Vitalik Buterin is once again bringing us back to the fundamental questions of Ethereum's architecture. This time, the network's co-founder has publicly supported the idea of borrowing Bitcoin's coin-tracking model, which could be the key to solving the long-standing problem of blockchain state "bloat." Essentially, this is about revisiting the approach to storing account data, which weighs heavily on every network node.
Why Ethereum "gets heavier" every day
The problem, which has been discussed for years, lies in the unlimited growth of data. Every new account on Ethereum is 100 to 150 bytes that remain forever in the memory of thousands of nodes worldwide. Even if a wallet is created and forgotten, its record continues to take up space, increasing hardware requirements and slowing down synchronization. I have repeatedly noted that this is one of the most critical bottlenecks in the network's long-term development strategy, and it seems that the Ethereum Foundation has finally started seeking radical solutions.
The Bitcoin approach: UTXO as a panacea?
Ethereum Foundation researcher Toni Wahrstätter has proposed looking at the UTXO (Unspent Transaction Output) model, which Bitcoin has used since 2009. Instead of storing the total balance of each account, this model tracks each specific unspent coin. After a coin is spent, only about a third of a byte of data remains in the system—a minimal footprint that cannot be compared to the permanent "weight" of Ethereum accounts.
The scale of the difference is impressive: a billion accounts in the current Ethereum model would take up to 150 GB, while a billion spent coins in the UTXO model would take only about 300 MB. That's three orders of magnitude less! The benefit for nodes and validators is obvious, and therefore for the entire ecosystem as a whole.
Synthesis of ideas: compact proofs and new opportunities
Buterin did not just support the idea but also proposed its development. It involves allowing nodes to collect multiple transaction verifications into one compact package using cryptographic proofs. A developer under the pseudonym conall.gwei combined both concepts: the block creator could publish a single summary file of 128 KB that instantly confirms a huge number of payments.
Vitalik also highlighted the Utreexo project from the Bitcoin community, which allows verifying coins without storing the full list of addresses. In his vision, both approaches would work synergistically in Ethereum: most operations scale, and anyone could run a full node without ultra-high disk requirements.
Looking to the future and market reaction
These ideas form the foundation of the "Lean Ethereum" roadmap, which has already sparked debates about implementation timelines. The Foundation continues to move forward, introducing innovations, including a change in cryptography to protect against future quantum threats. However, as is often the case, the market has yet to fully appreciate technical breakthroughs: ETH is trading around $1903, unsuccessfully trying to hold above the $2000 mark.
My analysis: Technically, the proposal looks flawless and could dramatically lower the entry barrier for validators, which would strengthen decentralization. However, don't expect quick results—implementing such fundamental changes will require years of development and coordination. The question is whether the community will have enough patience to bring this ambitious idea to production without spreading efforts across other priorities.