Layer 2 expansion: beyond Hydra
A June 23, 2025, blog post by Fergie Miller summarizes a Cardano R&D session on Layer-2 expansion beyond Hydra. The session featured presentations on Midgard (an optimistic rollup), a zk-rollup from zkFold SA, a ZK bridge from Eryx Cooperativa, and Gummiworm (a scalable rollup from Sundae Labs). Key discussion themes included interoperability, capital fragmentation, and the importance of security.