{
  "manageEntity": {
    "action": "Save",
    "entityId": "820449666",
    "entityType": "Track",
    "nonce": "0xa4e6a8148301bba0a168502bad589a5d6b6dbb76fc4ce1a06f58c729b94b4d02",
    "signature": "0xde15a07284c712676ca98079866aa2bbc243365b6ff39e05affa05e11623beaa2b5619f5cd46970c4354e97804cdbad4ab2c4400fd66543171f93f68540534861b",
    "signer": "0xAAB9cff3D43A1b095421916d4C7D864d657286c7",
    "userId": "435031315"
  }
}