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3 entries
Segregated Witness (SegWit) — Bitcoin's most significant protocol upgrade since creation. Separates signature from transaction data, fixing malleability, enabling Lightning, raising block capacity.
Repurposes the transaction sequence number as a consensus-enforced relative lock-time, letting an input stay unspendable for a set number of blocks or time after its output confirms.
How the Bitcoin ecosystem layers above and around the base chain: Lightning payment channels, federated sidechains, L1 envelope extensions, and mining pool architectures.