{
  "manageEntity": {
    "action": "Save",
    "entityId": "629061",
    "entityType": "Track",
    "nonce": "0xf4cbf905be6d9d9252dbbfbd60edf13e40fd04cbae49c50192e5af9e1eec6201",
    "signature": "0x83e4eb4005e67fc47e84fda0def09d15a0567ed38eb9115f603e9e6aa65e774f56fdeb96f73e654a6470ae280cffad9163616cfcd829e6d3c6bf9140988dcb3b1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}