{
  "manageEntity": {
    "action": "Save",
    "entityId": "1748463561",
    "entityType": "Track",
    "nonce": "0xc890faef593a79cf185f70bf8ee0f073f5f11d3a48e0c14627a4a4731817ec12",
    "signature": "0x9a80c509f6768946938f808dcfbcd30acb42c5c1f736879368ded2c82c6d82706c7935d601df9cf57d19f1c8d1d12ab4cb8f901c87a8dcc474310918812d71e81b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}