A multisig is a crypto wallet that needs approval from several keys before a transaction can go through, such as any three of five signers. It removes the single point of failure of one private key.
Key management is the set of practices and systems for creating, storing, using, rotating and retiring cryptographic keys. It keeps encrypted data and digital signatures trustworthy.
A smart wallet is a crypto wallet that is itself a smart contract. Because its rules are code, it can offer recovery without a seed phrase, spending limits, batched actions and sponsored gas.
An upgradeable proxy is a smart contract pattern that lets code be changed after deployment. A fixed proxy address holds the data, while a separate logic contract can be swapped for a new version.
A cross-chain bridge is a protocol that moves tokens or messages from one blockchain to another. It usually locks an asset on the source chain and issues a matching representation on the destination.
A decentralized autonomous organization (DAO) is a group coordinated through smart contracts rather than a management hierarchy. Members propose and vote on decisions such as spending or protocol upgrades.
An MPC wallet is a crypto wallet whose private key is never held in one place. Several parties each keep a key share and sign together, so no single device, person or server can move funds alone.
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