Polygon makes new sidechain developer stack opensource, supporting ZK-powered Layer 2s on Ethereum
Polygon’s Chain Development Kit allows developers to freely build, customize and deploy layer 2 chains connected to the wider Ethereum ecosystem.
StarkWare, Herodotus launch tech to verify data from any point in Ethereum’s history
Storage Proofs could prove useful for services like account recovery tapping into the ability to access and verify historical Ethereum data.