The Doubling Book

This site collects the minimum needed to run a public guestbook.

1. Entries. Whatever you write is published publicly and permanently once payment is confirmed. Don't include anything you don't want public forever.
2. Payments. Checkout is handled entirely by Stripe. We never see or store your card details. See Stripe's privacy policy.
3. Bot protection. This site uses Cloudflare Turnstile, running invisibly, to filter automated abuse. See Cloudflare's Turnstile Privacy Addendum.
4. Moderation. Before publishing, entries are screened by an automated classifier (Anthropic's Claude) for rule violations. See Anthropic's privacy policy.
5. Rate limiting. IP addresses are temporarily logged to prevent abuse (10 checkout attempts per IP per hour). They are not published or sold.
6. Announcements. New entries may be posted publicly to @TheDoublingBook on X.

Questions? hello@thedoublingbook.com