{
  "manageEntity": {
    "action": "Save",
    "entityId": "321372",
    "entityType": "Track",
    "nonce": "0xaf4bb6082edb4a098df65393bceff320f10603d2311d002035f97a638ed78f7d",
    "signature": "0xd8d35f404439641ee7b003e07ab3d2b66e3baccc952dfa491c0400fa794ba97d5bfd58021aaffbd2cbfb828603b27782791e64733593218f586bb58c0f1d91ca1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}