The concept combined with the weak blocks system where miners commit
to potential transaction inclusion with fractional difficulty blocks
is possible. I'm not personally convinced that unconfirmed transaction
display in a wallet is worth the privacy trade-off. The user has very
little to gain from this knowledge until the txn is in a block.
On 2017-01-01 13:01, Jonas Schnelli via bitcoin-dev wrote:
Hi
We introduce several concepts that rework the lightweight Bitcoin
client model in a manner which is secure, efficient and privacy
compatible.
The BFD can be used verbatim in replacement of BIP37, where the filter
can be cached between clients without needing to be recomputed. It can
also be used by normal pruned nodes to do re-scans locally of their
wallet without needing to have the block data available to scan, or
without reading the entire block chain from disk.
I started exploring the potential of BFD after this specification.
What would be the preferred/recommended way to handle 0-conf/mempool
filtering – if & once BDF would have been deployed (any type,
semi-trusted oracles or protocol-level/softfork)?
From the user-experience perspective, this is probably pretty important
(otherwise the experience will be that incoming funds can take serval
minutes to hours until they appear).
Using BIP37 bloom filters just for mempool filtering would obviously
result in the same unwanted privacy-setup.
</jonas>
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