From 8e22af1d0a5de646b8f6cf4e9a78aa5792fcf7a5 Mon Sep 17 00:00:00 2001 From: Johnson Lau Date: Thu, 14 Jan 2016 13:15:10 +0800 Subject: Title change and links update --- bip-0143.mediawiki | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'bip-0143.mediawiki') 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 @@ 
   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 
           Pieter Wuille 
   Status: Draft
@@ -9,7 +9,7 @@
== 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. [https://en.bitcoin.it/wiki/OP_CHECKSIG] @@ -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. [https://github.com/bitcoin/bips/blob/master/bip-0141.mediawiki BIP141: Segregated Witness (Consensus layer)] == 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 == -- cgit v1.2.3