{
  "manageEntity": {
    "action": "Save",
    "entityId": "1512494309",
    "entityType": "Track",
    "nonce": "0xd38514624c24ff1c8c8e3cb5774eb1468cc95dffe6e76685c7a1cf7607809118",
    "signature": "0xa2d87bb496be95ba3f93e3121a6cfef5cdf7d520499f6fc4ec23a54893109b262b66f64b379979f854eeee2c1ca474ba9b2b5b86910a495d8996928a436377571c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}