Historical retrospective · Bitcoin
BIP 141 proposed Segregated Witness transaction accounting
BIP 141 defines SegWit’s witness-data structure and a block-weight limit that accounts for signature data differently from the traditional block-size measure.
The design also separates signature data from transaction identifiers, addressing transaction-malleability concerns that complicated second-layer payment channels.
SegWit became a major Bitcoin upgrade after years of technical and community debate, illustrating how consensus changes require broad coordination.
A protocol upgrade can deliver multiple effects at once, but activation debates can be as consequential as the code itself.
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