Bridges

Bridges are smart contract systems and relay infrastructure that lock assets on one blockchain and mint equivalent representations on another, enabling asset transfer between separate networks with distinct validator sets and consensus mechanisms. Bridge architecture typically involves custodians, validators, or cryptographic proofs that verify transactions from the source chain and authorize corresponding minting on the destination chain. While bridges solve immediate interoperability needs, they introduce new security risks since they require trusting bridge infrastructure that sits outside the security guarantees of either underlying blockchain. Example: Lido's bridge protocol allows users to deposit Ethereum and receive wstETH on Polygon and other chains, with validator committees confirming Ethereum deposits before authorizing token minting on destination networks. Why it matters for cross-chain interoperability: Bridges are the primary user-facing infrastructure enabling cross-chain asset movement, making their security and efficiency critical to whether multi-chain applications can practically serve users without excessive delays or risk.

Category: cross chain, infrastructure applications

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