{
  "manageEntity": {
    "action": "Save",
    "entityId": "740652165",
    "entityType": "Track",
    "nonce": "0x4521c05ed17e114f4d18a943364777d460952c165da6eafe7809262414ed4654",
    "signature": "0x450d9a3e956caa669ec2b51b267af803003e99ea7c03231a77303da7dcef2dc41034f8ef265ae33f72f0cdca1f46eaeb4f613ec1acec9734decbc65611fdd9671b",
    "signer": "0xcdc1772589e70ee6667FAaC93E3F0CcD5BFDa2aE",
    "userId": "354908"
  }
}