[FEAT] Cross-Ledger Settlement Time-Lock Atomic Swap Dispute Bridge (#446)

[s6pa1rta3n-lab]

Summary of Changes

Resolves #446 by implementing a production-grade Cross-Ledger Settlement Time-Lock Atomic Swap Dispute Bridge for EVM <-> Stellar cross-chain trades.

1. Database & Schema Migration:

   • Added apps/api/src/db/migrations/029_add_atomic_swap_dispute_bridge.sql with swap_dispute_state enum (ACTIVE, SECRET_EXTRACTED, REFUND_CLAIMABLE, RESOLVED) and atomic_swap_dispute_bridges table with indexing.

2. Core Worker & Store Architecture:

   • Implemented apps/api/src/lib/workers/swapDisputeWorker.ts with SwapDisputeStore.
   • Dual-side secret extraction: cryptographically verifies SHA-256 revealed secret preimages from counterparty ledger and safely triggers cross-chain settlement.
   • Concurrency protection: implements PostgreSQL pessimistic locking (SELECT FOR UPDATE) and mutexes to eliminate race conditions and double-spending across parallel invocations.
   • Background worker: automated sweeping of expired swaps (sweepExpiredSwaps) for automated dispute resolution and refund execution.

3. API & REST Routes:

   • Added apps/api/src/routes/swap-dispute.ts registering endpoints:
     • POST /api/v1/swaps/register-dispute
     • POST /api/v1/swaps/extract-secret
     • POST /api/v1/swaps/dispute-claim
     • GET /api/v1/swaps/dispute/:swapId

4. Smart Contract Enhancements:

   • Extended contracts/atomic-swap/src/lib.rs with extract_secret_and_resolve and claim_dispute_refund ensuring atomic dispute resolution and refund releases upon counterparty timeout.
   • Added unit tests in contracts/atomic-swap/src/test.rs.

5. Frontend UI Component:

   • Implemented mobile/frontend/src/components/AtomicSwapDisputeCard.tsx displaying real-time lock status, countdown, secret extraction triggers, and one-click dispute refund claiming when expiration threshold is breached.

6. Webhooks & Operations Alerts:

   • Added sendSwapDisputeAlert, sendSwapSecretExtractedAlert, and sendSwapDisputeRefundAlert in apps/api/src/lib/webhook.ts.

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Stipulations Compliance Checklist

• Dual-Side Secret Extraction: Cryptographically verifies sha256(preimage) == secret_hash and updates state to SECRET_EXTRACTED.
• Automated Timeout Dispute Refund Claim: Verifies current_ledger >= expiration_ledger before refund execution, returning funds safely to initiator/buyer.
• Pessimistic Concurrency Locking: Employs SELECT FOR UPDATE and transactional mutexes to eliminate double claim races under concurrent load.
• Webhooks & Monitoring Alerts: Dispatches operational webhooks on dispute registration, secret extraction, and refund triggers.
• Soroban Contract Invariants: Enforces CEI pattern and non-bypassable timeout checks in AtomicSwapContract.
• 50-Request Concurrency Stress Test: Validated under 50 simultaneous extractions and 20-racer timeout refund claims with 0 duplicate executions (tests/concurrency/swap_dispute_stress.test.ts).
• All Test Suites Passing: 100% test pass rate across Rust contracts (atomic-swap) and TypeScript packages (@velo/api, @velo/frontend, @velo/relayer, @velo/shared).

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Payout Routing

• EVM (Base/Arbitrum/Polygon/ETH): 0xF46C9F6d70C50BF81ef3588AB523a90a594a2F89
• Stellar: GCL6OXAMLD75BMTINA6EMRUDWK5THQUSHMYNLSNBCJAPZJHNYJTUNIBC

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Project	Deployment	Actions	Updated (UTC)
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[jotel-dev]

Hey @s6pa1rta3n-lab, saw this is still in draft — no rush, just flagging that it currently has conflicts across 9 files including app.ts, the locale files, and stellar.ts. Given the number of other PRs merging around the same shared files recently, it might be worth rebasing on the latest main periodically while you work, so the conflict doesn't grow further. Let me know when it's ready for review! @s6pa1rta3n-lab