On most modern blockchains, transaction data is publicly viewable in the mempool before it is sequenced, executed and confirmed in a block. This transparency creates avenues for sophisticated parties to engage in extractive practices known as Maximal Extractable Value (MEV). MEV exploits the block proposer's ability to reorder, include or omit transactions for financial gain.
MEV is especially notorious on Ethereum, where it continues to be extracted at a rate equivalent to 11% of block rewards. Data shows that nearly $300,000 was lost in sandwich attacks in September. This reveals that MEV is a recurring hidden fee, not a minor inefficiency, hitting large trades hardest in volatile markets.
In the weeks leading up to September 1891, mathematician Georg Cantor prepared an ambush. For years he had sparred - philosophically, mathematically and emotionally - with his formidable rival Leopold Kronecker, one of Germany's most influential mathematicians. Kronecker thought that mathematics should deal only with whole numbers and proofs built from them and therefore rejected Cantor's study of infinity. "God made the integers," Kronecker once said. "All else is the work of man."
Ryan, who had worked for seven years at the Ethereum Foundation (EF), Ethereum's de facto governing body, suggested that Ethereum could be on the cusp of an era-defining shift. Since its founding in 2014, the foundation had prioritized technical upgrades and had avoided centralizing power while its user base was growing, but Ethereum had now grown up, and the cryptocurrency world around it had grown up, too.
This happened in the early 1990s, when I was a young engineer starting an internship at one of the companies that helped create the smart card industry. I believed my card was secure. I believed the system worked. But watching strangers casually extract something that was supposed to be secret and protected was a shock. It was also the moment I realized how insecure security actually is, and the devastating impact security breaches could have on individuals, global enterprises, and governments.