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From: Jeff Garzik <jgarzik@gmail.com>
To: Peter Todd <pete@petertodd.org>
Cc: Bitcoin development mailing list <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] Revisiting NODE_BLOOM: Proposed BIP
Date: Fri, 21 Aug 2015 02:01:06 -0400	[thread overview]
Message-ID: <CADm_WcanqF7oHn7huKuYP8iFWmY4XE58tG01M_Nqg9qx6YFu9A@mail.gmail.com> (raw)
In-Reply-To: <20150821055534.GA27259@muck>

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I don't see any link to data backing up "Bloom filter usage has declined
significantly"

Is there actual data showing this feature's use is declining or
non-existent?


On Fri, Aug 21, 2015 at 1:55 AM, Peter Todd <pete@petertodd.org> wrote:

> On Fri, Aug 21, 2015 at 01:48:23AM -0400, Jeff Garzik via bitcoin-dev
> wrote:
> > If this is widely deployed + enabled, what is the impact to current
> wallets
> > in use?
>
> See my comment on the recently-opened issue, reproduced below. In short,
> not all that much, especially if we adopt my suggestion of having the
> Core implementation accept and respond to bloom filter requests from
> non-upgraded clients regardless of whether or not NODE_BLOOM was set
> until some fixed upgrade deadline in the future.
>
>
>     Note that since the last time NODE_BLOOM was proposed, the landcape for
>     (lite-)SPV clients has changed significantly in a few key ways:
>
>     1) @mikehearn's [Cartographer](https://github.com/mikehearn/httpseed)
>     seed protocol has been created and deployed in production to allow
>     (lite-)SPV clients to find nodes supporting arbitrary service bits,
>     notable NODE_GETUTXOs.
>
>     2) Bloom filter usage has declined significantly, as lite-SPV clients
>     are moving towards using centralized, trusted, servers run by the
> wallet
>     authors. For instance
>     [Mycelium](https://github.com/mycelium-com/wallet),
>     [GreenBits](https://github.com/greenaddress/GreenBits),
>     [AirBitz](
> https://www.reddit.com/r/Bitcoin/comments/3etohn/whats_wrong_with_breadwallet/ctirou5
> ),
>     and [Electrum](https://electrum.org/#home) all fall in this category.
>
>     3) Bloom filters [have been found](http://eprint.iacr.org/2014/763) to
>     have severe privacy issues, offering essentially no privacy at all.
>     Under many threat models a small number of trusted servers pose less
>     privacy security risk than connecting to random, sybil-attackable,
> peers
>     using unencrypted connections and giving those peers very accurate
>     wallet contents information.
>
>     4) Finally, Bloom filters still have [unsolved DoS attack
>     issues](
> https://www.reddit.com/r/Bitcoin/comments/3hjak7/the_hard_work_of_core_devs_not_xt_makes_bitcoin/cu9xntf?context=3
> ),
>     that will get significantly worse under upcoming blocksize increase
>     proposals.
>
>     Re: service bit identifier, I'd just pick 1<<3
>
>     -https://github.com/bitcoin/bitcoin/issues/6578#issuecomment-133226943
>
> --
> 'peter'[:-1]@petertodd.org
> 00000000000000000402fe6fb9ad613c93e12bddfc6ec02a2bd92f002050594d
>

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  reply	other threads:[~2015-08-21  6:01 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-08-21  4:46 [bitcoin-dev] Revisiting NODE_BLOOM: Proposed BIP Matt Corallo
2015-08-21  5:38 ` Peter Todd
2015-08-21  5:42   ` Peter Todd
2015-08-21 17:55     ` Matt Corallo
2015-08-21 22:06       ` Peter Todd
2015-08-22  1:08         ` Matt Corallo
2015-08-22  1:48           ` Peter Todd
2015-08-24 15:19         ` Tom Harding
2015-08-24 17:39           ` Matt Corallo
2015-08-22  1:08       ` Matt Corallo
2015-08-21  5:48 ` Jeff Garzik
2015-08-21  5:55   ` Peter Todd
2015-08-21  6:01     ` Jeff Garzik [this message]
2015-08-21  6:07       ` Peter Todd
2015-08-21 22:15         ` Chris Pacia
2015-08-21 22:25           ` Peter Todd
2015-08-21 23:08         ` Tom Harding
2015-08-24 15:21           ` Mike Hearn
2015-08-21  8:31     ` Andreas Schildbach
2015-08-21 17:53   ` Matt Corallo
2015-08-24 15:29 ` Wladimir J. van der Laan
2015-08-24 17:37   ` Matt Corallo
2015-08-24 17:41     ` Wladimir J. van der Laan
2015-08-24 17:58       ` Eric Lombrozo
2015-08-24 18:00     ` Peter Todd
2015-08-24 18:07       ` Matt Corallo
2015-08-24 18:15         ` Eric Lombrozo
2015-08-24 18:28           ` Matt Corallo
2015-08-24 18:30           ` Wladimir J. van der Laan
2015-08-24 18:33             ` Eric Lombrozo

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