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authorjl2012 <jl2012@xbt.hk>2016-04-08 23:45:54 +0800
committerjl2012 <jl2012@xbt.hk>2016-04-09 03:13:37 +0800
commitee744caca9dce9717b221a60c92f0d0e414db625 (patch)
treeac382dc8ddc702a601235d62d92271d658c6eb70 /bip-0141.mediawiki
parent4cdb00287db2be1e40f87de8ec46c393471f6500 (diff)
downloadbips-ee744caca9dce9717b221a60c92f0d0e414db625.tar.xz
BIP141: commitment clarification. BIP144: new diagram
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@@ -75,6 +75,8 @@ and the coinbase's input's witness must consist of a single 32-byte array for th
If there are more than one scriptPubKey matching the pattern, the one with highest output index is assumed to be the commitment.
+If all transactions in a block do not have witness data, the commitment is optional.
+
=== Witness program ===
A scriptPubKey (or redeemScript as defined in BIP16/P2SH) that consists of a 1-byte push opcode (for 0 to 16) followed by a data push between 2 and 32 bytes gets a new special meaning. The value of the first push is called the "version byte". The following byte vector pushed is called the "witness program".