateDirectories: true
+        )
+        let payload = incoming.appendingPathComponent(
+            "legacy-delete-\(UUID().uuidString).jpg"
+        )
+        try Data([0x01]).write(to: payload)
+        defer { try? FileManager.default.removeItem(at: payload) }
+        let legacyID = UUID().uuidString
+        viewModel.seedPrivateChat([
+            privateMediaMessage(
+                id: legacyID,
+                sender: "Old client",
+                senderPeerID: peerID,
+                recipient: viewModel.nickname,
+                filename: payload.lastPathComponent
+            )
+        ], for: peerID)
+
+        viewModel.deleteMediaMessage(messageID: legacyID)
+
+        #expect(transport.deletedPrivateMediaMessageIDBatches.isEmpty)
+        #expect((viewModel.privateChats[peerID] ?? []).isEmpty)
+        #expect(FileManager.default.fileExists(atPath: payload.path))
+    }
+
+    @Test @MainActor
+    func clearPrivateChatTombstonesIncomingAndCancelsOutgoingBeforeClear() {
+        let (viewModel, transport) = makeTestableViewModel()
+        let peerID = PeerID(str: String(repeating: "1", count: 64))
+        let incomingID = "media-\(String(repeating: "a", count: 32))"
+        let outgoingID = "media-\(String(repeating: "b", count: 32))"
+        viewModel.seedPrivateChat([
+            privateMediaMessage(
+                id: incomingID,
+                sender: "Peer",
+                senderPeerID: peerID,
+                recipient: viewModel.nickname,
+                filename: "incoming.jpg"
+            ),
+            privateMediaMessage(
+                id: outgoingID,
+                sender: viewModel.nickname,
+                senderPeerID: transport.myPeerID,
+                recipient: "Peer",
+                filename: "outgoing.jpg"
+            ),
+            BitchatMessage(
+                id: "ordinary-message",
+                sender: "Peer",
+                content: "hello",
+                timestamp: Date(),
+                isRelay: false,
+                isPrivate: true,
+                recipientNickname: viewModel.nickname,
+                senderPeerID: peerID
+            )
+        ], for: peerID)
+        viewModel.registerTransfer(
+            transferId: "outgoing-clear-transfer",
+            messageID: outgoingID
+        )
+
+        viewModel.clearPrivateChat(peerID)
+
+        #expect(
+            transport.deletedPrivateMediaMessageIDBatches == [[incomingID]]
+        )
+        #expect(
+            transport.deletedPrivateMediaRelativePaths
+                == [[incomingID: "images/incoming/incoming.jpg"]]
+        )
+        #expect(
+            transport.cancelledTransfers == ["outgoing-clear-transfer"]
+        )
+        #expect(viewModel.messageIDToTransferId[outgoingID] == nil)
+        #expect(viewModel.privateChats[peerID]?.isEmpty == true)
+    }
+
+    @Test @MainActor
+    func clearPrivateChatPreservesCapturedMessagesWhenTombstoneFails() {
+        let (viewModel, transport) = makeTestableViewModel()
+        transport.persistDeletedPrivateMediaResult = false
+        let peerID = PeerID(str: String(repeating: "2", count: 64))
+        let incomingID = "media-\(String(repeating: "c", count: 32))"
+        let outgoingID = "media-\(String(repeating: "7", count: 32))"
+        viewModel.seedPrivateChat([
+            privateMediaMessage(
+                id: incomingID,
+                sender: "Peer",
+                senderPeerID: peerID,
+                recipient: viewModel.nickname,
+                filename: "incoming.jpg"
+            ),
+            privateMediaMessage(
+                id: outgoingID,
+                sender: viewModel.nickname,
+                senderPeerID: transport.myPeerID,
+                recipient: "Peer",
+                filename: "outgoing.jpg"
+            ),
+            BitchatMessage(
+                id: "ordinary-message",
+                sender: "Peer",
+                content: "keep me on failure",
+                timestamp: Date(),
+                isRelay: false,
+                isPrivate: true,
+                recipientNickname: viewModel.nickname,
+                senderPeerID: peerID
+            )
+        ], for: peerID)
+        viewModel.registerTransfer(
+            transferId: "failed-clear-outgoing",
+            messageID: outgoingID
+        )
+
+        viewModel.clearPrivateChat(peerID)
+
+        #expect(
+            transport.deletedPrivateMediaMessageIDBatches == [[incomingID]]
+        )
+        #expect(
+            viewModel.privateChats[peerID]?.map(\.id)
+                == [incomingID, outgoingID, "ordinary-message"]
+        )
+        #expect(transport.cancelledTransfers == ["failed-clear-outgoing"])
+        #expect(viewModel.messageIDToTransferId[outgoingID] == nil)
+    }
+
+    @Test @MainActor
+    func clearFailurePreservesSameNameIncomingPayload() throws {
+        let (viewModel, transport) = makeTestableViewModel()
+        transport.persistDeletedPrivateMediaResult = false
+        let peerID = PeerID(str: String(repeating: "7", count: 64))
+        let incomingID = "media-\(String(repeating: "8", count: 32))"
+        let outgoingID = "media-\(String(repeating: "9", count: 32))"
+        let filename = "clear-collision-\(UUID().uuidString).jpg"
+        let filesDirectory = try FileManager.default.url(
+            for: .applicationSupportDirectory,
+            in: .userDomainMask,
+            appropriateFor: nil,
+            create: true
+        )
+        .appendingPathComponent("files/images", isDirectory: true)
+        let incomingDirectory = filesDirectory.appendingPathComponent(
+            "incoming",
+            isDirectory: true
+        )
+        let outgoingDirectory = filesDirectory.appendingPathComponent(
+            "outgoing",
+            isDirectory: true
+        )
+        try FileManager.default.createDirectory(
+            at: incomingDirectory,
+            withIntermediateDirectories: true
+        )
+        try FileManager.default.createDirectory(
+            at: outgoingDirectory,
+            withIntermediateDirectories: true
+        )
+        let incomingURL = incomingDirectory.appendingPathComponent(filename)
+        let outgoingURL = outgoingDirectory.appendingPathComponent(filename)
+        try Data("incoming".utf8).write(to: incomingURL, options: .atomic)
+        try Data("outgoing".utf8).write(to: outgoingURL, options: .atomic)
+        defer {
+            try? FileManager.default.removeItem(at: incomingURL)
+            try? FileManager.default.removeItem(at: outgoingURL)
+        }
+        viewModel.seedPrivateChat([
+            privateMediaMessage(
+                id: incomingID,
+                sender: "Peer",
+                senderPeerID: peerID,
+                recipient: viewModel.nickname,
+                filename: filename
+            ),
+            privateMediaMessage(
+                id: outgoingID,
+                sender: viewModel.nickname,
+                senderPeerID: transport.myPeerID,
+                recipient: "Peer",
+                filename: filename
+            )
+        ], for: peerID)
+
+        viewModel.clearPrivateChat(peerID)
+
+        #expect(FileManager.default.fileExists(atPath: incomingURL.path))
+        #expect(FileManager.default.fileExists(atPath: outgoingURL.path))
+        #expect(
+            transport.deletedPrivateMediaRelativePaths
+                == [[incomingID: "images/incoming/\(filename)"]]
+        )
+        #expect(
+            viewModel.privateChats[peerID]?.map(\.id)
+                == [incomingID, outgoingID]
+        )
+    }
+
+    @Test @MainActor
+    func clearPrivateChatPreservesArrivalDuringTombstoneIO() {
+        let (viewModel, transport) = makeTestableViewModel()
+        transport.deferDeletedPrivateMediaPersistence = true
+        let peerID = PeerID(str: String(repeating: "3", count: 64))
+        let incomingID = "media-\(String(repeating: "d", count: 32))"
+        viewModel.seedPrivateChat([
+            privateMediaMessage(
+                id: incomingID,
+                sender: "Peer",
+                senderPeerID: peerID,
+                recipient: viewModel.nickname,
+                filename: "incoming.jpg"
+            ),
+            BitchatMessage(
+                id: "captured-text",
+                sender: "Peer",
+                content: "old",
+                timestamp: Date(),
+                isRelay: false,
+                isPrivate: true,
+                recipientNickname: viewModel.nickname,
+                senderPeerID: peerID
+            )
+        ], for: peerID)
+
+        viewModel.clearPrivateChat(peerID)
+        let arrival = BitchatMessage(
+            id: "concurrent-arrival",
+            sender: "Peer",
+            content: "new",
+            timestamp: Date(),
+            isRelay: false,
+            isPrivate: true,
+            recipientNickname: viewModel.nickname,
+            senderPeerID: peerID
+        )
+        #expect(viewModel.appendPrivateMessage(arrival, to: peerID))
+
+        transport.resolveNextDeletedPrivateMediaPersistence(true)
+
+        #expect(
+            viewModel.privateChats[peerID]?.map(\.id)
+                == ["concurrent-arrival"]
+        )
+    }
+
+    @Test @MainActor
+    func clearPrivateChatPreservesActiveLiveVoiceAssembly() throws {
+        let (viewModel, transport) = makeTestableViewModel()
+        let peerID = PeerID(str: String(repeating: "7", count: 64))
+        viewModel.selectedPrivateChatPeer = peerID
+        let burstID = Data(
+            repeating: 0xE1,
+            count: VoiceBurstPacket.burstIDSize
+        )
+        let start = try #require(VoiceBurstPacket(
+            burstID: burstID,
+            seq: 0,
+            kind: .start(codec: .aacLC16kMono)
+        ))
+        let cancel = try #require(VoiceBurstPacket(
+            burstID: burstID,
+            seq: 1,
+            kind: .canceled
+        ))
+        let coordinator = viewModel.liveVoiceCoordinator
+        defer {
+            coordinator.handleVoiceFramePayload(
+                from: peerID,
+                payload: cancel.encode(),
+                timestamp: Date()
+            )
+        }
+        coordinator.handleVoiceFramePayload(
+            from: peerID,
+            payload: start.encode(),
+            timestamp: Date()
+        )
+        let liveMessage = try #require(
+            viewModel.privateChats[peerID]?.first
+        )
+        #expect(coordinator.isLiveVoiceMessage(liveMessage))
+        let ordinary = BitchatMessage(
+            id: "clear-around-live-voice",
+            sender: "Peer",
+            content: "old text",
+            timestamp: Date(),
+            isRelay: false,
+            isPrivate: true,
+            recipientNickname: viewModel.nickname,
+            senderPeerID: peerID
+        )
+        #expect(viewModel.appendPrivateMessage(ordinary, to: peerID))
+
+        viewModel.clearPrivateChat(peerID)
+
+        #expect(transport.deletedPrivateMediaMessageIDBatches.isEmpty)
+        #expect(
+            viewModel.privateChats[peerID]?.map(\.id)
+                == [liveMessage.id]
+        )
+        #expect(coordinator.isLiveVoiceMessage(liveMessage))
+    }
+
+    @Test @MainActor
+    func overlappingClearsTombstoneTheLastMirroredStableAlias() {
+        let (viewModel, transport) = makeTestableViewModel()
+        transport.deferDeletedPrivateMediaPersistence = true
+        let firstPeerID = PeerID(str: String(repeating: "b", count: 64))
+        let secondPeerID = PeerID(str: String(repeating: "c", count: 64))
+        let sharedID = "media-\(String(repeating: "1", count: 32))"
+        let firstUniqueID = "media-\(String(repeating: "2", count: 32))"
+        let secondUniqueID = "media-\(String(repeating: "3", count: 32))"
+        viewModel.seedPrivateChat([
+            privateMediaMessage(
+                id: sharedID,
+                sender: "Peer",
+                senderPeerID: firstPeerID,
+                recipient: viewModel.nickname,
+                filename: "shared.jpg"
+            ),
+            privateMediaMessage(
+                id: firstUniqueID,
+                sender: "Peer",
+                senderPeerID: firstPeerID,
+                recipient: viewModel.nickname,
+                filename: "first.jpg"
+            )
+        ], for: firstPeerID)
+        viewModel.seedPrivateChat([
+            privateMediaMessage(
+                id: sharedID,
+                sender: "Peer",
+                senderPeerID: secondPeerID,
+                recipient: viewModel.nickname,
+                filename: "shared.jpg"
+            ),
+            privateMediaMessage(
+                id: secondUniqueID,
+                sender: "Peer",
+                senderPeerID: secondPeerID,
+                recipient: viewModel.nickname,
+                filename: "second.jpg"
+            )
+        ], for: secondPeerID)
+
+        viewModel.clearPrivateChat(firstPeerID)
+        viewModel.clearPrivateChat(secondPeerID)
+        let queuedArrival = BitchatMessage(
+            id: "arrival-after-queued-clear",
+            sender: "Peer",
+            content: "new",
+            timestamp: Date(),
+            isRelay: false,
+            isPrivate: true,
+            recipientNickname: viewModel.nickname,
+            senderPeerID: secondPeerID
+        )
+        #expect(viewModel.appendPrivateMessage(
+            queuedArrival,
+            to: secondPeerID
+        ))
+
+        #expect(
+            transport.deletedPrivateMediaMessageIDBatches
+                == [[firstUniqueID]]
+        )
+
+        transport.resolveNextDeletedPrivateMediaPersistence(true)
+
+        #expect(
+            transport.deletedPrivateMediaMessageIDBatches == [
+                [firstUniqueID],
+                [secondUniqueID, sharedID].sorted()
+            ]
+        )
+
+        transport.resolveNextDeletedPrivateMediaPersistence(true)
+
+        #expect((viewModel.privateChats[firstPeerID] ?? []).isEmpty)
+        #expect(
+            viewModel.privateChats[secondPeerID]?.map(\.id)
+                == ["arrival-after-queued-clear"]
+        )
+    }
+
+    @Test @MainActor
+    func clearFollowsCapturedRowsAcrossPeerIdentityMigration() {
+        let (viewModel, transport) = makeTestableViewModel()
+        transport.deferDeletedPrivateMediaPersistence = true
+        let sourcePeerID = PeerID(str: String(repeating: "d", count: 64))
+        let destinationPeerID = PeerID(str: String(repeating: "e", count: 64))
+        let thirdPeerID = PeerID(str: String(repeating: "f", count: 64))
+        let stableID = "media-\(String(repeating: "4", count: 32))"
+        viewModel.selectedPrivateChatPeer = sourcePeerID
+        viewModel.seedPrivateChat([
+            privateMediaMessage(
+                id: stableID,
+                sender: "Peer",
+                senderPeerID: sourcePeerID,
+                recipient: viewModel.nickname,
+                filename: "migrated.jpg"
+            ),
+            BitchatMessage(
+                id: "captured-before-migration",
+                sender: "Peer",
+                content: "old",
+                timestamp: Date(),
+                isRelay: false,
+                isPrivate: true,
+                recipientNickname: viewModel.nickname,
+                senderPeerID: sourcePeerID
+            )
+        ], for: sourcePeerID)
+
+        viewModel.clearPrivateChat(sourcePeerID)
+        viewModel.migratePrivateChat(
+            from: sourcePeerID,
+            to: destinationPeerID
+        )
+        viewModel.selectedPrivateChatPeer = thirdPeerID
+        let arrival = BitchatMessage(
+            id: "arrival-after-migration",
+            sender: "Peer",
+            content: "new",
+            timestamp: Date(),
+            isRelay: false,
+            isPrivate: true,
+            recipientNickname: viewModel.nickname,
+            senderPeerID: destinationPeerID
+        )
+        #expect(viewModel.appendPrivateMessage(
+            arrival,
+            to: destinationPeerID
+        ))
+
+        transport.resolveNextDeletedPrivateMediaPersistence(true)
+
+        #expect(
+            viewModel.privateChats[destinationPeerID]?.map(\.id)
+                == ["arrival-after-migration"]
+        )
+    }
+
+    @Test @MainActor
+    func clearFollowsMigrationWhenOldSourceIsRecreated() {
+        let (viewModel, transport) = makeTestableViewModel()
+        transport.deferDeletedPrivateMediaPersistence = true
+        let sourcePeerID = PeerID(str: String(repeating: "1", count: 64))
+        let destinationPeerID = PeerID(str: String(repeating: "2", count: 64))
+        let stableID = "media-\(String(repeating: "6", count: 32))"
+        viewModel.seedPrivateChat([
+            privateMediaMessage(
+                id: stableID,
+                sender: "Peer",
+                senderPeerID: sourcePeerID,
+                recipient: viewModel.nickname,
+                filename: "migrated-recreated.jpg"
+            ),
+            BitchatMessage(
+                id: "captured-before-recreation",
+                sender: "Peer",
+                content: "old",
+                timestamp: Date(),
+                isRelay: false,
+                isPrivate: true,
+                recipientNickname: viewModel.nickname,
+                senderPeerID: sourcePeerID
+            )
+        ], for: sourcePeerID)
+
+        viewModel.clearPrivateChat(sourcePeerID)
+        viewModel.migratePrivateChat(
+            from: sourcePeerID,
+            to: destinationPeerID
+        )
+        let recreatedArrival = BitchatMessage(
+            id: "arrival-recreating-source",
+            sender: "Peer",
+            content: "new",
+            timestamp: Date(),
+            isRelay: false,
+            isPrivate: true,
+            recipientNickname: viewModel.nickname,
+            senderPeerID: sourcePeerID
+        )
+        #expect(viewModel.appendPrivateMessage(
+            recreatedArrival,
+            to: sourcePeerID
+        ))
+
+        transport.resolveNextDeletedPrivateMediaPersistence(true)
+
+        #expect(
+            (viewModel.privateChats[destinationPeerID] ?? []).isEmpty
+        )
+        #expect(
+            viewModel.privateChats[sourcePeerID]?.map(\.id)
+                == ["arrival-recreating-source"]
+        )
+    }
+
+    @Test @MainActor
+    func clearPrivateChatKeepsMediaReferencedByAnotherConversation() {
+        let (viewModel, transport) = makeTestableViewModel()
+        let firstPeerID = PeerID(str: String(repeating: "4", count: 64))
+        let aliasPeerID = PeerID(str: String(repeating: "5", count: 64))
+        let messageID = "media-\(String(repeating: "6", count: 32))"
+        let message = privateMediaMessage(
+            id: messageID,
+            sender: "Peer",
+            senderPeerID: firstPeerID,
+            recipient: viewModel.nickname,
+            filename: "mirrored.jpg"
+        )
+        viewModel.seedPrivateChat([message], for: firstPeerID)
+        viewModel.seedPrivateChat([message], for: aliasPeerID)
+
+        viewModel.clearPrivateChat(firstPeerID)
+
+        #expect(transport.deletedPrivateMediaMessageIDBatches.isEmpty)
+        #expect(viewModel.privateChats[firstPeerID]?.isEmpty == true)
+        #expect(
+            viewModel.privateChats[aliasPeerID]?.map(\.id) == [messageID]
+        )
+    }
+
+    @Test @MainActor
+    func clearPrivateChatLeavesAmbiguousLegacyFileForQuotaCleanup()
+        throws {
+        let (viewModel, transport) = makeTestableViewModel()
+        let firstPeerID = PeerID(str: String(repeating: "9", count: 64))
+        let aliasPeerID = PeerID(str: String(repeating: "a", count: 64))
+        let incomingDirectory = try FileManager.default.url(
+            for: .applicationSupportDirectory,
+            in: .userDomainMask,
+            appropriateFor: nil,
+            create: true
+        )
+        .appendingPathComponent("files/images/incoming", isDirectory: true)
+        try FileManager.default.createDirectory(
+            at: incomingDirectory,
+            withIntermediateDirectories: true
+        )
+        let fileURL = incomingDirectory.appendingPathComponent(
+            "legacy-clear-\(UUID().uuidString).jpg"
+        )
+        try Data("legacy-image".utf8).write(to: fileURL, options: .atomic)
+        defer { try? FileManager.default.removeItem(at: fileURL) }
+        let message = privateMediaMessage(
+            id: UUID().uuidString,
+            sender: "Old client",
+            senderPeerID: firstPeerID,
+            recipient: viewModel.nickname,
+            filename: fileURL.lastPathComponent
+        )
+        viewModel.seedPrivateChat([message], for: firstPeerID)
+        viewModel.seedPrivateChat([message], for: aliasPeerID)
+
+        viewModel.clearPrivateChat(firstPeerID)
+
+        #expect(transport.deletedPrivateMediaMessageIDBatches.isEmpty)
+        #expect(FileManager.default.fileExists(atPath: fileURL.path))
+        #expect(viewModel.privateChats[aliasPeerID]?.map(\.id) == [message.id])
+
+        viewModel.clearPrivateChat(aliasPeerID)
+
+        #expect(FileManager.default.fileExists(atPath: fileURL.path))
+        #expect((viewModel.privateChats[aliasPeerID] ?? []).isEmpty)
+    }
+
+    @Test @MainActor
+    func panicInvalidatesActiveAndQueuedPrivateChatClears() {
+        let (viewModel, transport) = makeTestableViewModel()
+        transport.deferDeletedPrivateMediaPersistence = true
+        let firstPeerID = PeerID(str: String(repeating: "4", count: 64))
+        let secondPeerID = PeerID(str: String(repeating: "5", count: 64))
+        let firstID = "media-\(String(repeating: "6", count: 32))"
+        let secondID = "media-\(String(repeating: "7", count: 32))"
+        viewModel.seedPrivateChat([
+            privateMediaMessage(
+                id: firstID,
+                sender: "First",
+                senderPeerID: firstPeerID,
+                recipient: viewModel.nickname,
+                filename: "first-pre-panic.jpg"
+            )
+        ], for: firstPeerID)
+        viewModel.seedPrivateChat([
+            privateMediaMessage(
+                id: secondID,
+                sender: "Second",
+                senderPeerID: secondPeerID,
+                recipient: viewModel.nickname,
+                filename: "second-pre-panic.jpg"
+            )
+        ], for: secondPeerID)
+
+        viewModel.clearPrivateChat(firstPeerID)
+        viewModel.clearPrivateChat(secondPeerID)
+        #expect(
+            transport.deletedPrivateMediaMessageIDBatches == [[firstID]]
+        )
+
+        _ = viewModel.panicClearAllData(restartServices: false)
+        viewModel.seedPrivateChat([
+            privateMediaMessage(
+                id: firstID,
+                sender: "First",
+                senderPeerID: firstPeerID,
+                recipient: viewModel.nickname,
+                filename: "first-post-panic.jpg"
+            )
+        ], for: firstPeerID)
+        viewModel.seedPrivateChat([
+            privateMediaMessage(
+                id: secondID,
+                sender: "Second",
+                senderPeerID: secondPeerID,
+                recipient: viewModel.nickname,
+                filename: "second-post-panic.jpg"
+            )
+        ], for: secondPeerID)
+
+        transport.resolveNextDeletedPrivateMediaPersistence(true)
+
+        #expect(
+            transport.deletedPrivateMediaMessageIDBatches == [[firstID]]
+        )
+        #expect(viewModel.privateChats[firstPeerID]?.map(\.id) == [firstID])
+        #expect(viewModel.privateChats[secondPeerID]?.map(\.id) == [secondID])
+    }
+
+    private func privateMediaMessage(
+        id: String,
+        sender: String,
+        senderPeerID: PeerID,
+        recipient: String,
+        filename: String
+    ) -> BitchatMessage {
+        BitchatMessage(
+            id: id,
+            sender: sender,
+            content: "\(MimeType.Category.image.messagePrefix)\(filename)",
+            timestamp: Date(),
+            isRelay: false,
+            isPrivate: true,
+            recipientNickname: recipient,
+            senderPeerID: senderPeerID
+        )
+    }
+}
+
 // MARK: - Panic Clear Tests
 
 struct ChatViewModelPanicTests {

bitchatTests/EndToEnd/PrivateMediaEndToEndTests.swift

@@ -364,6 +364,217 @@ struct PrivateMediaEndToEndTests {
         #expect(alice.privateMediaSendPolicy(to: bob.myPeerID) == .legacyRequiresConsent)
     }
 
