Bitcoin does, but Ethereum doesn’t, at least not originally.

There is some way to encode a checksum in the capitalization of the letters/digits A-F, but I’m not sure how ubiquitously supported that is. It seems like a pretty bad hack in any case.

Fascinating, I am unaware of the inner workings of Ethereum.

It boggles that they could make such a massive design error, especially with the Bitcoin examples staring them in the face.

I believe the idea was that “nobody will use raw low level addresses, so we don’t need to make them usable”.

But ENS is now prohibitively expensive in terms of fees and also not universally supported, so here we are.