{
  "manageEntity": {
    "action": "Save",
    "entityId": "250870",
    "entityType": "Track",
    "nonce": "0x9924107c8387507a5b799cb6696c132abf25b80a575ac7da102537ddd4331015",
    "signature": "0xf300cc07018efd2aee514c45e21346f82194a8aa4f79530e77be6a9cb6718b3a277bb5ae55b7f59651420280a7fd78d5ffbf4e74d4e098a698a36fa4db74873e1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}