Multi-Party Blocks Go Live On Ethereum

It's Wednesday, September 16, 2026.

Multi-party block construction goes live on Ethereum. The SEC and CFTC lead crypto rulemaking after the CLARITY Act stalls. The Federal Reserve raises interest rates by 25 bps. And Aave hits $1 billion in V4 deposits.

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Multi-Party Blocks Go Live On Ethereum

Blockspace Forum launched multi-party block construction (MPBC) on Ethereum mainnet, extending the existing PBS pipeline so multiple builders can contribute transactions to a single block rather than one builder assembling the entire block. Most Ethereum blocks are still built by a single builder; MPBC is additive and does not replace single-party PBS. A coalition of builders, operators, and validators supporting the rollout accounts for more than 85% of the connected transaction pipeline.

The initial MPBC operators are Aestus, Titan, and Ultra Sound. They merge additional unincluded transfers and blobs onto a base block and deliver the result through existing PBS endpoints, so proposers already connected to those operators need no configuration change. MPBC is intended to ease inclusion, robustness, and censorship-resistance limits in single-party PBS by letting builders earn from transactions they contribute even if they do not win the whole slot. Proposers still select blocks through the standard PBS auction and accept an MPBC block only when it is the highest bid.

The first version is append-only: extra transactions are added after the base block and cannot rewrite it. The design runs on current infrastructure, is compatible with upcoming FOCIL (EIP-7805), and is designed to remain compatible with ePBS.

SEC And CFTC Lead Post-CLARITY Rulemaking

The SEC and CFTC announced plans to advance comprehensive digital asset frameworks using existing statutory authorities rather than waiting on Congress. SEC Chair Paul Atkins stated the commission will act decisively with or without legislation to provide market certainty, building on recent tailored offering proposals and initiatives across issuance, custody, and transfer-agent modernization. CFTC Chair Mike Selig confirmed his agency is prepared to issue market-structure rules under the Commodity Exchange Act, pledging to establish clear standards for spot digital commodities.

The statements come after the CLARITY Act failed to clear a Senate vote. The regulators will now rely on joint interpretive frameworks, targeted safe harbors, and administrative rulemaking to define token taxonomies, clarify DeFi guidelines, and expand access to tokenized assets. While agency-level rules cannot establish the federal registration regimes or statutory boundaries proposed in the bill, the frameworks provide near-term legal clarity for founders in the United States.

Fed Announces 25bps Rate Hike

The Federal Reserve raised interest rates by 25 basis points to a target range of 3.75% to 4.00%, aiming to accelerate progress toward its 2% inflation objective. The Federal Open Market Committee voted unanimously 12–0 for the rate hike. Policymakers signaled that borrowing costs could rise further before year-end. Updated projections show 12 of 18 officials anticipate one additional quarter-point hike this year, four project two more increases, and only two favor holding rates steady.

Misc News

Aave V4 hits $1b in deposits. Yam Finance was targeted by a governance attack. Hyperliquid introduces Share. Oasis Pro Markets (by Ondo) joins DTCC’s Fund/SERV. And Arc goes live on mainnet.

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