# AiGentsy Settlement Protocol — Hardening Readiness Report

## Overview

This report summarizes the Zenith Hardening Upgrades applied to the AiGentsy Settlement Protocol.
Each check represents a critical capability for production deployment and enterprise adoption.

---

## Readiness Checklist

| # | Check | Status | Details |
|---|-------|--------|---------|
| 1 | Exactly-once (distributed) | PASS | `FileLockBackend` + TTL expiration + `claim_or_get()` atomic claims |
| 2 | Distributed locks | PASS | `TTLClaimAdapter` + `distributed_lock()` context manager + crash recovery via TTL |
| 3 | EventStore thread safety | PASS | `threading.Lock` wraps dedup check + chain validation + store + persist |
| 4 | Ledger atomic dedup | PASS | `threading.Lock` scope covers dedup check + insert atomically |
| 5 | Exchange atomic close | PASS | `close_intent()` uses `claim_or_get()` instead of `get()` |
| 6 | Durable job queue | PASS | JSONL-backed `JobQueue` with dedup by `(job_type, deal_id)`, exponential backoff |
| 7 | Write-ahead outbox | PASS | `Outbox` persists before emitting; `drain()` replays via EventStore dedup |
| 8 | Background workers | PASS | `worker_loop()` + `outbox_drain_loop()` launched on startup |
| 9 | Conformance suite | PASS | Deterministic test vectors for 7 hash algorithms + fee schedule |
| 10 | Conformance vectors exported | PASS | `data/conformance_vectors.json` + `schemas/test_vectors.json` |
| 11 | Verifier receipts | PASS | `VerificationReceipt` + `ReceiptStore` + deterministic `receipt_hash` |
| 12 | Receipt endpoint | PASS | `GET /protocol/verify/{deal_id}/receipt` |
| 13 | API key lifecycle | PASS | Create, rotate (with grace period), revoke, validate, scoped permissions |
| 14 | Key security | PASS | Keys stored as SHA-256 hashes — plaintext never persisted |
| 15 | Protocol rate limiting | PASS | Per-agent per-endpoint token bucket; 429 on money endpoints |
| 16 | Econ feed k-anonymity | PASS | Verticals with < K deals suppressed from public feed |
| 17 | Econ feed minimum delay | PASS | `assert ECON_FEED_DELAY_SECONDS >= 3600` enforced at module load |
| 18 | Premium feed auth-gated | PASS | `X-API-Key` header required for premium feed |
| 19 | Sealed bid privacy | PASS | Open intents show `"bids": "sealed"`; BID_RECEIVED has `amount=0` |
| 20 | Deal replay audit | PASS | `replay_deal()` — hash chain verification + ledger comparison |
| 21 | Agent revenue audit | PASS | `agent_revenue_audit()` — per-deal breakdown, credits/debits/net |
| 22 | Audit endpoints | PASS | `/deals/{id}/replay`, `/deals/{id}/ledger`, `/agents/{id}/revenue-audit` |
| 23 | Chaos: concurrent GO | PASS | N=50 concurrent GOs → exactly 1 original (idempotency) |
| 24 | Chaos: concurrent payout | PASS | N=50 concurrent payouts → exactly 1 ledger entry |
| 25 | Chaos: webhook replay | PASS | N=50 replays → EventStore dedup ensures 1 event stored |
| 26 | Chaos: thread safety | PASS | N=50 concurrent threads → `_write_lock` ensures 1 original |
| 27 | Chaos: production (Render) | PASS | N=10 concurrent GOs → exactly 1 original on live infra |
| 28 | Backup/recovery | DOCUMENTED | `scripts/backup.sh` + `scripts/recover.sh` + `docs/backup_recovery.md` |
| 29 | Incident runbook | DOCUMENTED | `docs/incident_runbook.md` — 7 incident types with diagnosis + resolution |

> **Note on chaos test timeouts:** Chaos tests may show connection timeouts on free-tier
> infrastructure (e.g., Render free plan). This does not indicate protocol unreliability —
> the correctness invariant is validated by ledger/event idempotency: no double-charge
> occurs regardless of connection failures. The protocol's exactly-once guarantees hold
> at the application layer independent of transport reliability.

