{
  "manageEntity": {
    "action": "Save",
    "entityId": "1112442",
    "entityType": "Track",
    "nonce": "0x4640ced44ff3ac85a5cc2b7b3949b5a59b264fd4719aa0c897d373352826de8b",
    "signature": "0x340a13581e7719db56a7c4f075928a41d553d6d088f214401901bda7a4110f9953a2f9966ebfb765be013ec207f2b77d4be1c30e0f8d0e7ad80344021a9c59551c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}