{
  "manageEntity": {
    "action": "Save",
    "entityId": "147876738",
    "entityType": "Track",
    "nonce": "0x0062a6e30d6d568d5989f014f1989b859fd4ea10d2f8887127d91c3782a86669",
    "signature": "0x629790aa62f67fac75a995e1d0f9f7b52f53d8a7f377b47dd21b543792ac3c435906a7e7dc61ee6d4bbe3ba5a63291fbcafed000a781913839e796ac84e99d551b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}