Hoskinson Calls Ethereum's UTXO Flirtation a 'Crime' Against Credit

Cardano founder Charles Hoskinson has accused Ethereum of quietly borrowing the Extended Unspent Transaction Output (eUTXO) design he says he spent more than a decade building, claiming that acknowledging Cardano inside the Ethereum ecosystem remains taboo. His remarks followed an Ethereum Foundation proposal published this week by researcher Toni Wahrstätter that would treat simple Ethereum payments as one-time "frame transactions" proven from chain history, leaving only a single spent marker in active state. The draft sits under EIP-8141, a standard credited in part to Vitalik Buterin, and has been routed to Ethereum's Strawman discussion track.

Wahrstätter's proposal targets a longstanding pain point in Ethereum's account-based architecture: every first payment to an address writes a permanent state entry, even for balances unlikely to be touched again. Under the proposed design, basic Layer-1 transfers would no longer create lasting accounts, cutting redundant state growth by roughly 99.8%, according to the author's figures. A fresh account entry occupies about 100 to 150 bytes, while a native UTXO-style footprint leaves approximately 0.3 bytes behind. The pitch lands while Buterin promotes a separate "Lean Ethereum" roadmap with a similar weight-reduction theme.

Hoskinson, a co-founder of Ethereum who departed in 2014 after a public disagreement with Buterin over the network's commercial direction, responded on X on July 7, 2026. "It's not like I've been literally working on this topic for over 10 years of my life and launched a cryptocurrency that was number three on coinmarketcap with millions of users to deploy it," he wrote, adding that "EUTXO is the biggest innovation of the smart contract world and Ethereum cannot mention it as they literally try to copy it," and that "it's literally a crime in the Ethereum inner circles to mention Cardano." Bitcoin ($BTC) pioneered the underlying UTXO model but lacks smart-contract capability, and Cardano adapted that structure into eUTXO to support complex applications.

The technical contrast frames the dispute. Cardano's blockchain was engineered around eUTXO from the outset, tracking funds as discrete unspent outputs instead of mutable account balances. Ethereum has run on the opposite, account-oriented system since launch, and merging UTXO elements into an active DeFi environment introduces compatibility considerations for existing applications. The result is a choice for Ethereum developers: tolerate continued state bloat, or adopt a hybrid mechanism that effectively ratifies an approach competitors deployed years earlier.

Market reaction to the public clash was muted. $ADA traded near $0.17 with a 12.5% weekly gain, according to BeInCrypto Markets data, and ranks 18th by market capitalization, well below the third-place spot Hoskinson referenced. $ETH changed hands at $1,754 with a market cap of $211 billion, second overall.