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Multi-Signature (multisig) is a wallet configuration that requires at least two keys to authorize a transaction. Commonly used by cryptocurrency exchanges to ensure funds can’t be moved by a rogue employee, multisig also has applications for end-users. If you’re seeking to enhance the security of your noncustodial bitcoin wallet, multi-signature might be the answer.

Source: How to Use Multisig to Keep Your Coins Ultra-Safe