Buterin Pressures Layer-2s to Cut Withdrawal Times—Speed Now Trumps Decentralization

Ethereum’s architect is resetting the finish line for the networks built on top of it.

As major rollups like Arbitrum and Optimism tout progress toward “Stage 1” decentralization, Vitalik Buterin is arguing that speed—specifically, cutting withdrawal times to under an hour—is now a higher priority than reaching the next decentralization milestone.

In a new X post, Buterin calls for an urgent fix to a long-standing user pain point: the seven-day wait to move funds from Layer 2 back to Ethereum’s mainnet. “Waiting a week to withdraw is simply far too long for people,” he wrote.

That delay is a feature of optimistic rollups, which rely on a one-week fraud challenge period to secure withdrawals. While the model is secure, it’s increasingly impractical—especially as L2s aim to support real-world financial use cases.

The Bottleneck Behind the Bridge

The withdrawal lag isn’t just a user annoyance—it’s a capital drain.

For bridge operators and liquidity providers, every extra hour a transaction is stuck is money that can’t be moved, traded, or put to work. In intent-based bridging models—like those built around the proposed ERC-7683 standard—that idle capital turns into a mounting cost.

Buterin warns this creates “large incentives to instead use solutions with unacceptable trust assumptions,” undermining the entire purpose of L2s.

ZK-Proofs Take Center Stage

The fix? A shift toward validity proofs, better known as ZK-proofs.

Unlike optimistic rollups, ZK-based systems can prove transactions instantly and trustlessly, without the need for a challenge window.

Historically seen as too complex or expensive, ZK tech is now maturing fast. Buterin sees it as the path forward—and proposes a hybrid design to speed up adoption.

One idea: a “2-of-3” proof system, where a transaction must be verified by two of the following:

• A ZK-proof (fast and trustless)
• An optimistic proof (trustless and proven)
• A trusted execution environment (fast but trust-based)

The approach allows for hourly native withdrawals in the short term—down from the current weeklong wait. In the long run, Buterin envisions all L2s submitting ZK proofs into a single, cheap L1 transaction every 12 seconds, enabling near-instant cross-rollup transfers.

ChainStreet’s Take: The Scaling War Just Reopened

Buterin’s pivot isn’t academic—it’s strategic. He’s signaling that decentralization milestones aren’t enough if the user experience falls short.

The message to Arbitrum, Optimism, and others is clear: evolve or be left behind. L2s that can’t support fast, cheap capital movement will be outpaced by ZK-native competitors.

At stake is Ethereum’s role as the global settlement layer. If Buterin’s roadmap plays out, Ethereum won’t just be secure—it’ll be the backbone of a liquid, interoperable, high-speed digital economy.

And the clock is ticking.