Historical retrospective · Ethereum
Byzantium delivered the first part of Ethereum’s Metropolis roadmap
Byzantium activated in October 2017 and introduced several EVM and protocol changes, including new opcodes and updates to block rewards.
The upgrade advanced programmability while adjusting the network’s planned transition path.
It showed how a named fork can bundle multiple EIPs into one network-wide compatibility event.
Bundled upgrades simplify deployment cadence but require developers to test contracts against the whole rule set, not one headline feature.
Primary source
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