The other serious page
Cookies.
One cookie. It logs you in. That's the whole story — which is why there's no annoying banner.
Essential cookies (no consent required)
Session cookie — set when you log in, so you stay logged in. HttpOnly, first-party, deleted when it expires or you log out. The site can't work without it, which is why EU rules don't require consent for it.
What we DON'T use
No advertising cookies, no third-party trackers, no fingerprinting, no cross-site anything. Analytics is cookieless (Vercel Analytics): aggregated page counts with no cookies and no personal profiles.
Local storage (not a cookie)
If you start the join flow, your draft (profile URL, destination, amount) is saved in your own browser's localStorage for 30 minutes so a cancelled checkout doesn't eat your form. It never leaves your device.
How to clear everything
Your browser settings → clear cookies and site data for this site. You'll be logged out. The board won't miss you. (It will.)