{
  "manageEntity": {
    "action": "Save",
    "entityId": "903673025",
    "entityType": "Track",
    "nonce": "0xb912911ad00201d1791d0e42febdaa22cfe11937110ec40ad785fdf89957a441",
    "signature": "0x52b4eb006e8563a7ea6bc83ea69838918d4e650000855fae66de1fd68d8a85437bb49417024efe2e01aea1f598c050c76ea77e4120d778454eebdf1c4135413d1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}