Blockstream dreams up a whole new type of multisig called ROAST

The term multisig or multisignature refers to a method of transaction where two or more signatures must be signed off before it can be executed. The standard is widely accepted in crypto.

According to a May 25 blog post from Blockstream Research, ROAST's core idea is to make transactions between the Bitcoin network and Blockstream's sidechain liquid more efficient, automated, secure and personal.