{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://campusevidencelab.org/proof-graph/schema.json",
  "title": "CEL ProofGraph",
  "type": "object",
  "required": [
    "schema_version",
    "graph_id",
    "record_id",
    "snapshot_id",
    "snapshot_hash",
    "nodes",
    "edges",
    "graph_root",
    "registry"
  ],
  "properties": {
    "schema_version": {
      "const": "1.0.0"
    },
    "graph_id": {
      "type": "string",
      "pattern": "^proofgraph:"
    },
    "record_id": {
      "type": "string",
      "pattern": "^evt_"
    },
    "snapshot_id": {
      "type": "string"
    },
    "snapshot_hash": {
      "type": "string",
      "pattern": "^sha256:[a-f0-9]{64}$"
    },
    "nodes": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "id",
          "type",
          "label",
          "data",
          "hash"
        ]
      }
    },
    "edges": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "id",
          "type",
          "from",
          "to",
          "hash"
        ]
      }
    },
    "graph_root": {
      "type": "string",
      "pattern": "^sha256:[a-f0-9]{64}$"
    },
    "registry": {
      "type": "object",
      "required": [
        "root",
        "leaf_hash",
        "leaf_index",
        "leaf_count",
        "proof"
      ]
    }
  }
}