Ethereum Layer 2s and Layer 3s are on the agenda. Layer 2 Optimism has a service called Superchains. Coinbase created a blockchain named Base using that service. Xai level 3 chain is created on Arbitrum layer 3 service Orbit. Both Base and Xai are trendy nowadays.

Modular blockchains are also popular. Celestia and Eigenlayer are the examples. Ethereum layer 2 and 3 chains use data availability solutions of these chains.

ERC-404 allows developers to develop fractionalized NFT collections. Hence, it is an experimental technology; it created hype.