{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/SignRequest",
  "title": "SignRequest",
  "type": "object",
  "properties": {
    "accountId": {
      "type": "string",
      "description": "Account identifier for the credential"
    },
    "challenge": {
      "type": "string",
      "format": "byte",
      "description": "Base64-encoded challenge buffer to sign"
    }
  },
  "required": [
    "accountId",
    "challenge"
  ]
}