{
  "manageEntity": {
    "action": "Save",
    "entityId": "357603",
    "entityType": "Track",
    "nonce": "0xc5eb6b6135dbc1412ae6598587f7e00b77bd618dc44810524b2355e534552d74",
    "signature": "0x982c80ff2fba62defb9d8a3c5dbe58331c935cf1339924c14209a3dfcc9158490cdc2f3d92ee47eb0b96f00e30d7ee2e645d2809e2814a4c4894878064909cc31c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}