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Return-Path: <jl2012@xbt.hk>
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Date: Wed, 24 Aug 2016 21:49:34 -0400 (EDT)
From: Johnson Lau <jl2012@xbt.hk>
Reply-To: Johnson Lau <jl2012@xbt.hk>
To: Sergio Demian Lerner <sergio.d.lerner@gmail.com>,
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Subject: Re: [bitcoin-dev] Attack by modifying non-segwit transactions after
segwit is accepted ?
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Adding witness data to a non-segwit script is invalid by consensus:
https://github.com/bitcoin/bitcoin/blob/d612837814020ae832499d18e6ee5eb919a87907/src/script/interpreter.cpp#L1467
This PR will detect such violation early and ban the peer:
https://github.com/bitcoin/bitcoin/pull/8499
Another approach is to run the scripts of all incoming transactions. That's not too bad as you have already fetched the utxos which is a major part of validation.
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</head><body><p>Adding witness data to a non-segwit script is invalid by consensus:</p><p><a href="https://github.com/bitcoin/bitcoin/blob/d612837814020ae832499d18e6ee5eb919a87907/src/script/interpreter.cpp#L1467">https://github.com/bitcoin/bitcoin/blob/d612837814020ae832499d18e6ee5eb919a87907/src/script/interpreter.cpp#L1467</a></p><p><br></p><p>This PR will detect such violation early and ban the peer:</p><p><a href="https://github.com/bitcoin/bitcoin/pull/8499">https://github.com/bitcoin/bitcoin/pull/8499</a></p><p></p><p><br></p><p>Another approach is to run the scripts of all incoming transactions. That's not too bad as you have already fetched the utxos which is a major part of validation.</p></body></html>
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