Gratz nice idea.
It is a nice turn around until we have some standard for segwit addresses signatures
Long ago I made a topic about this subject. The situation is still the same. Only Electrum made it own standard for segwit signed messaged, this is why you cannot verify those in any other wallet
https://bitcointalk.org/index.php?topic=2885058.msg29647827#msg29647827Thank you for sharing, I was not aware of this topic

How to verify SegWit signature with Brainwallet ?
And that's all for this little tutorial

Great guide/tutorial thanks

I would add to that only one warning. Brainwallet is dangerous to use because human mind is not that complicated in terms of creating passwords (brainwallet).
Because of that many many many brainwallets got hacked and will be hacked in future because people still using them.
Um, I understand that Brainwallet is dangerous for the creation of address, but in terms of verification, there is no problem if I'm not mistaken ?