[bitcoin-dev] Committed bloom filters for improved wallet performance and SPV security

[Aaron Voisine]

Unconfirmed transactions are incredibly important for real world use.
Merchants for instance are willing to accept credit card payments of
thousands of dollars and ship the goods despite the fact that the
transaction can be reversed up to 60 days later. There is a very large cost
to losing the ability to have instant transactions in many or even most
situations. This cost is typically well above the fraud risk.

It's important to recognize that bitcoin serves a wide variety of use cases
with different profiles for time sensitivity and fraud risk.

Aaron

On Tue, Jan 3, 2017 at 12:41 PM bfd--- via bitcoin-dev <
bitcoin-dev at lists.linuxfoundation.org> wrote:

> 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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>
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>
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>
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>
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>
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>
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>
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