[Bitcoin-development] Policy for DNS seeds

Christian Decker decker.christian at gmail.com
Mon Jul 21 13:53:51 UTC 2014

How about research projects into node distribution? Specifically I
wonder whether the collection and analysis of DNS query origin is
allowed when queries are anonymized and aggregated. This would prevent
the identification of a single user, which I assume is the rationale
for point 4.

Other than that I'm perfectly fine with accepting the rules for

Christian Decker

On Mon, Jul 21, 2014 at 2:43 PM, Wladimir <laanwj at gmail.com> wrote:
> We've established a few basic rules for the DNS seeds as used in the
> Bitcoin Core software. See below.
> If you run one of the DNS seeds please reply to this and let us know
> whether you agree to these terms. if you think some requirements are
> unreasonable let us know too. If we haven't heard from you by
> 2014-08-04 we will remove your DNS seed from the list of defaults.
> Expectations for DNSSeed operators
> ====================================
> Bitcoin Core attempts to minimize the level of trust in DNS seeds,
> but DNS seeds still pose a small amount of risk for the network.
> Other implementations of Bitcoin software may also use the same
> seeds and may be more exposed. In light of this exposure this
> document establishes some basic expectations for the expectations
> for the operation of dnsseeds.
> 0. A DNSseed operating organization or person is expected
> to follow good host security practices and maintain control of
> their serving infrastructure and not sell or transfer control of their
> infrastructure. Any hosting services contracted by the operator are
> equally expected to uphold these expectations.
> 1. The DNSseed results must consist exclusively of fairly selected and
> functioning Bitcoin nodes from the public network to the best of the
> operators understanding and capability.
> 2. For the avoidance of doubt, the results may be randomized but must not
> single-out any group of hosts to receive different results unless due to an
> urgent technical necessity and disclosed.
> 3. The results may not be served with a DNS TTL of less than one minute.
> 4. Any logging of DNS queries should be only that which is necessary
> for the operation of the service or urgent health of the Bitcoin
> network and must not be retained longer than necessary or disclosed
> to any third party.
> 5. Information gathered as a result of the operators node-spidering
> (not from DNS queries) may be freely published or retained, but only
> if this data was not made more complete by biasing node connectivity
> (a violation of expectation (1)).
> 6. Operators are encouraged, but not required, to publicly document
> the details of their operating practices.
> 7. A reachable email contact address must be published for inquiries
> related to the DNSseed operation.
> If these expectations cannot be satisfied the operator should
> discontinue providing services and contact the active Bitcoin
> Core development team as well as posting on bitcoin-development.
> Behavior outside of these expectations may be reasonable in some
> situations but should be discussed in public in advance.
> ========
> See
> https://github.com/bitcoin/bitcoin/pull/4566
> Wladimir

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