{
  "manageEntity": {
    "action": "Save",
    "entityId": "203440847",
    "entityType": "Track",
    "nonce": "0x986314efa2c0969e07af41b1637a0bdf9b29ec0b8cf8349b5bfc5bbc60e059b8",
    "signature": "0xef28e004e9d6a289aec9441674b480a6a7ac0926e4459e29c5708e4baeb7bce72a111ee48079390ba66bb85ac2a376748f6b81a4de15ca7d057623248573cc2d1c",
    "signer": "0xca797dA7dCB793742623d55EA81fb92A9566B550",
    "userId": "363062902"
  }
}