Privacy policy

Who we are

21btc.cc (21 BTC) is a free bitcoin data and education site run by Ihor Kubalskiy. The same site is also served at 21btc.cc and bitcoinhub.asia. This policy covers both.

Reading the site

You can read everything, including the forum, without an account. We do not ask for your name, email or phone number.

Signing in with X

To post on the forum you sign in with your X (Twitter) account. We request read-only access (users.read, tweet.read, offline.access). We cannot post, follow, like or send messages on your behalf.

From X we store: your X user id, handle, display name and profile picture URL. To limit spam we also keep your X account creation date, follower count and verified flag. We do not keep your X access or refresh tokens: they are used once to read your profile and then revoked.

Forum posts

Your posts, replies, likes and reports are stored on our server with the time they were made. Posts and your handle, name and avatar are public. Reports are visible only to the moderator.

You can delete your own posts at any time. A deleted post is no longer shown. To erase your whole account and all posts, message @kubalskiy on X and we will do it within 30 days.

Cookies and local storage

qf_sess: a random, httpOnly session cookie set only after you sign in, valid for 30 days or until you sign out. qf_oauth: a short-lived (10 minute) cookie used only during X sign-in. qbein-locale: remembers your language.

In your browser's local storage we keep your theme, language and share-prompt state. These never leave your device.

Analytics

We use Google Analytics 4 to count visits, pages and share clicks. Google sets its own cookies (_ga, _ga_*) and processes your IP address under Google's privacy policy. We do not send your X profile or posts to Google.

Server logs and IP addresses

Like any web server, ours writes standard access logs (IP address, time, page, browser). For rate limits the forum keeps IP addresses in memory only, for up to one day; they are not written to the forum database.

Sharing and selling

We do not sell your data and do not share it with anyone except as described above (X for sign-in, Google for analytics), or when the law requires it.