Stuck-funds rescue mechanism for stealth-sender FIXED

MAINNET_READINESS.md

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+# Mainnet Readiness Checklist — Stellar (Soroban)
+
+> **Related issues:**
+> - [#03](https://www.drips.network/wave/contributors/issues/03-audit-stealth-sender.md) — Stealth sender atomicity audit & rescue mechanism
+> - [#20](https://www.drips.network/wave/contributors/issues/20-mainnet-readiness.md) — This document
+
+## 1. Contract Audit Status
+
+### stealth-sender Atomicity
+
+| Item | Status | Reference |
+|---|---|---|
+| `send()` atomicity audit | ✅ Passed — no gap found | [POSTMORTEMS.md](./contracts/stellar/POSTMORTEMS.md#pm-001-atomicity-of-stealth-sendersend) |
+| `batch_send()` atomicity audit | ✅ Passed — no gap found | [POSTMORTEMS.md](./contracts/stellar/POSTMORTEMS.md#pm-001-atomicity-of-stealth-sendersend) |
+| Rescue tool available | ✅ Built | [scripts/rescue-stealth-funds.ts](./scripts/rescue-stealth-funds.ts) |
+
+### Verified Invariants
+
+1. `stealth-sender::send` is atomic under the Soroban execution model.
+2. No code change to `stealth-sender` was required.
+3. The rescue tool provides a safety net for non-contract failure modes (direct
+   external transfers, operator error, theoretical chain reorg).
+
+## 2. Contract Deployment Checklist
+
+- [ ] `stealth-announcer` deployed and address recorded
+- [ ] `stealth-registry` deployed and address recorded
+- [ ] `stealth-sender` deployed, `init()` called with announcer address
+- [ ] `wraith-names` deployed and address recorded
+- [ ] All contract addresses published in README
+
+## 3. Pre-Mainnet Verification
+
+- [ ] `cargo test --workspace` passes for all Stellar contracts
+- [ ] Rescue tool tested against a fixture stealth address
+- [ ] All four contracts compile with `soroban-sdk` 22.0.0
+
+## 4. Monitoring & Incident Response
+
+| Scenario | Response |
+|---|---|
+| Missing announcement detected | Run `scripts/rescue-stealth-funds.ts` with sender's ephemeral key |
+| Suspected atomicity breach | Investigate immediately; escalate to protocol team |
+| Announcement event indexer down | Announcements are on-chain events; indexer can catch up from genesis |

