A blockchain bridge is a protocol that connects two separate blockchains, allowing them to communicate with each other and exchange information and data.
A bridge in blockchain technology is a protocol that enables the communication between two different blockchain networks. It provides for transferring assets, such as digital currencies or tokens, from one blockchain to another, encouraging interoperability between separate ecosystems.
There are two types of blockchain bridges: multichain and cross-chain.
The cross-chain protocol enables interoperability between unrelated blockchain ecosystems with different protocols and consensus mechanisms. It promotes communication between other chains and the exchange/swap of information, data, and tokens. It also eliminates the need for any third-party intermediary, enabling users to use their bitcoins, for example, directly within the Ethereum ecosystem. This is established by creating a protocol that keeps the user’s original assets in a pool and gives back tokens (the so-called wrapped tokens) of an equivalent value that – thanks to smart contracts – are compatible with the other network.
Multichain refers to a project that uses multiple chains -at least two simultaneously- designed to communicate with one another. The multichain approach creates an internet of blockchains that allows users to transact across various ecosystems.
Bridges are an essential component of blockchain technology as they facilitate the exchange of data and assets, expanding the potential use cases of blockchain technology.