{
  "manageEntity": {
    "action": "Save",
    "entityId": "787309919",
    "entityType": "Track",
    "nonce": "0xea75369103b961217d32c736d76fac7e7b7f2fb2cc70dc1562381a1b8456062c",
    "signature": "0x975a0a5f6d01c7c6888fde833aa4248750617f92962156282a959b0d4702c4157bc05be8baafcd6b4a0cfc4077f33a385f64a2ed125ccdb1fe116b774f95d05e1c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}