{
  "manageEntity": {
    "action": "Save",
    "entityId": "454999798",
    "entityType": "Track",
    "nonce": "0x65f7e191394a16635b5e7005b95e849620cfa01a49ac95a51752641b74d2a71d",
    "signature": "0xe7d9bfaa435337d80ebe176f97cc99dc80d84a1492b979e43ae1919a72e311f35adfcd8c504c32958811bb08b27fb1a143c61d52427f356b0c716508c2bc74c11c",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}