{
  "manageEntity": {
    "action": "Save",
    "entityId": "305022347",
    "entityType": "Track",
    "nonce": "0x495d0de30df9db6fe3e0483d21bd116373b2c2a4cb4f95d1c45b24131628436f",
    "signature": "0x42ea7358e0c9d7e9e4485834f90b1c48b95b2ca4d269ffcfcd3319491c9ca1510db8dae1248c455f7d492cc226ead8081bd2d8c51f7bf01bc0c3060608d112b31c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}