Keybase always performed crypto on-device using their open source client written in Go. What not-your-keys not-your-crypto setup are you referring to?

Alternatively for the case of id strings with known prefixes, a unique feature of TypeScript is you can use template string literal types:

https://www.kravchyk.com/adding-type-safety-to-object-ids-ty...

April fool's at xkcd is a special occasion where external folks join xkcd to build an experimental interactive comic.

Edit: I've updated the first para of the post to hopefully clarify this better

Residential fiber internet is a lovely thing :D

Funny story -- when I was working on the xkcd Machine comic, I actually used the ZFS snapshots to rescue data. I accidentally blew away some early physics prototype code and fished it out of /.zfs/snapshot.