Subject: Re: [bitcoindev] Consensus Cleanup BIP draft

From: Sjors Provoost <[email-masked]>
Date: Fri, 28 Mar 2025 15:07:17 +0100

Hi Chris,

Sorry for the confusion. I meant SegWit.

I believe that 64 byte pre-SegWit transactions are always malleable, because there's no space for a signature in the scriptSig. But with SegWit the scriptSig is empty, there could a SIGHASH_ALL signature in the witness.

- Sjors

> Op 28 mrt 2025, om 14:54 heeft Chris Stewart <[email-masked]> het volgende geschreven:
> 
> Hi Sjors,
> Sorry to be a bit pedantic here, but I think this distinction is important. Are you referring to a pre-SegWit transaction or a SegWit transaction? It’s crucial to analyze these separately, as SegWit was designed to solve transaction malleability, which affects how we assess backward compatibility concerns when disallowing 64-byte transactions.
> In the future, it would be helpful to explicitly specify “pre-segwit” or “segwit” when discussing potential transactions. In my draft BIP, I differentiate between these two types when evaluating the backward compatibility risks of disallowing 64-byte transactions. Additionally, as I mentioned earlier (and as I believe Jeremy has also raised concerns about), there are potential future compatibility issues with segwit transactions.
> I'll take a closer look at the Stack Exchange examples and share my thoughts there when I have a bit of time.
> 

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