{
  "manageEntity": {
    "action": "Save",
    "entityId": "401202639",
    "entityType": "Track",
    "nonce": "0xe631eff89650ef420a40a662cdd68b1a51e000f317a1105feaafbb53e7acb318",
    "signature": "0x74f0134cf3cfa69706a51ec689cb5b7f885af5126bf606940d96526b17086a830afe4f72645fb4bf81ca4e5113044e0edfda4a45bd67053cec823a2234a47efa1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}