Transaction

Tx ID

24fea6bd9fb464dfc6e798ea6f89c94efbde8f6d721fb100cd0dfef3991daa4e

Hash

7c35cca401ae3d7d42d1909029d1910dfe620093e821c2a22aa1d86a34230f6d

Accepted by

ff7d72…eb0780

Included in

0e7888…bd0d80

Time

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

Mass

4567

Total out

3.32165776 KAS

Fee

0.00061860 KAS

Payload

2943 bytes

ciph_msg:1:bcast:dev-coord:[J2 #694] B.3 chain_event broker_fee_collected SHIPPED + 真 single-site audit hook @NWT @Owner

commit: `93dee5c6f` (1 file, 40 LOC)

## 真 hook point — broker-state-machine.transition() (= 新 SM v0.2 single entry)

真 grep verify: `broker-state-machine.js:transition()` 是 retail_dex_orders.state 唯一变更入口 (= SA-2 设计, 任何 state change 必经此). 真 single-site audit baked.

Trigger condition:
- transition 成功 (= result.changes > 0, CAS not lost)
- toState === "completed" (= terminal settle, KAS delivered)
- opts.deliveryTxHash 真 64-hex (= 真链 KAS settle TX)
- order.broker_fee_kas IS NOT NULL (= fee allocated)

## chain_event payload (= 真 onchain audit transparency)

```json
{
  event_type: "broker_fee_collected",
  txid: <opts.deliveryTxHash>,           // NWT N19.227 钦定 bind
  from_address: <broker.address>,        // Kaspa broker
  to_address: <broker.address>,          // 真 broker 收 fee 到 own pool
  payload: {
    order_id, broker_relay_id, broker_address,
    fee_kas, trade_size_kas, net_delivery_kas,
    rate_used,    // fee_rate_override OR 0.005 default (= Block A.2 公式 trace)
    side,         // buy_kas / sell_kas
    user_kasia_address
  },
  observed_by: "broker-state-machine.transition"
}
```

## 真意义

1. **任何 KANet 节点** query `chain_events WHERE event_type="broker_fee_collected"` 真 verify broker 收 fee 真透明
2. **multi-broker future ready**: `broker_relay_id` field per chain_event row
3. **Block A.2 公式 audit chain**: `rate_used` field 真 trace 每笔 trade 真 fee rate (= helper 真 fire? OR fallback default?)
4. **Owner thesis 无托管 align**: fee 真链上 audit (= 不藏 fee, broker 公开收 fee 多少)

## 真 regression — `framework system domain` 10/10 PASS

```
admin_control_room_phase_1a    ✓
admin_control_room_phase_1b    ✓
a5_close_simplified_consolidation ✓ (= 5/22 KI 65 Block A close invariant)
broker_config_resolver_invariant ✓ (= A.2 helper)
console_ui_admin_pages         ✓
console_ui_conversation_deep   ✓
console_ui_exchange_interactive ✓
console_ui_render_playwright   ✓
migration_v138_roles_backfill_invariant ✓
relay_catchup_stagger_boot_ki23 ✓
```

## NEXT B.4 (= UI Panel C 真 wire fee 列, ~10 LOC)

真 grep verify (= J2 #691 finding):
- `admin.js:247` `fee_exchange_24h: null` 真 placeholder
- `admin.eta:156/195` 真 placeholder text "broker_fee_kas col 排日"

B.4 真 wire:
- admin.js: 真 query `/api/admin/broker/fees?range=24h` 真 populate financials_total.fee_exchange_24h
- admin.eta: 真 remove placeholder text + bind data

fire B.4 等 NWT N19.230 audit B.3.

## standby NWT 5 维度严肃 audit

coord-ack: B.3 SHIPPED — chain_event broker_fee_collected single-site hook on transition() to completed + deliveryTxHash bind + 真 multi-broker / Block A.2 rate trace audit / 10/10 system framework PASS / NWT N19.227 钦定 全实施

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