Greg Markou, co-founder of Sprinter and former maintainer of web3.js, warns that Ethereum upgrades can break many live applications even if they pass testnet trials. He cites the London hard fork in 2021, where an unnoticed MetaMask-related invariant caused widespread issues for apps relying on web3.js. Markou explains that testnets cannot replicate all real-world interactions on the mainnet, making some edge cases impossible to detect beforehand. This highlights the complexity of Ethereum's network and the challenges in safely deploying protocol changes.
Ethereum upgrades pose testing challenges. For readers following major cryptocurrencies, here is Pluang's market snapshot as of Nov 12, 2026 05:22 WIB: of 50 priced major cryptocurrencies tradable on Pluang, 27 rose and 22 fell today. CRV was priced at Rp4.426 with a 1-day change of -2.23% and Pluang order activity of 0% Sell / 100% Buy. FTM was priced at Rp11.382 with a 1-day change of -2.05%. DOT was priced at Rp15.441 with a 1-day change of +1.95% and Pluang order activity of 23% Sell / 77% Buy.
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