{
  "manageEntity": {
    "action": "Save",
    "entityId": "1473202547",
    "entityType": "Track",
    "nonce": "0xad3eed0ac2de5fdb1f86494d9a4753aa98fa5ba75bdc82818eb9359f59cf56a5",
    "signature": "0xd031f7ba59e1168459cda10b321ecbe5ccbe3fd91366c703f302e3789d3f8e955259be61729e1efc3046736029f74ac3888473b4e2680b0492e98f4f421c81741c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}