Historical retrospective · Ethereum
Istanbul changed gas costs and contract interoperability rules
The December 2019 Istanbul fork included EIPs affecting gas pricing, calldata cost and compatibility for smart contracts.
Such changes can improve resource accounting but may alter assumptions embedded in older contracts.
The fork linked Ethereum’s security economics to the practical work of testing application behavior before activation.
Smart-contract developers need to review protocol upgrades even when their own source code has not changed.
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