{
  "manageEntity": {
    "action": "Save",
    "entityId": "524903409",
    "entityType": "Track",
    "nonce": "0x631952fa3c711568268cb594ff93fdc9f4de732f1da3d6b65719ea7a482e8fe1",
    "signature": "0xda93ef7b588327823f41ade51377cdcdc314891c0baf2d4b91e49c8feccadf1d75ac99bfe81a1893bfc2a948d1631a0d26e81520b5834469c5778854bfaa7a211c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}