[bitcoin-dev] BloomFilter issue with segwit addresses

[Andreas Schildbach]

Yes, I guess the quicker filter exhaustion must be the reason why
bitcoinj doesn't make use of outpoints in filters for standard
transactions. I'll look into if I can change that.


On 04/14/2018 06:14 PM, Christian Decker via bitcoin-dev wrote:
> Note that this would compound the privacy leak that Jonas Nick used to
> identify address clusters via the bloom filters in one of his
> publications. By reducing the false positives when matching you can get
> very detailed clusters. Then again we know that bloom filters aren't
> good for privacy anyway, so this might be a non-issue.
> 
> On Sat, Apr 14, 2018, 00:17 Jim Posen via bitcoin-dev
> <bitcoin-dev at lists.linuxfoundation.org
> <mailto:bitcoin-dev at lists.linuxfoundation.org>> wrote:
> 
>     Why not add the outpoints owned by the wallet to the filter and
>     watch for those instead of elements in the input script or witness data?
> 
>     On Fri, Apr 13, 2018 at 12:12 PM, Jonas Schnelli via bitcoin-dev
>     <bitcoin-dev at lists.linuxfoundation.org
>     <mailto:bitcoin-dev at lists.linuxfoundation.org>> wrote:
> 
>         Hi Andreas
> 
>         Thanks for bringing this up and this seems indeed to be suboptimal.
> 
>         > I wonder if Bitcoin Core would be willing to extend the BIP37 matching
>         > rules such that data elements in the witness are also matched against?
> 
>         Bitcoin Core is not an identity that can be „willing to extend“
>         (or reject) a feature.
>         Someone needs to come up with a proposal (pull request).
> 
>         Maybe an extension for BIP37 would make sense (*meh*).
>         Just inserting the witness data into the bloom filter seems to
>         be an easy solution (CBloomFilter::IsRelevantAndUpdate())
> 
>         /jonas
> 
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