Ark zaps PoC — a NIP-61-shaped zap protocol over arkoor

Lightning zaps are welded to LNURL+bolt11; nutzaps (NIP-61) proved the
alternative shape, and ark fits it better than Cashu because delivery
already exists (the mailbox). Draft protocol, kinds provisional:
kind 10037 (replaceable) announces the wallet's ark address+network;
the zap itself is a plain instant arkoor send; kind 9737 is the
sender-signed receipt tagging recipient, amount, comment, and the
delivered vtxo id — so the receipt is checkable against the actual
payment, unlike a bare attestation.

UX: paste an npub into Send and hal offers the zap (needs both the ark
and sync features; npub decoding is inline bech32 so ark-only builds
stay lean). The nostr layer gains generic publishEvent/fetchEvents,
exposed through the sync seam as wallet.nostrPublish/nostrFetch.

Proven on regtest against a mini NIP-01 relay: announce, resolve,
zap 1,000 sats with a comment, instant receipt+delivery, vtxo match.

Co-Authored-By: Claude Fable 5 <[email protected]>

1 files changed, 16 insertions, 0 deletions

diff --git a/src/features/sync.js b/src/features/sync.js
index f927aef..8349b5d 100644
--- a/src/features/sync.js
+++ b/src/features/sync.js
@@ -22,6 +22,22 @@ export function installSyncWallet(wallet) {
       return this.nostr && this.nostr.sk ? this.nostr.sendDM(recipientPkHex, text) : false;
     },
 
+    // Generic event publish/fetch on the configured sync relays — the seam
+    // other features (ark zaps) use to speak their own kinds. No-ops when
+    // sync is disabled or the wallet is offline.
+    async nostrPublish(partial) {
+      const sync = getSyncConfig();
+      if (this.offline || !sync.enabled || !this.nostr.sk) return null;
+      this.nostr.setRelays(sync.relays);
+      return this.nostr.publishEvent(partial);
+    },
+    async nostrFetch(filter, maxWait) {
+      const sync = getSyncConfig();
+      if (this.offline || !sync.enabled) return [];
+      this.nostr.setRelays(sync.relays);
+      return this.nostr.fetchEvents(filter, maxWait);
+    },
+
     // Pull the latest state from Nostr; apply it if it's newer than what we have.
     // Returns true if state was applied (so the caller can skip a full scan).
     async syncFromNostr() {