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NIP-13 proof-of-work for geohash channels: mine on send, relax rate limits for PoW senders

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Outgoing kind-20000 geohash messages mine a NIP-13 nonce tag (8 leading
zero bits, ~256 hashes, typically <1 ms) off the main actor before
signing. Mining is hard-capped at 2 s and cancellable (newer send or
channel switch): on cap/cancel the committed target steps down so the
message still ships promptly with an honest commitment - sending is
never blocked and nothing is dropped. The hot loop serializes the
canonical event once and rewrites only the fixed-width nonce bytes.

Inbound kind-20000 events are scored per NIP-13 commitment semantics
(committed target counts; the ID must actually meet it, extra work
earns nothing) and never hard-rejected: validated PoW >= 8 bits skips
the per-sender rate-limit bucket while the per-content flood bucket
still applies, so old non-mining clients keep working under today's
strict limits while bulk spam gets expensive.

Presence heartbeats (kind 20001), kind-1 notes, and DMs are unchanged;
no UI beyond a pow= field in an existing sampled debug log.

Reimplemented from scratch rather than cherry-picking the stale
feature/pow-geohash-mining-ui branch (unbounded loop, hard receive
filtering, mining UI, XCTest, force unwraps).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
jack
2026-07-06 20:18:00 +02:00
co-authored by Claude Fable 5
parent 7341696280
commit b1ff5e6b82
14 changed files with 769 additions and 126 deletions
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bitchatTests/ChatPublicConversationCoordinatorContextTests.swift
+3 -3
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@@ -186,7 +186,7 @@ private final class MockChatPublicConversationContext: ChatPublicConversationCon
// Inbound public message processing
var blockedMessageIDs: Set<String> = []
var rateLimitAllowed = true
private(set) var rateLimitChecks: [(senderKey: String, contentKey: String)] = []
private(set) var rateLimitChecks: [(senderKey: String, contentKey: String, powBits: Int)] = []
private(set) var enqueuedMessages: [(messageID: String, conversationID: ConversationID)] = []
var enqueuedMessageIDs: [String] { enqueuedMessages.map(\.messageID) }
var stablePeerIDs: [PeerID: PeerID] = [:]
@@ -199,8 +199,8 @@ private final class MockChatPublicConversationContext: ChatPublicConversationCon
blockedMessageIDs.contains(message.id)
}
func allowPublicMessage(senderKey: String, contentKey: String) -> Bool {
rateLimitChecks.append((senderKey, contentKey))
func allowPublicMessage(senderKey: String, contentKey: String, powBits: Int) -> Bool {
rateLimitChecks.append((senderKey, contentKey, powBits))
return rateLimitAllowed
}