{
  "manageEntity": {
    "action": "Save",
    "entityId": "921067348",
    "entityType": "Track",
    "nonce": "0x6572132890bf5b51388fea45abdc20d43d4508990c165e55eeaf200e9937089c",
    "signature": "0x19baf0410babfc1bf9bed0b4653291f3eb03c9fd950d79c27e455db094ce9a89365c3873762092883af2fe2f593b3b12aae9abd0db15c32a71fcc4f5664e76f51b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}