On 2017-02-17 11:28, Chris Belcher via bitcoin-dev wrote:
I think this committed bloom filter idea is very good and much better
than bip37, but for good privacy for when bitcoin is used often still
requires certain behavior namely downloading blocks
from many different peers with new tor circuits.
Note that I've been dealing with counting transaction subgraphs but
actually finding them from blocks might also be computationally
infeasible. Although a Bayesian approach worked very
well for similar transaction subgraph linking
[https://arxiv.org/pdf/1612.06747v3.pdf]
It would also be interesting to analyze what information a spy can get
if they are missing some blocks that the wallet downloaded.
For the long term, private and high-volume bitcoin use will be best
served by off-chain transactions. They will probably be a huge win just
because the large and public blockchain is such a non-private
way of doing things.
Thank you for the analysis, this generally matches my views about the
properties offered by the system.
I've generally developed the opinion that BIP37 is effectively unused
by all but a very small number of wallets and services now, setting up
sinkhole nodes in the network to monitor `filterload` commands seems
to back that up.
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