+    @Test
+    func privateMediaRetryRequiresExactAuthenticatedBit9Proof() async throws {
+        let root = FileManager.default.temporaryDirectory
+            .appendingPathComponent(
+                "private-media-receipt-proof-\(UUID().uuidString)",
+                isDirectory: true
+            )
+        defer { try? FileManager.default.removeItem(at: root) }
+        let alice = makeService(
+            baseDirectory: root.appendingPathComponent(
+                "alice",
+                isDirectory: true
+            )
+        )
+        let bob = makeService(
+            baseDirectory: root.appendingPathComponent(
+                "bob",
+                isDirectory: true
+            )
+        )
+        let bothCapabilities: PeerCapabilities = [
+            .privateMedia,
+            .privateMediaReceipts
+        ]
+
+        // A public bit-9 announce is discovery only.
+        alice._test_seedConnectedPeer(
+            bob.myPeerID,
+            nickname: "Bob",
+            capabilities: bothCapabilities,
+            noisePublicKey: bob.noiseStaticPublicKeyData()
+        )
+        #expect(
+            alice.authenticatedPrivateMediaReceiptSessionGeneration(
+                to: bob.myPeerID
+            ) == nil
+        )
+
+        let proofs = try await establishSessionCapturingPeerState(
+            alice: alice,
+            bob: bob
+        )
+        #expect(
+            alice.authenticatedPrivateMediaReceiptSessionGeneration(
+                to: bob.myPeerID
+            ) == nil
+        )
+
+        // Bit 8 alone preserves encrypted transfer compatibility but cannot
+        // authorize automatic resend.
+        let privateMediaOnly = try authenticatedPeerStatePacket(
+            from: bob,
+            to: alice,
+            capabilities: .privateMedia
+        )
+        alice._test_handlePacket(
+            privateMediaOnly,
+            fromPeerID: bob.myPeerID
+        )
+        #expect(await TestHelpers.waitUntil(
+            {
+                alice.privateMediaSendPolicy(to: bob.myPeerID)
+                    == .encrypted
+            },
+            timeout: TestConstants.longTimeout
+        ))
+        #expect(
+            alice.authenticatedPrivateMediaReceiptSessionGeneration(
+                to: bob.myPeerID
+            ) == nil
+        )
+
+        let receiptCapable = try authenticatedPeerStatePacket(
+            from: bob,
+            to: alice,
+            capabilities: bothCapabilities
+        )
+        alice._test_handlePacket(
+            receiptCapable,
+            fromPeerID: bob.myPeerID
+        )
+        #expect(await TestHelpers.waitUntil(
+            {
+                alice.authenticatedPrivateMediaReceiptSessionGeneration(
+                    to: bob.myPeerID
+                ) != nil
+            },
+            timeout: TestConstants.longTimeout
+        ))
+
+        bob._test_handlePacket(
+            proofs.alice,
+            fromPeerID: alice.myPeerID
+        )
+        alice._test_onOutboundPacket = nil
+        bob._test_onOutboundPacket = nil
+    }
+
+    @Test
+    func receiptRetryRechecksBit9AtDeferredTransportBoundary() async throws {
+        let root = FileManager.default.temporaryDirectory
+            .appendingPathComponent(
+                "private-media-retry-proof-race-\(UUID().uuidString)",
+                isDirectory: true
+            )
+        defer { try? FileManager.default.removeItem(at: root) }
+        let alice = makeService(
+            baseDirectory: root.appendingPathComponent(
+                "alice",
+                isDirectory: true
+            )
+        )
+        let bob = makeService(
+            baseDirectory: root.appendingPathComponent(
+                "bob",
+                isDirectory: true
+            )
+        )
+        let receiptCapabilities: PeerCapabilities = [
+            .privateMedia,
+            .privateMediaReceipts
+        ]
+        alice._test_seedConnectedPeer(
+            bob.myPeerID,
+            nickname: "Bob",
+            capabilities: receiptCapabilities,
+            noisePublicKey: bob.noiseStaticPublicKeyData()
+        )
+        bob._test_seedConnectedPeer(
+            alice.myPeerID,
+            nickname: "Alice",
+            capabilities: receiptCapabilities,
+            noisePublicKey: alice.noiseStaticPublicKeyData()
+        )
+        try await establishSession(alice: alice, bob: bob)
+        #expect(
+            alice.authenticatedPrivateMediaReceiptSessionGeneration(
+                to: bob.myPeerID
+            ) != nil
+        )
+
+        let privateMediaOnly = try authenticatedPeerStatePacket(
+            from: bob,
+            to: alice,
+            capabilities: .privateMedia
+        )
+        let transferID =
+            "receipt-proof-race-\(UUID().uuidString)"
+        let tap = PacketTap()
+        let boundaryProofs = ReceiptCapabilityRecorder()
+        let rejections = TransferCancellationRecorder()
+        let cancellable = TransferProgressManager.shared.publisher.sink {
+            rejections.record($0)
+        }
+        alice._test_onOutboundPacket = tap.record
+        alice._test_beforePrivateMediaDeferredSend = { id in
+            guard id == transferID else { return }
+            boundaryProofs.record(
+                alice
+                    .authenticatedPrivateMediaReceiptSessionGeneration(
+                        to: bob.myPeerID
+                    ) != nil
+            )
+        }
+        defer {
+            alice._test_beforePrivateMediaDeferredSend = nil
+            alice._test_onOutboundPacket = nil
+        }
+
+        // Rotate authenticated state before the deferred retry reaches its
+        // admission boundary.
+        alice._test_handlePacket(
+            privateMediaOnly,
+            fromPeerID: bob.myPeerID
+        )
+        let content = Data("%PDF-1.7\nreceipt-proof-race".utf8)
+        alice.sendFilePrivateReceiptRetry(
+            BitchatFilePacket(
+                fileName: "receipt-proof-race.pdf",
+                fileSize: UInt64(content.count),
+                mimeType: "application/pdf",
+                content: content
+            ),
+            to: bob.myPeerID,
+            transferId: transferID
+        )
+        #expect(await TestHelpers.waitUntil(
+            { boundaryProofs.snapshot() == [false] },
+            timeout: TestConstants.longTimeout
+        ))
+        await alice._test_drainPrivateMediaSendPipeline()
+
+        #expect(await TestHelpers.waitUntil(
+            { rejections.contains(transferID) },
+            timeout: TestConstants.longTimeout
+        ))
+        #expect(tap.snapshot().allSatisfy {
+            $0.type != MessageType.fileTransfer.rawValue
+                && !(
+                    $0.type == MessageType.noiseEncrypted.rawValue
+                        && $0.version == 2
+                )
+        })
+        let state = alice._test_privateMediaTransferState(
+            transferId: transferID
+        )
+        #expect(!state.admissionActive)
+        #expect(!state.pendingNoise)
+        _ = cancellable
+    }
+
     @Test
     func capabilityAnnounceCannotPoisonPinWithoutMatchingNoiseAuthentication() async throws {
         let root = FileManager.default.temporaryDirectory
@@ -1397,6 +1608,23 @@ private final class PrivateMediaPolicyRecorder: @unchecked Sendable {
     }
 }
 
+private final class ReceiptCapabilityRecorder: @unchecked Sendable {
+    private let lock = NSLock()
+    private var values: [Bool] = []
+
+    func record(_ value: Bool) {
+        lock.lock()
+        values.append(value)
+        lock.unlock()
+    }
+
+    func snapshot() -> [Bool] {
+        lock.lock()
+        defer { lock.unlock() }
+        return values
+    }
+}
+
 private final class MessageCaptureDelegate: BitchatDelegate, @unchecked Sendable {
     private let lock = NSLock()
     private var messages: [BitchatMessage] = []

bitchatTests/Mocks/MockTransport.swift

@@ -14,7 +14,7 @@ import BitFoundation
 
 /// Mock Transport implementation for testing ChatViewModel in isolation.
 /// Records all method calls and allows test code to verify interactions.
-final class MockTransport: Transport {
+final class MockTransport: Transport, PrivateMediaDeletionPersisting {
 
     // MARK: - Protocol Properties
 
@@ -38,6 +38,11 @@ final class MockTransport: Transport {
     private(set) var sentPrivateFiles: [(packet: BitchatFilePacket, peerID: PeerID, transferID: String)] = []
     private(set) var sentPrivateFileLegacyAllowances: [Bool] = []
     private(set) var cancelledTransfers: [String] = []
+    private(set) var deletedPrivateMediaMessageIDBatches: [[String]] = []
+    private(set) var deletedPrivateMediaRelativePaths: [
+        [String: String]
+    ] = []
+    private(set) var protectedPrivateMediaRelativePaths: [Set<String>] = []
     private(set) var sentVerifyChallenges: [(peerID: PeerID, noiseKeyHex: String, nonceA: Data)] = []
     private(set) var sentVerifyResponses: [(peerID: PeerID, noiseKeyHex: String, nonceA: Data)] = []
     private(set) var sentCourierMessages: [(content: String, messageID: String, recipientNoiseKey: Data, couriers: [PeerID])] = []
@@ -60,6 +65,11 @@ final class MockTransport: Transport {
     var peerFingerprints: [PeerID: String] = [:]
     var peerNoiseStates: [PeerID: LazyHandshakeState] = [:]
     var privateMediaPolicies: [PeerID: PrivateMediaSendPolicy] = [:]
+    var persistDeletedPrivateMediaResult = true
+    var deferDeletedPrivateMediaPersistence = false
+    private var pendingDeletedPrivateMediaCompletions: [
+        @MainActor (Bool) -> Void
+    ] = []
     private let mockKeychain = MockKeychain()
 
     // MARK: - Transport Protocol Implementation
@@ -217,6 +227,34 @@ final class MockTransport: Transport {
         cancelledTransfers.append(transferId)
     }
 
+    @MainActor
+    func persistDeletedPrivateMedia(
+        messageIDs: [String],
+        payloadRelativePaths: [String: String],
+        protectedPayloadRelativePaths: Set<String>,
+        completion: @escaping @MainActor (Bool) -> Void
+    ) {
+        deletedPrivateMediaMessageIDBatches.append(messageIDs)
+        deletedPrivateMediaRelativePaths.append(payloadRelativePaths)
+        protectedPrivateMediaRelativePaths.append(
+            protectedPayloadRelativePaths
+        )
+        if deferDeletedPrivateMediaPersistence {
+            pendingDeletedPrivateMediaCompletions.append(completion)
+        } else {
+            completion(persistDeletedPrivateMediaResult)
+        }
+    }
+
+    @MainActor
+    func resolveNextDeletedPrivateMediaPersistence(
+        _ result: Bool? = nil
+    ) {
+        guard !pendingDeletedPrivateMediaCompletions.isEmpty else { return }
+        let completion = pendingDeletedPrivateMediaCompletions.removeFirst()
+        completion(result ?? persistDeletedPrivateMediaResult)
+    }
+
     func sendVerifyChallenge(to peerID: PeerID, noiseKeyHex: String, nonceA: Data) {
         sentVerifyChallenges.append((peerID, noiseKeyHex, nonceA))
     }
@@ -264,6 +302,9 @@ final class MockTransport: Transport {
         sentBroadcastFiles.removeAll()
         sentPrivateFiles.removeAll()
         cancelledTransfers.removeAll()
+        deletedPrivateMediaMessageIDBatches.removeAll()
+        deletedPrivateMediaRelativePaths.removeAll()
+        protectedPrivateMediaRelativePaths.removeAll()
         sentVerifyChallenges.removeAll()
         sentVerifyResponses.removeAll()
         startServicesCallCount = 0

bitchatTests/Nostr/Fixtures/AndroidLegacyPrivateEnvelopeB7f0b33d.json

@@ -0,0 +1 @@
+{"id":"8f4ac4680de5f972a586267bc7b6b5102ba548a34f618bdee47edd08929ee1e8","pubkey":"6981231b5745520fd982f66f485fa1b42f8f91ad25ab32242d4afb839d696b0a","created_at":1783727308,"kind":1059,"tags":[["p","c6047f9441ed7d6d3045406e95c07cd85c778e4b8cef3ca7abac09b95c709ee5"]],"content":"v2:ETvtGOrkDQ2JIiiMFMdxBlrYNLh07-QKmLds0xsjkgs-v54CP4E4uoKl1L_VvKvaREg-EviPQmksd3DOYHrBVAd5E6xuRn1o9vkoss4MYV7I71mu4RfADRt77ohZaNbc-KhrmgyRTgE-WnEsqErax8LUN6GUukjkKncVA9MAmC1WUB1MI1AR8c4BQ0IOc_ubrEqi640a8AeBZaCZOYutCb3ttqNSPBxR63XErE761KNg1uiq5pgBVo8iKvLO-N2ei7IWvQhmDTapBaEU7LexeIdHDEwMdXDoAtr5Nmd54H1VN12tBvk1wXvHnENgZCOLOR5J2E1eSwrFXXBto-ohrNpBaLKIXBTPGEoepa7x0gC0Vrh1OTf4tCI7JJ5UWnkUAQFGUgPGlTRYC8MdESgEthqmdgKT3Jc0N6sylTmv6zSVx5dXqO4fvSLHC6_7it8F_V_8-uAxUYstJz65oK4F9CwOEVglUuUdfn2mN_3cMBzASLOlKvL8jbkwwo5aMBVrShGiEwDix02hfGMNMKf7OKsLlfNiBAVSPh6MQSvAWhxbDCDnWN-yHKWF4TYxbnH70X2KGl_ZD9pXTphKVIpFuRmP7UNM-01oG53NKcv9puBSxAkLbTZd122uFL_zQebxid1ukOXT8WgSB_WYJYoAlQekeu4ITryB4I60vAAzMAa4AppCUNnf6T8jwWxuC-8G0TPf18MTxpeNkzcSpPVyVE0jtLaOwsJDXs_Pg82Id03Qc-b_fWMm9V07UzGmEnMqQ1gBMLmEXHb_4Ebg5X7TdzuXy87O36CJzau7Dm5ZfoalryF-16Z4MxzQOyXb1G61yFthRsGCT6sYi-68YkhPScMf7u_BobtMuGWiMiWoBqN_IrQ_ecMHVfaeEYvpCz5NYlrE26iAktNmzCBUDNcIr6P_nHdb6I3Q1rOOmWwEF7jsLbvnU_w_82_nXE_yfdGsoly24A2wB0L0SpdnyyEWgvKWjjfS3J3vkIVW4_iM0FT0jNelANc2X_ryb3EPTmGenlqm_qRGh86PYk_R07hKYu3ULNEgLzDTijeZ9-bP23tsMXUDdJS2VR7LP5063ygVuSC0J-GL1FmQ2c-DmJaWQSeqp0NN3sCND3pSIRzwQRwChnMNjVB65mJj","sig":"c53f339b19b9de021765588b0ee4f5f1e0c2423a34d35fe2cbcc6ce89e12e2fedbdf88a0b6a9d719c2c8580002c7574f1ace93aedeab1e255b6231d4ebb6f9b2"}

bitchatTests/Nostr/Fixtures/AndroidLegacyPrivateEnvelopeB7f0b33dGenerator.patch

@@ -0,0 +1,29 @@
+diff --git a/app/src/test/kotlin/com/bitchat/android/nostr/NostrProtocolTest.kt b/app/src/test/kotlin/com/bitchat/android/nostr/NostrProtocolTest.kt
+index a5bd956..544a29b 100644
+--- a/app/src/test/kotlin/com/bitchat/android/nostr/NostrProtocolTest.kt
++++ b/app/src/test/kotlin/com/bitchat/android/nostr/NostrProtocolTest.kt
+@@ -10,0 +11,21 @@ class NostrProtocolTest {
++    @Test
++    fun emitCrossPlatformFixtures() {
++        val sender = NostrIdentity.fromPrivateKey(
++            "0000000000000000000000000000000000000000000000000000000000000001"
++        )
++        val recipient = NostrIdentity.fromPrivateKey(
++            "0000000000000000000000000000000000000000000000000000000000000002"
++        )
++        val giftWrap = NostrProtocol.createPrivateMessage(
++            content = "legacy fixture from Android b7f0b33d",
++            recipientPubkey = recipient.publicKeyHex,
++            senderIdentity = sender
++        ).single()
++
++        assertEquals(NostrKind.GIFT_WRAP, giftWrap.kind)
++        assertEquals(listOf(listOf("p", recipient.publicKeyHex)), giftWrap.tags)
++        println("BITCHAT_FIXTURE_EVENT=${gson.toJson(giftWrap)}")
++        println("BITCHAT_FIXTURE_RECIPIENT_PRIVATE_KEY=${recipient.privateKeyHex}")
++        println("BITCHAT_FIXTURE_SENDER_PUBLIC_KEY=${sender.publicKeyHex}")
++    }
++
+     @Test
+     fun decryptPrivateMessage_acceptsAuthenticatedSeal() {
+         val sender = NostrIdentity.generate()

bitchatTests/Nostr/Fixtures/AndroidLegacyPrivateEnvelopeB7f0b33dMetadata.json

@@ -0,0 +1,10 @@
+{
+  "android_commit": "b7f0b33d3a267c770d3d5a65ee2d8c7e755450db",
+  "generator": "NostrProtocol.createPrivateMessage",
+  "generator_patch": "AndroidLegacyPrivateEnvelopeB7f0b33dGenerator.patch",
+  "generator_patch_sha256": "e7ad29d6a247638cc16fb2ec06937266e6a03e7a115ae00913330a86a88fa56a",
+  "gradle_test": "ANDROID_HOME=/opt/homebrew/share/android-commandlinetools ANDROID_SDK_ROOT=/opt/homebrew/share/android-commandlinetools JAVA_HOME=/opt/homebrew/opt/openjdk@17/libexec/openjdk.jdk/Contents/Home ./gradlew testDebugUnitTest --tests com.bitchat.android.nostr.NostrProtocolTest.emitCrossPlatformFixtures --info",
+  "fixture_sha256": "d2df3d0b7ffd84c5cb25e0b3f4a89ad14f72a105bddadab77081f98c661b080e",
+  "recipient_private_key": "0000000000000000000000000000000000000000000000000000000000000002",
+  "sender_public_key": "79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798"
+}

bitchatTests/Nostr/Fixtures/LegacyPrivateEnvelope733098bb.json

@@ -0,0 +1 @@
+{"content":"v2:SorfnTaoQ_Rv0XLKA8b3FZojgaFvnWgx66JR6Gj20ztnorQyL-hUYBZwAa5ohFC6ioR9hlJARJm0cgNTvWgSZuNTcfSAvoMdSG6mXK73kzsp99x351zUB_lc1_5ZXm0qqePAEz3Dl5jj5EsfAb8ZzsCd-BZENCsTwqjqC_hCFl7RitlRfIL2Tq_n4TUFEFandDCplNz3W4L7V07V89aGEoUlhzcwPU44BcxfvQjeqVKq0IRf2AetypoOduPrjSqkv674ubWaRcHtw3Asrqgo5XSYbpOlSk1PF_TttrQSPZGViNe5MuiK2P-7d-XqKXuDf_bUgAzW884KXogbct-wtIJZJbVM-utMd-dHrpC1mY81lgpS4_kPuhj0Z6Ro9hU5nCcEk2K4_vNoSM9m9QbcXP34h47qSPsw9ikmz8UoD00-1fXQVB4YJcBVUSVI06IzbZEWulo8SPXvQ4pJjV3nwPgYqRgwnrNWMNfeuKojlF8yA17UNOWvD2U7r1cs84HL8dxztzX9NdN0DGxvjMILvt3D4eWrMbcSrsIkBgyvV-uskEPd4eX3fc9GmX8MPkMgxRErcxbuq6JBUNXikOJXNH_qspOt4UIw5dCIajrHsKycKd8A_3rSgLEQteirOWMGaD2gOJEzpbe4iT72dmPkvRq7k-wDjLbO5dOSuUvpFM-ipkB07ATJz_1uUcRpl8fD_oSlcdAzdPjGKG5Y-tNv3AcUstkqCi52E5x-aO8EDUNBFi_OCbD86nkTUv1jOpAQwejowSiiOnCZ91zUEg5pRQyhBV0Ozib-j0Wf8S8VAz9M8bqQQaKedPCEowDn6csOKbFdBtqSeROf1XWKCkm1mSJGHWW9V44MiMiHebVrRUpbP0PqvxiIeJE0","created_at":1783710443,"id":"46425f8d4e8007af43abb67b3668b59604bd34c86dee1b1c3702559086927cb9","kind":1059,"pubkey":"960e391e314a7fb00bbdd85eccb0a93c17e981b6fed38487cf891f1ed6b66aeb","sig":"975c88c1c4d11f0b623603f8ecc7c181fea7385e8feacdb4a64a6b4f7536b1337ff556aee165ca337c9ec501cfab3e9703026c6df2b12bb8c702378875f00722","tags":[["p","1c108500bf53da288d30530718bac4bf80d661d1fe38854060c5b5c79eb77755"]]}

bitchatTests/Nostr/Fixtures/LegacyPrivateEnvelope733098bbRecipientKey.json

@@ -0,0 +1 @@
+{"recipient_private_key":"8355a5c110cdfef2e644f4ad5d51c39f253b2c2c80ebb6856379fb16531dc1fa"}

bitchatTests/NostrProtocolTests.swift

@@ -2,18 +2,17 @@
 // NostrProtocolTests.swift
 // bitchatTests
 //
-// Tests for NIP-17 gift-wrapped private messages
+// Tests for BitChat's proprietary private-envelope transport over Nostr.
 //
 
 import Testing
-import CryptoKit
 import Foundation
 import BitFoundation
 @testable import bitchat
 
 struct NostrProtocolTests {
     
-    @Test func nip17MessageRoundTrip() throws {
+    @Test func privateEnvelopeRoundTrip() throws {
         // Create sender and recipient identities
         let sender = try NostrIdentity.generate()
         let recipient = try NostrIdentity.generate()
@@ -22,21 +21,19 @@ struct NostrProtocolTests {
         print("Recipient pubkey: \(recipient.publicKeyHex)")
         
         // Create a test message
-        let originalContent = "Hello from NIP-17 test!"
+        let originalContent = "Hello from BitChat private-envelope test!"
         
