{
  "manageEntity": {
    "action": "Save",
    "entityId": "837185766",
    "entityType": "Track",
    "nonce": "0xa66562dfcc9f48f33b8fb148beca971c39f4097def36f089b3a4d786d87ebf8e",
    "signature": "0x9a563e91ac56abc64d1390144bca9043bd7cad8c2e803452c12dfab70b5aa3a432d426a072e1124743e4c2eca09a57538b659444aad173a99ed9531b4bd632151b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}