{
  "manageEntity": {
    "action": "Save",
    "entityId": "667483",
    "entityType": "Track",
    "nonce": "0x9938fbc53639cb9b7c955744e641311f529d7a57b64e065ed3c8694764683ab8",
    "signature": "0xcf09c01ac7cacccef4ad72a203d5536bc8da27f385de55f6555b35e381b03654075a8047f8e046f2c1654b20bf0b1abbb287fa8c33ca44eb4c6f05aa21281e821c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}