-        // Create encrypted gift wrap
-        let giftWrap = try NostrProtocol.createPrivateMessage(
+        let envelope = try NostrProtocol.createPrivateEnvelope(
             content: originalContent,
             recipientPubkey: recipient.publicKeyHex,
             senderIdentity: sender
         )
         
-        print("Gift wrap created with ID: \(giftWrap.id)")
-        print("Gift wrap pubkey: \(giftWrap.pubkey)")
+        print("Private envelope created with ID: \(envelope.id)")
+        print("Private envelope pubkey: \(envelope.pubkey)")
         
-        // Decrypt the gift wrap
-        let (decryptedContent, senderPubkey, timestamp) = try NostrProtocol.decryptPrivateMessage(
-            giftWrap: giftWrap,
+        let (decryptedContent, senderPubkey, timestamp) = try NostrProtocol.decryptPrivateEnvelope(
+            envelope: envelope,
             recipientIdentity: recipient
         )
         
@@ -52,43 +49,410 @@ struct NostrProtocolTests {
         print("✅ Successfully decrypted message: '\(decryptedContent)' from \(senderPubkey) at \(messageDate)")
     }
     
-    @Test func giftWrapUsesUniqueEphemeralKeys() throws {
+    @Test func privateEnvelopesUseUniqueEphemeralKeys() throws {
         // Create identities
         let sender = try NostrIdentity.generate()
         let recipient = try NostrIdentity.generate()
         
         // Create two messages
-        let message1 = try NostrProtocol.createPrivateMessage(
+        let message1 = try NostrProtocol.createPrivateEnvelope(
             content: "Message 1",
             recipientPubkey: recipient.publicKeyHex,
             senderIdentity: sender
         )
         
-        let message2 = try NostrProtocol.createPrivateMessage(
+        let message2 = try NostrProtocol.createPrivateEnvelope(
             content: "Message 2",
             recipientPubkey: recipient.publicKeyHex,
             senderIdentity: sender
         )
         
-        // Gift wrap pubkeys should be different (unique ephemeral keys)
+        // Public envelope keys must be one-time use.
         #expect(message1.pubkey != message2.pubkey)
         
-        print("Message 1 gift wrap pubkey: \(message1.pubkey)")
-        print("Message 2 gift wrap pubkey: \(message2.pubkey)")
+        print("Message 1 envelope pubkey: \(message1.pubkey)")
+        print("Message 2 envelope pubkey: \(message2.pubkey)")
         
         // Both should decrypt successfully
-        let (content1, _, _) = try NostrProtocol.decryptPrivateMessage(
-            giftWrap: message1,
+        let (content1, _, _) = try NostrProtocol.decryptPrivateEnvelope(
+            envelope: message1,
             recipientIdentity: recipient
         )
-        let (content2, _, _) = try NostrProtocol.decryptPrivateMessage(
-            giftWrap: message2,
+        let (content2, _, _) = try NostrProtocol.decryptPrivateEnvelope(
+            envelope: message2,
             recipientIdentity: recipient
         )
         
         #expect(content1 == "Message 1")
         #expect(content2 == "Message 2")
     }
+
+    @Test func privateEnvelopeUsesBitChatWireFormatAtEveryLayer() throws {
+        let sender = try NostrIdentity.generate()
+        let recipient = try NostrIdentity.generate()
+        let envelope = try NostrProtocol.createPrivateEnvelope(
+            content: "bitchat-specific",
+            recipientPubkey: recipient.publicKeyHex,
+            senderIdentity: sender
+        )
+
+        #expect(envelope.kind == NostrProtocol.EventKind.privateEnvelope.rawValue)
+        #expect(envelope.kind != NostrProtocol.EventKind.legacyNIP59GiftWrap.rawValue)
+        #expect(envelope.content.hasPrefix(NostrProtocol.privateEnvelopeContentPrefix))
+        #expect(!envelope.content.hasPrefix("v2:"))
+        #expect(envelope.tags == [["p", recipient.publicKeyHex]])
+        #expect(envelope.created_at <= Int(Date().timeIntervalSince1970))
+
+        let layers = try NostrProtocol.decodePrivateEnvelopeLayersForTesting(
+            envelope: envelope,
+            recipientIdentity: recipient
+        )
+        #expect(layers.seal.kind == NostrProtocol.EventKind.privateSeal.rawValue)
+        #expect(layers.seal.content.hasPrefix(NostrProtocol.privateEnvelopeContentPrefix))
+        #expect(layers.seal.tags.isEmpty)
+        #expect(layers.message.kind == NostrProtocol.EventKind.privateMessage.rawValue)
+        #expect(layers.message.tags.isEmpty)
+        #expect(layers.message.sig == nil)
+    }
+
+    @Test func decryptAcceptsReceiveOnlyLegacyBitChatEnvelope() throws {
+        let sender = try NostrIdentity.generate()
+        let recipient = try NostrIdentity.generate()
+        let envelope = try NostrProtocol.createLegacyPrivateEnvelopeForTesting(
+            content: "legacy in-flight message",
+            recipientPubkey: recipient.publicKeyHex,
+            senderIdentity: sender
+        )
+
+        #expect(envelope.kind == NostrProtocol.EventKind.legacyNIP59GiftWrap.rawValue)
+        #expect(envelope.content.hasPrefix("v2:"))
+
+        let result = try NostrProtocol.decryptPrivateEnvelope(
+            envelope: envelope,
+            recipientIdentity: recipient
+        )
+        #expect(result.content == "legacy in-flight message")
+        #expect(result.senderPubkey == sender.publicKeyHex)
+
+        let layers = try NostrProtocol.decodePrivateEnvelopeLayersForTesting(
+            envelope: envelope,
+            recipientIdentity: recipient
+        )
+        #expect(layers.seal.kind == NostrProtocol.EventKind.legacyNIP59Seal.rawValue)
+        #expect(layers.message.kind == NostrProtocol.EventKind.legacyNIP17DirectMessage.rawValue)
+        #expect(layers.message.tags.isEmpty)
+    }
+
+    @Test func decryptAcceptsCurrentAndroidLegacyInnerRecipientTag() throws {
+        let sender = try NostrIdentity.generate()
+        let recipient = try NostrIdentity.generate()
+
+        // Current Android's `createPrivateMessage` emits an unsigned kind-14
+        // inner event with exactly [["p", recipient]], while its outer/seal
+        // layers use the deployed BitChat legacy v2 crypto. This isolated
+        // generator reproduces that cross-platform wire shape without making
+        // the production encoder depend on Android's historical tag choice.
+        let envelope = try NostrProtocol.createLegacyPrivateEnvelopeForTesting(
+            content: "legacy message from Android",
+            recipientPubkey: recipient.publicKeyHex,
+            senderIdentity: sender,
+            innerMessageTags: [["p", recipient.publicKeyHex]]
+        )
+
+        let layers = try NostrProtocol.decodePrivateEnvelopeLayersForTesting(
+            envelope: envelope,
+            recipientIdentity: recipient
+        )
+        #expect(layers.message.tags == [["p", recipient.publicKeyHex]])
+
+        let result = try NostrProtocol.decryptPrivateEnvelope(
+            envelope: envelope,
+            recipientIdentity: recipient
+        )
+        #expect(result.content == "legacy message from Android")
+        #expect(result.senderPubkey == sender.publicKeyHex)
+    }
+
+    @Test func decryptsFrozenLegacyEnvelopeProducedByAndroidB7f0b33d() throws {
+        let eventData = try Data(contentsOf: fixtureURL(
+            name: "AndroidLegacyPrivateEnvelopeB7f0b33d"
+        ))
+        let metadataData = try Data(contentsOf: fixtureURL(
+            name: "AndroidLegacyPrivateEnvelopeB7f0b33dMetadata"
+        ))
+        let envelope = try JSONDecoder().decode(NostrEvent.self, from: eventData)
+        let metadata = try JSONDecoder().decode(AndroidLegacyEnvelopeFixture.self, from: metadataData)
+        let recipientKey = try #require(Data(hexString: metadata.recipientPrivateKey))
+        let recipient = try NostrIdentity(privateKeyData: recipientKey)
+
+        #expect(metadata.androidCommit == "b7f0b33d3a267c770d3d5a65ee2d8c7e755450db")
+        #expect(metadata.generator == "NostrProtocol.createPrivateMessage")
+        #expect(metadata.generatorPatch == "AndroidLegacyPrivateEnvelopeB7f0b33dGenerator.patch")
+        #expect(metadata.fixtureSHA256 == eventData.sha256Fingerprint())
+        #expect(metadata.gradleTest.contains("NostrProtocolTest.emitCrossPlatformFixtures"))
+        let generatorPatch = try String(contentsOf: fixtureURL(
+            name: "AndroidLegacyPrivateEnvelopeB7f0b33dGenerator",
+            extension: "patch"
+        ))
+        #expect(metadata.generatorPatchSHA256 == Data(generatorPatch.utf8).sha256Fingerprint())
+        #expect(generatorPatch.contains("fun emitCrossPlatformFixtures()"))
+        #expect(generatorPatch.contains(metadata.recipientPrivateKey))
+        #expect(envelope.isValidSignature())
+        #expect(envelope.kind == NostrProtocol.EventKind.legacyNIP59GiftWrap.rawValue)
+        #expect(envelope.tags == [["p", recipient.publicKeyHex]])
+
+        let layers = try NostrProtocol.decodePrivateEnvelopeLayersForTesting(
+            envelope: envelope,
+            recipientIdentity: recipient
+        )
+        #expect(layers.message.tags == [["p", recipient.publicKeyHex]])
+
+        let result = try NostrProtocol.decryptPrivateEnvelope(
+            envelope: envelope,
+            recipientIdentity: recipient
+        )
+        #expect(result.content == "legacy fixture from Android b7f0b33d")
+        #expect(result.senderPubkey == metadata.senderPublicKey)
+    }
+
+    @Test func decryptRejectsAlternateLegacyInnerTags() throws {
+        let sender = try NostrIdentity.generate()
+        let recipient = try NostrIdentity.generate()
+        let otherRecipient = try NostrIdentity.generate()
+        let invalidTagShapes = [
+            [["p", otherRecipient.publicKeyHex]],
+            [["p", recipient.publicKeyHex], ["p", recipient.publicKeyHex]],
+            [["p", recipient.publicKeyHex, "unexpected"]],
+            [["x", recipient.publicKeyHex]]
+        ]
+
+        for tags in invalidTagShapes {
+            let envelope = try NostrProtocol.createLegacyPrivateEnvelopeForTesting(
+                content: "invalid Android-shaped tags",
+                recipientPubkey: recipient.publicKeyHex,
+                senderIdentity: sender,
+                innerMessageTags: tags
+            )
+            expectInvalidEvent {
+                _ = try NostrProtocol.decryptPrivateEnvelope(
+                    envelope: envelope,
+                    recipientIdentity: recipient
+                )
+            }
+        }
+    }
+
+    @Test func newPrivateEnvelopeRejectsInnerRecipientTag() throws {
+        let sender = try NostrIdentity.generate()
+        let recipient = try NostrIdentity.generate()
+        let envelope = try NostrProtocol.createPrivateEnvelopeWithInnerTagsForTesting(
+            content: "new format stays strict",
+            recipientPubkey: recipient.publicKeyHex,
+            senderIdentity: sender,
+            innerMessageTags: [["p", recipient.publicKeyHex]]
+        )
+
+        expectInvalidEvent {
+            _ = try NostrProtocol.decryptPrivateEnvelope(
+                envelope: envelope,
+                recipientIdentity: recipient
+            )
+        }
+    }
+
+    @Test func decryptsFrozenLegacyEnvelopeProducedByRelease733098bb() throws {
+        let eventData = try Data(contentsOf: fixtureURL(
+            name: "LegacyPrivateEnvelope733098bb"
+        ))
+        let keyData = try Data(contentsOf: fixtureURL(
+            name: "LegacyPrivateEnvelope733098bbRecipientKey"
+        ))
+        let envelope = try JSONDecoder().decode(NostrEvent.self, from: eventData)
+        let keyFixture = try JSONDecoder().decode(LegacyRecipientKeyFixture.self, from: keyData)
+        let recipientKey = try #require(Data(hexString: keyFixture.recipientPrivateKey))
+        let recipient = try NostrIdentity(privateKeyData: recipientKey)
+
+        #expect(envelope.isValidSignature())
+        let result = try NostrProtocol.decryptPrivateEnvelope(
+            envelope: envelope,
+            recipientIdentity: recipient
+        )
+        #expect(result.content == "legacy fixture from 733098bb")
+        #expect(result.senderPubkey == "2e3d79df7047204f02b726c574e256f8de1dd80510f7dcb8b0d12df13acb87e6")
+    }
+
+    @Test func publicationBatchAlwaysDualPublishesForCoordinatedMigration() throws {
+        let sender = try NostrIdentity.generate()
+        let recipient = try NostrIdentity.generate()
+
+        let migrationBatch = try NostrProtocol.createPrivateEnvelopePublicationBatch(
+            content: "mixed-version",
+            recipientPubkey: recipient.publicKeyHex,
+            senderIdentity: sender
+        )
+        #expect(migrationBatch.map(\.kind) == [
+            NostrProtocol.EventKind.privateEnvelope.rawValue,
+            NostrProtocol.EventKind.legacyNIP59GiftWrap.rawValue
+        ])
+        for envelope in migrationBatch {
+            let result = try NostrProtocol.decryptPrivateEnvelope(
+                envelope: envelope,
+                recipientIdentity: recipient
+            )
+            #expect(result.content == "mixed-version")
+        }
+
+        // The compatibility copy retains the exact released-iOS legacy shape,
+        // which current Android also accepts: kinds 1059/13/14, v2 prefix, and
+        // no inner tags. There is no wall-clock branch that can silently stop
+        // old-client delivery.
+        let compatibilityLayers = try NostrProtocol.decodePrivateEnvelopeLayersForTesting(
+            envelope: migrationBatch[1],
+            recipientIdentity: recipient
+        )
+        #expect(migrationBatch[1].content.hasPrefix("v2:"))
+        #expect(compatibilityLayers.seal.kind == NostrProtocol.EventKind.legacyNIP59Seal.rawValue)
+        #expect(compatibilityLayers.message.kind == NostrProtocol.EventKind.legacyNIP17DirectMessage.rawValue)
+        #expect(compatibilityLayers.message.tags.isEmpty)
+    }
+
+    @Test func mailboxLookbackCoversDeliveryWindowAndroidFuzzAndClockSkew() {
+        let sentAt = Date(timeIntervalSince1970: 1_800_000_000)
+        let earliestAndroidTimestamp = sentAt.addingTimeInterval(
+            -TransportConfig.nostrLegacyAndroidTimestampFuzzSeconds
+        )
+        let subscribeAtDeliveryBoundary = sentAt.addingTimeInterval(
+            TransportConfig.nostrPrivateEnvelopeDeliveryWindowSeconds
+        )
+        let filterSince = subscribeAtDeliveryBoundary.addingTimeInterval(
+            -TransportConfig.nostrDMSubscribeLookbackSeconds
+        )
+
+        #expect(TransportConfig.nostrPrivateEnvelopeDeliveryWindowSeconds == 24 * 60 * 60)
+        #expect(TransportConfig.nostrLegacyAndroidTimestampFuzzSeconds == 48 * 60 * 60)
+        #expect(TransportConfig.nostrDMSubscribeClockSkewSeconds == 15 * 60)
+        let expectedLookback: TimeInterval = 72 * 60 * 60 + 15 * 60
+        #expect(TransportConfig.nostrDMSubscribeLookbackSeconds == expectedLookback)
+        #expect(filterSince == earliestAndroidTimestamp.addingTimeInterval(-(15 * 60)))
+    }
+
+    @Test func largePrivateEnvelopeFitsLayerSpecificExpansionLimits() throws {
+        let sender = try NostrIdentity.generate()
+        let recipient = try NostrIdentity.generate()
+        // Large enough that the nested Base64 seal exceeds the inner 32 KiB
+        // cap, while the inner message JSON itself remains below that cap.
+        let content = String(repeating: "A", count: 30 * 1024)
+
+        let envelope = try NostrProtocol.createPrivateEnvelope(
+            content: content,
+            recipientPubkey: recipient.publicKeyHex,
+            senderIdentity: sender
+        )
+        let decrypted = try NostrProtocol.decryptPrivateEnvelope(
+            envelope: envelope,
+            recipientIdentity: recipient
+        )
+
+        #expect(decrypted.content == content)
+        #expect(envelope.content.utf8.count <= NostrProtocol.maximumPrivateEnvelopeCiphertextBytes)
+    }
+
+    @Test func privateEnvelopeRejectsOversizedCiphertextBeforeDecoding() throws {
+        let recipient = try NostrIdentity.generate()
+        let wrapper = try NostrIdentity.generate()
+        let oversizedContent = NostrProtocol.privateEnvelopeContentPrefix
+            + String(
+                repeating: "A",
+                count: NostrProtocol.maximumPrivateEnvelopeCiphertextBytes
+            )
+        let event = NostrEvent(
+            pubkey: wrapper.publicKeyHex,
+            createdAt: Date(),
+            kind: .privateEnvelope,
+            tags: [["p", recipient.publicKeyHex]],
+            content: oversizedContent
+        )
+        let signed = try event.sign(with: wrapper.schnorrSigningKey())
+
+        expectInvalidCiphertext {
+            _ = try NostrProtocol.decryptPrivateEnvelope(
+                envelope: signed,
+                recipientIdentity: recipient
+            )
+        }
+    }
+
+    @Test func privateEnvelopeRejectsOversizedPlaintextBeforeEncryption() throws {
+        let sender = try NostrIdentity.generate()
+        let recipient = try NostrIdentity.generate()
+        let oversizedPlaintext = String(
+            repeating: "x",
+            count: NostrProtocol.maximumPrivateEnvelopePlaintextBytes + 1
+        )
+
+        expectInvalidCiphertext {
+            _ = try NostrProtocol.createPrivateEnvelope(
+                content: oversizedPlaintext,
+                recipientPubkey: recipient.publicKeyHex,
+                senderIdentity: sender
+            )
+        }
+    }
+
+    @Test func privateEnvelopePublicationBatchRejectsMaximumComposerPayload() throws {
+        let sender = try NostrIdentity.generate()
+        let recipient = try NostrIdentity.generate()
+        let composerMaximum = String(
+            repeating: "x",
+            count: InputValidator.Limits.maxMessageLength
+        )
+
+        #expect(
+            composerMaximum.utf8.count
+                > NostrProtocol.maximumPrivateEnvelopePlaintextBytes
+        )
+        expectInvalidCiphertext {
+            _ = try NostrProtocol.createPrivateEnvelopePublicationBatch(
+                content: composerMaximum,
+                recipientPubkey: recipient.publicKeyHex,
+                senderIdentity: sender
+            )
+        }
+    }
+
+    @Test func privateEnvelopeRejectsOversizedNestedJSONBeforeParsing() {
+        let oversizedJSON = String(
+            repeating: "{",
+            count: NostrProtocol.maximumPrivateEnvelopePlaintextBytes + 1
+        )
+        expectInvalidCiphertext {
+            _ = try NostrProtocol.decodePrivateEnvelopeEventJSONForTesting(oversizedJSON)
+        }
+    }
+
+    @Test func decryptDoesNotMisinterpretStandardNIP44PayloadAsLegacyBitChat() throws {
+        let recipient = try NostrIdentity.generate()
+        let wrapper = try NostrIdentity.generate()
+        // A valid NIP-44 v2 payload from the official test vectors. Its wire
+        // format starts with a version byte in standard Base64, not BitChat's
+        // historical `v2:` prefix.
+        let standardPayload = "AgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABee0G5VSK0/9YypIObAtDKfYEAjD35uVkHyB0F4DwrcNaCXlCWZKaArsGrY6M9wnuTMxWfp1RTN9Xga8no+kF5Vsb"
+        let event = NostrEvent(
+            pubkey: wrapper.publicKeyHex,
+            createdAt: Date(),
+            kind: .legacyNIP59GiftWrap,
+            tags: [["p", recipient.publicKeyHex]],
+            content: standardPayload
+        )
+        let signed = try event.sign(with: wrapper.schnorrSigningKey())
+
+        expectInvalidCiphertext {
+            _ = try NostrProtocol.decryptPrivateEnvelope(
+                envelope: signed,
+                recipientIdentity: recipient
+            )
+        }
+    }
     
     @Test func decryptionFailsWithWrongRecipient() throws {
         let sender = try NostrIdentity.generate()
@@ -96,68 +460,58 @@ struct NostrProtocolTests {
         let wrongRecipient = try NostrIdentity.generate()
         
         // Create message for recipient
-        let giftWrap = try NostrProtocol.createPrivateMessage(
+        let envelope = try NostrProtocol.createPrivateEnvelope(
             content: "Secret message",
             recipientPubkey: recipient.publicKeyHex,
             senderIdentity: sender
         )
         
-        // Try to decrypt with wrong recipient
-        if #available(macOS 14.4, iOS 17.4, *) {
-            #expect(throws: CryptoKitError.authenticationFailure) {
-                try NostrProtocol.decryptPrivateMessage(
-                    giftWrap: giftWrap,
-                    recipientIdentity: wrongRecipient
-                )
-            }
-        } else {
-            #expect(throws: (any Error).self) {
-                try NostrProtocol.decryptPrivateMessage(
-                    giftWrap: giftWrap,
-                    recipientIdentity: wrongRecipient
-                )
-            }
+        expectInvalidEvent {
+            _ = try NostrProtocol.decryptPrivateEnvelope(
+                envelope: envelope,
+                recipientIdentity: wrongRecipient
+            )
         }
     }
 
     @Test func decryptRejectsInvalidSealSignature() throws {
         let sender = try NostrIdentity.generate()
         let recipient = try NostrIdentity.generate()
-        let giftWrap = try NostrProtocol.createPrivateMessageWithInvalidSealSignatureForTesting(
+        let envelope = try NostrProtocol.createPrivateEnvelopeWithInvalidSealSignatureForTesting(
             content: "forged signature",
             recipientPubkey: recipient.publicKeyHex,
             senderIdentity: sender
         )
 
         expectInvalidEvent {
-            _ = try NostrProtocol.decryptPrivateMessage(
-                giftWrap: giftWrap,
+            _ = try NostrProtocol.decryptPrivateEnvelope(
+                envelope: envelope,
                 recipientIdentity: recipient
             )
         }
     }
 
-    @Test func decryptRejectsSealRumorPubkeyMismatch() throws {
+    @Test func decryptRejectsSealMessagePubkeyMismatch() throws {
         let claimedSender = try NostrIdentity.generate()
         let sealSigner = try NostrIdentity.generate()
         let recipient = try NostrIdentity.generate()
-        let giftWrap = try NostrProtocol.createPrivateMessageWithMismatchedSealRumorPubkeyForTesting(
+        let envelope = try NostrProtocol.createPrivateEnvelopeWithMismatchedSealMessagePubkeyForTesting(
             content: "spoofed sender",
             recipientPubkey: recipient.publicKeyHex,
-            rumorIdentity: claimedSender,
+            messageIdentity: claimedSender,
             sealSignerIdentity: sealSigner
         )
 
         expectInvalidEvent {
-            _ = try NostrProtocol.decryptPrivateMessage(
-                giftWrap: giftWrap,
+            _ = try NostrProtocol.decryptPrivateEnvelope(
+                envelope: envelope,
                 recipientIdentity: recipient
             )
         }
     }
 
     @Test
-    func testAckRoundTripNIP44V2_Delivered() throws {
+    func deliveredAckRoundTripsInsidePrivateEnvelope() throws {
         // Identities
         let sender = try NostrIdentity.generate()
         let recipient = try NostrIdentity.generate()
@@ -171,19 +525,17 @@ struct NostrProtocolTests {
             "Failed to embed delivered ack"
         )
 
-        // Create NIP-17 gift wrap to recipient (uses NIP-44 v2 internally)
-        let giftWrap = try NostrProtocol.createPrivateMessage(
+        let envelope = try NostrProtocol.createPrivateEnvelope(
             content: embedded,
             recipientPubkey: recipient.publicKeyHex,
             senderIdentity: sender
         )
 
-        // Ensure v2 format was used for ciphertext
-        #expect(giftWrap.content.hasPrefix("v2:"))
+        #expect(envelope.content.hasPrefix(NostrProtocol.privateEnvelopeContentPrefix))
 
         // Decrypt as recipient
-        let (content, senderPubkey, _) = try NostrProtocol.decryptPrivateMessage(
-            giftWrap: giftWrap,
+        let (content, senderPubkey, _) = try NostrProtocol.decryptPrivateEnvelope(
+            envelope: envelope,
             recipientIdentity: recipient
         )
 
@@ -208,7 +560,7 @@ struct NostrProtocolTests {
         }
     }
 
-    @Test func ackRoundTripNIP44V2_ReadReceipt() throws {
+    @Test func readReceiptRoundTripsInsidePrivateEnvelope() throws {
         // Identities
         let sender = try NostrIdentity.generate()
         let recipient = try NostrIdentity.generate()
@@ -220,16 +572,16 @@ struct NostrProtocolTests {
             "Failed to embed read ack"
         )
 
-        let giftWrap = try NostrProtocol.createPrivateMessage(
+        let envelope = try NostrProtocol.createPrivateEnvelope(
             content: embedded,
             recipientPubkey: recipient.publicKeyHex,
             senderIdentity: sender
         )
 
-        #expect(giftWrap.content.hasPrefix("v2:"))
+        #expect(envelope.content.hasPrefix(NostrProtocol.privateEnvelopeContentPrefix))
 
-        let (content, senderPubkey, _) = try NostrProtocol.decryptPrivateMessage(
-            giftWrap: giftWrap,
+        let (content, senderPubkey, _) = try NostrProtocol.decryptPrivateEnvelope(
+            envelope: envelope,
             recipientIdentity: recipient
         )
         #expect(senderPubkey == sender.publicKeyHex)
@@ -290,7 +642,6 @@ struct NostrProtocolTests {
         #expect(object["limit"] as? Int == 42)
     }
 
-
     @Test func inboundNostrEventRejectsTooManyTags() throws {
         var eventDict = Self.validInboundEventDict()
         eventDict["tags"] = Array(
@@ -336,6 +687,33 @@ struct NostrProtocolTests {
         #expect(event.tags.count == 2)
     }
 
+    @Test func privateEnvelopeFiltersGiveEachMigrationKindAnIndependentRecoveryBudget() throws {
+        let since = Date(timeIntervalSince1970: 1_234_567)
+        let filters = NostrFilter.privateEnvelopeFiltersFor(
+            pubkey: "recipient",
+            since: since
+        )
+
+        #expect(filters.count == 2)
+        let objects = try filters.map { filter in
+            let data = try JSONEncoder().encode(filter)
+            return try #require(
+                try JSONSerialization.jsonObject(with: data) as? [String: Any]
+            )
+        }
+        #expect(objects.compactMap { $0["kinds"] as? [Int] } == [
+            [NostrProtocol.EventKind.privateEnvelope.rawValue],
+            [NostrProtocol.EventKind.legacyNIP59GiftWrap.rawValue]
+        ])
+        for object in objects {
+            #expect(object["#p"] as? [String] == ["recipient"])
+            #expect(object["since"] as? Int == 1_234_567)
+            #expect(object["limit"] as? Int ==
+                TransportConfig.nostrPrivateEnvelopeFetchLimitPerKind
+            )
+        }
+    }
+
     // MARK: - Helpers
     private static func validInboundEventDict() -> [String: Any] {
         [
@@ -349,6 +727,45 @@ struct NostrProtocolTests {
         ]
     }
 
