{
  "manageEntity": {
    "action": "Save",
    "entityId": "222445",
    "entityType": "Track",
    "nonce": "0x732ec710893c798ffaeb6f6c5a1cb9c7cab1124c56e9ffd0790810fdafa310b9",
    "signature": "0x58ffac843976174f2a6b7ef079b1e41f53b1cfbfda9161750d105ab211383042323fba6006066a2487868233420e6b066e716272f60318fc168e735b226260891c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}