{
  "manageEntity": {
    "action": "Save",
    "entityId": "449657",
    "entityType": "Track",
    "nonce": "0xca5f5e2e5cd2d4a71831fdf8a244a59b815383a6c3e9596614178d1774b73add",
    "signature": "0xcb2bd86d926e6475b29ec9716f9efb2dd9c2c231080fda49482069cfdf134af13bdc2296914f6832677c4d023966915fc815ac165ef373d6ca8c7c6c7822ba5a1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}