+    private struct LegacyRecipientKeyFixture: Decodable {
+        let recipientPrivateKey: String
+
+        enum CodingKeys: String, CodingKey {
+            case recipientPrivateKey = "recipient_private_key"
+        }
+    }
+
+    private struct AndroidLegacyEnvelopeFixture: Decodable {
+        let androidCommit: String
+        let generator: String
+        let generatorPatch: String
+        let generatorPatchSHA256: String
+        let gradleTest: String
+        let fixtureSHA256: String
+        let recipientPrivateKey: String
+        let senderPublicKey: String
+
+        enum CodingKeys: String, CodingKey {
+            case androidCommit = "android_commit"
+            case generator
+            case generatorPatch = "generator_patch"
+            case generatorPatchSHA256 = "generator_patch_sha256"
+            case gradleTest = "gradle_test"
+            case fixtureSHA256 = "fixture_sha256"
+            case recipientPrivateKey = "recipient_private_key"
+            case senderPublicKey = "sender_public_key"
+        }
+    }
+
+    private func fixtureURL(name: String, extension fileExtension: String = "json") throws -> URL {
+        #if SWIFT_PACKAGE
+        let bundle = Bundle.module
+        #else
+        let bundle = Bundle(for: MockKeychain.self)
+        #endif
+        return try #require(bundle.url(forResource: name, withExtension: fileExtension))
+    }
+
     private static func base64URLDecode(_ s: String) -> Data? {
         var str = s.replacingOccurrences(of: "-", with: "+").replacingOccurrences(of: "_", with: "/")
         let rem = str.count % 4
@@ -366,4 +783,15 @@ struct NostrProtocolTests {
             Issue.record("Expected NostrError.invalidEvent, got \(error)")
         }
     }
+
+    private func expectInvalidCiphertext(_ operation: () throws -> Void) {
+        do {
+            try operation()
+            Issue.record("Expected NostrError.invalidCiphertext")
+        } catch NostrError.invalidCiphertext {
+            return
+        } catch {
+            Issue.record("Expected NostrError.invalidCiphertext, got \(error)")
+        }
+    }
 }

bitchatTests/Services/BLEFileTransferHandlerTests.swift

@@ -21,9 +21,12 @@ struct BLEFileTransferHandlerTests {
         var receiptCommits: [(messageID: String, storedURL: URL)] = []
         var receiptCommitSucceeds = true
         var removedIncomingFiles: [URL] = []
+        var finishedIncomingFileDeliveries: [URL] = []
         var lastSeenUpdates: [PeerID] = []
         var deliveryAcks: [(messageID: String, peerID: PeerID)] = []
         var deliveredMessages: [BitchatMessage] = []
+        var shouldAcceptDelivery = true
+        var deliveryOutcome = TransportEventDeliveryOutcome.accepted
         var saveOverride: ((
             _ data: Data,
             _ preferredName: String?,
@@ -34,12 +37,85 @@ struct BLEFileTransferHandlerTests {
         var receiptStateOverride: ((String) -> BLEPrivateMediaReceiptState)?
         var receiptCommitOverride: ((String, URL) -> Bool)?
         var removeIncomingFileOverride: ((URL) -> Void)?
+        var finishIncomingFileDeliveryOverride: ((URL) -> Void)?
     }
 
     private let localPeerID = PeerID(str: "0102030405060708")
     private let remotePeerID = PeerID(str: "1122334455667788")
     private let sampleSigningKey = Data(repeating: 0xAB, count: 32)
 
+    @Test @MainActor
+    func deliveryGateFinalizesInitialRejection() {
+        var completions = 0
+        var finalizations = 0
+
+        TransportEventDeliveryGate.attempt(
+            shouldDeliver: { false },
+            deliver: {
+                Issue.record("delivery sink must not run")
+                return .accepted
+            },
+            completion: { completions += 1 },
+            finalization: { _ in finalizations += 1 }
+        )
+
+        #expect(completions == 0)
+        #expect(finalizations == 1)
+    }
+
+    @Test @MainActor
+    func deliveryGateFinalizesMissingOrRejectingSink() {
+        var completions = 0
+        var finalizations = 0
+
+        TransportEventDeliveryGate.attempt(
+            shouldDeliver: { true },
+            deliver: { .rejected },
+            completion: { completions += 1 },
+            finalization: { _ in finalizations += 1 }
+        )
+
+        #expect(completions == 0)
+        #expect(finalizations == 1)
+    }
+
+    @Test @MainActor
+    func deliveryGateFinalizesPostInsertionRejection() {
+        var deliveryChecks = 0
+        var completions = 0
+        var finalizations = 0
+
+        TransportEventDeliveryGate.attempt(
+            shouldDeliver: {
+                deliveryChecks += 1
+                return deliveryChecks == 1
+            },
+            deliver: { .accepted },
+            completion: { completions += 1 },
+            finalization: { _ in finalizations += 1 }
+        )
+
+        #expect(deliveryChecks == 2)
+        #expect(completions == 0)
+        #expect(finalizations == 1)
+    }
+
+    @Test @MainActor
+    func deliveryGatePreservesInvokedUnconfirmedOutcomeWithoutAck() {
+        var completions = 0
+        var outcomes: [TransportEventDeliveryOutcome] = []
+
+        TransportEventDeliveryGate.attempt(
+            shouldDeliver: { true },
+            deliver: { .invokedUnconfirmed },
+            completion: { completions += 1 },
+            finalization: { outcomes.append($0) }
+        )
+
+        #expect(completions == 0)
+        #expect(outcomes == [.invokedUnconfirmed])
+    }
+
     private func makeHandler(recorder: Recorder) -> BLEFileTransferHandler {
         let environment = BLEFileTransferHandlerEnvironment(
             localPeerID: { [localPeerID] in localPeerID },
@@ -86,6 +162,10 @@ struct BLEFileTransferHandlerTests {
                 recorder.removedIncomingFiles.append(storedURL)
                 recorder.removeIncomingFileOverride?(storedURL)
             },
+            finishIncomingFileDelivery: { storedURL in
+                recorder.finishedIncomingFileDeliveries.append(storedURL)
+                recorder.finishIncomingFileDeliveryOverride?(storedURL)
+            },
             isPrivateMediaSenderBlocked: { peerID in
                 recorder.blockedPeers.contains(peerID)
             },
@@ -95,10 +175,18 @@ struct BLEFileTransferHandlerTests {
             acknowledgePrivateMedia: { messageID, peerID in
                 recorder.deliveryAcks.append((messageID, peerID))
             },
-            deliverMessage: { message, shouldDeliver, completion in
+            deliverMessage: { message, shouldDeliver, completion, finalization in
+                var outcome = TransportEventDeliveryOutcome.rejected
+                defer { finalization(outcome) }
+                guard recorder.shouldAcceptDelivery else { return }
                 guard shouldDeliver() else { return }
                 recorder.deliveredMessages.append(message)
                 guard shouldDeliver() else { return }
+                if recorder.deliveryOutcome == .invokedUnconfirmed {
+                    outcome = .invokedUnconfirmed
+                    return
+                }
+                outcome = .accepted
                 completion()
             }
         )
@@ -375,6 +463,73 @@ struct BLEFileTransferHandlerTests {
         #expect(recorder.deliveryAcks.first?.messageID == recorder.deliveredMessages.first?.id)
     }
 
+    @Test
+    func rejectedStableDeliveryReleasesPendingPayloadOwnership() throws {
+        let root = FileManager.default.temporaryDirectory.appendingPathComponent(
+            "private-media-handler-rejected-\(UUID().uuidString)",
+            isDirectory: true
+        )
+        defer { try? FileManager.default.removeItem(at: root) }
+        let store = BLEIncomingFileStore(baseDirectory: root)
+        let recorder = Recorder()
+        recorder.peers = [remotePeerID: makePeerInfo(
+            remotePeerID,
+            nickname: "Alice",
+            isVerified: true
+        )]
+        recorder.shouldAcceptDelivery = false
+        recorder.saveOverride = {
+            store.save(
+                data: $0,
+                preferredName: $1,
+                subdirectory: $2,
+                fallbackExtension: $3,
+                defaultPrefix: $4
+            )
+        }
+        recorder.receiptStateOverride = {
+            store.privateMediaReceiptState(messageID: $0)
+        }
+        recorder.receiptCommitOverride = {
+            store.commitPrivateMediaFile(messageID: $0, storedURL: $1)
+        }
+        recorder.removeIncomingFileOverride = {
+            store.removeIncomingFile(at: $0)
+        }
+        recorder.finishIncomingFileDeliveryOverride = {
+            store.finishIncomingFileDelivery(at: $0)
+        }
+
+        let content = Data([0xFF, 0xD8, 0xFF, 0xD9])
+        let fileName =
+            "img_20260725_105708_1CC2760D-76AA-40C3-8013-C7FAA6C2EF99.jpg"
+        let file = BitchatFilePacket(
+            fileName: fileName,
+            fileSize: UInt64(content.count),
+            mimeType: "image/jpeg",
+            content: content
+        )
+        let payload = try #require(file.encode())
+        let stableID = try #require(PrivateMediaMessageIdentity.stableID(
+            senderPeerID: remotePeerID,
+            recipientPeerID: localPeerID,
+            fileName: fileName
+        ))
+
+        #expect(makeHandler(recorder: recorder).handlePrivatePayload(
+            payload,
+            from: remotePeerID,
+            timestamp: Date(timeIntervalSince1970: 1_234)
+        ))
+        #expect(recorder.deliveredMessages.isEmpty)
+        #expect(recorder.deliveryAcks.isEmpty)
+        #expect(recorder.finishedIncomingFileDeliveries.count == 1)
+        #expect(store.reservePrivateMediaDeletion(
+            messageIDs: [stableID],
+            payloadRelativePaths: [:]
+        ) != nil)
+    }
+
     @Test
     func rawLegacyPrivateFileWithRetryShapedNameNeverUsesReceiptLedger() throws {
         let recorder = Recorder()
@@ -402,6 +557,64 @@ struct BLEFileTransferHandlerTests {
         #expect(recorder.deliveredMessages.first?.id.hasPrefix("media-") == false)
     }
 
+    @Test
+    func rejectedRawDeliveryRemovesUIUnownedPayload() throws {
+        let recorder = Recorder()
+        recorder.peers = [remotePeerID: makePeerInfo(
+            remotePeerID,
+            nickname: "Alice",
+            isVerified: true,
+            signingPublicKey: sampleSigningKey
+        )]
+        recorder.signatureVerifies = true
+        recorder.shouldAcceptDelivery = false
+        let handler = makeHandler(recorder: recorder)
+        let packet = try makeFileTransferPacket(
+            sender: remotePeerID,
+            mimeType: "image/jpeg",
+            content: Data([0xFF, 0xD8, 0xFF, 0xD9]),
+            recipientID: Data(hexString: localPeerID.id),
+            fileName: "raw-rejected.jpg"
+        )
+
+        #expect(handler.handle(packet, from: remotePeerID))
+        #expect(recorder.deliveredMessages.isEmpty)
+        #expect(recorder.removedIncomingFiles.count == 1)
+        #expect(recorder.removedIncomingFiles.first == recorder.saveResult)
+        #expect(recorder.finishedIncomingFileDeliveries.isEmpty)
+    }
+
+    @Test
+    func plainDelegateRawDeliveryPreservesPayloadWithoutSynchronousAck() throws {
+        let recorder = Recorder()
+        recorder.peers = [remotePeerID: makePeerInfo(
+            remotePeerID,
+            nickname: "Alice",
+            isVerified: true,
+            signingPublicKey: sampleSigningKey
+        )]
+        recorder.signatureVerifies = true
+        recorder.deliveryOutcome = .invokedUnconfirmed
+        let handler = makeHandler(recorder: recorder)
+        let packet = try makeFileTransferPacket(
+            sender: remotePeerID,
+            mimeType: "image/jpeg",
+            content: Data([0xFF, 0xD8, 0xFF, 0xD9]),
+            recipientID: Data(hexString: localPeerID.id),
+            fileName: "plain-delegate.jpg"
+        )
+
+        #expect(handler.handle(packet, from: remotePeerID))
+        #expect(recorder.deliveredMessages.count == 1)
+        #expect(recorder.deliveryAcks.isEmpty)
+        #expect(recorder.removedIncomingFiles.isEmpty)
+        #expect(recorder.finishedIncomingFileDeliveries.count == 1)
+        #expect(
+            recorder.finishedIncomingFileDeliveries.first
+                == recorder.saveResult
+        )
+    }
+
     @Test
     func repeatedLegacyPrivateImageNamesKeepDistinctRandomMessageIDs() throws {
         let recorder = Recorder()
@@ -502,12 +715,7 @@ struct BLEFileTransferHandlerTests {
                 nickname: "Alice",
                 isVerified: true
             )]
-            recorder.saveOverride = {
-                data,
-                preferredName,
-                subdirectory,
-                fallbackExtension,
-                defaultPrefix in
+            recorder.saveOverride = { data, preferredName, subdirectory, fallbackExtension, defaultPrefix in
                 store.save(
                     data: data,
                     preferredName: preferredName,
@@ -525,6 +733,9 @@ struct BLEFileTransferHandlerTests {
             recorder.removeIncomingFileOverride = {
                 store.removeIncomingFile(at: $0)
             }
+            recorder.finishIncomingFileDeliveryOverride = {
+                store.finishIncomingFileDelivery(at: $0)
+            }
         }
 
         let first = Recorder()
@@ -880,6 +1091,21 @@ struct BLEFileTransferHandlerTests {
         let messageID = "media-00112233445566778899aabbccddeeff"
 
         let seed = BLEPrivateMediaReceiptStore(baseDirectory: base)
+        let payload = base
+            .appendingPathComponent(
+                "files/images/incoming",
+                isDirectory: true
+            )
+            .appendingPathComponent("panic-receipt.jpg")
+        try FileManager.default.createDirectory(
+            at: payload.deletingLastPathComponent(),
+            withIntermediateDirectories: true
+        )
+        try Data("secret".utf8).write(to: payload, options: .atomic)
+        #expect(seed.commitAccepted(
+            messageID: messageID,
+            storedURL: payload
+        ))
         #expect(seed.recordDeleted(messageID: messageID))
 
         let store = BLEIncomingFileStore(baseDirectory: base)
@@ -896,6 +1122,52 @@ struct BLEFileTransferHandlerTests {
         )
     }
 
+    @Test
+    func panicWipeInvalidatesPayloadCoordinationReservations() throws {
+        let base = FileManager.default.temporaryDirectory
+            .appendingPathComponent(
+                "panic-payload-coordination-\(UUID().uuidString)",
+                isDirectory: true
+            )
+        defer { try? FileManager.default.removeItem(at: base) }
+        let store = BLEIncomingFileStore(baseDirectory: base)
+        let pendingName = "pending-before-panic.jpg"
+        let pendingURL = try #require(store.save(
+            data: Data("old".utf8),
+            preferredName: pendingName,
+            subdirectory: "images/incoming",
+            fallbackExtension: "jpg",
+            defaultPrefix: "image"
+        ))
+        let messageID = "media-aabbccddeeff00112233445566778899"
+        let reservation = try #require(store.reservePrivateMediaDeletion(
+            messageIDs: [messageID],
+            payloadRelativePaths: [
+                messageID: "images/incoming/delete-before-panic.jpg"
+            ]
+        ))
+
+        try store.panicWipe()
+
+        #expect(!store.commitPrivateMediaDeletion(
+            reservation: reservation,
+            messageIDs: [messageID],
+            payloadRelativePaths: [
+                messageID: "images/incoming/delete-before-panic.jpg"
+            ],
+            protectedPayloadRelativePaths: []
+        ))
+        let postPanicURL = try #require(store.save(
+            data: Data("new".utf8),
+            preferredName: pendingName,
+            subdirectory: "images/incoming",
+            fallbackExtension: "jpg",
+            defaultPrefix: "image"
+        ))
+        #expect(pendingURL.lastPathComponent == pendingName)
+        #expect(postPanicURL.lastPathComponent == pendingName)
+    }
+
     @Test
     func panicWipeAttemptsDeletionWhenMarkerPersistenceFails() throws {
         enum MarkerFailure: Error { case unavailable }

bitchatTests/Services/BLEPrivateMediaReceiptStoreTests.swift

@@ -4,8 +4,22 @@ import Testing
 
 struct BLEPrivateMediaReceiptStoreTests {
     private struct TestError: Error {}
+    private struct ReceiptFixture: Codable {
+        let kind: String
+        let relativePath: String?
+        let recordedAt: Date
+    }
+    private struct JournalEntryFixture: Codable {
+        let relativePaths: [String]
+        let recordedAt: Date
+    }
+    private struct JournalFixture: Codable {
+        let version: Int
+        let entries: [String: JournalEntryFixture]
+    }
 
     private let messageID = "media-00112233445566778899aabbccddeeff"
+    private let secondMessageID = "media-ffeeddccbbaa99887766554433221100"
 
     @Test
     func acceptedReceiptPersistsAcrossStoreInstances() throws {
@@ -21,6 +35,215 @@ struct BLEPrivateMediaReceiptStoreTests {
         #expect(relaunched.state(for: messageID) == .accepted(payload))
     }
 
+    @Test
+    func acceptedReceiptRejectsOutgoingPayloadAndCrossIDPathReuse() throws {
+        let root = makeRoot("accepted-ownership")
+        defer { try? FileManager.default.removeItem(at: root) }
+        let incoming = try makePayload(in: root)
+        let outgoingDirectory = root.appendingPathComponent(
+            "files/images/outgoing",
+            isDirectory: true
+        )
+        try FileManager.default.createDirectory(
+            at: outgoingDirectory,
+            withIntermediateDirectories: true
+        )
+        let outgoing = outgoingDirectory.appendingPathComponent("image.jpg")
+        try Data([0x01]).write(to: outgoing)
+        let store = BLEPrivateMediaReceiptStore(baseDirectory: root)
+
+        #expect(!store.commitAccepted(
+            messageID: messageID,
+            storedURL: outgoing
+        ))
+        #expect(store.commitAccepted(
+            messageID: messageID,
+            storedURL: incoming
+        ))
+        #expect(!store.commitAccepted(
+            messageID: secondMessageID,
+            storedURL: incoming
+        ))
+        #expect(FileManager.default.fileExists(atPath: incoming.path))
+        #expect(FileManager.default.fileExists(atPath: outgoing.path))
+    }
+
+    @Test
+    func liveAcceptedPathSurvivesTTLAndCapacityPressure() throws {
+        let root = makeRoot("accepted-retention")
+        defer { try? FileManager.default.removeItem(at: root) }
+        let firstPayload = try makePayload(in: root, name: "first.jpg")
+        let secondPayload = try makePayload(in: root, name: "second.jpg")
+        let recordedAt = Date(timeIntervalSince1970: 2_000)
+        let seed = BLEPrivateMediaReceiptStore(
+            baseDirectory: root,
+            capacity: 1,
+            ttl: 1,
+            now: { recordedAt }
+        )
+        #expect(seed.commitAccepted(
+            messageID: messageID,
+            storedURL: firstPayload
+        ))
+
+        let relaunched = BLEPrivateMediaReceiptStore(
+            baseDirectory: root,
+            capacity: 1,
+            ttl: 1,
+            now: { recordedAt.addingTimeInterval(2) }
+        )
+        #expect(relaunched.state(for: messageID) == .accepted(firstPayload))
+        #expect(!relaunched.commitAccepted(
+            messageID: secondMessageID,
+            storedURL: secondPayload
+        ))
+        #expect(relaunched.state(for: messageID) == .accepted(firstPayload))
+    }
+
+    @Test
+    func incomingAllocationDoesNotReuseReceiptOwnedMissingPath() throws {
+        let root = makeRoot("accepted-reservation")
+        defer { try? FileManager.default.removeItem(at: root) }
+        let original = try makePayload(in: root)
+        #expect(BLEPrivateMediaReceiptStore(
+            baseDirectory: root
+        ).commitAccepted(
+            messageID: messageID,
+            storedURL: original
+        ))
+        try FileManager.default.removeItem(at: original)
+
+        let stored = BLEIncomingFileStore(baseDirectory: root).save(
+            data: Data([0x03]),
+            preferredName: "image.jpg",
+            subdirectory: "images/incoming",
+            fallbackExtension: "jpg",
+            defaultPrefix: "image"
+        )
+
+        #expect(stored?.lastPathComponent != "image.jpg")
+        #expect(stored.map {
+            FileManager.default.fileExists(atPath: $0.path)
+        } == true)
+    }
+
+    @Test
+    func pendingRawArrivalBlocksDeletionFallbackPathReuse() throws {
+        let root = makeRoot("pending-raw-arrival")
+        defer { try? FileManager.default.removeItem(at: root) }
+        let incoming = BLEIncomingFileStore(baseDirectory: root)
+
+        // The old stable bubble names image.jpg, but its receipt and payload
+        // have already been pruned. A raw arrival saves that basename before
+        // its main-actor bubble is inserted.
+        let rawArrival = incoming.save(
+            data: Data([0x03]),
+            preferredName: "image.jpg",
+            subdirectory: "images/incoming",
+            fallbackExtension: "jpg",
+            defaultPrefix: "image"
+        )
+        #expect(rawArrival?.lastPathComponent == "image.jpg")
+
+        let reservation = incoming.reservePrivateMediaDeletion(
+            messageIDs: [messageID],
+            payloadRelativePaths: [
+                messageID: "images/incoming/image.jpg"
+            ]
+        )
+        #expect(reservation == nil)
+        #expect(rawArrival.map {
+            FileManager.default.fileExists(atPath: $0.path)
+        } == true)
+    }
+
+    @Test
+    func quotaDoesNotEvictOrReusePendingDeliveryPath() throws {
+        let root = makeRoot("pending-quota")
+        defer { try? FileManager.default.removeItem(at: root) }
+        let incoming = BLEIncomingFileStore(
+            baseDirectory: root,
+            quotaBytes: 1
+        )
+        let first = try #require(incoming.save(
+            data: Data([0x01, 0x02]),
+            preferredName: "image.jpg",
+            subdirectory: "images/incoming",
+            fallbackExtension: "jpg",
+            defaultPrefix: "image"
+        ))
+
+        incoming.enforceQuota(reservingBytes: 1)
+        #expect(FileManager.default.fileExists(atPath: first.path))
+
+        let second = try #require(incoming.save(
+            data: Data([0x03]),
+            preferredName: "image.jpg",
+            subdirectory: "images/incoming",
+            fallbackExtension: "jpg",
+            defaultPrefix: "image"
+        ))
+        #expect(second != first)
+        #expect(second.lastPathComponent == "image (1).jpg")
+        #expect(FileManager.default.fileExists(atPath: first.path))
+        #expect(FileManager.default.fileExists(atPath: second.path))
+    }
+
+    @Test
+    func invalidReceiptAndJournalCannotTargetOutgoingPayload() throws {
+        let root = makeRoot("invalid-owned-path")
+        defer { try? FileManager.default.removeItem(at: root) }
+        let outgoingDirectory = root.appendingPathComponent(
+            "files/images/outgoing",
+            isDirectory: true
+        )
+        try FileManager.default.createDirectory(
+            at: outgoingDirectory,
+            withIntermediateDirectories: true
+        )
+        let victim = outgoingDirectory.appendingPathComponent("victim.jpg")
+        try Data([0x02]).write(to: victim)
+        let receiptURL = receiptRecord(in: root)
+        try FileManager.default.createDirectory(
+            at: receiptURL.deletingLastPathComponent(),
+            withIntermediateDirectories: true
+        )
+        let fixture = ReceiptFixture(
+            kind: "tombstone",
+            relativePath: "images/outgoing/victim.jpg",
+            recordedAt: Date()
+        )
+        try JSONEncoder().encode(fixture).write(
+            to: receiptURL,
+            options: .atomic
+        )
+
+        #expect(
+            BLEPrivateMediaReceiptStore(baseDirectory: root)
+                .state(for: messageID) == .unavailable
+        )
+        #expect(FileManager.default.fileExists(atPath: victim.path))
+
+        try FileManager.default.removeItem(at: receiptURL)
+        let journal = JournalFixture(
+            version: 1,
+            entries: [messageID: JournalEntryFixture(
+                relativePaths: ["images/outgoing/victim.jpg"],
+                recordedAt: fixture.recordedAt
+            )]
+        )
+        try JSONEncoder().encode(journal).write(
+            to: deletionJournal(in: root),
+            options: .atomic
+        )
+
+        #expect(
+            BLEPrivateMediaReceiptStore(baseDirectory: root)
+                .state(for: messageID) == .unavailable
+        )
+        #expect(FileManager.default.fileExists(atPath: victim.path))
+    }
+
     @Test
     func directoryEnumerationFailureIsUnavailableAndRetriesWithoutCachingEmpty() throws {
         let root = makeRoot("list-failure")
@@ -128,25 +351,447 @@ struct BLEPrivateMediaReceiptStoreTests {
     }
 
