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Home Glossary B BIP 102 (2MB Block Size)

BIP 102 (2MB Block Size)

A short-lived proposal to increase Bitcoin’s block size to 2 MB, reflecting earlier scaling contention.
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BIP 102, described in BIP-102, was a straightforward proposal: just double the maximum block size from 1 MB to 2 MB. At the height of the block size debate, some developers believed a simple on-chain capacity boost was the quickest way to scale.

However, this BIP never saw wide acceptance. The community largely favored SegWit (BIP 141) and second-layer solutions like the Lightning Network instead of a hard-coded block size change. BIP 102 is a relic of the turbulent period where different factions had varying visions for Bitcoin’s path to handle more transactions. Eventually, big-block proponents pursued other forks, such as Bitcoin Cash.

Key takeaways
A direct block size doubling proposal
Never implemented due to consensus around SegWit
Reflects the early, heated scaling disputes
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