{
  "manageEntity": {
    "action": "Save",
    "entityId": "294352898",
    "entityType": "Track",
    "nonce": "0x343ecb30af1bf96781e4f05ab1f44eddb8d58a69f8d375bb6ff2519892641ce4",
    "signature": "0xcf45c17eb3a1092e5ca8a7368e6e6a1d8b46692689433fad1fcc343a3af4bb142843c7098b92b53f178917be536a65a53651098f9cb5c2ae80c3b6239b9e58741c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}