Consensus, networking, and the core architecture of distributed ledgers.
Ethereum mainnet gas averaged 0.16 Gwei in June 2026 — a 3,000× drop from DeFi summer 2021. That collapse doesn't just cut costs; it invalidates five years of AI agent design assumptions and opens architectures that were economically impossible until now.
Zero-knowledge proofs can slash a double-signer but not a lying AI oracle. EIGEN's intersubjective fault model closes this gap via social consensus-driven forking — and it's live on EigenAI mainnet.
Majority voting counts hands — it can't rank quality. Fortytwo's Bradley-Terry protocol achieves 85.90% on GPQA Diamond vs. 68.69% for majority voting, extracting ranking signal from pairwise comparisons and making Sybil attacks economically unattractive.
EIP-7702, live in Pectra, lets an EOA borrow smart contract code for one transaction — no migration, no bundler. For AI agents: atomic batching closes the approve-to-swap MEV window, and session key delegation bounds the blast radius of a compromised agent without touching the master key.
Covenant-72B pre-trained a 72.7B-parameter LLM across 70+ anonymous internet peers. The key was SparseLoCo: 1.56% gradient density plus 2-bit quantization achieves 146× compression, collapsing the required uplink from 1.9 Gbps to 110 Mbps — consumer fiber.
38.6% of Ethereum blocks today go through censoring relays. FOCIL (EIP-7805) ends builder exclusion with a 16-validator committee and a 1-out-of-16 honesty assumption hardwired into the fork-choice rule — landing in the Hegota upgrade, late 2026.
Ethereum's blob fee market held at 1 wei for twenty months after Dencun, then broke in December 2025. Here's what the data shows, what drove the cycle, and what it means for L2s and AI agents that depend on cheap calldata.
A single cryptographic primitive — the KZG polynomial commitment — quietly powers EIP-4844 blobs, zkEVM proof systems, and on-chain verifiable AI. You can verify one on Ethereum for 50,000 gas ($0.067 today). Here's the math, the ceremony, and why every zkML system depends on it.
ERC-4337 lets AI agents transact without holding ETH — but the alt-mempool has its own fee market, bundler economics, and MEV surface every builder must understand.
Every EIP-4844 blob is secured by a KZG polynomial commitment — 48 bytes committing to 128 KB, verifiable in 50,000 gas. That efficiency required 140,416 people to collectively bury a secret for 69 days. Here's the math, the ceremony, and why Ethereum chose a different scheme for state.
Solana agents get 400 ms — but only if they declare every account they'll touch before execution starts. The Sealevel write-lock model, hot-account contention, Jito tip economics, and what the declarative execution contract means for AI agent design.
Ethereum's 12-second slot clock creates a hard lower bound on AI agent state freshness. Here's what that means for liquidators, arbitrageurs, and yield rebalancers — and how to engineer around it.