{
  "manageEntity": {
    "action": "Save",
    "entityId": "125743868",
    "entityType": "Track",
    "nonce": "0xecb9ea5d372ff2985240086929c49174397c516feb34fb7bd02d6ce5b60bab37",
    "signature": "0xf8bfb99506f65269eb2c3b068ee321f5702dc6b5af33811115b917fddceb0e7215aa70ed4b80eba59b3c7ce8a6496d8395bdfe657c1618b4343ff67d4981bb5d1b",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}