Looking at examples of L2

There are many L2 blockchains that are competing to attract users. The most popular ones are Polygon, Arbitrum, Optimism, Manta, Base, Starknet, and zkSync, but there are many more. You can check a list of active L2 blockchains at https://l2beat.com. Let’s take a look at some examples of L2 blockchains.

Polygon

Although I’ve explained that L2 is a technology that helps Ethereum scale, there is another technology that has the same goal – this is sidechain. The difference between these two technologies is that sidechain technology doesn’t depend on the Ethereum mainnet for its security. Sidechain has its own algorithm to validate transactions. Polygon is a sidechain blockchain. It can interact with the Ethereum mainnet by posting cryptographic messages to a smart contract on the Ethereum mainnet.

So, Polygon shouldn’t be on this list because it is a sidechain blockchain. However, its consensus mechanism in validating...