Author name: @nobumei (https://twitter.com/nobu_mei)
<aside> 💡 This page describes Bridge, another direction that seeks to resolve blockchain interoperability.
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The previous sections have described the challenges of blockchain interoperability. Polkadot and COSMOS are trying to solve this challenge, but a different approach to interoperability between blockchains is called Bridge.
This section deals with Bridge.
Status of the Blockchain Economic Area and Bridge
Bridge can be defined as a mechanism for transferring information between two or more blockchains.
As explained in the previous section, blockchains are not yet connected to each other. The "Bridge" is a mechanism that bridges between blockchains to enable data exchange.
For example, Bridge works by bridging the transfer of BTC on Bitcoin to Ethereum and converting it to WBTC available on Ethereum.
It sounds easy when you hear about just moving BTC to Ethereum to Bitcoin, but there are difficulties in implementing this with a mechanism that is not technically hackable because of the oracle problem in moving BTC between blockchains.
Below is a brief illustration of what Bridge actually does.
As an example, I illustrated the process of converting BTC to WBTC and making it usable on Ethereum, but there are other types of Bridges.
Unlike solutions such as Polkadot or COSMOS, which create a large main chain with sub-chains connected to it to provide interoperability, the Bridge solution provides interoperability between multiple blockchains by creating corresponding Bridges between them.
As a result, there are a vast number of Bridges connecting different economies, with separate projects for Bitcoin and Ethereum, for Ethereum and Solana, and so on.
Here is a table of the Bridges that connect each blockchain, and you can see that there are large numbers of Bridges.
