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Update BIP 141 to include definition of Virtual transaction size and Transaction weight #1

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Sep 22, 2016
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Update BIP 141 to include definition of Virtual transaction size and Transaction weight #1

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14 changes: 14 additions & 0 deletions bip-0141.mediawiki
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Expand Up @@ -125,6 +125,20 @@ The sigop limit is likewise quadrupled to ≤ 80,000.

Each P2WPKH input is counted as 1 sigop. In addition, opcodes within a P2WSH <code>witnessScript</code> are counted identically as previously within the P2SH <code>redeemScript</code>. That is, CHECKSIG is counted as only 1 sigop, and CHECKMULTISIG is counted as 1 to 20 sigops according to the arguments. This rule applies to both native witness program and P2SH witness program.

=== Additional definitions ===

The following definitions are not used for consensus limits, but are suggested to provide language consistent with the terminology introduced above.

==== Transaction size calculations ====

''Transaction weight'' is defined as ''Base transaction size'' * 3 + ''Total transaction size'' (ie. the same method as calculating ''Block weight'' from ''Base size'' and ''Total size'').

''Virtual transaction size'' is defined as ''Transaction weight'' / 4 (rounded up to nearest integer).

''Base transaction size'' is the transaction size in bytes with the original transaction serialization without any witness-related data.

''Total transaction size'' is the transaction size in bytes serialized as described in [[bip-0144.mediawiki|BIP144]], including base data and witness data.

== Examples ==

=== P2WPKH ===
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