Charles Hoskinson is pulling no punches. The founder of Cardano has publicly called out Ethereum, accusing it of appropriating a technical architecture that Cardano pioneered — without ever citing its sources.
The controversy erupted after an Ethereum Foundation researcher proposed integrating native UTXOs directly into the Ethereum protocol. A proposal that, according to Hoskinson, bears a striking resemblance to what Cardano has been doing for years.
Behind this war of words lies a deeper technical debate about the future of smart contracts — and about who actually invented what in the blockchain ecosystem.
The Proposal That Sparked the Controversy
It all started with a proposal published by Toni Wahrstätter, a researcher at the Ethereum Foundation, suggesting the introduction of native UTXOs directly at the Ethereum protocol level. The stated goal: to improve transaction predictability and reduce certain friction points associated with Ethereum‘s current account-based model.
As a reminder, Ethereum currently operates on an account-based model, where each address maintains a balance that is updated with every transaction. This model facilitates the programmability of smart contracts, but introduces complexity in terms of parallelization and execution determinism.
In contrast, the UTXO (Unspent Transaction Output) model — popularized by Bitcoin and extended by Cardano in the form of EUTXO — treats each unit of value as a distinct object, consumed and then recreated with each transaction. Cardano enriched this model with scripts and arbitrary data, enabling deterministic and more easily auditable smart contracts.
Hoskinson Speaks Out: “Cardano Did This First”
Charles Hoskinson was quick to respond. On social media, the Cardano founder stated plainly that Ethereum is attempting to adopt the EUTXO model that his team designed and deployed years earlier — without Wahrstätter‘s proposal making any mention of Cardano as a reference or source of inspiration.
This kind of friction between ecosystems is nothing new in the crypto industry. But Hoskinson‘s outburst raises a genuine underlying question: in an open-source sector where code is public and ideas flow freely, where does inspiration end and intellectual plagiarism begin? The line is thin, and the respective communities are far from agreeing on the answer.
On the Ethereum side, no official response has been issued at this stage. Wahrstätter‘s proposal remains exploratory and has not yet been formalized as an EIP (Ethereum Improvement Proposal). It will therefore be worth monitoring how the debate evolves within the Ethereum developer community before knowing whether this direction will actually be pursued.
A Debate That Exposes Architectural Tensions Between Blockchains
Beyond the personal controversy, this episode highlights a structural tension within the blockchain ecosystem: the choice of state management model (account-based vs. UTXO) remains one of the most fundamental trade-offs for any L1. Each approach has its strengths — the account model favors composability for DeFi protocols, while EUTXO offers valuable determinism for security and formal verification.
If Ethereum were to actually integrate a form of native UTXO, it would represent a major architectural shift — potentially comparable in complexity to the transition to Proof-of-Stake. The implications for dApp developers, wallets, and existing DeFi protocols would be considerable, and the Ethereum community is far from having reached a consensus.
For Cardano, this discussion represents a form of indirect validation. The fact that the Ethereum Foundation is exploring this territory suggests that the EUTXO model possesses properties compelling enough to attract the attention of the world’s largest smart contract platform. A tacit acknowledgment — even if Hoskinson would clearly have preferred it to be an explicit one.
