{
  "handle": "Ledger",
  "mechanism": "An immutable record of {{value}} transfers, debts, and obligations between {{agent}}s, serving as the shared memory for economic coordination. Because entries are never edited, a wrong entry is corrected by appending an offsetting entry rather than by revision — the error and its correction both remain visible, which is the property an audit depends on.",
  "gloss": "Immutable transactional history",
  "invariants": [
    "Immutability: Past entries cannot be modified.",
    "Append-Only: New transactions are added to the end."
  ],
  "_meta": {
    "ring": 0,
    "tier": 1,
    "supersedes": [
      "sema:Ledger#mh:SHA-256:c363289733cce70a458481259762ae79a0419da4ed5c15ad942c4873181ba910",
      "sema:Ledger#mh:SHA-256:bc308b35d2c0be6d4a9159ebe2b3c4989e559628145ba9fccb970d8ec2264b04",
      "sema:Ledger#mh:SHA-256:625250939255c79bdf29aa6a7b455f0e339f63fd45dcc4222e765005a1db1c28"
    ],
    "path": [
      "Infrastructure",
      "Data Structures"
    ]
  },
  "sema_id": "sema:Ledger#mh:SHA-256:4ddaf2792fd7283ceea0d6b9b01ddfff9b7274dfb1cea2bf23147c21520774e5",
  "sema_ref": "Ledger#4dda",
  "sema_stub": "4dda",
  "data_schema": {
    "type": "object",
    "required": [
      "ledger_id",
      "entries"
    ],
    "properties": {
      "ledger_id": {
        "type": "string",
        "description": "Unique identifier"
      },
      "entries": {
        "type": "array",
        "items": {
          "type": "object",
          "properties": {
            "from_agent": {
              "type": "string"
            },
            "to_agent": {
              "type": "string"
            },
            "amount": {
              "type": "number"
            },
            "timestamp": {
              "type": "string",
              "format": "date-time"
            }
          }
        },
        "description": "Immutable transaction history"
      },
      "balance_snapshot": {
        "type": "object",
        "description": "Current balances per agent"
      }
    }
  },
  "dependencies": {
    "references": {
      "agent": "sema:Agent#mh:SHA-256:e127459069739fffc96a71d54ef6e8c97ca53471d5349c16aa72a092a33756cd",
      "value": "sema:Value#mh:SHA-256:37fd75758d04cdd7f57a636ccb5394d463713d60c33b694e37ab71f4a5a896f8"
    }
  },
  "sema_layer": "Infrastructure",
  "sema_category": "Data Structures",
  "used_by": {
    "references": {
      "AuditTrail": "sema:AuditTrail#mh:SHA-256:163b784f86e448340b94d0459483f0f476e052b5b7c589113f5c7df5dd1115a8",
      "Yield": "sema:Yield#mh:SHA-256:336aa68eb26e16b71fc62a16207a842730c80ffa7b8826259d423d86f825fd50"
    },
    "composes_with": {
      "TriGate": "sema:TriGate#mh:SHA-256:04a9a7cc17d29dab76ee781b7d7a3f557f68d528788da12620a320ce53d6b44c"
    }
  }
}