{
  "manageEntity": {
    "action": "Save",
    "entityId": "489574173",
    "entityType": "Track",
    "nonce": "0x701118e29d28376bb07d7e07c66165a420fafbb286722d91067cc7f7c8b47ffc",
    "signature": "0xab1d944b22e827c6e2c97aa7375b6d2ccce6ec2c09d072dfc26017648556d37855a9c83ae57e7ece8ac2536f4be0a63755f5e94fc17df7dcbcf6d2ecdde997461b",
    "signer": "0xa8E11aa224d2579f5cbdb912866bCE84Eb10f9dD",
    "userId": "951616224"
  }
}