     @Test
-    func failedTombstonePersistenceDoesNotPoisonVolatileState() throws {
-        let root = makeRoot("failed-tombstone-write")
+    func deletionBatchCommitsEveryIDBeforeRemovingPayloads() throws {
+        let root = makeRoot("batch")
+        defer { try? FileManager.default.removeItem(at: root) }
+        let firstPayload = try makePayload(in: root, name: "first.jpg")
+        let secondPayload = try makePayload(in: root, name: "second.jpg")
+        let store = BLEPrivateMediaReceiptStore(baseDirectory: root)
+        #expect(store.commitAccepted(
+            messageID: messageID,
+            storedURL: firstPayload
+        ))
+        #expect(store.commitAccepted(
+            messageID: secondMessageID,
+            storedURL: secondPayload
+        ))
+
+        #expect(store.recordDeleted(
+            messageIDs: [secondMessageID, messageID]
+        ))
+
+        #expect(store.state(for: messageID) == .tombstoned)
+        #expect(store.state(for: secondMessageID) == .tombstoned)
+        #expect(!FileManager.default.fileExists(atPath: firstPayload.path))
+        #expect(!FileManager.default.fileExists(atPath: secondPayload.path))
+        #expect(!FileManager.default.fileExists(
+            atPath: deletionJournal(in: root).path
+        ))
+    }
+
+    @Test
+    func failedJournalCommitPreservesAcceptedStateAndPayloads() throws {
+        let root = makeRoot("journal-failure")
+        defer { try? FileManager.default.removeItem(at: root) }
+        let firstPayload = try makePayload(in: root, name: "first.jpg")
+        let secondPayload = try makePayload(in: root, name: "second.jpg")
+        let seed = BLEPrivateMediaReceiptStore(baseDirectory: root)
+        #expect(seed.commitAccepted(
+            messageID: messageID,
+            storedURL: firstPayload
+        ))
+        #expect(seed.commitAccepted(
+            messageID: secondMessageID,
+            storedURL: secondPayload
+        ))
+
+        let failing = BLEPrivateMediaReceiptStore(
+            baseDirectory: root,
+            dataWriter: { _, _, _ in throw TestError() }
+        )
+        #expect(!failing.recordDeleted(
+            messageIDs: [messageID, secondMessageID]
+        ))
+
+        // A failed commit must not install a volatile tombstone. Otherwise a
+        // sender retry could be ACKed although the caller kept both bubbles.
+        #expect(failing.state(for: messageID) == .accepted(firstPayload))
+        #expect(
+            failing.state(for: secondMessageID) == .accepted(secondPayload)
+        )
+        #expect(FileManager.default.fileExists(atPath: firstPayload.path))
+        #expect(FileManager.default.fileExists(atPath: secondPayload.path))
+        #expect(!FileManager.default.fileExists(
+            atPath: deletionJournal(in: root).path
+        ))
+    }
+
+    @Test
+    func journalRecoversBatchAfterCrashDuringMaterialization() throws {
+        let root = makeRoot("crash-recovery")
+        defer { try? FileManager.default.removeItem(at: root) }
+        let firstPayload = try makePayload(in: root, name: "first.jpg")
+        let secondPayload = try makePayload(in: root, name: "second.jpg")
+        let seed = BLEPrivateMediaReceiptStore(baseDirectory: root)
+        #expect(seed.commitAccepted(
+            messageID: messageID,
+            storedURL: firstPayload
+        ))
+        #expect(seed.commitAccepted(
+            messageID: secondMessageID,
+            storedURL: secondPayload
+        ))
+
+        let interrupted = BLEPrivateMediaReceiptStore(
+            baseDirectory: root,
+            dataWriter: { data, url, options in
+                let isJournal =
+                    url.lastPathComponent == ".deletion-journal.json"
+                let isFirstRecord =
+                    url.deletingPathExtension().lastPathComponent == messageID
+                guard isJournal || isFirstRecord else {
+                    throw TestError()
+                }
+                try data.write(to: url, options: options)
+            }
+        )
+        #expect(interrupted.recordDeleted(
+            messageIDs: [messageID, secondMessageID]
+        ))
+        #expect(FileManager.default.fileExists(
+            atPath: deletionJournal(in: root).path
+        ))
+        #expect(!FileManager.default.fileExists(atPath: firstPayload.path))
+        #expect(FileManager.default.fileExists(atPath: secondPayload.path))
+        #expect(interrupted.state(for: messageID) == .tombstoned)
+        #expect(interrupted.state(for: secondMessageID) == .tombstoned)
+
+        let relaunched = BLEPrivateMediaReceiptStore(baseDirectory: root)
+        #expect(relaunched.state(for: messageID) == .tombstoned)
+        #expect(relaunched.state(for: secondMessageID) == .tombstoned)
+        #expect(!FileManager.default.fileExists(atPath: firstPayload.path))
+        #expect(!FileManager.default.fileExists(atPath: secondPayload.path))
+        #expect(!FileManager.default.fileExists(
+            atPath: deletionJournal(in: root).path
+        ))
+    }
+
+    @Test
+    func journalRetriesPayloadUnlinkAfterRelaunch() throws {
+        let root = makeRoot("unlink-recovery")
+        defer { try? FileManager.default.removeItem(at: root) }
+        let payload = try makePayload(in: root)
+        let seed = BLEPrivateMediaReceiptStore(baseDirectory: root)
+        #expect(seed.commitAccepted(
+            messageID: messageID,
+            storedURL: payload
+        ))
+
+        let unlinkFailure = BLEPrivateMediaReceiptStore(
+            baseDirectory: root,
+            payloadRemover: { _ in throw TestError() }
+        )
+        #expect(unlinkFailure.recordDeleted(messageID: messageID))
+        #expect(unlinkFailure.state(for: messageID) == .tombstoned)
+        #expect(FileManager.default.fileExists(atPath: payload.path))
+        #expect(FileManager.default.fileExists(
+            atPath: deletionJournal(in: root).path
+        ))
+
+        let relaunched = BLEPrivateMediaReceiptStore(baseDirectory: root)
+        #expect(relaunched.state(for: messageID) == .tombstoned)
+        #expect(!FileManager.default.fileExists(atPath: payload.path))
+        #expect(!FileManager.default.fileExists(
+            atPath: deletionJournal(in: root).path
+        ))
+    }
+
+    @Test
+    func expiredReceiptUsesFallbackPathForCrashSafeCleanup() throws {
+        let root = makeRoot("expired-fallback")
+        defer { try? FileManager.default.removeItem(at: root) }
+        let payload = try makePayload(in: root)
+        let recordedAt = Date(timeIntervalSince1970: 1_000)
+        let seed = BLEPrivateMediaReceiptStore(
+            baseDirectory: root,
+            ttl: 10,
+            now: { recordedAt }
+        )
+        #expect(seed.commitAccepted(
+            messageID: messageID,
+            storedURL: payload
+        ))
+        // Simulate a receipt pruned by an older app version while its bubble
+        // and payload remain. Current code retains live accepted-path owners.
+        try FileManager.default.removeItem(at: receiptRecord(in: root))
+
+        let afterExpiry = recordedAt.addingTimeInterval(11)
+        let interrupted = BLEPrivateMediaReceiptStore(
+            baseDirectory: root,
+            ttl: 10,
+            now: { afterExpiry },
+            payloadRemover: { _ in throw TestError() }
+        )
+        #expect(interrupted.recordDeleted(
+            messageIDs: [messageID],
+            payloadRelativePaths: [
+                messageID: "images/incoming/image.jpg"
+            ]
+        ))
+        #expect(interrupted.state(for: messageID) == .tombstoned)
+        #expect(FileManager.default.fileExists(atPath: payload.path))
+        #expect(FileManager.default.fileExists(
+            atPath: deletionJournal(in: root).path
+        ))
+
+        let relaunched = BLEPrivateMediaReceiptStore(
+            baseDirectory: root,
+            ttl: 10,
+            now: { afterExpiry }
+        )
+        #expect(relaunched.state(for: messageID) == .tombstoned)
+        #expect(!FileManager.default.fileExists(atPath: payload.path))
+        #expect(!FileManager.default.fileExists(
+            atPath: deletionJournal(in: root).path
+        ))
+    }
+
+    @Test
+    func retryAtSuffixedPathDeletesReceiptAndBubblePayloads() throws {
+        let root = makeRoot("retry-suffix")
+        defer { try? FileManager.default.removeItem(at: root) }
+        let original = try makePayload(in: root)
+        let seed = BLEPrivateMediaReceiptStore(baseDirectory: root)
+        #expect(seed.commitAccepted(
+            messageID: messageID,
+            storedURL: original
+        ))
+
+        // Simulate an older build pruning only the receipt. A retry must use a
+        // suffixed filename while the old bubble still references image.jpg.
+        try FileManager.default.removeItem(at: receiptRecord(in: root))
+        let retry = try makePayload(in: root, name: "image (1).jpg")
+        let retried = BLEPrivateMediaReceiptStore(baseDirectory: root)
+        #expect(retried.commitAccepted(
+            messageID: messageID,
+            storedURL: retry
+        ))
+
+        #expect(retried.recordDeleted(
+            messageIDs: [messageID],
+            payloadRelativePaths: [
+                messageID: "images/incoming/image.jpg"
+            ]
+        ))
+        #expect(retried.state(for: messageID) == .tombstoned)
+        #expect(!FileManager.default.fileExists(atPath: original.path))
+        #expect(!FileManager.default.fileExists(atPath: retry.path))
+        #expect(!FileManager.default.fileExists(
+            atPath: deletionJournal(in: root).path
+        ))
+
+        let relaunched = BLEPrivateMediaReceiptStore(baseDirectory: root)
+        #expect(relaunched.state(for: messageID) == .tombstoned)
+        #expect(!FileManager.default.fileExists(atPath: original.path))
+        #expect(!FileManager.default.fileExists(atPath: retry.path))
+    }
+
+    @Test
+    func protectedUIPathRejectsAcceptedReceiptDeletion() throws {
+        let root = makeRoot("protected-ui-owner")
+        defer { try? FileManager.default.removeItem(at: root) }
+        let payload = try makePayload(in: root)
+        let store = BLEPrivateMediaReceiptStore(baseDirectory: root)
+        #expect(store.commitAccepted(
+            messageID: messageID,
+            storedURL: payload
+        ))
+
+        #expect(!store.recordDeleted(
+            messageIDs: [messageID],
+            protectedPayloadRelativePaths: [
+                "images/incoming/image.jpg"
+            ]
+        ))
+        #expect(store.state(for: messageID) == .accepted(payload))
+        #expect(FileManager.default.fileExists(atPath: payload.path))
+    }
+
+    @Test
+    func pathlessNewDeletionFailsWithoutChangingReceiverState() {
+        let root = makeRoot("pathless-delete")
         defer { try? FileManager.default.removeItem(at: root) }
         let store = BLEPrivateMediaReceiptStore(baseDirectory: root)
-        #expect(store.state(for: messageID) == .absent)
 
-        // Force the atomic record write itself to fail after the store has
-        // successfully loaded its empty index.
-        let record = receiptRecord(in: root)
+        #expect(!store.recordDeleted(messageID: messageID))
+        #expect(store.state(for: messageID) == .absent)
+        #expect(!FileManager.default.fileExists(
+            atPath: deletionJournal(in: root).path
+        ))
+    }
+
+    @Test
+    func completedTombstoneNeverDeletesReusedPayloadPath() throws {
+        let root = makeRoot("path-reuse")
+        defer { try? FileManager.default.removeItem(at: root) }
+        let original = try makePayload(in: root)
+        let store = BLEPrivateMediaReceiptStore(baseDirectory: root)
+        #expect(store.commitAccepted(
+            messageID: messageID,
+            storedURL: original
+        ))
+        #expect(store.recordDeleted(messageID: messageID))
+        #expect(!FileManager.default.fileExists(atPath: original.path))
+
+        let reused = try makePayload(in: root)
+        #expect(store.commitAccepted(
+            messageID: secondMessageID,
+            storedURL: reused
+        ))
+        #expect(store.state(for: messageID) == .tombstoned)
+        #expect(FileManager.default.fileExists(atPath: reused.path))
+
+        let relaunched = BLEPrivateMediaReceiptStore(baseDirectory: root)
+        #expect(relaunched.state(for: messageID) == .tombstoned)
+        #expect(FileManager.default.fileExists(atPath: reused.path))
+        #expect(
+            relaunched.state(for: secondMessageID) == .accepted(reused)
+        )
+    }
+
+    @Test
+    func expiredLegacyPathfulTombstoneDoesNotDeleteAcceptedOwner() throws {
+        let root = makeRoot("legacy-path-conflict")
+        defer { try? FileManager.default.removeItem(at: root) }
+        let payload = try makePayload(in: root)
+        let receiptDirectory = receiptRecord(in: root)
+            .deletingLastPathComponent()
         try FileManager.default.createDirectory(
-            at: record,
+            at: receiptDirectory,
             withIntermediateDirectories: true
         )
-        #expect(!store.recordDeleted(messageID: messageID))
-        try FileManager.default.removeItem(at: record)
+        let recordedAt = Date(timeIntervalSince1970: 3_000)
+        try JSONEncoder().encode(ReceiptFixture(
+            kind: "tombstone",
+            relativePath: "images/incoming/image.jpg",
+            recordedAt: recordedAt
+        )).write(
+            to: receiptRecord(in: root),
+            options: .atomic
+        )
+        try JSONEncoder().encode(ReceiptFixture(
+            kind: "accepted",
+            relativePath: "images/incoming/image.jpg",
+            recordedAt: recordedAt
+        )).write(
+            to: receiptRecord(
+                in: root,
+                messageID: secondMessageID
+            ),
+            options: .atomic
+        )
 
-        // The UI must be able to report the deletion failure without a
-        // process-lifetime tombstone silently hiding a later retry.
+        let store = BLEPrivateMediaReceiptStore(
+            baseDirectory: root,
+            ttl: 1,
+            now: { recordedAt.addingTimeInterval(2) }
+        )
         #expect(store.state(for: messageID) == .absent)
+        #expect(FileManager.default.fileExists(atPath: payload.path))
+        #expect(
+            store.state(for: secondMessageID) == .accepted(payload)
+        )
+        #expect(FileManager.default.fileExists(atPath: payload.path))
+    }
+
+    @Test
+    func expiredLegacyPathfulTombstonePreservesAmbiguousPayload() throws {
+        let root = makeRoot("legacy-expired-cleanup")
+        defer { try? FileManager.default.removeItem(at: root) }
+        let payload = try makePayload(in: root)
+        let receiptURL = receiptRecord(in: root)
+        try FileManager.default.createDirectory(
+            at: receiptURL.deletingLastPathComponent(),
+            withIntermediateDirectories: true
+        )
+        let recordedAt = Date(timeIntervalSince1970: 3_000)
+        try JSONEncoder().encode(ReceiptFixture(
+            kind: "tombstone",
+            relativePath: "images/incoming/image.jpg",
+            recordedAt: recordedAt
+        )).write(to: receiptURL, options: .atomic)
+
+        let store = BLEPrivateMediaReceiptStore(
+            baseDirectory: root,
+            ttl: 1,
+            now: { recordedAt.addingTimeInterval(2) }
+        )
+
+        #expect(store.state(for: messageID) == .absent)
+        #expect(FileManager.default.fileExists(atPath: payload.path))
+        #expect(!FileManager.default.fileExists(atPath: receiptURL.path))
+    }
+
+    @Test
+    func deletionJournalNeverRecursivelyRemovesDirectoryTarget() throws {
+        let root = makeRoot("journal-directory")
+        defer { try? FileManager.default.removeItem(at: root) }
+        let directory = root.appendingPathComponent(
+            "files/images/incoming/archive",
+            isDirectory: true
+        )
+        try FileManager.default.createDirectory(
+            at: directory,
+            withIntermediateDirectories: true
+        )
+        let child = directory.appendingPathComponent("child.jpg")
+        try Data([0x01]).write(to: child)
+        let receiptDirectory = receiptRecord(in: root)
+            .deletingLastPathComponent()
+        try FileManager.default.createDirectory(
+            at: receiptDirectory,
+            withIntermediateDirectories: true
+        )
+        #expect(!BLEPrivateMediaReceiptStore(
+            baseDirectory: root
+        ).recordDeleted(
+            messageIDs: [messageID],
+            payloadRelativePaths: [
+                messageID: "images/incoming/archive"
+            ]
+        ))
+        #expect(!FileManager.default.fileExists(
+            atPath: deletionJournal(in: root).path
+        ))
+        try JSONEncoder().encode(JournalFixture(
+            version: 1,
+            entries: [messageID: JournalEntryFixture(
+                relativePaths: ["images/incoming/archive"],
+                recordedAt: Date()
+            )]
+        )).write(to: deletionJournal(in: root), options: .atomic)
+
+        let store = BLEPrivateMediaReceiptStore(baseDirectory: root)
+        #expect(store.state(for: messageID) == .tombstoned)
+        #expect(FileManager.default.fileExists(atPath: directory.path))
+        #expect(FileManager.default.fileExists(atPath: child.path))
+        #expect(FileManager.default.fileExists(
+            atPath: deletionJournal(in: root).path
+        ))
+    }
+
+    @Test
+    func corruptDeletionJournalFailsClosedWithoutRemovingPayload() throws {
+        let root = makeRoot("corrupt-journal")
+        defer { try? FileManager.default.removeItem(at: root) }
+        let payload = try makePayload(in: root)
+        #expect(BLEPrivateMediaReceiptStore(
+            baseDirectory: root
+        ).commitAccepted(
+            messageID: messageID,
+            storedURL: payload
+        ))
+        let journal = deletionJournal(in: root)
+        try Data("{not-json".utf8).write(to: journal, options: .atomic)
+
+        let relaunched = BLEPrivateMediaReceiptStore(baseDirectory: root)
+        #expect(relaunched.state(for: messageID) == .unavailable)
+        #expect(!relaunched.commitAccepted(
+            messageID: messageID,
+            storedURL: payload
+        ))
+        #expect(FileManager.default.fileExists(atPath: payload.path))
+        #expect(try Data(contentsOf: journal) == Data("{not-json".utf8))
     }
 
     @Test
@@ -180,7 +825,10 @@ struct BLEPrivateMediaReceiptStoreTests {
         )
     }
 
-    private func makePayload(in root: URL) throws -> URL {
+    private func makePayload(
+        in root: URL,
+        name: String = "image.jpg"
+    ) throws -> URL {
         let directory = root.appendingPathComponent(
             "files/images/incoming",
             isDirectory: true
@@ -189,18 +837,30 @@ struct BLEPrivateMediaReceiptStoreTests {
             at: directory,
             withIntermediateDirectories: true
         )
-        let payload = directory.appendingPathComponent("image.jpg")
+        let payload = directory.appendingPathComponent(name)
         try Data([0xFF, 0xD8, 0xFF, 0xD9]).write(to: payload)
         return payload
     }
 
-    private func receiptRecord(in root: URL) -> URL {
+    private func receiptRecord(
+        in root: URL,
+        messageID requestedMessageID: String? = nil
+    ) -> URL {
         root
             .appendingPathComponent(
                 "files/.private-media-receipts",
                 isDirectory: true
             )
-            .appendingPathComponent(messageID)
+            .appendingPathComponent(requestedMessageID ?? messageID)
             .appendingPathExtension("json")
     }
+
+    private func deletionJournal(in root: URL) -> URL {
+        root
+            .appendingPathComponent(
+                "files/.private-media-receipts",
+                isDirectory: true
+            )
+            .appendingPathComponent(".deletion-journal.json")
+    }
 }

bitchatTests/Services/NostrRelayManagerTests.swift

@@ -267,6 +267,588 @@ final class NostrRelayManagerTests: XCTestCase {
         XCTAssertEqual(context.manager.debugPendingMessageQueueCount, TransportConfig.nostrPendingSendQueueCap)
     }
 
