Cross-Chain Settlement Flow

Overview

Cross-chain settlement enables atomic swaps across multiple ledger types (sovereign, CBDC, commodity, security token chains). This flow documents the complete process from commitment creation through atomic swap execution.

Prerequisites

Source and destination chains are registered
Valid cross-chain settlement request
Sufficient balance/position in source chain
Cross-chain contract service operational

Visual Flow Diagram

┌─────────────┐
│ Settlement  │
│  Request    │
└──────┬──────┘
       │
       │ 1. Create Settlement Record
       ▼
┌─────────────────────────┐
│ Create Settlement Record│
│  - Settlement ID         │
│  - Chain types & IDs     │
│  - Amount & asset type   │
└──────┬──────────────────┘
       │
       │ 2. Create Commitments
       ▼
┌─────────────────────────┐
│ Create Cross-Chain      │
│  Commitments             │
│  - Source commitment     │
│  - Target commitment     │
└──────┬──────────────────┘
       │
       │ 3. Execute Atomic Swap
       ▼
┌─────────────────────────┐
│ Execute Atomic Swap     │
│  - Verify commitments    │
│  - Execute on both chains│
│  - Verify success        │
└──────┬──────────────────┘
       │
       │ 4. Update Status
       ▼
┌─────────────┐
│ Settlement  │
│  Complete   │
└─────────────┘

Step-by-Step Process

Step 1: Create Settlement Record

Receive cross-chain settlement request
Generate settlement ID: CCS-{uuid}
Create settlement record with source/target chain details
Set status: pending

Code Reference: src/core/settlement/cross-chain/cross-chain-settlement.service.ts:29-48

Step 2: Create Commitments

Create commitments for both chains
Store commitment hashes
Link to settlement record

Code Reference: src/core/settlement/cross-chain/cross-chain-settlement.service.ts:85-124

Step 3: Execute Atomic Swap

Call cross-chain contract service
Verify both commitments
Execute swap on both chains atomically
Verify execution success

Code Reference: src/core/settlement/cross-chain/cross-chain-contract.service.ts

Step 4: Update Status

If successful: Set status settled
If failed: Set status failed
Record completion timestamp

Code Reference: src/core/settlement/cross-chain/cross-chain-settlement.service.ts:60-79

Error Handling

Commitment creation failure: Rollback, return error
Atomic swap failure: Rollback both chains, mark failed
Verification failure: Mark failed, create reconciliation record

Integration Points

Cross-Chain Settlement Service: src/core/settlement/cross-chain/cross-chain-settlement.service.ts
Cross-Chain Contract Service: src/core/settlement/cross-chain/cross-chain-contract.service.ts
Atomic Settlement Service: src/core/settlement/isn/atomic-settlement.service.ts

Performance Metrics

Total End-to-End: < 200ms target
Throughput: 5,000+ settlements/second

Security Considerations

Atomic execution ensures both chains update or neither
Commitment verification prevents tampering
Hash verification ensures integrity

Related Flows:

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