{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://receiptprotocol.com/open-receipt/v0.2/issuer-metadata.schema.json",
  "title": "Open Receipt issuer metadata v0.2",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "schema",
    "issuer",
    "metadata_version",
    "issued_at",
    "next_update",
    "previous_metadata_hash",
    "keys",
    "signature"
  ],
  "properties": {
    "schema": {
      "const": "https://receiptprotocol.com/open-receipt/v0.2/issuer-metadata.schema.json"
    },
    "issuer": { "type": "string", "format": "uri", "pattern": "^https://" },
    "metadata_version": { "type": "integer", "minimum": 1 },
    "issued_at": { "type": "string", "format": "date-time" },
    "next_update": { "type": "string", "format": "date-time" },
    "previous_metadata_hash": {
      "oneOf": [{ "type": "null" }, { "type": "string", "pattern": "^sha256:[a-f0-9]{64}$" }]
    },
    "keys": {
      "type": "array",
      "items": { "$ref": "#/$defs/key" }
    },
    "signature": { "$ref": "#/$defs/signature" }
  },
  "$defs": {
    "publicJwk": {
      "type": "object",
      "additionalProperties": false,
      "required": ["kty", "crv", "x", "kid"],
      "properties": {
        "kty": { "const": "OKP" },
        "crv": { "const": "Ed25519" },
        "x": { "type": "string", "pattern": "^[A-Za-z0-9_-]{43}$" },
        "kid": { "type": "string", "minLength": 1 },
        "use": { "const": "sig" },
        "alg": { "const": "EdDSA" }
      }
    },
    "key": {
      "type": "object",
      "additionalProperties": false,
      "required": [
        "kid",
        "purpose",
        "alg",
        "public_jwk",
        "status",
        "valid_from",
        "valid_until",
        "activated_at",
        "retired_at",
        "revoked_at",
        "revocation_effective_from",
        "compromised_at",
        "compromise_effective_from",
        "destroyed_at",
        "replaced_by_kid",
        "reason_code"
      ],
      "properties": {
        "kid": { "type": "string", "minLength": 1 },
        "purpose": {
          "enum": ["open_receipt_evidence", "issuer_metadata", "issuance_log"]
        },
        "alg": { "const": "EdDSA" },
        "public_jwk": { "$ref": "#/$defs/publicJwk" },
        "status": {
          "enum": ["preactive", "active", "retired", "revoked", "compromised", "destroyed"]
        },
        "valid_from": { "type": "string", "format": "date-time" },
        "valid_until": { "type": ["string", "null"], "format": "date-time" },
        "activated_at": { "type": ["string", "null"], "format": "date-time" },
        "retired_at": { "type": ["string", "null"], "format": "date-time" },
        "revoked_at": { "type": ["string", "null"], "format": "date-time" },
        "revocation_effective_from": { "type": ["string", "null"], "format": "date-time" },
        "compromised_at": { "type": ["string", "null"], "format": "date-time" },
        "compromise_effective_from": { "type": ["string", "null"], "format": "date-time" },
        "destroyed_at": { "type": ["string", "null"], "format": "date-time" },
        "replaced_by_kid": { "type": ["string", "null"] },
        "replacement_kid": {
          "type": ["string", "null"],
          "description": "Accepted alias for replaced_by_kid; canonical issuers emit replaced_by_kid."
        },
        "reason_code": { "type": ["string", "null"] }
      }
    },
    "signature": {
      "type": "object",
      "additionalProperties": false,
      "required": ["kid", "alg", "value"],
      "properties": {
        "kid": { "type": "string", "minLength": 1 },
        "alg": { "const": "EdDSA" },
        "value": { "type": "string", "pattern": "^[A-Za-z0-9_-]+$" }
      }
    }
  }
}