{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://receiptprotocol.com/open-receipt/v0.1/issuer.schema.json",
  "title": "Open Receipt issuer metadata v0.1",
  "type": "object",
  "additionalProperties": false,
  "required": ["issuer", "specification", "keys"],
  "properties": {
    "issuer": { "type": "string", "format": "uri" },
    "specification": { "const": "https://receiptprotocol.com/open-receipt" },
    "keys": {
      "type": "array",
      "minItems": 1,
      "items": {
        "type": "object",
        "additionalProperties": false,
        "required": ["kty", "crv", "x", "kid", "use", "alg", "status"],
        "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" },
          "status": { "enum": ["current", "historical", "revoked"] },
          "valid_from": { "type": "string", "format": "date-time" },
          "valid_until": { "type": ["string", "null"], "format": "date-time" }
        }
      }
    }
  }
}