+    func test_privateEnvelopeBatchEvictsEphemeralTrafficAndRemainsAtomic() async throws {
+        let relayURL = "wss://private-batch-priority.example"
+        let context = makeContext(
+            permission: .denied,
+            userTorEnabled: true,
+            torEnforced: true,
+            torIsReady: false
+        )
+        var ephemeralIDs: [String] = []
+        for i in 0..<(TransportConfig.nostrPendingSendQueueCap - 1) {
+            let event = try makeSignedEvent(
+                content: "ephemeral-\(i)",
+                kind: .ephemeralEvent
+            )
+            ephemeralIDs.append(event.id)
+            context.manager.sendEvent(event, to: [relayURL])
+        }
+        let regular = try makeSignedEvent(content: "regular survives")
+        context.manager.sendEvent(regular, to: [relayURL])
+        XCTAssertEqual(
+            context.manager.debugPendingMessageQueueCount,
+            TransportConfig.nostrPendingSendQueueCap
+        )
+
+        let primary = try makeSignedEvent(content: "primary", kind: .privateEnvelope)
+        let legacy = try makeSignedEvent(content: "legacy", kind: .legacyNIP59GiftWrap)
+        XCTAssertTrue(context.manager.sendPrivateEnvelopeBatch([primary, legacy], to: [relayURL]))
+
+        let batches = context.manager.debugPendingMessageQueueEventIDsByBatch
+        let allIDs = Set(batches.flatMap { $0 })
+        XCTAssertEqual(
+            context.manager.debugPendingMessageQueueCount,
+            TransportConfig.nostrPendingSendQueueCap
+        )
+        XCTAssertTrue(batches.contains([primary.id, legacy.id]))
+        XCTAssertTrue(allIDs.contains(regular.id))
+        XCTAssertFalse(allIDs.contains(ephemeralIDs[0]))
+        XCTAssertFalse(allIDs.contains(ephemeralIDs[1]))
+
+        // Later low-priority traffic may evict another ephemeral event, but
+        // never one half (or both halves) of the protected private batch.
+        let lateEphemeral = try makeSignedEvent(content: "late", kind: .geohashPresence)
+        context.manager.sendEvent(lateEphemeral, to: [relayURL])
+        XCTAssertTrue(
+            context.manager.debugPendingMessageQueueEventIDsByBatch
+                .contains([primary.id, legacy.id])
+        )
+    }
+
+    func test_privateEnvelopeBatchDoesNotWriteStaleSocketUntilTorRecovers() async throws {
+        let relayURL = "wss://private-batch-tor-gate.example"
+        let context = makeContext(
+            permission: .denied,
+            userTorEnabled: true,
+            torEnforced: true,
+            torIsReady: true
+        )
+        context.manager.ensureConnections(to: [relayURL])
+        let connected = await waitUntil {
+            context.manager.relays.first(where: { $0.url == relayURL })?.isConnected == true
+        }
+        XCTAssertTrue(connected)
+        let connection = try XCTUnwrap(context.sessionFactory.latestConnection(for: relayURL))
+
+        context.torWaiter.isReady = false
+        let primary = try makeSignedEvent(content: "primary", kind: .privateEnvelope)
+        let legacy = try makeSignedEvent(content: "legacy", kind: .legacyNIP59GiftWrap)
+        XCTAssertTrue(context.manager.sendPrivateEnvelopeBatch([primary, legacy], to: [relayURL]))
+
+        try? await Task.sleep(nanoseconds: 20_000_000)
+        XCTAssertTrue(connection.sentStrings.isEmpty)
+        XCTAssertEqual(context.manager.debugPendingMessageQueueCount, 2)
+        XCTAssertEqual(context.torWaiter.awaitCallCount, 1)
+
+        context.torWaiter.resolve(true)
+        let flushed = await waitUntil {
+            connection.sentStrings.count == 2
+        }
+        XCTAssertTrue(flushed)
+        XCTAssertEqual(context.manager.debugPendingMessageQueueCount, 2)
+        try await emitAcceptedPair([primary, legacy], on: connection)
+        let acknowledged = await waitUntil {
+            context.manager.debugPendingMessageQueueCount == 0
+        }
+        XCTAssertTrue(acknowledged)
+    }
+
+    func test_privateEnvelopeBatchPrunesTerminalRelayAfterHealthyDelivery() async throws {
+        let healthyURL = "wss://private-batch-healthy.example"
+        let deadURL = "wss://private-batch-dead.example"
+        let context = makeContext(permission: .denied)
+        context.sessionFactory.pingErrorByURL[deadURL] = NSError(
+            domain: NSURLErrorDomain,
+            code: NSURLErrorCannotFindHost
+        )
+        let primary = try makeSignedEvent(content: "primary", kind: .privateEnvelope)
+        let legacy = try makeSignedEvent(content: "legacy", kind: .legacyNIP59GiftWrap)
+        var terminalFailureCount = 0
+
+        XCTAssertTrue(context.manager.sendPrivateEnvelopeBatch(
+            [primary, legacy],
+            to: [healthyURL, deadURL],
+            terminalFailure: { terminalFailureCount += 1 }
+        ))
+
+        let healthyConnection = try XCTUnwrap(
+            context.sessionFactory.latestConnection(for: healthyURL)
+        )
+        let written = await waitUntil {
+            healthyConnection.sentStrings.count == 2
+        }
+        XCTAssertTrue(written)
+        XCTAssertEqual(context.manager.debugPendingMessageQueueCount, 2)
+        try await emitAcceptedPair([primary, legacy], on: healthyConnection)
+        let initiallyAcknowledged = await waitUntil {
+            context.manager.debugPendingMessageQueueCount == 0
+        }
+        XCTAssertTrue(initiallyAcknowledged)
+        XCTAssertEqual(terminalFailureCount, 0)
+
+        // The terminal target is excluded during cooldown. More than one full
+        // protected-capacity worth of subsequent logical sends must continue
+        // to drain through the healthy relay instead of wedging globally.
+        for _ in 0...100 {
+            let sentCountBefore = healthyConnection.sentStrings.count
+            XCTAssertTrue(context.manager.sendPrivateEnvelopeBatch(
+                [primary, legacy],
+                to: [healthyURL, deadURL]
+            ))
+            let written = await waitUntil {
+                healthyConnection.sentStrings.count == sentCountBefore + 2
+            }
+            XCTAssertTrue(written)
+            try await emitAcceptedPair([primary, legacy], on: healthyConnection)
+            let acknowledged = await waitUntil {
+                context.manager.debugPendingMessageQueueCount == 0
+            }
+            XCTAssertTrue(acknowledged)
+        }
+    }
+
+    func test_privateEnvelopeBatchAllTerminalTargetsReportsWholeBatchFailure() async throws {
+        let deadURL = "wss://private-batch-all-dead.example"
+        let context = makeContext(permission: .denied)
+        context.sessionFactory.pingErrorByURL[deadURL] = NSError(
+            domain: NSURLErrorDomain,
+            code: NSURLErrorCannotFindHost
+        )
+        let primary = try makeSignedEvent(content: "primary", kind: .privateEnvelope)
+        let legacy = try makeSignedEvent(content: "legacy", kind: .legacyNIP59GiftWrap)
+        var terminalFailureCount = 0
+
+        XCTAssertTrue(context.manager.sendPrivateEnvelopeBatch(
+            [primary, legacy],
+            to: [deadURL],
+            terminalFailure: { terminalFailureCount += 1 }
+        ))
+
+        let failed = await waitUntil {
+            terminalFailureCount == 1 &&
+                context.manager.debugPendingMessageQueueCount == 0
+        }
+        XCTAssertTrue(failed)
+    }
+
+    func test_privateEnvelopeBatchRejectsBeforeWritingWhenProtectedCapacityIsFull() async throws {
+        let stalledRelayURL = "wss://private-batch-full.example"
+        let connectedRelayURL = "wss://private-batch-connected.example"
+        let context = makeContext(
+            permission: .denied,
+            userTorEnabled: true,
+            torEnforced: true,
+            torIsReady: true,
+            torIsForeground: true
+        )
+        context.manager.ensureConnections(to: [connectedRelayURL])
+        let connected = await waitUntil {
+            context.manager.relays.first(where: { $0.url == connectedRelayURL })?.isConnected == true
+        }
+        XCTAssertTrue(connected)
+        context.torForeground.value = false
+
+        let primary = try makeSignedEvent(content: "primary", kind: .privateEnvelope)
+        let legacy = try makeSignedEvent(content: "legacy", kind: .legacyNIP59GiftWrap)
+        let pair = [primary, legacy]
+
+        for _ in 0..<(TransportConfig.nostrPendingSendQueueCap / pair.count) {
+            XCTAssertTrue(context.manager.sendPrivateEnvelopeBatch(pair, to: [stalledRelayURL]))
+        }
+        XCTAssertEqual(
+            context.manager.debugPendingMessageQueueCount,
+            TransportConfig.nostrPendingSendQueueCap
+        )
+
+        let rejectedPrimary = try makeSignedEvent(content: "rejected-primary", kind: .privateEnvelope)
+        let rejectedLegacy = try makeSignedEvent(content: "rejected-legacy", kind: .legacyNIP59GiftWrap)
+        XCTAssertFalse(
+            context.manager.sendPrivateEnvelopeBatch(
+                [rejectedPrimary, rejectedLegacy],
+                to: [connectedRelayURL]
+            )
+        )
+        try? await Task.sleep(nanoseconds: 20_000_000)
+        XCTAssertTrue(
+            context.sessionFactory.latestConnection(for: connectedRelayURL)?.sentStrings.isEmpty == true
+        )
+        let queuedIDs = Set(
+            context.manager.debugPendingMessageQueueEventIDsByBatch.flatMap { $0 }
+        )
+        XCTAssertFalse(queuedIDs.contains(rejectedPrimary.id))
+        XCTAssertFalse(queuedIDs.contains(rejectedLegacy.id))
+    }
+
+    func test_privateEnvelopeBatchStaysQueuedAndRetriesAfterFirstWriteFails() async throws {
+        try await assertPrivateEnvelopeBatchWriteFailure(
+            failureSequence: [NSError(domain: "send", code: 1)],
+            expectedFirstConnectionWrites: 1
+        )
+    }
+
+    func test_privateEnvelopeBatchStaysQueuedAndRetriesAfterSecondWriteFails() async throws {
+        try await assertPrivateEnvelopeBatchWriteFailure(
+            failureSequence: [nil, NSError(domain: "send", code: 2)],
+            expectedFirstConnectionWrites: 2
+        )
+    }
+
+    func test_privateEnvelopeBatchRemainsPendingUntilBothRelayOKsArrive() async throws {
+        let relayURL = "wss://private-batch-two-write-commit.example"
+        let context = makeContext(permission: .denied)
+        let primary = try makeSignedEvent(content: "primary", kind: .privateEnvelope)
+        let legacy = try makeSignedEvent(content: "legacy", kind: .legacyNIP59GiftWrap)
+
+        XCTAssertTrue(context.manager.sendPrivateEnvelopeBatch([primary, legacy], to: [relayURL]))
+        let connection = try XCTUnwrap(context.sessionFactory.latestConnection(for: relayURL))
+        connection.deferSendCompletions = true
+
+        let firstWriteStarted = await waitUntil { connection.sentStrings.count == 1 }
+        XCTAssertTrue(firstWriteStarted)
+        XCTAssertEqual(context.manager.debugPendingMessageQueueCount, 2)
+
+        connection.flushDeferredSendCompletions()
+        let secondWriteStarted = await waitUntil { connection.sentStrings.count == 2 }
+        XCTAssertTrue(secondWriteStarted)
+        XCTAssertEqual(context.manager.debugPendingMessageQueueCount, 2)
+
+        connection.flushDeferredSendCompletions()
+        try? await Task.sleep(nanoseconds: 20_000_000)
+        XCTAssertEqual(context.manager.debugPendingMessageQueueCount, 2)
+
+        try connection.emitOK(eventID: primary.id, success: true, reason: "accepted")
+        try? await Task.sleep(nanoseconds: 20_000_000)
+        XCTAssertEqual(context.manager.debugPendingMessageQueueCount, 2)
+
+        try connection.emitOK(eventID: legacy.id, success: true, reason: "accepted")
+        let committed = await waitUntil {
+            context.manager.debugPendingMessageQueueCount == 0
+        }
+        XCTAssertTrue(committed)
+    }
+
+    func test_privateEnvelopeBatchRejectedHalfReportsWholeBatchFailure() async throws {
+        let relayURL = "wss://private-batch-rejected-half.example"
+        let context = makeContext(permission: .denied)
+        let primary = try makeSignedEvent(content: "primary", kind: .privateEnvelope)
+        let legacy = try makeSignedEvent(content: "legacy", kind: .legacyNIP59GiftWrap)
+        var terminalFailureCount = 0
+
+        XCTAssertTrue(context.manager.sendPrivateEnvelopeBatch(
+            [primary, legacy],
+            to: [relayURL],
+            terminalFailure: { terminalFailureCount += 1 }
+        ))
+        let connection = try XCTUnwrap(
+            context.sessionFactory.latestConnection(for: relayURL)
+        )
+        let written = await waitUntil { connection.sentStrings.count == 2 }
+        XCTAssertTrue(written)
+        XCTAssertEqual(context.manager.debugPendingMessageQueueCount, 2)
+
+        try connection.emitOK(eventID: primary.id, success: true, reason: "accepted")
+        try? await Task.sleep(nanoseconds: 20_000_000)
+        XCTAssertEqual(context.manager.debugPendingMessageQueueCount, 2)
+        XCTAssertEqual(terminalFailureCount, 0)
+
+        try connection.emitOK(eventID: legacy.id, success: false, reason: "blocked: policy")
+        let failed = await waitUntil {
+            context.manager.debugPendingMessageQueueCount == 0 &&
+                terminalFailureCount == 1
+        }
+        XCTAssertTrue(failed)
+    }
+
+    func test_privateEnvelopeBatchDuplicateOKsCountAsDurableAcceptance() async throws {
+        let relayURL = "wss://private-batch-duplicate.example"
+        let context = makeContext(permission: .denied)
+        let primary = try makeSignedEvent(content: "primary", kind: .privateEnvelope)
+        let legacy = try makeSignedEvent(content: "legacy", kind: .legacyNIP59GiftWrap)
+        var terminalFailureCount = 0
+
+        XCTAssertTrue(context.manager.sendPrivateEnvelopeBatch(
+            [primary, legacy],
+            to: [relayURL],
+            terminalFailure: { terminalFailureCount += 1 }
+        ))
+        let connection = try XCTUnwrap(
+            context.sessionFactory.latestConnection(for: relayURL)
+        )
+        let written = await waitUntil { connection.sentStrings.count == 2 }
+        XCTAssertTrue(written)
+
+        for event in [primary, legacy] {
+            try connection.emitOK(
+                eventID: event.id,
+                success: false,
+                reason: "  DuPlIcAtE: already have this event"
+            )
+            try? await Task.sleep(nanoseconds: 20_000_000)
+        }
+        let acknowledged = await waitUntil {
+            context.manager.debugPendingMessageQueueCount == 0
+        }
+        XCTAssertTrue(acknowledged)
+        XCTAssertEqual(terminalFailureCount, 0)
+    }
+
+    func test_privateEnvelopeBatchAcknowledgementTimeoutReportsWholeBatchFailure() async throws {
+        let relayURL = "wss://private-batch-ok-timeout.example"
+        let context = makeContext(permission: .denied)
+        let primary = try makeSignedEvent(content: "primary", kind: .privateEnvelope)
+        let legacy = try makeSignedEvent(content: "legacy", kind: .legacyNIP59GiftWrap)
+        var terminalFailureCount = 0
+
+        XCTAssertTrue(context.manager.sendPrivateEnvelopeBatch(
+            [primary, legacy],
+            to: [relayURL],
+            terminalFailure: { terminalFailureCount += 1 }
+        ))
+        let connection = try XCTUnwrap(
+            context.sessionFactory.latestConnection(for: relayURL)
+        )
+        let timeoutScheduled = await waitUntil {
+            connection.sentStrings.count == 2 &&
+                context.scheduler.scheduled.contains {
+                    $0.delay == TransportConfig.nostrConfirmedSendAckTimeoutSeconds
+                }
+        }
+        XCTAssertTrue(timeoutScheduled)
+        XCTAssertEqual(context.manager.debugPendingMessageQueueCount, 2)
+        NostrRelayManager.registerPendingPrivateEnvelope(id: primary.id)
+        NostrRelayManager.registerPendingPrivateEnvelope(id: legacy.id)
+
+        context.scheduler.runNext()
+        let failed = await waitUntil {
+            context.manager.debugPendingMessageQueueCount == 0 &&
+                terminalFailureCount == 1
+        }
+        XCTAssertTrue(failed)
+
+        try connection.emitOK(eventID: primary.id, success: true, reason: "late")
+        try? await Task.sleep(nanoseconds: 20_000_000)
+        XCTAssertEqual(terminalFailureCount, 1)
+        XCTAssertEqual(context.manager.debugPendingMessageQueueCount, 0)
+        XCTAssertFalse(NostrRelayManager.pendingPrivateEnvelopeIDs.contains(primary.id))
+        XCTAssertFalse(NostrRelayManager.pendingPrivateEnvelopeIDs.contains(legacy.id))
+    }
+
+    func test_privateEnvelopeBatchFastPrimaryRejectionStillWritesCompatibilityHalf() async throws {
+        let relayURL = "wss://private-batch-early-reject.example"
+        let context = makeContext(permission: .denied)
+        let primary = try makeSignedEvent(content: "primary", kind: .privateEnvelope)
+        let legacy = try makeSignedEvent(content: "legacy", kind: .legacyNIP59GiftWrap)
+        var terminalFailureCount = 0
+
+        XCTAssertTrue(context.manager.sendPrivateEnvelopeBatch(
+            [primary, legacy],
+            to: [relayURL],
+            terminalFailure: { terminalFailureCount += 1 }
+        ))
+        let connection = try XCTUnwrap(
+            context.sessionFactory.latestConnection(for: relayURL)
+        )
+        connection.deferSendCompletions = true
+        let firstWriteStarted = await waitUntil { connection.sentStrings.count == 1 }
+        XCTAssertTrue(firstWriteStarted)
+        NostrRelayManager.registerPendingPrivateEnvelope(id: primary.id)
+        NostrRelayManager.registerPendingPrivateEnvelope(id: legacy.id)
+
+        try connection.emitOK(eventID: primary.id, success: false, reason: "invalid: rejected")
+        try? await Task.sleep(nanoseconds: 20_000_000)
+        XCTAssertEqual(context.manager.debugPendingMessageQueueCount, 2)
+        XCTAssertEqual(terminalFailureCount, 0)
+        XCTAssertEqual(connection.sentStrings.count, 1)
+
+        // Completing the primary write must attempt the legacy 1059 even
+        // though the relay has already rejected the provisional 1402.
+        connection.flushDeferredSendCompletions()
+        let compatibilityWriteStarted = await waitUntil {
+            connection.sentStrings.count == 2
+        }
+        XCTAssertTrue(compatibilityWriteStarted)
+        let compatibilityRequest = try XCTUnwrap(connection.sentStrings.last)
+        let compatibilityJSON = try XCTUnwrap(
+            JSONSerialization.jsonObject(
+                with: Data(compatibilityRequest.utf8)
+            ) as? [Any]
+        )
+        let compatibilityEvent = try XCTUnwrap(
+            compatibilityJSON.dropFirst().first as? [String: Any]
+        )
+        XCTAssertEqual(
+            compatibilityEvent["kind"] as? Int,
+            NostrProtocol.EventKind.legacyNIP59GiftWrap.rawValue
+        )
+        XCTAssertEqual(compatibilityEvent["id"] as? String, legacy.id)
+        XCTAssertEqual(context.manager.debugPendingMessageQueueCount, 2)
+        XCTAssertEqual(terminalFailureCount, 0)
+
+        connection.flushDeferredSendCompletions()
+        let failed = await waitUntil {
+            context.manager.debugPendingMessageQueueCount == 0 &&
+                terminalFailureCount == 1
+        }
+        XCTAssertTrue(failed)
+        XCTAssertEqual(connection.cancelCallCount, 0)
+        XCTAssertEqual(
+            context.manager.relays.first(where: { $0.url == relayURL })?.isConnected,
+            true
+        )
+        XCTAssertEqual(terminalFailureCount, 1)
+        XCTAssertFalse(NostrRelayManager.pendingPrivateEnvelopeIDs.contains(primary.id))
+        XCTAssertFalse(NostrRelayManager.pendingPrivateEnvelopeIDs.contains(legacy.id))
+    }
+
+    func test_privateEnvelopeBatchFastRejectionThenDisconnectReplaysWholePair() async throws {
+        let relayURL = "wss://private-batch-early-reject-replay.example"
+        let context = makeContext(permission: .denied)
+        let primary = try makeSignedEvent(content: "primary", kind: .privateEnvelope)
+        let legacy = try makeSignedEvent(content: "legacy", kind: .legacyNIP59GiftWrap)
+        var terminalFailureCount = 0
+
+        XCTAssertTrue(context.manager.sendPrivateEnvelopeBatch(
+            [primary, legacy],
+            to: [relayURL],
+            terminalFailure: { terminalFailureCount += 1 }
+        ))
+        let firstConnection = try XCTUnwrap(
+            context.sessionFactory.latestConnection(for: relayURL)
+        )
+        firstConnection.deferSendCompletions = true
+        let firstWriteStarted = await waitUntil {
+            firstConnection.sentStrings.count == 1
+        }
+        XCTAssertTrue(firstWriteStarted)
+
+        try firstConnection.emitOK(
+            eventID: primary.id,
+            success: false,
+            reason: "invalid: rejected"
+        )
+        try? await Task.sleep(nanoseconds: 20_000_000)
+        XCTAssertEqual(context.manager.debugPendingMessageQueueCount, 2)
+        XCTAssertEqual(terminalFailureCount, 0)
+
+        // Replacing the connection before the sibling write clears the
+        // attempt-scoped rejection. The durable pair must replay in full.
+        context.manager.disconnect()
+        context.manager.connect()
+        let replacementReady = await waitUntil {
+            let connections = context.sessionFactory.connectionsByURL[relayURL] ?? []
+            guard connections.count == 2, let replacement = connections.last else {
+                return false
+            }
+            return replacement.sentStrings.count == 2
+        }
+        XCTAssertTrue(replacementReady)
+        let replacement = try XCTUnwrap(
+            context.sessionFactory.latestConnection(for: relayURL)
+        )
+        try await emitAcceptedPair([primary, legacy], on: replacement)
+        let acknowledged = await waitUntil {
+            context.manager.debugPendingMessageQueueCount == 0
+        }
+        XCTAssertTrue(acknowledged)
+        XCTAssertEqual(terminalFailureCount, 0)
+
+        // The canceled connection's late completion cannot send its sibling
+        // or mutate the replacement attempt.
+        firstConnection.flushDeferredSendCompletions()
+        try? await Task.sleep(nanoseconds: 20_000_000)
+        XCTAssertEqual(firstConnection.sentStrings.count, 1)
+        XCTAssertEqual(context.manager.debugPendingMessageQueueCount, 0)
+        XCTAssertEqual(terminalFailureCount, 0)
+    }
+
+    func test_privateEnvelopeBatchDisconnectDuringWriteReplaysOnReplacementConnection() async throws {
+        let relayURL = "wss://private-batch-background-reconnect.example"
+        let context = makeContext(permission: .denied)
+        let primary = try makeSignedEvent(content: "primary", kind: .privateEnvelope)
+        let legacy = try makeSignedEvent(content: "legacy", kind: .legacyNIP59GiftWrap)
+
+        XCTAssertTrue(context.manager.sendPrivateEnvelopeBatch([primary, legacy], to: [relayURL]))
+        let firstConnection = try XCTUnwrap(
+            context.sessionFactory.latestConnection(for: relayURL)
+        )
+        firstConnection.deferSendCompletions = true
+        let firstWriteStarted = await waitUntil { firstConnection.sentStrings.count == 1 }
+        XCTAssertTrue(firstWriteStarted)
+
+        // Backgrounding cancels the socket while its first write callback is
+        // still outstanding. The pair must remain replayable in the queue.
+        context.manager.disconnect()
+        XCTAssertEqual(context.manager.debugPendingMessageQueueCount, 2)
+        context.manager.connect()
+
+        let replacementReady = await waitUntil {
+            let connections = context.sessionFactory.connectionsByURL[relayURL] ?? []
+            guard connections.count == 2, let replacement = connections.last else {
+                return false
+            }
+            return replacement.sentStrings.count == 2
+        }
+        XCTAssertTrue(replacementReady)
+        let replacement = try XCTUnwrap(
+            context.sessionFactory.latestConnection(for: relayURL)
+        )
+        XCTAssertEqual(context.manager.debugPendingMessageQueueCount, 2)
+        try await emitAcceptedPair([primary, legacy], on: replacement)
+        let acknowledged = await waitUntil {
+            context.manager.debugPendingMessageQueueCount == 0
+        }
+        XCTAssertTrue(acknowledged)
+
+        // A late success callback from the canceled socket must neither send
+        // the legacy half on that stale socket nor disturb the completed pair.
+        firstConnection.flushDeferredSendCompletions()
+        try? await Task.sleep(nanoseconds: 20_000_000)
+        XCTAssertEqual(firstConnection.sentStrings.count, 1)
+        XCTAssertEqual(context.manager.debugPendingMessageQueueCount, 0)
+    }
+
+    private func assertPrivateEnvelopeBatchWriteFailure(
+        failureSequence: [Error?],
+        expectedFirstConnectionWrites: Int
+    ) async throws {
+        let relayURL = "wss://private-batch-write-failure.example"
+        let context = makeContext(permission: .denied)
+        let primary = try makeSignedEvent(content: "primary", kind: .privateEnvelope)
+        let legacy = try makeSignedEvent(content: "legacy", kind: .legacyNIP59GiftWrap)
+
+        XCTAssertTrue(context.manager.sendPrivateEnvelopeBatch([primary, legacy], to: [relayURL]))
+        let firstConnection = try XCTUnwrap(context.sessionFactory.latestConnection(for: relayURL))
+        firstConnection.sendErrorSequence = failureSequence
+
+        let stayedQueued = await waitUntil {
+            firstConnection.sentStrings.count == expectedFirstConnectionWrites &&
+            context.manager.debugPendingMessageQueueEventIDsByBatch.contains([primary.id, legacy.id])
+        }
+        XCTAssertTrue(stayedQueued)
+        XCTAssertEqual(context.manager.debugPendingMessageQueueCount, 2)
+
+        // The failed socket is disconnected with bounded backoff. Its queue
+        // item is reused—not re-admitted—and the replacement retries both
+        // copies before the pair is finally removed.
+        XCTAssertFalse(context.scheduler.scheduled.isEmpty)
+        context.scheduler.runNext()
+        let replacementReady = await waitUntil {
+            guard let replacement = context.sessionFactory.latestConnection(for: relayURL),
+                  replacement !== firstConnection else { return false }
+            return replacement.sentStrings.count == 2
+        }
+        XCTAssertTrue(replacementReady)
+        let replacement = try XCTUnwrap(
+            context.sessionFactory.latestConnection(for: relayURL)
+        )
+        try await emitAcceptedPair([primary, legacy], on: replacement)
+        let acknowledged = await waitUntil {
+            context.manager.debugPendingMessageQueueCount == 0
+        }
+        XCTAssertTrue(acknowledged)
+    }
+
     func test_sendEvent_waitsForTorReadinessBeforeSending() async throws {
         let relayURL = "wss://tor-ready.example"
         let context = makeContext(permission: .denied, userTorEnabled: true, torEnforced: true, torIsReady: false)
@@ -548,6 +1130,52 @@ final class NostrRelayManagerTests: XCTestCase {
         XCTAssertEqual(context.sessionFactory.latestConnection(for: relayURL)?.sentStrings.count, 1)
     }
 
