Name: Document Integrity & Timestamp Anchor
Author: Post Oak Labs

Chain Stages · 2 Steps

1ROOT · D0node

Document Integrity & eIDAS Electronic Timestamp Anchor art-121

Document hash + timestamp anchor feeds attestation verification

MCP Call · anchor_document_integrity

{
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "name": "anchor_document_integrity",
    "arguments": {
      "document_hash": "sha256:abcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890",
      "claimed_timestamp": "2026-06-25T10:00:00Z",
      "hash_algorithm": "sha256",
      "document_type": "contract"
    }
  },
  "id": 1
}

↓

2TERMINAL · D1node

Timestamp Attestation Verifier art-122

Exports verified timestamp artifact with execution_hash — final stage

MCP Call · verify_timestamp_attestation

{
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "name": "verify_timestamp_attestation",
    "arguments": {
      "document_hash": "sha256:abcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890",
      "presented_anchor": {
        "document_hash": "sha256:abcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890",
        "timestamp_claim": {
          "standard": "eIDAS Art.41 / RFC 3161-aligned",
          "timestamp": "2026-06-25T10:00:00Z",
          "algorithm": "sha256"
        }
      },
      "presented_timestamp": "2026-06-25T10:00:00Z",
      "expected_algorithm": "sha256"
    }
  },
  "id": 2
}