The newly planned Public Key Color function of noStrudel is cool at the first glance, but in fact is counterproductive, dangerous and borderline stupid. It takes less than 3 minutes on a CPU from 2015 to generate public key with the same prefix and color. Use NIP-05 or compare full public keys to make sure that you are talking to the correct account.

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it's not a new thing it's been around for a while, I also saw a nice thing in this repo https://github.com/1l0/hexpattern

maybe it can be used by some bridge

Wow, this is different and actually pretty cool. Representing pubkey as a pallette is so much better, safer and overall makes so much more sense. Someone should show this to the noStrudel people.