Historical retrospective · Ethereum
Constantinople refined Ethereum execution and delayed the difficulty bomb
Constantinople activated in February 2019, changing gas costs and EVM behavior while reducing the block reward and postponing the difficulty bomb.
The release balanced efficiency changes with a schedule adjustment for the still-planned proof-of-stake transition.
It was part of Ethereum’s long series of incremental steps toward a different consensus model.
Roadmaps can shift; a difficulty-bomb delay is a governance and coordination tool, not proof that a transition date is guaranteed.
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