{
  "manageEntity": {
    "action": "Save",
    "entityId": "1286476334",
    "entityType": "Track",
    "nonce": "0x8fd647c408bc967388e0e7448473f53d440416b09d1200ca5b2fe3106e33c65a",
    "signature": "0x904d237355cd0328c97f605da053ebf499d80598155454cdfba3750f0f1e7c972f5a637d229bb540666a9b42ef261765b6824cbc7c7751d1682c222c681874571c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}