Cool! How is it related to Nostr, tho? You can't zap someone unless both of you zap them from their own accounts?
Welcome! Multisig is a system where two or more people each have a key to a wallet. They can only unlock the wallet if all parties agree. This makes it possible to do some cool things with Bitcoin.
Check out the [Bitcoin Justice Protocol](https://privatelawsociety.net/) for more information!
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