Multichain Orchestration Architecture (C4)

Document ID: GOS-80-CHAIN-MULTICHAIN-C4 Version: 0.1.0 Status: DRAFT Owner Role: CHAIN_OFFICER Last Review Date: 2026-03-04 Next Review Date: 2026-04-04

Scope

• Mint execution on external token chain
• Milestone anchoring on Algorand
• Kafka-based orchestration with core-ledger truth boundary

Container View

flowchart LR
  A[Core Ledger Service] -->|Outbox events| B[(Kafka)]
  B --> C[Mint Orchestrator]
  C --> D[Policy Gate]
  D --> E[Mint Executor\nTarget Chain Adapter]
  E --> F[Signer Boundary\nHSM or KMS]
  E --> G[Execution Chain RPC]
  B --> H[Algo Anchor Service]
  H --> I[Algorand Adapter]
  I --> J[Signer Boundary\nHSM or KMS]
  I --> K[Algod\nTestnet or Mainnet]
  C --> L[(Orchestration Store)]
  H --> L
  C --> M[(Audit Hash Chain)]
  H --> M
  B --> N[DLQ Handler]

Component Responsibilities

• Core Ledger Service