zaps: publish preimage-verified tallies on successful zap (#47)

Third slice of docs/zap-tally-plan.md §5.3-5.5 — the publish side:

- zapSplit.js: surface receipt.preimage (NWC pay_invoice result.preimage).
- zapController.js: onZapSuccess now forwards per-share proof
  {recipientType, amountSats, bolt11, preimage, zapRequest} for every settled
  share with a preimage.
- zapTallyPublisher.js (new): buildTallyFromShare (pure — builds the addressable
  tally from a share's bolt11/preimage/zap-request, d=payment_hash, pointers
  from the zap request) + publishZapTallies (best-effort, flag-gated, never
  throws).
- ModalManager.js: onZapSuccess keeps the instant optimistic bump AND publishes
  the tallies via nostrClient.signAndPublishEvent to write relays (an
  all-timeout publish is a soft success per #49). A publish failure is
  non-fatal — the durable local ledger still shows the sender their zap.

With the counting slice (025ab348), a sent zap now: shows instantly (ledger),
publishes a verified tally, and every bitvid client counts it — surviving the
recipient never publishing a 9735. Tests: tests/zap-tally-publisher.test.mjs
(5). Lint + build green.

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

js/payments/zapSplit.js

@@ -486,6 +486,15 @@ async function processShare({
       metadata,
       invoice,
       payment,
+      // Proof of settlement from NWC pay_invoice (result.preimage), surfaced so
+      // the caller can publish a preimage-verified bitvid zap tally
+      // (docs/zap-tally-plan.md §5.3). null when the wallet returns none.
+      preimage:
+        (payment && typeof payment === "object" && payment.result &&
+          typeof payment.result.preimage === "string" &&
+          payment.result.preimage.trim())
+          ? payment.result.preimage.trim()
+          : null,
       zapRequest,
       status: "success",
     };

js/payments/zapTallyPublisher.js

@@ -0,0 +1,87 @@
+// js/payments/zapTallyPublisher.js
+//
+// Publishes bitvid-native zap tallies (kind ZAP_TALLY_KIND) after a successful
+// zap, so the zapped video/profile's total is global + durable even when the
+// recipient's LNURL server never publishes a NIP-57 9735 receipt
+// (docs/zap-tally-plan.md §5.4-5.5). Each settled share (creator + platform)
+// carries its own invoice/preimage, so each becomes one payer-signed,
+// preimage-verified tally. Best-effort: a publish failure never affects the
+// payment UX (the sats already moved).
+
+import { buildZapTallyEvent } from "../nostrEventSchemas.js";
+import { extractBolt11Fields } from "./zapReceiptValidator.js";
+import { devLogger, userLogger } from "../utils/logger.js";
+
+const tagFromReq = (req, name) => {
+  const tags = Array.isArray(req?.tags) ? req.tags : [];
+  const tag = tags.find((t) => Array.isArray(t) && t[0] === name && t[1] != null);
+  return tag ? String(tag[1]) : "";
+};
+
+// Pure: build the unsigned tally event for one settled zap share, or null when
+// it can't be made verifiable (no decodable payment_hash / missing proof).
+export function buildTallyFromShare({ share, pubkey, now = () => Math.floor(Date.now() / 1000) } = {}) {
+  if (!share || typeof share !== "object" || !pubkey) {
+    return null;
+  }
+  const bolt11 = typeof share.bolt11 === "string" ? share.bolt11.trim() : "";
+  const preimage = typeof share.preimage === "string" ? share.preimage.trim() : "";
+  const zapRequestJson =
+    typeof share.zapRequest === "string" ? share.zapRequest.trim() : "";
+  if (!bolt11 || !preimage || !zapRequestJson) {
+    return null;
+  }
+
+  const { paymentHash } = extractBolt11Fields(bolt11);
+  if (!paymentHash) {
+    return null; // needs payment_hash for the `d` tag + verification
+  }
+
+  let req = null;
+  try {
+    req = JSON.parse(zapRequestJson);
+  } catch (error) {
+    return null;
+  }
+
+  const amountSats = Math.max(0, Math.round(Number(share.amountSats) || 0));
+
+  return buildZapTallyEvent({
+    pubkey,
+    created_at: now(),
+    paymentHash,
+    recipientPubkey: tagFromReq(req, "p"),
+    eventId: tagFromReq(req, "e"),
+    coordinate: tagFromReq(req, "a"),
+    amountMsats: amountSats > 0 ? amountSats * 1000 : undefined,
+    bolt11,
+    preimage,
+    zapRequestJson,
+  });
+}
+
+// Publish a tally per settled share. `publish(event)` signs + broadcasts (best
+// effort); `enabled` gates the whole thing (FEATURE_ZAP_TALLY). Never throws.
+export async function publishZapTallies({ shares, pubkey, publish, enabled = true, now } = {}) {
+  if (!enabled || typeof publish !== "function" || !pubkey) {
+    return { published: 0 };
+  }
+  const list = Array.isArray(shares) ? shares : [];
+  let published = 0;
+  for (const share of list) {
+    const event = buildTallyFromShare({ share, pubkey, now });
+    if (!event) {
+      continue;
+    }
+    try {
+      await publish(event);
+      published += 1;
+      devLogger.log("[zapTally] Published tally for a settled share.");
+    } catch (error) {
+      // The payment already succeeded; a failed tally publish is non-fatal —
+      // the durable local ledger still shows the zap to the sender.
+      userLogger.warn("[zapTally] Failed to publish zap tally:", error);
+    }
+  }
+  return { published };
+}

