{
  "manageEntity": {
    "action": "Save",
    "entityId": "1904978867",
    "entityType": "Track",
    "nonce": "0x71c209135e15b8dc882f28be75263c7a289bf8ec123eff3f02c6d2a774ed3182",
    "signature": "0x906b7dba9120813d5f588cdf7f2b440aef6c218fabd2ccbb3d602f7001a9138111343cf5849871af997d4ba7d68a4f6e03b14ef464ada7fadb720b5e54501f001c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}