I complained about this months ago. I was proven wrong.
Cashu has multisig available.
Discussion
Rly?
I have never seen anything about cashu being multisig
no cashu has onchain available in v1, to do a multisig for the onchain you'd have to run a distributed consensus among the signers aka fedimint, then the ecash itself is single sig so it wouldnt be atomic with the multisig reserves the same way you can with single sig onchain/ln cashu.