js/ui/ModalManager.js

@@ -14,6 +14,8 @@ import initDeleteModal from "./initDeleteModal.js";
 import { EventDetailsModal } from "./components/EventDetailsModal.js";
 import ZapController from "./zapController.js";
 import { ingestLocalVideoZap } from "../zapTotals.js";
+import { publishZapTallies } from "../payments/zapTallyPublisher.js";
+import { FEATURE_ZAP_TALLY } from "../constants.js";
 import { nostrClient } from "../nostrClientFacade.js";
 
 export default class ModalManager {
@@ -272,9 +274,12 @@ export default class ModalManager {
       callbacks: {
         onSuccess: (message) => app.showSuccess(message),
         onError: (message) => app.showError(message),
-        // Optimistically bump the zapped video's total using the SAME pointer
+        // (1) Optimistically bump the zapped video's total using the SAME
-        // the cards/modal badge subscribe with, so the badge updates instantly.
+        // pointer the cards/modal badge subscribe with (instant), and
-        onZapSuccess: ({ video, sats } = {}) => {
+        // (2) publish preimage-verified bitvid zap tallies so the total is
+        // global + durable even if the recipient never publishes a 9735
+        // (docs/zap-tally-plan.md §5.5). Both best-effort.
+        onZapSuccess: ({ video, sats, shares } = {}) => {
           try {
             const info =
               video && typeof app.deriveVideoPointerInfo === "function"
@@ -286,6 +291,24 @@ export default class ModalManager {
           } catch (error) {
             /* best-effort optimistic update */
           }
+          if (FEATURE_ZAP_TALLY && Array.isArray(shares) && shares.length) {
+            publishZapTallies({
+              shares,
+              pubkey: app.pubkey,
+              enabled: FEATURE_ZAP_TALLY,
+              publish: (event) =>
+                nostrClient.signAndPublishEvent(event, {
+                  context: "zap tally",
+                  logName: "Zap tally",
+                  devLogLabel: "zap tally",
+                  rejectionLogLevel: "warn",
+                  resolveActiveSigner: (p) =>
+                    nostrClient.signerManager.resolveActiveSigner(p),
+                }),
+            }).catch(() => {
+              /* non-fatal: the payment already succeeded */
+            });
+          }
         },
       },
       requestWalletPane: () => app.openWalletPane(),

js/ui/zapController.js

@@ -384,11 +384,32 @@ export default class ZapController {
       // Optimistically bump the video's zap total by the amount sent (both the
       // creator and platform shares are tagged to the video, so the eventual
       // relay total equals context.shares.total). Badge updates instantly.
+      // Also forward the per-share proof (bolt11 + preimage + zap request) so
+      // the app can publish preimage-verified bitvid zap tallies
+      // (docs/zap-tally-plan.md §5.4). Only settled shares with a preimage.
       if (this.callbacks.onZapSuccess) {
         try {
+          const shares = receipts
+            .filter(
+              (r) =>
+                r &&
+                (r.status === "success" || !r.status) &&
+                typeof r.preimage === "string" &&
+                r.preimage,
+            )
+            .map((r) => ({
+              recipientType: r.recipientType || "creator",
+              amountSats: Math.max(0, Math.round(Number(r.amount) || 0)),
+              bolt11:
+                typeof r.invoice?.invoice === "string" ? r.invoice.invoice : "",
+              preimage: r.preimage,
+              zapRequest: typeof r.zapRequest === "string" ? r.zapRequest : "",
+            }))
+            .filter((s) => s.bolt11 && s.zapRequest && s.amountSats > 0);
           this.callbacks.onZapSuccess({
             video: this.getCurrentVideo(),
             sats: Math.max(0, Math.round(Number(context?.shares?.total) || 0)),
+            shares,
           });
         } catch (error) {
           userLogger.warn("[zap] onZapSuccess hook failed:", error);

