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Concepts
Multisig
An address requiring multiple signatures to spend (e.g. 2-of-3 keys)
Definition
An address whose UTXOs require M-of-N signatures (e.g. 2-of-3) to spend. Common in institutional cold storage and exchange custody. Common-Input heuristic still works but co-signers may not be co-owners — handle clusters carefully.
Context anchor
Most exchange cold-vaults are 3-of-5 or higher; personal multisig usually 2-of-3
Example
Coinbase Custody uses 3-of-5 multisig for institutional cold storage
Also known as
multisigmultisignaturem-of-n