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Expectations for DNS Seed operators
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====================================
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Bitcoin Core attempts to minimize the level of trust in DNS seeds,
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but DNS seeds still pose a small amount of risk for the network.
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As such, DNS seeds must be run by entities which have some minimum
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level of trust within the Bitcoin community.
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Other implementations of Bitcoin software may also use the same
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seeds and may be more exposed. In light of this exposure, this
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document establishes some basic expectations for operating dnsseeds.
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0. A DNS seed operating organization or person is expected to follow good
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host security practices, maintain control of applicable infrastructure,
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and not sell or transfer control of the DNS seed. Any hosting services
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contracted by the operator are equally expected to uphold these expectations.
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1. The DNS seed results must consist exclusively of fairly selected and
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functioning Bitcoin nodes from the public network to the best of the
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operator's understanding and capability.
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2. For the avoidance of doubt, the results may be randomized but must not
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single-out any group of hosts to receive different results unless due to an
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urgent technical necessity and disclosed.
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3. The results may not be served with a DNS TTL of less than one minute.
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4. Any logging of DNS queries should be only that which is necessary
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for the operation of the service or urgent health of the Bitcoin
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network and must not be retained longer than necessary nor disclosed
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to any third party.
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5. Information gathered as a result of the operators node-spidering
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(not from DNS queries) may be freely published or retained, but only
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if this data was not made more complete by biasing node connectivity
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(a violation of expectation (1)).
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6. Operators are encouraged, but not required, to publicly document the
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details of their operating practices.
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7. A reachable email contact address must be published for inquiries
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related to the DNS seed operation.
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If these expectations cannot be satisfied the operator should
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discontinue providing services and contact the active Bitcoin
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Core development team as well as posting on bitcoin-development.
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Behavior outside of these expectations may be reasonable in some
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situations but should be discussed in public in advance.
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See also
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----------
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- [bitcoin-seeder](https://github.com/sipa/bitcoin-seeder) is a reference implementation of a DNS seed.
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