{
  "manageEntity": {
    "action": "Save",
    "entityId": "656752583",
    "entityType": "Track",
    "nonce": "0xffa4c3f937a3ded2d23e2a08db6fb148f20544d5bf4670875357ef12138a6279",
    "signature": "0xcf7458e48cc5336b4b494e5c3abd6fc013a629013938a8ccd5c4099fdef6c77f26f84a83b9cdd999e11d7c6ce48f38eb29ce8913d11eca98e4fdaae1a43c2e141b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}