To: bitcoin-dev@lists.linuxfoundation.org
References: <201608232012.12588.luke@dashjr.org>
	<7FF3E128-4D92-46CC-8FBA-9B9E9A9FC7AD@keepkey.com>
From: Jonas Schnelli <dev@jonasschnelli.ch>
Message-ID: <57BD45EC.1090000@jonasschnelli.ch>
Date: Wed, 24 Aug 2016 08:59:56 +0200
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Subject: Re: [bitcoin-dev] BIP Status updates (including to Active/Final
 Status) - BIP 39, BIP 43, BIP 44, BIP 67, BIP 111, BIP 125, BIP 130
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From: Jonas Schnelli <dev@jonasschnelli.ch>
To: bitcoin-dev@lists.linuxfoundation.org
Message-ID: <57BD45EC.1090000@jonasschnelli.ch>
Subject: Re: [bitcoin-dev] BIP Status updates (including to Active/Final
 Status) - BIP 39, BIP 43, BIP 44, BIP 67, BIP 111, BIP 125, BIP 130
References: <201608232012.12588.luke@dashjr.org>
 <7FF3E128-4D92-46CC-8FBA-9B9E9A9FC7AD@keepkey.com>
In-Reply-To: <7FF3E128-4D92-46CC-8FBA-9B9E9A9FC7AD@keepkey.com>

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>> Additionally, BIP 111 (NODE_BLOOM service bit) has been implemented in=
 Bitcoin
>> Core and derivatives; it is unclear if used by clients yet. Can develo=
pers of
>> such clients please comment and let me know: 1) if their software supp=
orts
>> this BIP already; 2) if not, do they intend to support it in the futur=
e?
>> If and only if there are any clients using this service bit already, I=
 will
>> update BIP 111 to Final Status in 2 weeks also.
>=20
> Multibit is adding detection of the NODE_BLOOM bit in the next 2-3 week=
s.
>=20
> SPV is kinda broken if the wallet doesn=92t do this detection. If your =
wallet connects only to nodes that don=92t support bloom filtering, the w=
allet never gets updates. We have had a spike in users reporting that the=
ir wallet isn't getting updated. To compound the problem, they rescan the=
 blockchain and lose all of their transaction history. It has caused much=
 panic among less technical users.
>=20
> We believe that failing to detect the NODE_BLOOM bit is the culprit, al=
though it is non-deterministic, so we aren't certain.
>=20
> I imagine that other SPV wallets are having similar issues. BIP 111 rea=
lly isn=92t optional at this point, so it should be marked final.

SPV Wallets should definitively update to respect NODE_BLOOM. Bloom
filtering is CPU and disk intense and some node operators have disabled
it (or will disabled it) because there is no direct p2p network-health
benefit.

SPV wallets should probably also make use of the new DNS seeder filter
option.
It is running at least on seed.bitcoin.sipa.be and
seed.bitcoin.jonasschnelli.ch.

The filter option allows SPV Wallets to only get nodes that signal
support for NODE_BLOOM.

The syntax is

   x<networkservice_flags_filter_as_int>.seed.bitcoin....

Example for NODE_NETWORK together with NODE_BLOOM
dig x5.seed.bitcoin.jonasschnelli.ch
(NETWORK =3D (1 << 0), NODE_BLOOM =3D (1 << 2)) =3D (bin00000101 =3D (int=
)5)


</jonas>


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