BitLocker does this and it's nice UX for walking someone through a recovery key over the phone.

Another VERY nice feature is it hashes each set of 6 digits as you type, so if you transpose one, you immediately get feedback instead of "invalid key!" after typing the whole thing out.

> hashes each set of 6 digits

nice, now i can dictionary attack any key, 6 digits at a time

I don't think that's how it works... It's a checksum, not letting you check if each section is part of the key.

At worst, the key would have some portion less entropy since there's a lot of bits used for checksums.

I don't think we're talking about the same problem here.

Regardless of how many dashes you have or how (ir)regularly they are spaced, to select the whole ID you must carefully click-drag-release around its boundaries, you can't just double-click anywhere in it to select.

use the character 'v' to separate sections? That would solve that problem, and it isn't a hex character

0000v0000v0000v0000v0000v0000v0000v0000