From a new member's perspective, joining a Telegram group protected by @doublegram_captcha_bot is a short gate before they can chat.
Standard join flow
- User joins the group (invite link, add, or approved join request).
- Immediate mute — they cannot send messages, media, polls, stickers, or link previews.
- Welcome message appears in the group, mentioning the user with a button:
- Verify Captcha → opens the Telegram Mini App
- They tap the button and complete verification (see Complete reCAPTCHA Verification in Telegram).
- On success, the group message updates to confirm they can speak.
The verify button opens:
https://t.me/doublegram_captcha_bot?startapp=miniapp&size=compact
Trusted users (cross-group trust)
If Cross-Group Trust is enabled and the user already completed Captcha in another protected group (within your trust rules), they may skip mute and captcha. The bot posts a short auto-verified message instead.
Admins configure trust in /settings → Cross-Group Trust.
Who is skipped automatically?
- Bots — not put through human captcha
- Group admins and creator — not muted on join
- Trusted returning users — per cross-group trust settings
If they do nothing
If the member never opens the Mini App, their token expires after the group's verification timeout (default 5 minutes, configurable 1–60). They are then kicked or banned and the group message updates.
Member tip: Verification must be done on the same Telegram account that joined the group.
Silent mode
If admins enabled Silent Mode in /settings, success and kick messages are auto-deleted after a delay. The pending verify button stays until the user verifies or times out.
Quick reference
- On join: mute + Verify Captcha button
- Trusted users: auto-approved message
- Default timeout: 5 minutes
- Skipped: bots, admins, trusted users
Related: guide members through completing reCAPTCHA in Complete reCAPTCHA Verification in Telegram.