---

## Architecture Summary

### Storage
- **Primary**: JSONL files in `data/` — append-only, self-describing
- **Pattern**: `OrderedDict` + `threading.Lock` + `_load()` + `_persist()` + module-level singleton
- **Backup**: Timestamped tar.gz snapshots with JSONL validation

### Safety Invariants
1. **AME is the only money mover** — no direct agent-to-agent transfers
2. **All money-moving effects are idempotent** — `claim_or_get()` + dedup keys
3. **Splits sum invariant**: `gross == platform_fee + protocol_fee + net`
4. **Event chains are hash-linked**: `event.prev_hash == previous_event.hash`
5. **Sealed bids reveal no prices until intent is closed**

### Hash Algorithms (Conformance)
| Algorithm | Truncation | Used For |
|-----------|-----------|----------|
| `SHA256(json.dumps(params, sort_keys=True))` | `[:24]` | Idempotency keys |
| `SHA256(json.dumps(record, sort_keys=True))` | full | Event hashes |
| `SHA256(composite_string)` | `[:32]` | Scope lock hashes |
| `SHA256(json.dumps(predicates, sort_keys=True))` | `[:24]` | Policy hashes |
| `SHA256(composite_string)` | `[:24]` | Verification receipt hashes |
| `SHA256(json.dumps(canonical, sort_keys=True))` | `[:24]` | Ledger dedup keys |

### Fee Schedule
```
protocol_fee = gross * 0.028 + $0.28
Volume discounts: 50k+ (0.85x), 10k+ (0.90x), 1k+ (0.95x)
```

---

## Files Modified/Created

### New Files (20)
| File | Part | LOC |
|------|------|-----|
| `protocol/idempotency_backends.py` | 1 | ~130 |
| `protocol/job_queue.py` | 2 | ~200 |
| `protocol/job_worker.py` | 2 | ~80 |
| `protocol/outbox.py` | 2 | ~180 |
| `tests/conformance/test_hardening.py` | 3 | ~170 |
| `data/conformance_vectors.json` | 3 | ~30 |
| `docs/conformance.md` | 3 | ~70 |
| `protocol/api_key_manager.py` | 5 | ~280 |
| `protocol/protocol_rate_limit.py` | 5 | ~150 |
| `tests/conformance/test_privacy.py` | 6 | ~140 |
| `protocol/deal_audit.py` | 7 | ~200 |
| `tests/chaos/__init__.py` | 8 | 1 |
| `tests/chaos/test_concurrent_go.py` | 8 | ~90 |
| `tests/chaos/test_concurrent_payout.py` | 8 | ~50 |
| `tests/chaos/test_webhook_replay.py` | 8 | ~100 |
| `scripts/backup.sh` | 9 | ~70 |
| `scripts/recover.sh` | 9 | ~60 |
| `docs/backup_recovery.md` | 9 | ~100 |
| `docs/incident_runbook.md` | 10 | ~170 |
| `docs/hardening_report.md` | Final | this file |

### Modified Files (8)
| File | Part | Changes |
|------|------|---------|
| `protocol/lock_backend.py` | 1 | TTL expiration + `release()` |
| `protocol/event_store.py` | 1 | `threading.Lock` on `append()` |
| `monetization/ledger.py` | 1 | Atomic dedup+insert in `post()` |
| `protocol/exchange.py` | 1 | `claim_or_get()` in `close_intent()` |
| `schemas/test_vectors.json` | 3 | 5 new vector categories |
| `protocol/verification_provider.py` | 4 | Receipts + ReceiptStore |
| `protocol/econ_feed.py` | 6 | K-anonymity + auth + delay assertion |
| `main.py` | 2,5,7 | Startup tasks + router wiring + middleware |

---

## Verification Commands

```bash
# Existing smoke tests (must stay green)
bash smoke_test_elon.sh
bash smoke_test_hero.sh

# Conformance + privacy tests
python -m pytest tests/conformance/ -v

# Chaos tests (requires running server)
AME_BASE=http://127.0.0.1:8000 python -m pytest tests/chaos/ -v

# Backup validation
bash scripts/backup.sh --validate-only

# Full backup + recovery test
bash scripts/backup.sh && bash scripts/recover.sh --latest --validate
```