{
  "manageEntity": {
    "action": "Save",
    "entityId": "475768330",
    "entityType": "Track",
    "nonce": "1789571743691816426",
    "signature": "0x49db67264877e615932c0c09ee6a01fe0ae84c565a2d093b2cbb8fb1fd59e0174f1015cc28e1b9c5599478f6f4636c0c4f37ab6eaf960fb3102329c1708c5dd51b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}