Multichain protocols and cross-chain bridges

A bridge is a structure that facilitates the transfer of funds and information between different chains. The market recognizes three groups of chains:

• L1 chains are the well-known blockchains, such as Bitcoin and Ethereum. It is called Layer 1 as the core team generates a layer of solutions over the foundation layer to increase scalability. An example of the evolution of L1 is the Ethereum merge, which occurred in September 2022.
• L2 chains are integrations that run on top of a blockchain to improve specific aspects, often focusing on scalability. These scaling solutions allow the main chain to offload data to a parallel architecture, processing it there and saving only the results on the main chain. Successful L2 chains include Optimism, Arbitrum, and Polygon zkEVM.
• Sidechains are new blockchains that are connected to a major blockchain. For instance, Rootstock is linked to Bitcoin, enabling EVM smart contract programming...