+    func test_subscribe_multiplePrivateEnvelopeFiltersEncodesIndependentLimits() async throws {
+        let relayURL = "wss://private-recovery-filters.example"
+        let context = makeContext(permission: .denied)
+        let filters = NostrFilter.privateEnvelopeFiltersFor(
+            pubkey: "recipient",
+            since: Date(timeIntervalSince1970: 1_234_567)
+        )
+
+        context.manager.subscribe(
+            filters: filters,
+            id: "private-recovery",
+            relayUrls: [relayURL],
+            handler: { _ in }
+        )
+
+        let sent = await waitUntil {
+            context.sessionFactory.latestConnection(for: relayURL)?.sentStrings.count == 1
+        }
+        XCTAssertTrue(sent)
+        let request = try XCTUnwrap(
+            context.sessionFactory.latestConnection(for: relayURL)?.sentStrings.first
+        )
+        let data = try XCTUnwrap(request.data(using: .utf8))
+        let array = try XCTUnwrap(
+            try JSONSerialization.jsonObject(with: data) as? [Any]
+        )
+        XCTAssertEqual(array.count, 4)
+        XCTAssertEqual(array[0] as? String, "REQ")
+        XCTAssertEqual(array[1] as? String, "private-recovery")
+        let encodedFilters = try [array[2], array[3]].map {
+            try XCTUnwrap($0 as? [String: Any])
+        }
+        XCTAssertEqual(encodedFilters.compactMap { $0["kinds"] as? [Int] }, [
+            [NostrProtocol.EventKind.privateEnvelope.rawValue],
+            [NostrProtocol.EventKind.legacyNIP59GiftWrap.rawValue]
+        ])
+        for filter in encodedFilters {
+            XCTAssertEqual(
+                filter["limit"] as? Int,
+                TransportConfig.nostrPrivateEnvelopeFetchLimitPerKind
+            )
+            XCTAssertEqual(filter["#p"] as? [String], ["recipient"])
+            XCTAssertEqual(filter["since"] as? Int, 1_234_567)
+        }
+    }
+
     func test_subscribe_coalescesDuplicateRequestsBeforeTorReadyAndDefersEOSE() async throws {
         let relayURL = "wss://tor-subscribe-coalesce.example"
         let context = makeContext(permission: .denied, userTorEnabled: true, torEnforced: true, torIsReady: false)
@@ -893,11 +1521,11 @@ final class NostrRelayManagerTests: XCTestCase {
         XCTAssertTrue(secondDelivered)
     }
 
-    func test_okMessages_clearPendingGiftWrapIDs() async throws {
+    func test_okMessages_clearPendingPrivateEnvelopeIDs() async throws {
         let relayURL = "wss://ok.example"
         let context = makeContext(permission: .denied)
-        let successID = "gift-wrap-success"
-        let failureID = "gift-wrap-failure"
+        let successID = "private-envelope-success"
+        let failureID = "private-envelope-failure"
 
         context.manager.ensureConnections(to: [relayURL])
         let connected = await waitUntil {
@@ -906,17 +1534,17 @@ final class NostrRelayManagerTests: XCTestCase {
         }
         XCTAssertTrue(connected)
 
-        NostrRelayManager.registerPendingGiftWrap(id: successID)
+        NostrRelayManager.registerPendingPrivateEnvelope(id: successID)
         try context.sessionFactory.latestConnection(for: relayURL)?.emitOK(eventID: successID, success: true, reason: "ok")
         let successCleared = await waitUntil {
-            !NostrRelayManager.pendingGiftWrapIDs.contains(successID)
+            !NostrRelayManager.pendingPrivateEnvelopeIDs.contains(successID)
         }
         XCTAssertTrue(successCleared)
 
-        NostrRelayManager.registerPendingGiftWrap(id: failureID)
+        NostrRelayManager.registerPendingPrivateEnvelope(id: failureID)
         try context.sessionFactory.latestConnection(for: relayURL)?.emitOK(eventID: failureID, success: false, reason: "rejected")
         let failureCleared = await waitUntil {
-            !NostrRelayManager.pendingGiftWrapIDs.contains(failureID)
+            !NostrRelayManager.pendingPrivateEnvelopeIDs.contains(failureID)
         }
         XCTAssertTrue(failureCleared)
     }
@@ -1646,12 +2274,31 @@ final class NostrRelayManagerTests: XCTestCase {
         return filter
     }
 
-    private func makeSignedEvent(content: String) throws -> NostrEvent {
+    private func emitAcceptedPair(
+        _ events: [NostrEvent],
+        on connection: MockRelayConnection
+    ) async throws {
+        for event in events {
+            try connection.emitOK(
+                eventID: event.id,
+                success: true,
+                reason: "accepted"
+            )
+            // Each inbound frame consumes the mock receive handler. Let the
+            // manager re-arm it before delivering the next relay response.
+            try? await Task.sleep(nanoseconds: 20_000_000)
+        }
+    }
+
+    private func makeSignedEvent(
+        content: String,
+        kind: NostrProtocol.EventKind = .textNote
+    ) throws -> NostrEvent {
         let identity = try NostrIdentity.generate()
         let event = NostrEvent(
             pubkey: identity.publicKeyHex,
             createdAt: Date(),
-            kind: .textNote,
+            kind: kind,
             tags: [],
             content: content
         )
@@ -1791,6 +2438,7 @@ private final class MockRelaySessionFactory: NostrRelaySessionProtocol {
 private final class MockRelayConnection: NostrRelayConnectionProtocol {
     private let pingError: Error?
     var sendError: Error?
+    var sendErrorSequence: [Error?] = []
     private var receiveHandler: ((Result<URLSessionWebSocketTask.Message, Error>) -> Void)?
     private(set) var resumeCallCount = 0
     private(set) var cancelCallCount = 0
@@ -1820,14 +2468,15 @@ private final class MockRelayConnection: NostrRelayConnectionProtocol {
     }
 
     var deferSendCompletions = false
-    private var deferredSendCompletions: [(Error?) -> Void] = []
+    private var deferredSendCompletions: [(error: Error?, completion: (Error?) -> Void)] = []
 
     func send(_ message: URLSessionWebSocketTask.Message, completionHandler: @escaping (Error?) -> Void) {
         sentMessages.append(message)
+        let error = sendErrorSequence.isEmpty ? sendError : sendErrorSequence.removeFirst()
         if deferSendCompletions {
-            deferredSendCompletions.append(completionHandler)
+            deferredSendCompletions.append((error, completionHandler))
         } else {
-            completionHandler(sendError)
+            completionHandler(error)
         }
     }
 
@@ -1835,7 +2484,7 @@ private final class MockRelayConnection: NostrRelayConnectionProtocol {
         let pending = deferredSendCompletions
         deferredSendCompletions = []
         pending.forEach {
-            $0(sendError)
+            $0.completion($0.error)
         }
     }
 

bitchatTests/Services/NostrTransportTests.swift

@@ -131,7 +131,7 @@ struct NostrTransportTests {
         #expect(undeliverable)
     }
 
-    @Test("Private message resolves short peer ID and emits decryptable packet")
+    @Test("Private message resolves short peer ID and emits both migration formats")
     @MainActor
     func sendPrivateMessageResolvesShortPeerID() async throws {
         let keychain = MockKeychain()
@@ -153,8 +153,8 @@ struct NostrTransportTests {
                 favoriteStatusForNoiseKey: { _ in nil },
                 favoriteStatusForPeerID: { $0 == shortPeerID ? relationship : nil },
                 currentIdentity: { sender },
-                registerPendingGiftWrap: probe.recordPendingGiftWrap(id:),
-                sendEvent: probe.record(event:),
+                registerPendingPrivateEnvelope: probe.recordPendingPrivateEnvelope(id:),
+                sendPrivateEnvelopeBatch: { events, _ in probe.record(batch: events) },
                 scheduleAfter: { delay, action in
                     probe.enqueueScheduledAction(delay: delay, action: action)
                 }
@@ -164,8 +164,12 @@ struct NostrTransportTests {
 
         transport.sendPrivateMessage("hello over nostr", to: shortPeerID, recipientNickname: "Carol", messageID: "pm-1")
 
-        let didSend = await TestHelpers.waitUntil({ probe.sentEvents.count == 1 }, timeout: 5.0)
+        let didSend = await TestHelpers.waitUntil({ probe.sentEvents.count == 2 }, timeout: 5.0)
         #expect(didSend)
+        #expect(probe.sentEvents.map(\.kind) == [
+            NostrProtocol.EventKind.privateEnvelope.rawValue,
+            NostrProtocol.EventKind.legacyNIP59GiftWrap.rawValue
+        ])
         let result = try decodeEmbeddedPayload(from: probe.sentEvents[0], recipient: recipient)
         let privateMessage = try decodePrivateMessage(from: result.payload)
 
@@ -173,7 +177,583 @@ struct NostrTransportTests {
         #expect(privateMessage.messageID == "pm-1")
         #expect(privateMessage.content == "hello over nostr")
         #expect(result.packet.recipientID == shortPeerID.routingData)
-        #expect(probe.pendingGiftWrapIDs.isEmpty)
+        #expect(probe.pendingPrivateEnvelopeIDs.isEmpty)
+    }
+
+    @Test("Coordinated migration always publishes primary and compatibility envelopes")
+    @MainActor
+    func migrationAlwaysDualPublishes() async throws {
+        let keychain = MockKeychain()
+        let idBridge = NostrIdentityBridge(keychain: keychain)
+        let sender = try NostrIdentity.generate()
+        let recipient = try NostrIdentity.generate()
+        let noiseKey = Data((192..<224).map(UInt8.init))
+        let peerID = PeerID(hexData: noiseKey)
+        let relationship = makeRelationship(
+            peerNoisePublicKey: noiseKey,
+            peerNostrPublicKey: recipient.npub,
+            peerNickname: "Migration peer"
+        )
+
+        let migrationProbe = NostrTransportProbe()
+        let migrationTransport = NostrTransport(
+            keychain: keychain,
+            idBridge: idBridge,
+            dependencies: makeDependencies(
+                favoriteStatusForNoiseKey: { $0 == noiseKey ? relationship : nil },
+                currentIdentity: { sender },
+                sendPrivateEnvelopeBatch: { events, _ in migrationProbe.record(batch: events) }
+            )
+        )
+        migrationTransport.senderPeerID = PeerID(str: "0123456789abcdef")
+        migrationTransport.sendPrivateMessage(
+            "migration payload",
+            to: peerID,
+            recipientNickname: "Migration peer",
+            messageID: "migration-pm"
+        )
+
+        let sentPair = await TestHelpers.waitUntil(
+            { migrationProbe.sentEvents.count == 2 },
+            timeout: 5.0
+        )
+        #expect(sentPair)
+        #expect(migrationProbe.sentEvents.map(\.kind) == [
+            NostrProtocol.EventKind.privateEnvelope.rawValue,
+            NostrProtocol.EventKind.legacyNIP59GiftWrap.rawValue
+        ])
+        for event in migrationProbe.sentEvents {
+            let result = try decodeEmbeddedPayload(from: event, recipient: recipient)
+            let message = try decodePrivateMessage(from: result.payload)
+            #expect(message.messageID == "migration-pm")
+            #expect(message.content == "migration payload")
+        }
+    }
+
+    @Test("Rejected migration batch does not register half-delivery state")
+    @MainActor
+    func rejectedMigrationBatchRegistersNothing() async throws {
+        let keychain = MockKeychain()
+        let idBridge = NostrIdentityBridge(keychain: keychain)
+        let sender = try NostrIdentity.generate()
+        let recipient = try NostrIdentity.generate()
+        let probe = NostrTransportProbe()
+        var rejectedKinds: [Int] = []
+        let transport = NostrTransport(
+            keychain: keychain,
+            idBridge: idBridge,
+            dependencies: makeDependencies(
+                currentIdentity: { sender },
+                registerPendingPrivateEnvelope: probe.recordPendingPrivateEnvelope(id:),
+                sendPrivateEnvelopeBatch: { events, _ in
+                    rejectedKinds = events.map(\.kind)
+                    return false
+                }
+            )
+        )
+        transport.senderPeerID = PeerID(str: "0123456789abcdef")
+
+        transport.sendPrivateMessageGeohash(
+            content: "must stay atomic",
+            toRecipientHex: recipient.publicKeyHex,
+            from: sender,
+            messageID: "atomic-reject"
+        )
+
+        let attempted = await TestHelpers.waitUntil({ rejectedKinds.count == 2 }, timeout: 5.0)
+        #expect(attempted)
+        #expect(rejectedKinds == [
+            NostrProtocol.EventKind.privateEnvelope.rawValue,
+            NostrProtocol.EventKind.legacyNIP59GiftWrap.rawValue
+        ])
+        #expect(probe.pendingPrivateEnvelopeIDs.isEmpty)
+    }
+
+    @Test("Rejected user message emits a visible failed-delivery event")
+    @MainActor
+    func rejectedUserMessageEmitsFailureEvent() async throws {
+        let keychain = MockKeychain()
+        let idBridge = NostrIdentityBridge(keychain: keychain)
+        let sender = try NostrIdentity.generate()
+        let recipient = try NostrIdentity.generate()
+        let eventProbe = NostrTransportEventProbe()
+        let transport = NostrTransport(
+            keychain: keychain,
+            idBridge: idBridge,
+            dependencies: makeDependencies(
+                currentIdentity: { sender },
+                sendPrivateEnvelopeBatch: { _, _ in false }
+            )
+        )
+        transport.senderPeerID = PeerID(str: "0123456789abcdef")
+        transport.eventDelegate = eventProbe
+
+        transport.sendPrivateMessageGeohash(
+            content: "must fail visibly",
+            toRecipientHex: recipient.publicKeyHex,
+            from: sender,
+            messageID: "visible-reject"
+        )
+
+        let reported = await TestHelpers.waitUntil(
+            { eventProbe.failedMessageIDs == ["visible-reject"] },
+            timeout: 5.0
+        )
+        #expect(reported)
+    }
+
+    @Test("Envelope construction failure rejects visibly without publishing")
+    @MainActor
+    func envelopeConstructionFailureRejectsVisibly() async throws {
+        let keychain = MockKeychain()
+        let idBridge = NostrIdentityBridge(keychain: keychain)
+        let sender = try NostrIdentity.generate()
+        let eventProbe = NostrTransportEventProbe()
+        let publicationProbe = NostrTransportProbe()
+        let transport = NostrTransport(
+            keychain: keychain,
+            idBridge: idBridge,
+            dependencies: makeDependencies(
+                currentIdentity: { sender },
+                sendPrivateEnvelopeBatch: { events, _ in
+                    publicationProbe.record(batch: events)
+                }
+            )
+        )
+        transport.senderPeerID = PeerID(str: "0123456789abcdef")
+        transport.eventDelegate = eventProbe
+
+        // Non-empty but invalid hex reaches envelope construction after the
+        // embedded BitChat packet succeeds, reproducing the throwing batch
+        // builder path without allocating an oversized test fixture.
+        let accepted = transport.sendPrivateMessageGeohash(
+            content: "must fail before sent",
+            toRecipientHex: "not-a-hex-public-key",
+            from: sender,
+            messageID: "build-reject"
+        )
+
+        #expect(!accepted)
+        #expect(publicationProbe.sentEvents.isEmpty)
+        #expect(eventProbe.failedMessageIDs == ["build-reject"])
+    }
+
+    @Test("Unencodable user message rejects visibly without publishing")
+    @MainActor
+    func unencodableUserMessageRejectsVisibly() async throws {
+        let keychain = MockKeychain()
+        let idBridge = NostrIdentityBridge(keychain: keychain)
+        let sender = try NostrIdentity.generate()
+        let recipient = try NostrIdentity.generate()
+        let eventProbe = NostrTransportEventProbe()
+        let publicationProbe = NostrTransportProbe()
+        let transport = NostrTransport(
+            keychain: keychain,
+            idBridge: idBridge,
+            dependencies: makeDependencies(
+                currentIdentity: { sender },
+                sendPrivateEnvelopeBatch: { events, _ in
+                    publicationProbe.record(batch: events)
+                }
+            )
+        )
+        transport.senderPeerID = PeerID(str: "0123456789abcdef")
+        transport.eventDelegate = eventProbe
+
+        // PrivateMessagePacket uses the deployed UInt8 content length. Do not
+        // create a larger wire shape that released clients cannot decode.
+        let accepted = transport.sendPrivateMessageGeohash(
+            content: String(repeating: "x", count: 256),
+            toRecipientHex: recipient.publicKeyHex,
+            from: sender,
+            messageID: "packet-reject"
+        )
+
+        #expect(!accepted)
+        #expect(publicationProbe.sentEvents.isEmpty)
+        #expect(eventProbe.failedMessageIDs == ["packet-reject"])
+    }
+
+    @Test("Unencodable direct message emits a visible failure")
+    @MainActor
+    func unencodableDirectMessageEmitsVisibleFailure() async throws {
+        let keychain = MockKeychain()
+        let idBridge = NostrIdentityBridge(keychain: keychain)
+        let sender = try NostrIdentity.generate()
+        let recipient = try NostrIdentity.generate()
+        let noiseKey = Data((224..<256).map(UInt8.init))
+        let peerID = PeerID(hexData: noiseKey)
+        let relationship = makeRelationship(
+            peerNoisePublicKey: noiseKey,
+            peerNostrPublicKey: recipient.npub,
+            peerNickname: "Oversized peer"
+        )
+        let eventProbe = NostrTransportEventProbe()
+        let publicationProbe = NostrTransportProbe()
+        let transport = NostrTransport(
+            keychain: keychain,
+            idBridge: idBridge,
+            dependencies: makeDependencies(
+                favoriteStatusForNoiseKey: {
+                    $0 == noiseKey ? relationship : nil
+                },
+                currentIdentity: { sender },
+                sendPrivateEnvelopeBatch: { events, _ in
+                    publicationProbe.record(batch: events)
+                }
+            )
+        )
+        transport.senderPeerID = PeerID(str: "0123456789abcdef")
+        transport.eventDelegate = eventProbe
+
+        transport.sendPrivateMessage(
+            String(repeating: "x", count: 256),
+            to: peerID,
+            recipientNickname: "Oversized peer",
+            messageID: "direct-packet-reject"
+        )
+
+        let failed = await TestHelpers.waitUntil(
+            {
+                eventProbe.failedMessageIDs
+                    == ["direct-packet-reject"]
+            },
+            timeout: 5.0
+        )
+        #expect(failed)
+        #expect(publicationProbe.sentEvents.isEmpty)
+    }
+
+    @Test("Direct message with an invalid npub emits a visible failure")
+    @MainActor
+    func invalidDirectRecipientNpubEmitsVisibleFailure() async throws {
+        let keychain = MockKeychain()
+        let idBridge = NostrIdentityBridge(keychain: keychain)
+        let sender = try NostrIdentity.generate()
+        let noiseKey = Data(repeating: 0xA5, count: 32)
+        let peerID = PeerID(hexData: noiseKey)
+        let relationship = makeRelationship(
+            peerNoisePublicKey: noiseKey,
+            peerNostrPublicKey: "not-a-valid-npub",
+            peerNickname: "Invalid npub peer"
+        )
+        let eventProbe = NostrTransportEventProbe()
+        let publicationProbe = NostrTransportProbe()
+        let transport = NostrTransport(
+            keychain: keychain,
+            idBridge: idBridge,
+            dependencies: makeDependencies(
+                favoriteStatusForNoiseKey: {
+                    $0 == noiseKey ? relationship : nil
+                },
+                currentIdentity: { sender },
+                sendPrivateEnvelopeBatch: { events, _ in
+                    publicationProbe.record(batch: events)
+                }
+            )
+        )
+        transport.senderPeerID = PeerID(str: "0123456789abcdef")
+        transport.eventDelegate = eventProbe
+
+        transport.sendPrivateMessage(
+            "must fail before publication",
+            to: peerID,
+            recipientNickname: "Invalid npub peer",
+            messageID: "invalid-npub"
+        )
+
+        let failed = await TestHelpers.waitUntil(
+            { eventProbe.failedMessageIDs == ["invalid-npub"] },
+            timeout: 5.0
+        )
+        #expect(failed)
+        #expect(publicationProbe.sentEvents.isEmpty)
+    }
+
+    @Test("Direct message without a resolvable recipient emits a visible failure")
+    @MainActor
+    func missingDirectRecipientEmitsVisibleFailure() async throws {
+        let keychain = MockKeychain()
+        let idBridge = NostrIdentityBridge(keychain: keychain)
+        let sender = try NostrIdentity.generate()
+        let peerID = PeerID(hexData: Data(repeating: 0xC3, count: 32))
+        let eventProbe = NostrTransportEventProbe()
+        let publicationProbe = NostrTransportProbe()
+        let transport = NostrTransport(
+            keychain: keychain,
+            idBridge: idBridge,
+            dependencies: makeDependencies(
+                currentIdentity: { sender },
+                sendPrivateEnvelopeBatch: { events, _ in
+                    publicationProbe.record(batch: events)
+                }
+            )
+        )
+        transport.senderPeerID = PeerID(str: "0123456789abcdef")
+        transport.eventDelegate = eventProbe
+
+        transport.sendPrivateMessage(
+            "must fail without recipient",
+            to: peerID,
+            recipientNickname: "Unknown peer",
+            messageID: "missing-recipient"
+        )
+
+        let failed = await TestHelpers.waitUntil(
+            { eventProbe.failedMessageIDs == ["missing-recipient"] },
+            timeout: 5.0
+        )
+        #expect(failed)
+        #expect(publicationProbe.sentEvents.isEmpty)
+    }
+
+    @Test("Direct message without a current identity emits a visible failure")
+    @MainActor
+    func missingDirectSenderIdentityEmitsVisibleFailure() async throws {
+        let keychain = MockKeychain()
+        let idBridge = NostrIdentityBridge(keychain: keychain)
+        let recipient = try NostrIdentity.generate()
+        let noiseKey = Data(repeating: 0x5A, count: 32)
+        let peerID = PeerID(hexData: noiseKey)
+        let relationship = makeRelationship(
+            peerNoisePublicKey: noiseKey,
+            peerNostrPublicKey: recipient.npub,
+            peerNickname: "Missing identity peer"
+        )
+        let eventProbe = NostrTransportEventProbe()
+        let publicationProbe = NostrTransportProbe()
+        let transport = NostrTransport(
+            keychain: keychain,
+            idBridge: idBridge,
+            dependencies: makeDependencies(
+                favoriteStatusForNoiseKey: {
+                    $0 == noiseKey ? relationship : nil
+                },
+                currentIdentity: { nil },
+                sendPrivateEnvelopeBatch: { events, _ in
+                    publicationProbe.record(batch: events)
+                }
+            )
+        )
+        transport.senderPeerID = PeerID(str: "0123456789abcdef")
+        transport.eventDelegate = eventProbe
+
+        transport.sendPrivateMessage(
+            "must fail without identity",
+            to: peerID,
+            recipientNickname: "Missing identity peer",
+            messageID: "missing-identity"
+        )
+
+        let failed = await TestHelpers.waitUntil(
+            { eventProbe.failedMessageIDs == ["missing-identity"] },
+            timeout: 5.0
+        )
+        #expect(failed)
+        #expect(publicationProbe.sentEvents.isEmpty)
+    }
+
+    @Test("Rejected favorite notification retains and retries the exact pair")
+    @MainActor
+    func rejectedFavoriteNotificationRetriesExactPair() async throws {
+        let keychain = MockKeychain()
+        let idBridge = NostrIdentityBridge(keychain: keychain)
+        let sender = try NostrIdentity.generate()
+        let recipient = try NostrIdentity.generate()
+        let noiseKey = Data((96..<128).map(UInt8.init))
+        let fullPeerID = PeerID(hexData: noiseKey)
+        let relationship = makeRelationship(
+            peerNoisePublicKey: noiseKey,
+            peerNostrPublicKey: recipient.npub,
+            peerNickname: "Retry favorite"
+        )
+        let probe = NostrTransportProbe()
+        var attempts: [[String]] = []
+        weak var releasedTransport: NostrTransport?
+        do {
+            let transport = NostrTransport(
+                keychain: keychain,
+                idBridge: idBridge,
+                dependencies: makeDependencies(
+                    favoriteStatusForNoiseKey: { $0 == noiseKey ? relationship : nil },
+                    currentIdentity: { sender },
+                    sendPrivateEnvelopeBatch: { events, _ in
+                        attempts.append(events.map(\.id))
+                        return attempts.count > 1
+                    },
+                    scheduleAfter: { delay, action in
+                        probe.enqueueScheduledAction(delay: delay, action: action)
+                    }
+                )
+            )
+            transport.senderPeerID = PeerID(str: "0123456789abcdef")
+            releasedTransport = transport
+
+            transport.sendFavoriteNotification(to: fullPeerID, isFavorite: true)
+            let retryScheduled = await TestHelpers.waitUntil(
+                { attempts.count == 1 && probe.scheduledActionCount == 1 },
+                timeout: 5.0
+            )
+            #expect(retryScheduled)
+        }
+        #expect(releasedTransport == nil)
+        #expect(probe.runNextScheduledAction())
+
+        let retried = await TestHelpers.waitUntil({ attempts.count == 2 }, timeout: 5.0)
+        #expect(retried)
+        #expect(attempts[0] == attempts[1])
+    }
+
+    @Test("Rejected delivery acknowledgement remains queued for retry")
+    @MainActor
+    func rejectedDeliveryAckRetries() async throws {
+        let keychain = MockKeychain()
+        let idBridge = NostrIdentityBridge(keychain: keychain)
+        let sender = try NostrIdentity.generate()
+        let recipient = try NostrIdentity.generate()
+        let noiseKey = Data((128..<160).map(UInt8.init))
+        let fullPeerID = PeerID(hexData: noiseKey)
+        let relationship = makeRelationship(
+            peerNoisePublicKey: noiseKey,
+            peerNostrPublicKey: recipient.npub,
+            peerNickname: "Retry ack"
+        )
+        let probe = NostrTransportProbe()
+        var attempts: [[String]] = []
+        let transport = NostrTransport(
+            keychain: keychain,
+            idBridge: idBridge,
+            dependencies: makeDependencies(
+                favoriteStatusForNoiseKey: { $0 == noiseKey ? relationship : nil },
+                currentIdentity: { sender },
+                sendPrivateEnvelopeBatch: { events, _ in
+                    attempts.append(events.map(\.id))
+                    return attempts.count > 1
+                },
+                scheduleAfter: { delay, action in
+                    probe.enqueueScheduledAction(delay: delay, action: action)
+                }
+            )
+        )
+        transport.senderPeerID = PeerID(str: "0123456789abcdef")
+
+        transport.sendDeliveryAck(for: "retry-ack", to: fullPeerID)
+        let firstAttempt = await TestHelpers.waitUntil(
+            { attempts.count == 1 && probe.scheduledActionCount >= 1 },
+            timeout: 5.0
+        )
+        #expect(firstAttempt)
+
+        for _ in 0..<3 where attempts.count < 2 {
+            _ = probe.runNextScheduledAction()
+            _ = await TestHelpers.waitUntil(
+                { attempts.count == 2 || probe.scheduledActionCount > 0 },
+                timeout: 1.0
+            )
+        }
+        #expect(attempts.count == 2)
+        #expect(attempts[0] == attempts[1])
+    }
+
+    @Test("Control retry queue is bounded and evicted callbacks are harmless")
+    @MainActor
+    func controlRetryQueueIsBounded() async throws {
+        let sender = try NostrIdentity.generate()
+        let recipient = try NostrIdentity.generate()
+        let events = try NostrProtocol.createPrivateEnvelopePublicationBatch(
+            content: "bounded retry fixture",
+            recipientPubkey: recipient.publicKeyHex,
+            senderIdentity: sender
+        )
+        let probe = NostrTransportProbe()
+        var retryAttempts = 0
+        let queue = NostrPrivateEnvelopeRetryQueue(
+            sendPrivateEnvelopeBatch: { _, _ in
+                retryAttempts += 1
+                return false
+            },
+            registerPendingPrivateEnvelope: { _ in },
+            scheduleAfter: { delay, action in
+                probe.enqueueScheduledAction(delay: delay, action: action)
+            }
+        )
+
+        for index in 0...TransportConfig.nostrPrivateEnvelopeRetryQueueCap {
+            queue.enqueue(
+                key: "control-\(index)",
+                events: events,
+                registerPending: false
+            )
+        }
+
+        #expect(queue.debugPendingCount == TransportConfig.nostrPrivateEnvelopeRetryQueueCap)
+        #expect(!queue.debugContains(key: "control-0"))
+        #expect(queue.debugContains(key: "control-1"))
+
+        // The oldest callback was scheduled before eviction. Running it must
+        // observe the missing key and return without touching dependencies.
+        #expect(probe.runNextScheduledAction())
+        try? await Task.sleep(nanoseconds: 20_000_000)
+        #expect(retryAttempts == 0)
+
+        queue.removeAll()
+        #expect(queue.debugPendingCount == 0)
+        #expect(probe.runNextScheduledAction())
+        try? await Task.sleep(nanoseconds: 20_000_000)
+        #expect(retryAttempts == 0)
+    }
+
+    @Test("Multiple transports share one globally bounded control retry owner")
+    @MainActor
+    func multipleTransportsShareControlRetryQueue() async throws {
+        let keychain = MockKeychain()
+        let idBridge = NostrIdentityBridge(keychain: keychain)
+        let sender = try NostrIdentity.generate()
+        let recipient = try NostrIdentity.generate()
+        let events = try NostrProtocol.createPrivateEnvelopePublicationBatch(
+            content: "shared retry fixture",
+            recipientPubkey: recipient.publicKeyHex,
+            senderIdentity: sender
+        )
+        let probe = NostrTransportProbe()
+        var retryAttempts = 0
+        let sharedQueue = NostrPrivateEnvelopeRetryQueue(
+            sendPrivateEnvelopeBatch: { _, _ in
+                retryAttempts += 1
+                return false
+            },
+            registerPendingPrivateEnvelope: { _ in },
+            scheduleAfter: { delay, action in
+                probe.enqueueScheduledAction(delay: delay, action: action)
+            }
+        )
+        let first = NostrTransport(
+            keychain: keychain,
+            idBridge: idBridge,
+            dependencies: makeDependencies(envelopeRetryQueue: sharedQueue)
+        )
+        let second = NostrTransport(
+            keychain: keychain,
+            idBridge: idBridge,
+            dependencies: makeDependencies(envelopeRetryQueue: sharedQueue)
+        )
+
+        first.debugEnqueueControlRetry(key: "shared", events: events)
+        second.debugEnqueueControlRetry(key: "shared", events: events)
+        #expect(first.debugControlRetryCount == 1)
+        #expect(second.debugControlRetryCount == 1)
+
+        for index in 0...TransportConfig.nostrPrivateEnvelopeRetryQueueCap {
+            let transport = index.isMultiple(of: 2) ? first : second
+            transport.debugEnqueueControlRetry(key: "global-\(index)", events: events)
+        }
+        #expect(first.debugControlRetryCount == TransportConfig.nostrPrivateEnvelopeRetryQueueCap)
+        #expect(second.debugControlRetryCount == TransportConfig.nostrPrivateEnvelopeRetryQueueCap)
+
+        // The first scheduled callback belongs to the now-evicted shared key.
+        #expect(probe.runNextScheduledAction())
+        try? await Task.sleep(nanoseconds: 20_000_000)
+        #expect(retryAttempts == 0)
     }
 
