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Johnson Lau

Author of 6 BIPs.

• BIP 114: Merkelized Abstract Syntax Tree: Closed. Proposed MAST, which organizes a script's possible spending conditions into a tree so that only the condition actually used needs to be revealed. This saves space and improves privacy by hiding…
• BIP 141 (SegWit): Segregated Witness (Consensus layer): Deployed. Defines Segregated Witness (SegWit), which moves signatures into a separate "witness" section of each transaction while remaining compatible with older nodes. This fixed transaction malleability,…
• BIP 142: Address Format for Segregated Witness: Closed. Proposed an address format for native SegWit outputs so wallets could send directly to the new transaction types. It was later replaced by the Bech32 address format (BIP 173), which became the…
• BIP 143 (SegWit signature hashing): Transaction Signature Verification for Version 0 Witness Program: Deployed. Changes how signatures are calculated for SegWit transactions so that verifying them no longer requires re-hashing the same data many times. It also makes the signature commit to the amount being…
• BIP 146: Dealing with signature encoding malleability: Closed. Tightens the rules on how digital signatures may be formatted, so a third party cannot slightly alter a signature's encoding and thereby change a transaction's ID. Removing this form of malleability…
• BIP 147 (NULLDUMMY): Dealing with dummy stack element malleability: Deployed. Fixes a quirk in Bitcoin's multisignature opcode, which consumes an extra unused value that anyone could modify without invalidating the transaction. Requiring that value to be empty removes one…