{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://raw.githubusercontent.com/api-evangelist/flow-blockchain/main/json-schema/block.json",
  "title": "Block",
  "description": "A Flow blockchain block containing a header, payload, and execution result.",
  "type": "object",
  "required": ["header", "block_status"],
  "properties": {
    "header": {
      "$ref": "#/definitions/BlockHeader"
    },
    "payload": {
      "$ref": "#/definitions/BlockPayload"
    },
    "execution_result": {
      "$ref": "#/definitions/ExecutionResult"
    },
    "block_status": {
      "type": "string",
      "description": "The status of the block.",
      "enum": ["BLOCK_UNKNOWN", "BLOCK_FINALIZED", "BLOCK_SEALED"]
    },
    "_links": {
      "type": "object",
      "properties": {
        "_self": { "type": "string" }
      }
    }
  },
  "definitions": {
    "Identifier": {
      "description": "A 32-byte unique identifier for an entity.",
      "type": "string",
      "format": "hexadecimal",
      "pattern": "[a-fA-F0-9]{64}"
    },
    "Signature": {
      "description": "A variable length signature.",
      "type": "string",
      "format": "byte"
    },
    "BlockHeader": {
      "type": "object",
      "required": ["id", "parent_id", "height", "timestamp", "parent_voter_signature"],
      "properties": {
        "id": { "$ref": "#/definitions/Identifier" },
        "parent_id": { "$ref": "#/definitions/Identifier" },
        "height": { "type": "string", "format": "uint64" },
        "timestamp": { "type": "string", "format": "date-time" },
        "parent_voter_signature": { "$ref": "#/definitions/Signature" }
      }
    },
    "CollectionGuarantee": {
      "type": "object",
      "required": ["collection_id", "signer_ids", "signature", "reference_block_id", "cluster_chain_id"],
      "properties": {
        "collection_id": { "$ref": "#/definitions/Identifier" },
        "signer_ids": {
          "type": "array",
          "items": { "$ref": "#/definitions/Identifier" },
          "minItems": 1,
          "uniqueItems": true
        },
        "signature": { "$ref": "#/definitions/Signature" },
        "reference_block_id": { "$ref": "#/definitions/Identifier" },
        "cluster_chain_id": { "type": "string" }
      }
    },
    "BlockSeal": {
      "type": "object",
      "required": ["block_id", "result_id", "final_state", "aggregated_approval_signatures"],
      "properties": {
        "block_id": { "$ref": "#/definitions/Identifier" },
        "result_id": { "$ref": "#/definitions/Identifier" },
        "final_state": {
          "description": "The root hash of the state tree.",
          "type": "string",
          "format": "hexadecimal",
          "pattern": "[a-fA-F0-9]{64}"
        },
        "aggregated_approval_signatures": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["verifier_signatures", "signer_ids"],
            "properties": {
              "verifier_signatures": {
                "type": "array",
                "items": { "$ref": "#/definitions/Signature" },
                "minItems": 1,
                "uniqueItems": true
              },
              "signer_ids": {
                "type": "array",
                "items": { "$ref": "#/definitions/Identifier" },
                "minItems": 1,
                "uniqueItems": true
              }
            }
          },
          "minItems": 1,
          "uniqueItems": true
        }
      }
    },
    "BlockPayload": {
      "type": "object",
      "required": ["collection_guarantees", "block_seals"],
      "properties": {
        "collection_guarantees": {
          "type": "array",
          "items": { "$ref": "#/definitions/CollectionGuarantee" },
          "uniqueItems": true
        },
        "block_seals": {
          "type": "array",
          "items": { "$ref": "#/definitions/BlockSeal" },
          "uniqueItems": true
        }
      }
    },
    "Event": {
      "type": "object",
      "required": ["type", "transaction_id", "transaction_index", "event_index", "payload"],
      "properties": {
        "type": { "type": "string", "description": "The qualified event type." },
        "transaction_id": { "$ref": "#/definitions/Identifier" },
        "transaction_index": { "type": "string", "format": "uint64" },
        "event_index": { "type": "string", "format": "uint64" },
        "payload": { "type": "string", "format": "byte" }
      }
    },
    "Chunk": {
      "type": "object",
      "required": ["block_id", "collection_index", "start_state", "end_state", "event_collection", "index", "number_of_transactions", "total_computation_used"],
      "properties": {
        "block_id": { "$ref": "#/definitions/Identifier" },
        "collection_index": { "type": "string", "format": "uint64" },
        "start_state": { "type": "string", "format": "byte" },
        "end_state": { "type": "string", "format": "byte" },
        "event_collection": { "type": "string", "format": "byte" },
        "index": { "type": "string", "format": "uint64" },
        "number_of_transactions": { "type": "string", "format": "uint64" },
        "total_computation_used": { "type": "string", "format": "uint64" }
      }
    },
    "ExecutionResult": {
      "type": "object",
      "required": ["id", "block_id", "events", "previous_result_id"],
      "properties": {
        "id": { "$ref": "#/definitions/Identifier" },
        "block_id": { "$ref": "#/definitions/Identifier" },
        "events": {
          "type": "array",
          "items": { "$ref": "#/definitions/Event" }
        },
        "chunks": {
          "type": "array",
          "items": { "$ref": "#/definitions/Chunk" }
        },
        "previous_result_id": { "$ref": "#/definitions/Identifier" }
      }
    }
  }
}