{
  "manageEntity": {
    "action": "Save",
    "entityId": "258642436",
    "entityType": "Track",
    "nonce": "0x78a4bd586ad6a50116dcd4df54df43146922c9b00b566b5c72b0eaa49a0b8556",
    "signature": "0x389e9907791630460fef7f11652f25d21750b753be0dbcbc3354fc8f74f4dab912692865b061e7c6b94653d4cb88b456536776a9090a2e8aa1dd96f9a63b9b7b1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}