{
  "manageEntity": {
    "action": "Save",
    "entityId": "658530",
    "entityType": "Track",
    "nonce": "0xacf9a590f13344a2a3c9a40b72487b6b267d8100d0a00ff665bface4b367b805",
    "signature": "0xe236bae944e5754f47ad2ba722a1c21195c2c963afde36a734088ed991a508702341ded36afe7c1eb77bd1418a7318e5edc9e635dc3bbd58bc738b18180e61cd1b",
    "signer": "0x7425EdbFdF528603A88c658f4cf8B1396a8a77F5",
    "userId": "406225571"
  }
}