Cross-Chain Bridge Security

A cross-chain bridge is infrastructure that moves assets from one blockchain to another. Example: you have 1 BTC on Bitcoin, you want to use it on Ethereum. A bridge locks the BTC on Bitcoin, creates a wrapped BTC (wBTC) on Ethereum, and sends it to you. Later, you can burn wBTC on Ethereum, unlock BTC on Bitcoin, and receive it. Bridge security is about ensuring that: