[bitcoin-dev] BIP147 minor error

jl2012 at xbt.hk jl2012 at xbt.hk
Tue Mar 22 06:48:49 UTC 2016

Do you mean BIP141?


Your example is an error by BIP141:


1*4 + 79999*1 = 80003 > 80000


From: bitcoin-dev-bounces at lists.linuxfoundation.org [mailto:bitcoin-dev-bounces at lists.linuxfoundation.org] On Behalf Of Sergio Demian Lerner via bitcoin-dev
Sent: Monday, 21 March, 2016 10:51
To: bitcoin-dev <bitcoin-dev at lists.linuxfoundation.org>
Subject: [bitcoin-dev] BIP147 minor error


The BIP147 reads:

Sigop cost is defined. The cost of a sigop in traditional script is 4, while the cost of a sigop in witness program is 1. 

The new rule is total sigop cost ≤ 80,000. 

But the code implements:

if (nSigOps + (nWitSigOps + 3) / 4 > MAX_BLOCK_SIGOPS)

 ... error....

Which is not the same.

For example:

nSigOps = 1
nWitSigOps =79999

Is not an error by BIP definition but it's an error by the implemented code.

Regards, Sergio.

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