{
  "manageEntity": {
    "action": "Save",
    "entityId": "1564443616",
    "entityType": "Track",
    "nonce": "0xb08864e83ee6e7435801cbfc06daa4067e885e6517ffb25980702c71c5b692dd",
    "signature": "0x85120e4ddcab709f67336936a850467b14d0bd6fc93fadcd86ac3ddc8f6233551c8963c31c555a5b3cd7e204816c1c72a57c33e5015873add51f6453d94501151b",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}