I remember telling them years ago that the reliance on matrix was terrible. Are they still using it for the message passing though? They don’t mention what protocol replaced matrix, if any.
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It's in the blog post (no, it's no longer using Matrix): 
Nunchuk
Group Wallet: Simpler, Stronger, Better
Three years ago, we introduced our very first attempt at a collaborative multisig wallet—a Matrix-based solution. Although it was a groundbreakin...