Ethereum's Fusaka upgrade is scheduled for December 3, targeting the biggest bottleneck in crypto: data availability for Layer 2s. PeerDAS, blob scaling, and gas limit increases could unlock 10x throughput without overloading nodes. Here's what's actually changing 🧵
Current state: Validators must store all blob data for ~18 days. At 6 blobs per block, that’s roughly 40–100 GB of storage depending on usage. Post-Fusaka: Validators store only their sampled shards. Hardware load drops, making the operation lighter and more decentralized.
Blob capacity is expanding through new Blob Parameter-Only (BPO) forks. Instead of a static limit (6/9 blobs today), developers can raise capacity incrementally after Fusaka, once performance data is in. More blob space → cheaper data posting → lower L2 fees for users.
@hildobby The gas limit increases from 45M to 60M, with research suggesting the network can safely handle up to 150M. The 16.7M per-transaction gas cap helps prevent chain spamming and reduce gas fee spikes during extreme congestion periods.
What this means for Layer 2s: @arbitrum, @Optimism, @base, and other rollups can batch significantly more transactions per blob. Lower data posting costs translate directly into reduced fees for end users. The rollup-centric vision gets its biggest infrastructure upgrade yet.
Understanding Fusaka in non-technical terms: Ethereum’s upcoming Fusaka upgrade introduces a smarter way to distribute data across the network. Instead of every node downloading all the data (which wastes bandwidth), a system called PeerDAS lets nodes share the work, i.e. each node only stores a small piece of the total data. Think of it like dividing a big file among many people: no one carries the whole thing, but together they keep it safe and verifiable.
But Fusaka isn't just about scaling - it includes UX improvements too. Deterministic proposer lookahead enables preconfirmations, while secp256r1 support brings hardware wallet integration via Apple Secure Enclave and Android Keystore. Passkeys for Ethereum accounts, essentially.
Timeline: → Holesky testnet: Oct 1 (live) → Sepolia testnet: Oct 14 (live) → Hoodi testnet: Oct 28 → Mainnet target: Dec 3 Plus a 4-week bug bounty with $2M in rewards for security researchers. Testing is comprehensive before mainnet deployment.
JUST IN: 🚨 Ethereum Fusaka upgrade scheduled for December 3rd which will boost L2 TPS to 12,000 in 2026.
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