{
  "manageEntity": {
    "action": "Save",
    "entityId": "1574762715",
    "entityType": "Track",
    "nonce": "0x0862d7e91332925534097e63d58114de834e114da64c8c087f0c892ba2f14f26",
    "signature": "0x8376db7feff006e2cf8490d78867781d0281f08121caaf079b594914984e2c3835199f66500b19071066f82df0321a4ae0c9ccc8f4a019eeb362ba40f71c312e1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}