Malleability

Transaction malleability fixes. 2 proposals.

BIP 141: 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 147: 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…