{
  "manageEntity": {
    "action": "Save",
    "entityId": "141607513",
    "entityType": "Track",
    "nonce": "0xb5ed671034facf4881a1fa091699133128077528850dcc7ebcd3c51f2299b984",
    "signature": "0xcb03f672b973f553c003863ceadcbe9d9994d10302d8bb187f26014e4761d18a0965d002920ad68c31f45f607ae6af7b11891bf768b073a2edca6388ce69d3101b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}