Re: [bitcoin-dev] Bitcoin Core to disable Bloom-based Filtering by default

From: Matt Corallo <lf-lists@mattcorallo•com>
To: Will Madden <will.madden@bridge21•com>
Cc: Bitcoin Protocol Discussion <bitcoin-dev@lists•linuxfoundation.org>
Subject: Re: [bitcoin-dev] Bitcoin Core to disable Bloom-based Filtering by default
Date: Wed, 14 Aug 2019 11:07:19 -0400	[thread overview]
Message-ID: <C345325B-D0DE-42FD-849E-5DEF4BBC3C59@mattcorallo.com> (raw)
In-Reply-To: <FF0175BF-1D1F-4AD4-9B13-99D522DBCD83@bridge21.com>

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You very clearly didn't bother to read other mails in this thread. To make it easy for you, here's a few links:
https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2019-July/017147.html
https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2019-July/017175.html

Matt

> On Aug 13, 2019, at 23:05, Will Madden <will.madden@bridge21•com> wrote:
> 
> For the record, strong NACK. My understanding is that this breaks several established SPV implementations (such as early breadwallet for sure and possibly current BRD wallets) and I have yet to see quantitative prioritization or even a rational justification for this change.
> 
> Requiring SPV wallets to communicate with trusted nodes is centralization, and breaking functionality and implementations that enable this without a thoroughly researched rationale is highly suspect.
> 
>> On Jul 20, 2019, at 1:46 PM, Matt Corallo via bitcoin-dev <bitcoin-dev@lists•linuxfoundation.org> wrote:
>> 
>> Just a quick heads-up for those watching the list who may be using it -
>> in the next Bitcoin Core release bloom filter serving will be turned off
>> by default. This has been a long time coming, it's been an option for
>> many releases and has been a well-known DoS vector for some time.
>> As other DoS vectors have slowly been closed, this has become
>> increasingly an obvious low-hanging fruit. Those who are using it should
>> already have long been filtering for NODE_BLOOM-signaling nodes, and I
>> don't anticipate those being gone any time particularly soon.
>> 
>> See-also PR at https://github.com/bitcoin/bitcoin/pull/16152
>> 
>> The release notes will liekly read:
>> 
>> P2P Changes
>> -----------
>> - The default value for the -peerbloomfilters configuration option (and,
>> thus, NODE_BLOOM support) has been changed to false.
>> This resolves well-known DoS vectors in Bitcoin Core, especially for
>> nodes with spinning disks. It is not anticipated that
>> this will result in a significant lack of availability of
>> NODE_BLOOM-enabled nodes in the coming years, however, clients
>> which rely on the availability of NODE_BLOOM-supporting nodes on the
>> P2P network should consider the process of migrating
>> to a more modern (and less trustful and privacy-violating) alternative
>> over the coming years.
>> 
>> Matt
>> _______________________________________________
>> bitcoin-dev mailing list
>> bitcoin-dev@lists•linuxfoundation.org
>> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev

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