What the test website stores
Optional Google sign-in is used only to establish a persistent Jianwu identity. The server stores your Google account's opaque subject identifier, a Jianwu account ID, an editable display name, hashed login-session tokens, and links to rooms you have joined. Google verifies your identity; this app does not store your Google password, Google email address, or Google refresh tokens.
Jianwu also stores online room move history, game results, time controls and hashed seat credentials. Anyone who receives a room link may view that room's game history. Browser storage keeps guest matchmaking and seat tokens so you can reconnect. Cloudflare hosts the service and its D1 database.
Google sign-in uses a temporary authorization transaction, the OpenID scope, and a server-side signature check. Login sessions expire after 30 days unless revoked sooner. Expired server rows and old room data may remain until deleted by site maintenance; the site has no automated universal data-retention guarantee yet.
The Delete my profile feature removes the Jianwu account and its session and game-profile links. It does not erase room records or copies another participant exported. This testing service is not yet suitable for unrestricted public signup. The site owner must supply an accessible privacy/support contact and review applicable policies before opening registration to the public.