Ethereum co-founder Vitalik Buterin outlined an ambitious, years-long plan to make the Ethereum base layer faster, leaner, and eventually quantum-resistant, starting with shorter slot times and near-instant finality.
Ethereum’s 2029 Vision: Fast Slots, Fast Finality and STARK-Friendly Hashes
In a detailed post on X, Vitalik Buterin walked through what he called a “very important document,” referring to the newly published “strawmap,” a strawman roadmap introduced by Ethereum Foundation researcher Justin Drake. The document sketches a long-term vision for Ethereum layer one (L1) upgrades through the end of the decade.
“We’ll start with fast slots and fast finality,” Buterin wrote. “I expect that we’ll reduce slot time in an incremental fashion,” pointing to a “sqrt(2) at a time” formula that would move Ethereum from 12-second slots to 8, 6, 4, 3 and potentially 2 seconds. The last steps, he cautioned, depend on “heavy research.”
What Is the Strawmap?
The strawmap — a portmanteau of “strawman” and “roadmap” — is not an official decree but a coordination tool. According to Drake, it is aimed at advanced readers, including researchers, developers, and governance participants, and presents Ethereum’s L1 ambitions on a single visual timeline.
Its five “north stars” include a fast L1 with slots and finality measured in seconds; a “gigagas” L1 targeting 1 gigagas per second through zkEVMs and real-time proving; a “teragas” L2 pushing data availability to 1 gigabyte per second; post-quantum cryptography; and first-class privacy for ETH transfers.
The timeline extends to 2029, assuming roughly one fork every six months. Upcoming and placeholder forks appear in a star-based naming sequence, continuing Ethereum’s tradition of cosmic branding.
Faster Slots, Same Security?
Today, Ethereum runs on 12-second slots. Buterin explained that slot time will be treated as a tunable parameter, adjusted downward when confidence is high enough that safety is preserved.
“The high level is that we’ll view the slot time as a parameter that we adjust down when we’re confident it’s safe to,” he wrote, comparing it to how blob targets are calibrated.
Crucially, he argued that most of the broader roadmap is independent of slot duration. “We would need to do roughly the same things whether the slot time is 2 seconds or 32 seconds,” he said.
One key enabler is peer-to-peer (p2p) networking improvements, including work using erasure coding. Instead of each node receiving entire block bodies from multiple peers, blocks could be split into pieces — for example, eight fragments where any four can reconstruct the full block. That approach preserves redundancy while reducing bandwidth overhead and latency spikes from slow peers.
Buterin said internal statistics suggest this architecture can significantly reduce 95th percentile block propagation time, making shorter slots viable without sacrificing security, aside from added protocol complexity.
Rethinking Attesters and Slot Structure
Other changes intersect with proposals such as ePBS, FOCIL, and a fast confirmation rule, which introduce more complex slot structures. These features tighten latency margins, reducing the safe maximum from roughly one-third of a slot to one-fifth.
To offset that compression, researchers are exploring a design where only 256 to 1,024 randomly selected attesters sign each slot. For non-finalizing fork choice, Buterin remarked that a smaller set is sufficient. Fewer signatures would allow the removal of the aggregation phase, trimming precious milliseconds from each slot.
Finality in Seconds, Not Minutes
If slot time is the drumbeat, finality is the settlement stamp. Today, Ethereum finality averages about 16 minutes, based on 12-second slots and multi-epoch confirmation under the Gasper design.
The strawmap proposes decoupling slots from finality and adopting a one-round finality Byzantine fault-tolerant algorithm known as a Minimmit variant. In the end state, finality could land in the 6- to 16-second range.
“Fast finality is more complex,” Buterin acknowledged, adding that the ultimate protocol may be simpler than the current Gasper system, even if the transition path is invasive.
A possible trajectory outlined in his post moves from today’s 16 minutes to progressively shorter intervals — including sub-minute finality — before reaching single-digit seconds under Minimmit with more aggressive parameters.
Post-Quantum and STARK-Friendly by Design
Because the shift is sweeping, Buterin said the largest step may be bundled with a cryptographic overhaul, including post-quantum, hash-based signatures and a STARK-friendly hash function.
Developers are evaluating responses to recent concerns around Poseidon2, including increasing round counts, reverting to Poseidon1 or adopting conventional hashes such as BLAKE3. Research is ongoing.
One notable consequence of the incremental approach is that slot-level quantum resistance could arrive before finality-level protection. In that scenario, if powerful quantum computers emerged suddenly, finality guarantees could falter while the chain itself continues operating.
A ‘Ship of Theseus’ Upgrade
In his summary, Buterin framed the process as a gradual component-by-component replacement. “Expect to see progressive decreases of both slot time and finality time,” he wrote, intertwined with what he described as a “ship of Theseus” transformation of Ethereum’s slot structure and consensus.
The strawmap, in short, is not a promise but a proposal — a dense blueprint inviting debate over how Ethereum’s base layer should evolve. Whether the network reaches 2-second slots and single-digit finality by decade’s end will depend on research, governance and the messy art of decentralized consensus.
But the direction is clear: faster blocks, faster settlement, and a protocol designed to outlive both hardware cycles and cryptographic eras.
FAQ 🔎
- **What is the Ethereum strawmap?**The strawmap is a long-term, strawman roadmap outlining proposed Layer 1 upgrades through 2029.
- **How fast could Ethereum finality become?**Under proposed changes, finality could eventually fall from about 16 minutes today to roughly 6–16 seconds.
- **What are fast slots in Ethereum?**Fast slots refer to reducing block times from 12 seconds to as low as 2 seconds, pending research and safety validation.
- **Does the strawmap make Ethereum quantum-resistant?**The plan includes migrating to post-quantum hash-based signatures, potentially making parts of Ethereum quantum-resistant before full finality protection is upgraded.
