{
  "manageEntity": {
    "action": "Save",
    "entityId": "1240368419",
    "entityType": "Track",
    "nonce": "0x321ec835238ac119d0bf8e2969dfacf225738969e49e39511e92a96c9ea56a5e",
    "signature": "0xdd79989258b0cfd96d2bea012a476b6af8903a69c9de400901423c7af81e702f50698249384c9c69c085745b0bb1defdfcc5bad3be2bad3314c4fda3ad667e1b1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}