Layer 2 protocols
Current layer 1 blockchains have limited scalability and privacy. In fact, layer 1 blockchains will remain the bottleneck for scaling Web 3 applications. Current scaling solutions include state channels, sidechains, sharding and zero knowledge proofs. A few layer 2 solutions have been implemented but none are widely adopted yet. The Lightning network on Bitcoin and Plasma implementations on Ethereum are the best known layer 2 protocols. More recently, zk-proofs and optimistic rollups are gaining popularity.

All layer 2 blockchain protocols
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Layer 1 Blockchains
We list all layer 1 protocols and share their best onboarding resources and blockchain insights.

Blockchain Scalability Research
Our blockchain knowledge base includes a section on blockchain scalability with up-to-date research on scaling approaches.

Awesome layer 2 blockchain projects
Virale shared a good collection of layer 2 blockchain solutions on Github.