A multisig wallet setup divides control among multiple keys, so one key usually can’t authorize a transaction alone. This guide covers key decisions and checks for Bitcoin and Ethereum users, with details current as of November 2, 2026. A multisig wallet requires a defined number of signatures from its registered keys. In a 2-of-3 arrangement, three keys are registered and two must approve a spend. This can reduce reliance on one device, but adds coordination and recovery work.