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Introduction

Ethereum offers bridges to other cryptocurrencies like Bitcoin. These bridges can be used to construct a dual layer commitment system where proofs exist on two blockchains. Bridges can also offer a choice between two chains atomic swaps with other chains, etc.
In essence, a bridge is like having two-L1 blockchains to commit to and the trust model is dependent on the least secure of the two blockchains along with the bridge's smart contract.