What are Layer-0 Blockchains like Avalanche, Cosmos & Polkadot?

L0 blockchains enable the creation of custom blockchains. They are designed for speed, cost-efficiency & flexibility. They support multiple protocols, enabling interoperability between diverse blockchain ecosystems. They use a modular approach that separates the network layer from the consensus layer. Popular L0 and their market caps - Avalanche ($21B), Cosmos ($4.8B) & Polkadot ($13B).