SegWit separated transaction witness data from the legacy transaction identifier calculation, addressed unwanted malleability, and introduced a weight-based capacity model. The code’s release did not itself activate the rules; deployment still required the specified BIP 9 signaling threshold.
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Bitcoin Core v0.13.1 ships SegWit activation parameters
Bitcoin Core v0.13.1 included validation and miner-signaling support for the Segregated Witness soft fork.