What is Nostr?
conduition
npub1l6u…zvtg
2024-02-12 16:06:03
in reply to nevent1q…are0

conduition on Nostr: Actually bringing your own key is possible, but there are limitations. A FROST ...

Actually bringing your own key is possible, but there are limitations.

A FROST signing share is a polynomial evaluation. If, say, 3 people join together each bringing their own fixed signing shares, there exists some quadratic polynomial that interpolates their shares. However, it's impossible to find a linear (degree-one) polynomial which does the same.

In practice, this means if `n` people BYOK, they can definitely create an `n` of `n` threshold key with FROST. They can then issue new shares to add more people to the FROST group if they wanted, to make it an `n` of `m` threshold.

I'm not sure about the security implications of what a DKG would look like if only SOME keys are fixed and others can be variable. That's a different ball game 😅
Author Public Key
npub1l6uy9chxyn943cmylrmukd3uqdq8h623nt2gxfh4rruhdv64zpvsx6zvtg