Ethereum just shipped a major piece of its scalability puzzle on December 3rd, 2025—the Fusaka upgrade went live with PeerDAS, bringing efficient data availability sampling to mainnet. Instead of every node downloading entire rollup blobs, they now just grab about 1/8 of the data. It's a clever way to reduce bandwidth requirements while maintaining security guarantees.

The upgrade also expanded capacity through Blob-carrying Proposers (BPOs), pushing the network's throughput ceiling higher. But the momentum doesn't stop there. Ethereum's zkEVM roadmap is getting serious about security, targeting 128-bit equivalence by the end of 2026—a major shift toward formal proofs rather than simpler verification schemes.

Here's what's got people talking though: as Ethereum polishes its settlement layer capabilities and rollup throughput, some are asking whether this moves the needle in the Layer 2 vs. Bitcoin settlement game. Can Ethereum genuinely compete on finality guarantees and economic security? That question's still being stress-tested by the market.