{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://x402receipts.com/spec/arr-1/anchor.schema.json",
  "title": "ARR-1 anchor record",
  "description": "A message written to the public ledger. Two record types: a batch anchor (a Merkle root over receipt fingerprints) and a statement anchor (the fingerprint of a period statement). Submitted in canonical form.",
  "type": "object",
  "required": [
    "v",
    "app",
    "workspace"
  ],
  "additionalProperties": true,
  "properties": {
    "v": {
      "const": 1
    },
    "app": {
      "type": "string",
      "description": "Identifier of the issuer, e.g. x402receipts."
    },
    "workspace": {
      "type": "string",
      "description": "Opaque account identifier."
    },
    "batch": {
      "type": "string",
      "description": "Opaque batch identifier."
    },
    "root": {
      "type": "string",
      "pattern": "^[0-9a-f]{64}$",
      "description": "Merkle root of the batch's receipt fingerprints."
    },
    "count": {
      "type": "integer",
      "minimum": 1,
      "description": "How many receipts are in the batch."
    },
    "from": {
      "type": "string",
      "format": "date-time"
    },
    "to": {
      "type": "string",
      "format": "date-time"
    },
    "url": {
      "type": "string",
      "format": "uri",
      "description": "Optional page where the batch can be inspected."
    },
    "type": {
      "enum": [
        "batch",
        "statement"
      ],
      "description": "Absent means batch, for compatibility with records written before this field existed."
    },
    "period": {
      "type": "string",
      "pattern": "^[0-9]{4}-[0-9]{2}$",
      "description": "Statement anchors only."
    },
    "statement": {
      "type": "string",
      "pattern": "^[0-9a-f]{64}$",
      "description": "Statement anchors only: sha256 of the canonical period statement."
    },
    "receipts": {
      "type": "integer",
      "description": "Statement anchors only."
    },
    "unmatched": {
      "type": "integer",
      "description": "Statement anchors only: payments with no receipt in the period."
    },
    "final": {
      "type": "boolean",
      "description": "Statement anchors only."
    }
  },
  "oneOf": [
    {
      "title": "batch anchor",
      "required": [
        "batch",
        "root",
        "count",
        "from",
        "to"
      ]
    },
    {
      "title": "statement anchor",
      "required": [
        "type",
        "period",
        "statement"
      ],
      "properties": {
        "type": {
          "const": "statement"
        }
      }
    }
  ]
}