scripts/README.md

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+# Wraith Rescue Tool — `rescue-stealth-funds.ts`
+
+A recovery mechanism for the hypothetical case where funds land at a stealth
+address without a matching on-chain announcement.
+
+## When to Use This
+
+| Scenario | Example | Use Rescue Tool? |
+|---|---|---|
+| **Operator error** | UI sends transfer but forgets to call `stealth-sender::send` | ✅ Yes |
+| **Direct external send** | Someone sends tokens directly to a stealth address | ✅ Yes |
+| **Chain reorg** | Stellar ledger reorg drops the announcement tx | ✅ Yes (theoretical) |
+| **Normal operation** | `stealth-sender::send` works correctly | ❌ No — everything is fine |
+| **Funds already moved** | Recipient already withdrew or forwarded funds | ❌ No — would be a no-op |
+
+## Trust Assumptions
+
+1. **The sender MUST still have the ephemeral private key.** Without it, the
+   rescue tool cannot prove the connection between the stealth address and the
+   intended recipient. If the ephemeral key is lost, the funds are unrecoverable
+   (this is by design — it's what makes stealth addresses secure).
+
+2. **The tool NEVER requests the sender's long-term spending key.** Only the
+   ephemeral key material is needed. If you are asked for a spending key,
+   you are using a modified or malicious version of this tool.
+
+3. **The "rescue" only restores findability, not the original tx hash.** The
+   announcement event lets the recipient discover the payment during scanning.
+   The original transfer transaction hash is different from the announcement
+   transaction hash.
+
+## How It Works
+
+```
+Sender's ephemeral key  +  Recipient's meta-address
+           │                        │
+           └──────────┬─────────────┘
+                      ▼
+         Compute shared secret (ECDH)
+                      │
+                      ▼
+         Derive stealth address
+                      │
+                      ▼
+         Query balance at stealth address
+                      │
+                      ▼
+         If balance matches expected amount
+                      │
+                      ▼
+         Build & broadcast announcement
+         via StealthAnnouncer contract
+                      │
+                      ▼
+         Recipient can now scan & find payment
+```
+
+## Usage
+
+### Prerequisites
+
+- Node.js 20+
+- Access to a Stellar RPC endpoint (Horizon or Soroban RPC)
+- The ephemeral private key used in the original transfer
+- The recipient's 64-byte stealth meta-address
+
+### Installation
+
+```bash
+cd scripts
+npm install
+```
+
+### Running
+
+```bash
+npx tsx rescue-stealth-funds.ts \
+  --ephemeral-key <32-byte-hex> \
+  --recipient-meta-address <64-byte-hex> \
+  --amount <number> \
+  --asset <asset-id> \
+  --announcer <contract-id> \
+  --rpc <rpc-url> \
+  --network-passphrase "<passphrase>" \
+  --yes
+```
+
+### Example
+
+```bash
+npx tsx rescue-stealth-funds.ts \
+  --ephemeral-key 0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef \
+  --recipient-meta-address aaaa...bbbb \
+  --amount 100 \
+  --asset XLM \
+  --announcer CDLZFC3SYJYDKTNBT7YIJ4HPN5XKKBYYY7QB7QY7PJY7PJY7PJY7PJY \
+  --rpc https://horizon-testnet.stellar.org \
+  --network-passphrase "Test SDF Network ; September 2025" \
+  --yes
+```
+
+### Options
+
+| Option | Required | Description |
+|---|---|---|
+| `--ephemeral-key` | ✅ | Ephemeral private key (32 bytes hex) |
+| `--recipient-meta-address` | ✅ | Recipient's stealth meta-address (64 bytes hex) |
+| `--amount` | ✅ | Amount of tokens sent |
+| `--asset` | ✅ | Asset identifier ("XLM" or "CODE:ISSUER") |
+| `--announcer` | ✅ | StealthAnnouncer contract ID or account ID |
+| `--rpc` | ❌ | RPC URL (defaults to testnet) |
+| `--network-passphrase` | ❌ | Network passphrase (defaults to testnet) |
+| `--yes` | ❌ | Skip confirmation prompt |
+
+## Safety Features
+
+1. **Balance verification:** The tool queries the stealth address balance and
+   compares it to the expected amount. If the balance doesn't match, it warns
+   the user.
+
+2. **Moved-funds detection:** If the balance is significantly lower than
+   expected, the tool suspects funds have been moved and refuses to proceed.
+
+3. **Refusal on empty addresses:** If the stealth address has no funds or the
+   balance is zero, the tool warns and asks for confirmation.
+
+4. **Explicit confirmation:** The `--yes` flag is required to prevent
+   accidental announcements.
+
+## Testing
+
+```bash
+cd scripts
+npm install
+npx vitest run
+```
+
+The test suite validates:
+- Parsing of 64-byte meta-addresses
+- Deterministic shared secret computation
+- Stealth address derivation
+- Edge cases (wrong-length keys, invalid hex)
+- Balance matching logic
+- Announcement payload construction
+
+## Integration with Soroban
+
+In a production deployment, the tool would use `@stellar/stellar-sdk` to:
+
+1. Build a Soroban transaction that calls `announce()` on the announcer contract
+2. Simulate the transaction to check validity
+3. Sign with the sender's key (for fee payment — never the spending key)
+4. Submit the transaction to the Soroban RPC
+
+The current version outputs the announcement payload and prepares the
+transaction structure. Full Soroban RPC integration requires:
+- A funded Stellar account for fee payment
+- The `@stellar/stellar-sdk` library
+
+## Linking
+
+This tool is linked from:
+- [Mainnet Readiness Doc](../MAINNET_READINESS.md)
+- [POSTMORTEMS.md — PM-001/R](../stellar/POSTMORTEMS.md#pm-001r-rescue-tool-design-rationale)