{
      "name": "digital-trade-letter-of-credit",
      "domain": "Digital Trade",
      "title": "Digital Letter-of-Credit Presentation Compliance",
      "description": "W-B. eUCP/eURC/URDTT discrepancy check (ART-54) -> commercial-invoice data validation (art-08) -> cross-document consistency + provenance (ART-55). Machine-checks a digital LC presentation end-to-end.",
      "composer_url": "https://ainumbers.co/chaingraph/chains/digital-trade-letter-of-credit.html",
      "steps": [
        {
          "tool_id": "art-54-digital-trade-rules-checker",
          "handoff": "discrepancies and verdict (H1) feed the invoice validator"
        },
        {
          "tool_id": "art-08-en16931-einvoice-batch-validator",
          "handoff": "invoice validation (H2) feeds the provenance verifier"
        },
        {
          "tool_id": "art-55-trade-document-provenance-verifier",
          "handoff": "Exports composite digital-LC artifact with execution_hash (H3) -- final stage"
        }
      ]
    }