{
  "manageEntity": {
    "action": "Save",
    "entityId": "1046448900",
    "entityType": "Track",
    "nonce": "0x1243b5458abf765df5c3e7455043061935ac083f745e4132982259b087d8ff00",
    "signature": "0xc700b2406c26b782f66de23a055633cd85e5b2a01792fedefe078c9575146a9446321661355417382e1847f280d64a279cbc1144f8e2a4728cfc530ea06e13b71b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}