Re: [bitcoin-dev] Transaction Input/Output Sorting

[rhavar@protonmail.com]

That's pretty easy to quantify. I wrote a quick script to grab the last few blocks, and then shuffle the inputs/outputs before testing if each transaction is bip69 or not.

The result was 42% of all transactions would accidentally be bip69 when randomized.

So clearly randomization is a lot more popular than bip69 at the moment, but I'm not sure that it matters much. As soon as you have more than a few inputs/outputs, you can tell with a high confidence if the transaction is bip69 or not.

And of course if you're clustering a wallet, you can figure out extremely easily how that wallet behaves wrt bip6.


-Ryan

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Wednesday, October 24, 2018 9:12 AM, Gregory Maxwell via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org> wrote:

> On Wed, Oct 24, 2018 at 3:52 PM Chris Belcher via bitcoin-dev
> bitcoin-dev@lists.linuxfoundation.org wrote:
>
> > Thanks for bringing our attention to this important topic.
> > According to (https://p2sh.info/dashboard/db/bip-69-stats) around 60% of
> > transaction follow bip69 (possibly just by chance).
>
> A two input randomly ordered transaction has a 50% chance of
> 'following' bip-69. So 60% sound like a small minority.