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Validation

Validation improvements. 7 proposals.

• BIP 34: Block v2, Height in Coinbase: Deployed. Upgraded blocks to version 2 and required each block's coinbase transaction (the one paying the miner) to include the block's height. This makes every coinbase unique, preventing duplicate…
• BIP 42: A finite monetary supply for Bitcoin: Deployed. A tongue-in-cheek proposal fixing a software quirk that would have made the block reward reappear and coin issuance restart a couple of centuries from now. It ensures the roughly 21 million coin…
• BIP 62: Dealing with malleability: Closed. Proposed a set of rules to stop third parties from altering a transaction's ID without changing what it does, a problem called malleability. It was withdrawn after Segregated Witness (SegWit) solved…
• BIP 143: 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 144: Segregated Witness (Peer Services): Deployed. Specifies the network messages nodes use to pass SegWit transactions and blocks to one another, including the separate signature data. It lets upgraded nodes share full witness data while older…
• 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 342: Validation of Taproot Scripts: Deployed. Specifies Tapscript, the updated scripting rules used when a Taproot output is spent through one of its hidden alternative conditions. It switches signature checks to Schnorr, removes some old…