{
  "profile": "sidecat.system/0.1",
  "kind": "challenge",
  "serverNonce": "ICEiIyQlJicoKSorLC0uLzAxMjM0NTY3ODk6Ozw9Pj8",
  "supportedProfiles": [
    "sidecat.system/0.1"
  ],
  "authProfile": "sidecat.local-ed25519/1",
  "maxFrameBytes": 1048576,
  "expiresAfterMs": 30000
}