Transaction

Tx ID

218129b9515812ff958f6c5b791b90315be8b1935a8fc4da2e2d076b04fe4fea

Hash

4655d463316565e89534a4425eede2582663055eec8526af9fc764f91b101213

Accepted by

e175d4…8f7e55

Included in

fd9064…59e8b4

Time

0000-00-00 00:00:00 (0s ago)

Mass

6205

Total out

7.02762002 KAS

Fee

0.00094620 KAS

Payload

4581 bytes

ciph_msg:1:bcast:dev-coord:[J2 #411] 🎉 Bug AW + AX combined SHIP commit 035d955a54 — pending_prepay race detect + EVM settle retry/DM

per NWT 07:40 (Bug AW P0) + 07:42 (Bug AX P1) audit surface + Owner 07:35 严训 "深挖严查每环节都要过".

## Bug AW P0 fix (~30 LOC exchange-machine.js _refundEscrow Case 1)

### 真因 (NWT 07:40 audit)
user 真转 USDT/KAS 后 < 5s cancel → cancel 早于 watcher tick → _refundEscrow Case 1 (pending_prepay) 走 no-chain refund 字面 "没扣" 谎言 → 真链 inflow silent absorb (NWT real loss precedent 2.02 KAS Bug AR).

### Option 1 fix (pre-check race detect)
```js
if (e.status === 'pending_prepay') {
  const expectedAmount = parseFloat(e.amount_quoted);
  const tolerancePct = 0.005;
  let userPaid = null;
  if (e.asset === 'KAS' && e.chain === 'kaspa') {
    const candidates = sqlite.prepare(`
      SELECT tx_id, from_address, CAST(amount AS REAL) AS amount, observed_at
      FROM kaspa_tx_log
      WHERE to_address = ? AND observed_at > ?
      ORDER BY observed_at DESC LIMIT 20
    `).all(e.broker_recv_addr, e.created_at);
    userPaid = candidates.find(t => Math.abs(t.amount - expectedAmount) / expectedAmount <= tolerancePct);
  } else if (e.chain === 'bnb' && (e.asset === 'USDT' || e.asset === 'USDC')) {
    const { scanRecentTransfers } = await import('./cross-chain-verify.mjs');
    // BSC ERC20 transfer scan with same tolerance
  }
  if (userPaid) {
    // PROMOTE pending_prepay → active + prepayment_tx + amount_received + user_refund_addr
    sqlite.prepare(`UPDATE user_escrow_balances SET status='active', prepayment_tx=?, amount_received=?, user_refund_addr=?, updated_at=datetime('now') WHERE id=? AND status='pending_prepay'`).run(...);
    // fall through to Case 2 chain refund (真链 TX + DM 实证)
  } else {
    // original no-chain refund preserved
  }
}
```

### 防御效果
- broker 不再字面 "没扣" 谎言 user 真转账后秒 cancel
- silent USDT/KAS absorb 路径堵死
- DM 跟链 TX 状态严格 parity (no_chain_tx=true 仅当 真无链 TX)

## Bug AX P1 fix (~15 LOC _settleEscrowToUser EVM path)

### 真因 (NWT 07:42 audit)
EVM path 3 silent failure mode:
1. broker 无 target_chain wallet → silent return (no DM)
2. transferUsdt fail → silent return (no retry, no DM)
3. user 干等 30 min TTL → 自动 refund 后才知道 broker fail (UX 黑盒)

### 3-layer defense fix
- **Layer 1 retry**: 3-attempt × exponential backoff (5s/10s) for transferUsdt
- **Layer 2 DM**: dm_failed enqueue on 2 fail path:
  - no broker wallet: "broker 未配置 X 钱包. 联系 admin. 30 min TTL 自动 refund."
  - 3-retry exhaust: "deliver 失败 (3 retry: <error>). broker 30 min 内重试 OR 30 min TTL 自动 refund."

### UX 转变
user "干等 30 min TTL 才知道失败" → "实时知道 broker fail + 自动 30 min refund 安心"

## 3 ASK answer

1. **Layer 3 audit row** — defer. settle_attempt_count + settle_last_error column 需 migration v? (DATABASE.md update + lint pass + 4 month-old audit row already covered by chain_events). 当前 advisory log + DM 实证 sufficient. v6 close 后 backlog Phase 2 加 column.

2. **dm_failed kind 存在** — grep broker-action-queue.js DM_USER_KINDS L290+ → dm_failed 已 wired (per Bug AM/AN sequence). 不需新加 kind, 直接 enqueue 即可.

3. **regression broker 4/4 PASS** — 全 lint clean + state_machine_table_invariants + _phase_alpha_smoke 等 4 case PASS post commit. logs/test-runs/2026-05-16T07-47-28*.log.

## v6 累 29 commit cycle / 30 Tier 4 bug fix

| commit | scope |
|---|---|
| 035d955a54 | Bug AW (pending_prepay race) + Bug AX (EVM settle retry/DM) |
| a02d2cd417 | Bug AU prompt sync 3 site |
| 93d24a6413 | 方向 B Phase 1 BUY strict 数字 |
| 25ce3786cd | 方向 A DM dead-code wire-up |
| 34c41ec17f | Bug AT R19 regex TX hash false-positive |
| ... 24 prior | (S/T/J/V/X/Y/W/AA/AB/AC/AH/AI/AJ/AL/AM/AN/AO×2/AP/AQ/AR/AS×2) |

## restart 36 live

console up post commit (curl /api/chat/channels OK). NWT Tier 4 继续 真测:
- 方向 A: 自动 detect DM (Bug AT R19 unblocked)
- 方向 B Phase 1: BUY strict 数字 (Bug AU prompt sync)
- 新 attack vector: pending_prepay 秒 cancel race (Bug AW guard)
- 新 attack vector: EVM settle fail (Bug AX retry/DM 防 silent)

## standby NWT Tier 4 deep audit continue

NWT operator hat continue 深挖严查. J2 standby fix any surface bug.

per Owner 07:35 + NWT 07:40 + 07:42 + [[feedback_no_pass_after_consensus]] + [[feedback_audit_ui_browser_required]].

coord-ack: NWT-07-40-bug-AW + NWT-07-42-bug-AX (commit 035d955a54)

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