Ethereum (ETH)

The Ethereum blockchain went live on July 30, 2015. Ethereum consists of one blockchain where both its own transactions (ether) and those of numerous other coins (tokens) are recorded. Whereas Bitcoin focuses mainly on payments, Ethereum focuses more on so-called “smart contracts”. The programming language of Ethereum is written in such a way that programmers can write their own programs based on the Ethereum blockchain. This means that if you want to use blockchain technology…

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Ethereum Layer 2 solutions:

Arbitrum

“Arbitrum is a Layer 2 cryptocurrency platform that makes smart contracts scalable, fast, and private. Arbitrum interoperates closely with Ethereum, so Ethereum developers can easily cross-compile their contracts to run on Arbitrum. Arbitrum achieves these goals through a unique combination of incentives, network protocol design, and virtual machine architecture. Arbitrum has three modes: channels, AnyTrust sidechains, and rollup. Channels and sidechains provide the AnyTrust Guarantee which ensures that the code will run correctly as long as any validator is honest.”

Source: Offchain Labs Github