{
  "manageEntity": {
    "action": "Save",
    "entityId": "628774",
    "entityType": "Track",
    "nonce": "0x895db15a202c18b7f0a43147bbc552f5076d5ba6d7a74ae78e87a5153d2c7ae0",
    "signature": "0x5626594d265bd13eb7f74c490599c8c9ca3518d8d17ade2c38ef540de0dc44425639099fab38fc1029d3e751acf9eea2ff6c03fb3ece854dff435067cbed03ff1b",
    "signer": "0x0a5148A3f132E6696c1Cd3FDA8465fC5fF17d3D2",
    "userId": "803288761"
  }
}