{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://thinkloom.app/schemas/provenance/1.0/ledger-segment-manifest.schema.json",
  "title": "Ledger segment manifest",
  "description": "Immutable seal for one ledger segment.",
  "type": "object",
  "properties": {
    "schema_version": {
      "const": "1.0"
    },
    "project_id": {
      "type": "string",
      "pattern": "^project_[0-9A-HJKMNP-TV-Z]{26}$"
    },
    "segment_number": {
      "type": "integer",
      "minimum": 1
    },
    "previous_segment_file_hash": {
      "anyOf": [
        {
          "type": "string",
          "pattern": "^sha256:[a-f0-9]{64}$"
        },
        {
          "type": "null"
        }
      ]
    },
    "first_event_hash": {
      "type": "string",
      "pattern": "^sha256:[a-f0-9]{64}$"
    },
    "final_event_hash": {
      "type": "string",
      "pattern": "^sha256:[a-f0-9]{64}$"
    },
    "first_event_sequence": {
      "type": "integer",
      "minimum": 1
    },
    "final_event_sequence": {
      "type": "integer",
      "minimum": 1
    },
    "event_count": {
      "type": "integer",
      "minimum": 1
    },
    "byte_length": {
      "type": "integer",
      "minimum": 1
    },
    "segment_file_hash": {
      "type": "string",
      "pattern": "^sha256:[a-f0-9]{64}$"
    },
    "sealed_at": {
      "type": "string",
      "format": "date-time",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}\\.\\d{3}Z$"
    }
  },
  "required": [
    "schema_version",
    "project_id",
    "segment_number",
    "previous_segment_file_hash",
    "first_event_hash",
    "final_event_hash",
    "first_event_sequence",
    "final_event_sequence",
    "event_count",
    "byte_length",
    "segment_file_hash",
    "sealed_at"
  ],
  "additionalProperties": false,
  "examples": [
    {
      "schema_version": "1.0",
      "project_id": "project_01J00000000000000000000001",
      "segment_number": 1,
      "previous_segment_file_hash": null,
      "first_event_hash": "sha256:4444444444444444444444444444444444444444444444444444444444444444",
      "final_event_hash": "sha256:5555555555555555555555555555555555555555555555555555555555555555",
      "first_event_sequence": 1,
      "final_event_sequence": 2,
      "event_count": 2,
      "byte_length": 1024,
      "segment_file_hash": "sha256:6666666666666666666666666666666666666666666666666666666666666666",
      "sealed_at": "2026-07-17T18:42:10.123Z"
    }
  ]
}