Split key into shares. M-of-N signs. No single party ever holds the complete key. The signature that comes out is a standard BIP-340 Schnorr. Indistinguishable from a single signer.
We have frostr signers in basically EVERY app environment! Now we are working on making them easier / more performant with the upcoming V2 of our protocol.
This first release is intentionally simple and for early adopters: a background signer powered by our background soundscape approach (works with any existing Frostr keyset)