     @Test("Favorite notification embeds current npub")
@@ -198,8 +778,8 @@ struct NostrTransportTests {
                 favoriteStatusForNoiseKey: { $0 == noiseKey ? relationship : nil },
                 favoriteStatusForPeerID: { _ in nil },
                 currentIdentity: { sender },
-                registerPendingGiftWrap: probe.recordPendingGiftWrap(id:),
-                sendEvent: probe.record(event:),
+                registerPendingPrivateEnvelope: probe.recordPendingPrivateEnvelope(id:),
+                sendPrivateEnvelopeBatch: { events, _ in probe.record(batch: events) },
                 scheduleAfter: { delay, action in
                     probe.enqueueScheduledAction(delay: delay, action: action)
                 }
@@ -209,7 +789,7 @@ struct NostrTransportTests {
 
         transport.sendFavoriteNotification(to: fullPeerID, isFavorite: true)
 
-        let didSend = await TestHelpers.waitUntil({ probe.sentEvents.count == 1 }, timeout: 5.0)
+        let didSend = await TestHelpers.waitUntil({ probe.sentEvents.count == 2 }, timeout: 5.0)
         #expect(didSend)
         let result = try decodeEmbeddedPayload(from: probe.sentEvents[0], recipient: recipient)
         let privateMessage = try decodePrivateMessage(from: result.payload)
@@ -239,8 +819,8 @@ struct NostrTransportTests {
                 favoriteStatusForNoiseKey: { $0 == noiseKey ? relationship : nil },
                 favoriteStatusForPeerID: { _ in nil },
                 currentIdentity: { sender },
-                registerPendingGiftWrap: probe.recordPendingGiftWrap(id:),
-                sendEvent: probe.record(event:),
+                registerPendingPrivateEnvelope: probe.recordPendingPrivateEnvelope(id:),
+                sendPrivateEnvelopeBatch: { events, _ in probe.record(batch: events) },
                 scheduleAfter: { delay, action in
                     probe.enqueueScheduledAction(delay: delay, action: action)
                 }
@@ -250,7 +830,7 @@ struct NostrTransportTests {
 
         transport.sendDeliveryAck(for: "ack-1", to: fullPeerID)
 
-        let didSend = await TestHelpers.waitUntil({ probe.sentEvents.count == 1 }, timeout: 5.0)
+        let didSend = await TestHelpers.waitUntil({ probe.sentEvents.count == 2 }, timeout: 5.0)
         #expect(didSend)
         let result = try decodeEmbeddedPayload(from: probe.sentEvents[0], recipient: recipient)
 
@@ -259,9 +839,9 @@ struct NostrTransportTests {
         #expect(result.packet.recipientID == fullPeerID.toShort().routingData)
     }
 
-    @Test("Geohash private message registers pending gift wrap")
+    @Test("Geohash private message registers pending private envelope")
     @MainActor
-    func sendPrivateMessageGeohashRegistersPendingGiftWrap() async throws {
+    func sendPrivateMessageGeohashRegistersPendingPrivateEnvelope() async throws {
         let keychain = MockKeychain()
         let idBridge = NostrIdentityBridge(keychain: keychain)
         let sender = try NostrIdentity.generate()
@@ -272,8 +852,8 @@ struct NostrTransportTests {
             idBridge: idBridge,
             dependencies: makeDependencies(
                 currentIdentity: { sender },
-                registerPendingGiftWrap: probe.recordPendingGiftWrap(id:),
-                sendEvent: probe.record(event:),
+                registerPendingPrivateEnvelope: probe.recordPendingPrivateEnvelope(id:),
+                sendPrivateEnvelopeBatch: { events, _ in probe.record(batch: events) },
                 scheduleAfter: { delay, action in
                     probe.enqueueScheduledAction(delay: delay, action: action)
                 }
@@ -288,7 +868,7 @@ struct NostrTransportTests {
             messageID: "geo-1"
         )
 
-        let didSend = await TestHelpers.waitUntil({ probe.sentEvents.count == 1 }, timeout: 5.0)
+        let didSend = await TestHelpers.waitUntil({ probe.sentEvents.count == 2 }, timeout: 5.0)
         #expect(didSend)
         let event = probe.sentEvents[0]
         let result = try decodeEmbeddedPayload(from: event, recipient: recipient)
@@ -297,7 +877,7 @@ struct NostrTransportTests {
         #expect(privateMessage.messageID == "geo-1")
         #expect(privateMessage.content == "geo hello")
         #expect(result.packet.recipientID == nil)
-        #expect(probe.pendingGiftWrapIDs == [event.id])
+        #expect(probe.pendingPrivateEnvelopeIDs == probe.sentEvents.map(\.id))
     }
 
     @Test("Read receipt queue sends in order and waits for scheduler")
@@ -322,8 +902,8 @@ struct NostrTransportTests {
                 favoriteStatusForNoiseKey: { $0 == noiseKey ? relationship : nil },
                 favoriteStatusForPeerID: { _ in nil },
                 currentIdentity: { sender },
-                registerPendingGiftWrap: probe.recordPendingGiftWrap(id:),
-                sendEvent: probe.record(event:),
+                registerPendingPrivateEnvelope: probe.recordPendingPrivateEnvelope(id:),
+                sendPrivateEnvelopeBatch: { events, _ in probe.record(batch: events) },
                 scheduleAfter: { delay, action in
                     probe.enqueueScheduledAction(delay: delay, action: action)
                 }
@@ -338,20 +918,20 @@ struct NostrTransportTests {
         transport.sendReadReceipt(second, to: fullPeerID)
 
         let readReceiptTimeout: TimeInterval = 5.0
-        let sentFirst = await TestHelpers.waitUntil({ probe.sentEvents.count >= 1 }, timeout: readReceiptTimeout)
-        try #require(sentFirst, "Expected first queued read receipt event")
+        let sentFirst = await TestHelpers.waitUntil({ probe.sentEvents.count == 2 }, timeout: readReceiptTimeout)
+        try #require(sentFirst, "Expected first queued read receipt pair")
         let scheduledThrottle = await TestHelpers.waitUntil({ probe.scheduledActionCount == 1 }, timeout: readReceiptTimeout)
         try #require(scheduledThrottle, "Expected queued throttle action after first read receipt")
-        let firstEvent = try #require(probe.sentEvents.first, "Expected first queued read receipt event")
+        let firstEvent = try #require(probe.sentEvents.first, "Expected first queued read receipt pair")
         let firstPayload = try decodeEmbeddedPayload(from: firstEvent, recipient: recipient).payload
         #expect(firstPayload.type == .readReceipt)
         #expect(String(data: firstPayload.data, encoding: .utf8) == "read-1")
 
         try #require(probe.runNextScheduledAction(), "Expected queued throttle action after first read receipt")
 
-        let sentSecond = await TestHelpers.waitUntil({ probe.sentEvents.count >= 2 }, timeout: readReceiptTimeout)
-        try #require(sentSecond, "Expected second read receipt after running throttle action")
-        let secondEvent = try #require(probe.sentEvents.last, "Expected second queued read receipt event")
+        let sentSecond = await TestHelpers.waitUntil({ probe.sentEvents.count == 4 }, timeout: readReceiptTimeout)
+        try #require(sentSecond, "Expected second read receipt pair after running throttle action")
+        let secondEvent = probe.sentEvents[2]
         let secondPayload = try decodeEmbeddedPayload(from: secondEvent, recipient: recipient).payload
         #expect(secondPayload.type == .readReceipt)
         #expect(String(data: secondPayload.data, encoding: .utf8) == "read-2")
@@ -419,10 +999,14 @@ struct NostrTransportTests {
         favoriteStatusForNoiseKey: @escaping @MainActor (Data) -> FavoriteRelationship? = { _ in nil },
         favoriteStatusForPeerID: @escaping @MainActor (PeerID) -> FavoriteRelationship? = { _ in nil },
         currentIdentity: @escaping @MainActor () throws -> NostrIdentity? = { nil },
-        registerPendingGiftWrap: @escaping @MainActor (String) -> Void = { _ in },
-        sendEvent: @escaping @MainActor (NostrEvent) -> Void = { _ in },
+        registerPendingPrivateEnvelope: @escaping @MainActor (String) -> Void = { _ in },
+        sendPrivateEnvelopeBatch: @escaping @MainActor (
+            [NostrEvent],
+            @escaping @MainActor () -> Void
+        ) -> Bool = { _, _ in true },
         scheduleAfter: @escaping @Sendable (TimeInterval, @escaping @Sendable () -> Void) -> Void = { _, _ in },
-        relayConnectivity: @escaping @MainActor () -> AnyPublisher<Bool, Never> = { Just(false).eraseToAnyPublisher() }
+        relayConnectivity: @escaping @MainActor () -> AnyPublisher<Bool, Never> = { Just(false).eraseToAnyPublisher() },
+        envelopeRetryQueue: NostrPrivateEnvelopeRetryQueue? = nil
     ) -> NostrTransport.Dependencies {
         NostrTransport.Dependencies(
             notificationCenter: notificationCenter,
@@ -430,10 +1014,11 @@ struct NostrTransportTests {
             favoriteStatusForNoiseKey: favoriteStatusForNoiseKey,
             favoriteStatusForPeerID: favoriteStatusForPeerID,
             currentIdentity: currentIdentity,
-            registerPendingGiftWrap: registerPendingGiftWrap,
-            sendEvent: sendEvent,
+            registerPendingPrivateEnvelope: registerPendingPrivateEnvelope,
+            sendPrivateEnvelopeBatch: sendPrivateEnvelopeBatch,
             scheduleAfter: scheduleAfter,
-            relayConnectivity: relayConnectivity
+            relayConnectivity: relayConnectivity,
+            envelopeRetryQueue: envelopeRetryQueue
         )
     }
 
@@ -457,8 +1042,8 @@ struct NostrTransportTests {
         from event: NostrEvent,
         recipient: NostrIdentity
     ) throws -> (packet: BitchatPacket, payload: NoisePayload, senderPubkey: String) {
-        let (content, senderPubkey, _) = try NostrProtocol.decryptPrivateMessage(
-            giftWrap: event,
+        let (content, senderPubkey, _) = try NostrProtocol.decryptPrivateEnvelope(
+            envelope: event,
             recipientIdentity: recipient
         )
         guard content.hasPrefix("bitchat1:") else {
@@ -488,6 +1073,17 @@ private enum NostrTransportTestError: Error {
     case invalidPrivateMessage
 }
 
+@MainActor
+private final class NostrTransportEventProbe: TransportEventDelegate {
+    private(set) var failedMessageIDs: [String] = []
+
+    func didReceiveTransportEvent(_ event: TransportEvent) {
+        guard case .messageDeliveryStatusUpdated(let messageID, let status) = event,
+              case .failed = status else { return }
+        failedMessageIDs.append(messageID)
+    }
+}
+
 private func base64URLDecode(_ string: String) -> Data? {
     var candidate = string
     let padding = (4 - (candidate.count % 4)) % 4
@@ -503,7 +1099,7 @@ private func base64URLDecode(_ string: String) -> Data? {
 private final class NostrTransportProbe: @unchecked Sendable {
     private let lock = NSLock()
     private var sentEventsStorage: [NostrEvent] = []
-    private var pendingGiftWrapIDsStorage: [String] = []
+    private var pendingPrivateEnvelopeIDsStorage: [String] = []
     private var scheduledActionsStorage: [(@Sendable () -> Void)] = []
 
     var sentEvents: [NostrEvent] {
@@ -512,10 +1108,10 @@ private final class NostrTransportProbe: @unchecked Sendable {
         return sentEventsStorage
     }
 
-    var pendingGiftWrapIDs: [String] {
+    var pendingPrivateEnvelopeIDs: [String] {
         lock.lock()
         defer { lock.unlock() }
-        return pendingGiftWrapIDsStorage
+        return pendingPrivateEnvelopeIDsStorage
     }
 
     var scheduledActionCount: Int {
@@ -524,15 +1120,16 @@ private final class NostrTransportProbe: @unchecked Sendable {
         return scheduledActionsStorage.count
     }
 
-    func record(event: NostrEvent) {
+    func record(batch: [NostrEvent]) -> Bool {
         lock.lock()
-        sentEventsStorage.append(event)
+        sentEventsStorage.append(contentsOf: batch)
         lock.unlock()
+        return true
     }
 
-    func recordPendingGiftWrap(id: String) {
+    func recordPendingPrivateEnvelope(id: String) {
         lock.lock()
-        pendingGiftWrapIDsStorage.append(id)
+        pendingPrivateEnvelopeIDsStorage.append(id)
         lock.unlock()
     }
 

bitchatTests/ViewSmokeTests.swift

@@ -551,6 +551,89 @@ struct ViewSmokeTests {
         #expect(featureModels.privateConversationModel.selectedHeaderState?.headerPeerID == peerID)
     }
 
+    @Test("Root Bluetooth alert waits for location and notices sheets")
+    func rootBluetoothAlertGuard_includesHeaderSheets() {
+        #expect(!ContentRootModalPresentationState().hasPresentation)
+        #expect(
+            ContentRootModalPresentationState(
+                isLocationChannelsSheetPresented: true
+            ).hasPresentation
+        )
+        #expect(
+            ContentRootModalPresentationState(
+                isNoticesSheetPresented: true
+            ).hasPresentation
+        )
+    }
+
+    @Test("People-sheet Bluetooth alert waits for local verification sheet")
+    func peopleSheetBluetoothAlertGuard_includesVerificationSheet() {
+        #expect(!ContentPeopleSheetModalPresentationState().hasPresentation)
+        #expect(
+            ContentPeopleSheetModalPresentationState(
+                isVerificationSheetPresented: true
+            ).hasPresentation
+        )
+    }
+
+    @Test("Root Bluetooth alert waits for screenshot privacy alert")
+    @MainActor
+    func rootBluetoothAlertGuard_tracksScreenshotPrivacyState() {
+        let (viewModel, _, _) = makeSmokeViewModel()
+        let featureModels = makeSmokeFeatureModels(for: viewModel)
+
+        #expect(
+            !ContentRootModalPresentationState(
+                appChromeModel: featureModels.appChromeModel
+            ).hasPresentation
+        )
+
+        featureModels.appChromeModel.showScreenshotPrivacyWarning = true
+
+        #expect(
+            ContentRootModalPresentationState(
+                appChromeModel: featureModels.appChromeModel
+            ).hasPresentation
+        )
+    }
+
+    @Test("People-sheet Bluetooth alert waits for legacy media consent")
+    @MainActor
+    func peopleSheetBluetoothAlertGuard_tracksLegacyConsentState() async {
+        let (viewModel, _, _) = makeSmokeViewModel()
+        let featureModels = makeSmokeFeatureModels(for: viewModel)
+
+        #expect(
+            !ContentPeopleSheetModalPresentationState(
+                legacyPrivateMediaConsentRequest:
+                    featureModels.conversationUIModel
+                        .legacyPrivateMediaConsentRequest
+            ).hasPresentation
+        )
+
+        viewModel.enqueueLegacyPrivateMediaConsent(
+            for: PeerID(str: "5152535455565758"),
+            transferId: "legacy-consent-transfer",
+            messageID: "legacy-consent-message"
+        ) { _ in }
+        defer { viewModel.cancelAllLegacyPrivateMediaConsents() }
+
+        let consentPropagated = await TestHelpers.waitUntil {
+            featureModels.conversationUIModel
+                .legacyPrivateMediaConsentRequest != nil
+        }
+        #expect(
+            consentPropagated
+        )
+        #expect(
+            ContentPeopleSheetModalPresentationState(
+                legacyPrivateMediaConsentRequest:
+                    featureModels.conversationUIModel
+                        .legacyPrivateMediaConsentRequest
+            ).hasPresentation
+        )
+    }
+
     @Test
     func geohashAndTextMessageViews_renderCoreBranches() {
         let (viewModel, _, _) = makeSmokeViewModel()

docs/privacy-assessment.md

@@ -54,9 +54,9 @@ Public archives contain content already intended for public mesh/board distribut
 
 ## Nostr and Mesh Bridge
 
-- NIP-17/NIP-44 v2 private fallback protects plaintext with secp256k1 key agreement, HKDF-SHA256, and XChaCha20-Poly1305. Relays still see event and network metadata.
+- BitChat's proprietary private-envelope fallback protects plaintext with secp256k1 key agreement, HKDF-SHA256 with a BitChat-specific domain separator, and XChaCha20-Poly1305. It is not NIP-17, NIP-44, or NIP-59 compatible and does not provide forward secrecy against later compromise of the recipient's static Nostr private key. Relays still see the recipient public-key tag, event timing and size, and network metadata.
 - Bridge courier drops use a throwaway publisher key, an opaque Noise-sealed envelope, and a day-rotating recipient tag. Only a party already holding the recipient's Noise static key can compute candidate tags.
-- Relay publication is considered successful only after an explicit NIP-20 `OK true` from at least one target relay. Rejected, disconnected, timed-out, or merely socket-written events stay retryable.
+- Relay publication is considered successful only after an explicit NIP-01 `OK true` from at least one target relay. Rejected, disconnected, timed-out, or merely socket-written events stay retryable.
 - When mesh bridge is enabled, public mesh messages not marked “nearby only” are signed under a per-cell Nostr identity and published to a neighborhood rendezvous geohash. Presence and public bridge traffic therefore expose a coarse area to relays and participants.
 - A bridge gateway can carry signed bridge/location events and opaque courier drops for nearby mesh-only peers. It cannot validly publish a neighbor's radio-only message because the author must first sign the bridge event.