[Bitcoin-development] bloom filtering, privacy

Chris Pacia ctpacia at gmail.com
Sat Feb 21 16:03:53 UTC 2015


Adam seems to be making sense to me. Only querying a single node when an
address in my wallet matches the block filter seems to be pretty
efficient. The downside is it relies entirely on Tor for privacy, but
then again it's not the only aspect of spv clients that require it for
privacy (there's broadcasting for example).

And on a related note, if we eventually do end up receiving bip70
payments directly, we still need to query for block inclusion and that
would seem to be an easy way to do it.

On 02/20/2015 12:53 PM, Mike Hearn wrote:
>
>     This is talking about a committed bloom filter. Not a committed
>     UTXO set.
>
>
> I read the following comment to mean it requires the UTXO commitments.
> Otherwise I'm not sure how you prove absence of withholding with just
> current block structures+an extra filter included in the block:
>
>     but with the bloom commitment (and UTXO trie organised commitment) he
>     can verify that the positive hits are correct via the merkle path, and
>     that the false positives are not being wrongly withheld by obtaining
>     merkle path proof that they are not in the trie 
>
>
>
>
>
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