tests/zap-tally-publisher.test.mjs

@@ -0,0 +1,129 @@
+// Publishing side of the bitvid zap tally (docs/zap-tally-plan.md §5.4-5.5):
+// each settled zap share becomes one payer-signed tally, built from its own
+// invoice/preimage/zap-request. Best-effort — a publish failure must not throw.
+//
+// test_integrity_note:
+//   change_type: ["new_tests"]
+//   scenarios:
+//     - id: SCN-zap-tally-publish
+//       given: "settled zap shares (with/without a decodable bolt11 or preimage) and an injected publisher"
+//       when: "buildTallyFromShare / publishZapTallies run"
+//       then: "a verifiable tally is built + published per settleable share; unpublishable shares are skipped; a publish throw is swallowed; disabled → nothing published"
+//   observable_outcomes:
+//     - "built event kind/tags (d=payment_hash, p/e/a, bolt11, preimage, description)"
+//     - "published count; publish() called once per settleable share"
+//   determinism_controls:
+//     - "in-test bech32 bolt11 vector; injected publish(); no network"
+//   anti_cheat_rationale:
+//     prevents: ["over-mocking internal logic", "hard-coded return value"]
+//   relaxation:
+//     did_relax_any_assertion: false
+
+import test from "node:test";
+import { strict as assert } from "node:assert";
+import { bech32 } from "../vendor/crypto-helpers.bundle.min.js";
+import {
+  buildTallyFromShare,
+  publishZapTallies,
+} from "../js/payments/zapTallyPublisher.js";
+import { ZAP_TALLY_KIND } from "../js/nostrEventSchemas.js";
+
+const PUB = "a".repeat(64);
+const CREATOR = "b".repeat(64);
+const EVENT_ID = "e".repeat(64);
+const COORD = `30078:${CREATOR}:vid-1`;
+
+// Minimal valid bolt11 carrying a known payment_hash (bech32 'p' field = code 1).
+const lenWords = (n) => [n >> 5, n & 31];
+function makeBolt11(paymentHashBytes) {
+  const pWords = bech32.toWords(paymentHashBytes);
+  const words = [
+    0, 0, 0, 0, 0, 0, 0,
+    1, ...lenWords(pWords.length), ...pWords,
+    ...new Array(104).fill(0),
+  ];
+  return bech32.encode("lnbc", words, 2000);
+}
+const BOLT11 = makeBolt11(new Uint8Array(32).fill(0x11));
+
+const zapRequestJson = JSON.stringify({
+  kind: 9734,
+  pubkey: PUB,
+  tags: [
+    ["p", CREATOR],
+    ["e", EVENT_ID],
+    ["a", COORD],
+    ["amount", "2100000"],
+  ],
+  content: "",
+});
+
+const goodShare = {
+  recipientType: "creator",
+  amountSats: 2100,
+  bolt11: BOLT11,
+  preimage: "cd".repeat(32),
+  zapRequest: zapRequestJson,
+};
+
+test("buildTallyFromShare: builds an addressable, proof-carrying tally", () => {
+  const event = buildTallyFromShare({ share: goodShare, pubkey: PUB, now: () => 1000 });
+  assert.ok(event);
+  assert.equal(event.kind, ZAP_TALLY_KIND);
+  const tag = (n) => event.tags.find((t) => t[0] === n);
+  assert.equal(tag("d")[1], "11".repeat(32), "d = payment_hash from the bolt11");
+  assert.deepEqual(tag("p"), ["p", CREATOR]);
+  assert.deepEqual(tag("e"), ["e", EVENT_ID]);
+  assert.deepEqual(tag("a"), ["a", COORD]);
+  assert.equal(tag("bolt11")[1], BOLT11);
+  assert.equal(tag("preimage")[1], "cd".repeat(32));
+  assert.ok(tag("description"), "embeds the zap request");
+});
+
+test("buildTallyFromShare: skips shares that can't be made verifiable", () => {
+  assert.equal(buildTallyFromShare({ share: { ...goodShare, preimage: "" }, pubkey: PUB }), null);
+  assert.equal(buildTallyFromShare({ share: { ...goodShare, bolt11: "not-bolt11" }, pubkey: PUB }), null, "undecodable bolt11 → no payment_hash");
+  assert.equal(buildTallyFromShare({ share: { ...goodShare, zapRequest: "" }, pubkey: PUB }), null);
+  assert.equal(buildTallyFromShare({ share: goodShare, pubkey: "" }), null);
+});
+
+test("publishZapTallies: one publish per settleable share; unpublishable skipped", async () => {
+  const published = [];
+  const result = await publishZapTallies({
+    shares: [goodShare, { ...goodShare, preimage: "" }, { ...goodShare, amountSats: 42 }],
+    pubkey: PUB,
+    enabled: true,
+    publish: async (event) => {
+      published.push(event);
+    },
+  });
+  assert.equal(result.published, 2, "two settleable shares published, the no-preimage one skipped");
+  assert.equal(published.length, 2);
+  assert.ok(published.every((e) => e.kind === ZAP_TALLY_KIND));
+});
+
+test("publishZapTallies: a publish failure is swallowed (payment already settled)", async () => {
+  const result = await publishZapTallies({
+    shares: [goodShare],
+    pubkey: PUB,
+    enabled: true,
+    publish: async () => {
+      throw new Error("relay down");
+    },
+  });
+  assert.equal(result.published, 0, "no throw; count reflects the failure");
+});
+
+test("publishZapTallies: disabled → nothing published", async () => {
+  let calls = 0;
+  const result = await publishZapTallies({
+    shares: [goodShare],
+    pubkey: PUB,
+    enabled: false,
+    publish: async () => {
+      calls += 1;
+    },
+  });
+  assert.equal(result.published, 0);
+  assert.equal(calls, 0);
+});