github.com/mxssl/tg-captcha-bot

Telegram Captcha Bot

Telegram bot that validates new users that enter supergroup. Validation works like a simple captcha. Bot written in Go (Golang).

This bot has been tested on several supergroups (2000+ people) for a long time and has shown its effectiveness against spammers.

Cloud hosted instance of the bot

@cloud_tg_captcha_bot

How it works

1. Add the bot to your supergroup
2. Promote the bot for administrator privileges
3. A new user enters your supergroup
4. Bot restricts the user's ability to send messages
5. Bot shows a welcome message and a captcha button to the user
6. If the user doesn't press the button within 30 seconds then the user is banned by the bot

If you want to run your own instance of the bot

• Option 1 (the easiest one): docker-compose + already built docker container
• Option 2: docker-compose + build your own docker container
• Option 3: systemd

Commands

/healthz - check that the bot is working correctly

Сustomization

You can change several bot's settings (welcome message, ban duration, socks5 proxy server) through the configuration file config.toml

Alternatives / Forks

• momai/tg-captcha-bot - fork of tg-captcha-bot with interesting additional features.