Ethereum Builders Face a Costly Choice Over Payment Guarantees

Ethereum Builders Face a Costly Choice Over Payment Guarantees


Secured collateral vaults and a direct relay bridge connect an Ethereum block builder to a validator image By Isaac • September 14, 2026 11:13 pm •

Ethereum’s next block-building system could give validators stronger payment guarantees. The price of that security may be a large pile of ETH sitting idle inside the protocol.

That tradeoff is becoming a live question as builders, relays and staking operators prepare for enshrined proposer-builder separation, better known as ePBS. The design separates the validator proposing a block from the builder assembling its transactions.

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CryptoSlate reported that the proposed system supports two forms of payment. A collateral-backed payment draws from ETH that a builder has deposited inside the protocol, while a trusted payment depends on the builder honoring a promise through another route.

The collateral route protects a timely proposer even if the builder fails to deliver

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