{
  "manageEntity": {
    "action": "Save",
    "entityId": "16754",
    "entityType": "Track",
    "nonce": "0x1c4ee4cea597d913f1c53b7f8cfed863d261fc9f0b125d6667536ad3505e32ec",
    "signature": "0x80c04d4191eb767c5e729181ba9a02d5100e54c8fffdb09b01e7974934058a763c92f92e3a71494231fa498a18851cd4a14bd9c0a84069a76ad82e51d3738a8f1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}