A study published Wednesday in Nature demonstrates a method for passively monitoring heart rate through tiny skin-colour changes during regular phone use. That alone is a neat bio-hacking trick. But buried in the same paper is a test of Richard Feynman’s solution to the ‘restaurant dilemma’ — a cooperative game theory problem that could translate directly to blockchain design.
What the study actually found
The researchers showed that a phone’s front-facing camera can detect subtle shifts in skin colour caused by blood flow, and from that extract a reliable heart-rate reading without the user doing anything special. It’s passive, works during normal screen time, and could eventually flag early signs of arrhythmia or other health issues. Nature published the findings on 3 June 2026.
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The health-tracking angle is straightforward. The game-theory angle is what caught our attention.
The restaurant dilemma, Feynman style
The restaurant dilemma is a classic coordination problem: a group of diners must decide how to split a bill fairly when some ordered cheap dishes and others expensive ones. Feynman’s solution involves a cooperative strategy that incentivises truthful reporting without a central arbiter. The study tested this approach in a controlled setting and found it works — participants who used the strategy reached fairer outcomes more often than those who didn’t.
Why should a crypto reporter care? Because the same incentive-alignment problem shows up every day in DeFi.
Miner extractable value — MEV — is the blockchain version of the restaurant dilemma. When users submit transactions, validators can reorder them to capture profits, a practice that leads to front-running and sandwich attacks. The result is a system that penalises honest traders. Feynman’s cooperative strategy, if encoded into smart contracts, could create fee structures that discourage such behaviour by aligning validator incentives with user fairness.
The paper doesn’t mention blockchain. But the mathematical framework is directly transferable. A DeFi protocol that implements a Feynman-style fee mechanism could theoretically reduce MEV without relying on centralised sequencers. That’s a potential breakthrough for protocols struggling with the fairness problem.
What’s next
The Nature publication is a proof of concept for both the health monitoring and the game theory. No one is shipping a MEV-resistant order book tomorrow. But the research signals that academic mathematicians are actively working on cooperative optimisation — and that the same methods could apply to blockchain consensus. Watch for follow-up papers from this group or for DeFi teams citing Feynman’s restaurant dilemma in their next white paper.
