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| author | Johnson Lau <jl2012@users.noreply.github.com> | 2016-01-14 13:15:10 +0800 |
|---|---|---|
| committer | Johnson Lau <jl2012@xbt.hk> | 2016-01-19 02:35:54 +0800 |
| commit | 8e22af1d0a5de646b8f6cf4e9a78aa5792fcf7a5 (patch) | |
| tree | 067e03f8e87b3dc1e4fd57ca07cab0cd7bfabc58 /bip-0143.mediawiki | |
| parent | ea49ecb4fbf05b5f9dec3d79cbea47fa35ed27dc (diff) | |
| download | bips-8e22af1d0a5de646b8f6cf4e9a78aa5792fcf7a5.tar.xz | |
Title change and links update
Diffstat (limited to 'bip-0143.mediawiki')
| -rw-r--r-- | bip-0143.mediawiki | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/bip-0143.mediawiki b/bip-0143.mediawiki index 4aca2db..3d7e856 100644 --- a/bip-0143.mediawiki +++ b/bip-0143.mediawiki @@ -1,6 +1,6 @@ <pre> BIP: 143 - Title: Transaction signature verification for version 0 and version 1 witness program + Title: Transaction Signature Verification for Version 0 Witness Program Author: Johnson Lau <jl2012@xbt.hk> Pieter Wuille <pieter.wuille@gmail.com> Status: Draft @@ -9,7 +9,7 @@ </pre> == Abstract == -This proposal defines a new transaction digest algorithm for signature verification in version 0 and version 1 witness program, in order to minimize redundant data hashing in verification, and to cover the input value by the signature. +This proposal defines a new transaction digest algorithm for signature verification in version 0 witness program, in order to minimize redundant data hashing in verification, and to cover the input value by the signature. == Motivation == There are 4 ECDSA signature verification codes in the original Bitcoin script system: CHECKSIG, CHECKSIGVERIFY, CHECKMULTISIG, CHECKMULTISIGVERIFY (“sigops”). According to the sighash type (ALL, NONE, SINGLE, ANYONECANPAY), a transaction digest is generated with a double SHA256 of a serialized subset of the transaction, and the signature is verified against this digest with a given public key. The detailed procedure is described in a Bitcoin Wiki article. <ref name=wiki>[https://en.bitcoin.it/wiki/OP_CHECKSIG]</ref> @@ -22,7 +22,7 @@ Unfortunately, there are at least 2 weaknesses in the original transaction diges Deploying the aforementioned fixes in the original script system is not a simple task. That would be either a hardfork, or a softfork for new sigops without the ability to remove or insert stack items. However, the introduction of segregated witness softfork offers an opportunity to define a different set of script semantics without disrupting the original system, as the unupgraded nodes would always consider such a transaction output is spendable by arbitrary signature or no signature at all. <ref>[https://github.com/bitcoin/bips/blob/master/bip-0141.mediawiki BIP141: Segregated Witness (Consensus layer)]</ref> == Specification == -A new transaction digest algorithm is defined, but only applicable to sigops in version 0 and version 1 witness program: +A new transaction digest algorithm is defined, but only applicable to sigops in version 0 witness program: Double SHA256 of the serialization of: 1. nVersion of the transaction 2. hashPrevouts @@ -122,7 +122,7 @@ As a soft fork, older software will continue to operate without modification. No == Reference Implementation == -https://github.com/sipa/bitcoin/commits/segwit2 +https://github.com/sipa/bitcoin/commits/segwit3 == References == |