{
  "manageEntity": {
    "action": "Save",
    "entityId": "543428350",
    "entityType": "Track",
    "nonce": "0xd30955ece8703ec664527650f30b5133ea19477c2e650d5df6f9d340a6340c3b",
    "signature": "0x9ece0b80cf2d1a01cd70b914a60bd1c297ff5257e9564230a0841b381c1179d75dbccb8ca21d788417a0e71603d243fc2ed7459c414c9dd74b61dc402c6740fe1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}