{
  "manageEntity": {
    "action": "Save",
    "entityId": "399104486",
    "entityType": "Track",
    "nonce": "0xa66e21cef95759f901227ba79e3f0bbcfab0772143fcba18b0ded96198132938",
    "signature": "0x5b4d0a362dd05acfbf97f48e9eb04b7e6e4bc6cc5baa690e62a60c5158947f152631b33b98554ba2d4ce79185354bbdb8c31268fd889ac54533b3da093598e301b",
    "signer": "0x4D8EDeF47b57f98c89BDFf851267B0327BE4cD05",
    "userId": "5307724"
  }
}