Captcha

Gate
Lobby

Cosmobot has two types of captchas. Gate - to protect a public group, and Lobby - to shield a private group. Gate is the most popular. Captcha itself combines a few randomized educational security questions and emoji matching to prevent automatic bot joining.

Gate

Gate type of captcha works like this:

Users join the group, but cannot speak until they pass the captcha.
If they fail to press the "verify" button in 2 minutes, the captcha message will disappear from the group chat.
They will still be able to see the chat for 30 minutes.
After this, they will be kicked from the group.

They can rejoin and attempt to pass the captcha again one minute after being kicked.

Usage

Set Gate

To set up a gate in a chat use the case-sensitive #setgate command:

#setgate|chatUsername:<chat username>|chatId:<chat numericID>

For example,

#setgate|chatUsername:cosmobotDemo|chatId:-1001588259136

chatUsername is the public group link without "@" or "t.me/".

Delete Gate

To delete a gate use the following #deletegate command:

#deletegate|chatId:<chat numericID>

For instance,

#deletegate|chatId:-1001588259136

To view existing gates use the #showgate command.

Lobby

For extra privacy, it is possible to set up a lobby channel as the main link that users are directed to from your website, Coingecko, Coinmarketcap etc. The channel can have a few messages in it, like the Terra Network Lobby. The bottom (most recent) message links to a captcha with Cosmobot which must be passed to access the group, a private group with no public link.

As this requires more advanced work of linking a channel to a group and to Cosmobot, please DM @cosmosrescue on Telegram if you would like to use this feature.