Ethereum and data garbage: Buterin warns of growing protocol complexity
Ethereum co-founder Vitalik Buterin warns about the growing complexity of the protocol. In a recent article he calls for systematic “garbage collection”.
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• Vitalik Buterin calls for “garbage collection” for Ethereum protocol
• Ethereum co-founder warns of growing protocol complexity
• Contrast with Solana’s philosophy of continuous evolution
Buterin’s warning: Complexity threatens decentralization
In a post on X on January 18, 2026, Vitalik Buterin called on the Ethereum developer community to address the issue of “protocol bloat.” The co-founder argues that true “trustlessness” and self-sovereignty depend less on pure decentralization metrics and more on the simplicity of the protocol.
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An important, and perenially underrated, aspect of “trustlessness”, “passing the walkaway test” and “self-sovereignty” is protocol simplicity.
Even if a protocol is super decentralized with hundreds of thousands of nodes, and it has 49% byzantine fault tolerance, and nodes fully… pic.twitter.com/kvzkg11M3c
– vitalik.eth (@VitalikButerin) January 18, 2026
Even if a protocol has hundreds of thousands of nodes and has a high level of fault tolerance, it risks ultimately failing if it becomes a confusing jumble of hundreds of thousands of lines of code and complex cryptography. Buterin warns that excessive reliance on “PhD-level cryptography,” i.e. cryptographic methods that only experts understand, threatens the accessibility of Ethereum. The network could transform into a technocratic model instead of remaining a decentralized public good.
The concept of “garbage collection”
To address this problem, Buterin proposes an explicit “simplification” or “garbage collection” feature in Ethereum’s development process. This approach is intended to systematically remove obsolete code and unnecessary dependencies.
The Ethereum co-founder names three specific goals: First, the entire protocol code should be minimized. Secondly, the dependence on complex components should be reduced, with a preference for simpler basic elements such as hash functions. Third, the number of “invariants” should be increased, fixed rules that the protocol can always rely on.
Buterin cites the transition from proof-of-work to proof-of-stake as a successful example of such a cleanup. The most recent gas cost reforms, which link transaction costs more directly to the actual consumption of resources, are also steps towards simplification.
The “Walkaway Test” as a benchmark
A central concept in Buterin’s argument is the so-called “walkaway test.” This measures whether a blockchain could continue to operate safely if its original founders and core researchers permanently left the project. The Ethereum co-founder warns that Ethereum is currently at risk of failing this test because the processes are too complex for new teams to handle without expert guidance.
Buterin’s appeal contrasts with the philosophy of other blockchain projects. As reported by Cointelegraph on January 18, 2026, Solana Labs CEO Anatoly Yakovenko believes that a blockchain that stops evolving to meet developer and user needs risks becoming irrelevant. Buterin, on the other hand, aims for Ethereum to reach a state in the long term where it can function safely and predictably for decades, even without constant developer intervention.
D. Maier / editorial team finanzen.net
