{
  "manageEntity": {
    "action": "Save",
    "entityId": "136879",
    "entityType": "Track",
    "nonce": "0x4971ae00015b03fb748f791e2883daf1ae6379244ebe4a3fa1f376a6c2cf5c3d",
    "signature": "0x75f783a6a3547d9024d1dbc0111f3f39a04a16c87e6940a827fd91a1c06518317c1fc0d0bdff499ba90bdccf9685665f4902a3b242eec51cd464867e9b77e2be1c",
    "signer": "0x7425EdbFdF528603A88c658f4cf8B1396a8a77F5",
    "userId": "406225571"
  }
}