{
  "manageEntity": {
    "action": "Save",
    "entityId": "1489760539",
    "entityType": "Track",
    "nonce": "0x17e2c06780c4d143cab17b717613553bdba5c6977635f757f1f51aaf67e3fe33",
    "signature": "0xc9ace5cc0e76ad3f52ea37c0b1cd2e2b69c4ea796885d4aab57c5b4ed456a0995139ed3907cb9ef88fbdc71734260a7f7757d0a35866b7d6488e2d289f2b46ea1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}