Fortunately, "IRC with a few tweaks" is being actively developed under the name IRCv3 and it seems that scrollback support is defined by a combination of these

Fortunately, "IRC with a few tweaks" is being actively developed under the name IRCv3 and it seems that scrollback support is defined by a combination of these specifications: https://ircv3.net/specs/extensions/batch/chathistory-3.3 https://ircv3.net/specs/extensions/batch/chathistory-3.3 https://github.com/ircv3/ircv3-specifications/pull/393/files https://github.com/ircv3/ircv3-specifications/pull/393/files