{
  "manageEntity": {
    "action": "Save",
    "entityId": "1403098700",
    "entityType": "Track",
    "nonce": "0xe75429695fa77cba13e5610995078984fcff0149166c72c9087a65dee7d8505e",
    "signature": "0x7a4aefcca587d7d0914746b5a653af4b6c167a451f13f50b348edfd8978065aa17ef694a40e2c6e89945e03e26cd03af961802e15c841b636e6056728da481791b",
    "signer": "0xa5cf2A0b67A9F8aE59B937369F6404d7Fe103c07",
    "userId": "641892598"
  }
}