{
  "manageEntity": {
    "action": "Save",
    "entityId": "1551240630",
    "entityType": "Track",
    "nonce": "0x51e8c8282f078bd1721ffdfa9a17cebde5a240fc1398536991ec7b5c36e4ddf8",
    "signature": "0x650f43eb0c7923cce7e5717dfbb5f377a1deb2d2164be242c4702693bb7416305ff0a25b64822bc7ffed339a498e72393f733f2b45098096c9e457111aafca671b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}