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+# Proposal
+
+Replace the "domain_hint" key in the input to the add-leaf endpoint with
+"rate-limit". The value associated with the "rate-limit" key is on the format:
+
+ method:data
+
+where the defined methods are:
+
+ - dns: the exact same semantics as today's domain hint
+ - token: a shared secret that is negotiated between submitter and the log
+ operator out-of-band
+
+Example of a rate-limit line using DNS:
+
+ rate_limit=dns:_sigsum_v0.example.org
+
+Example of a rate-limit line using token:
+
+ rate_limit=token:xxxxxxxxxxxxxxxxxxxxxx
+
+The "rate_limt" key must not be repeated.
+
+The "rate_limit" key may be omitted. It is then up to the log server to accept
+or reject the user's requests.
+
+# Motivation
+
+There are more ways to establish something to rate-limit on than domain hints.
+The name "domain_hint" is also not descrptive; it makes understanding harder.
+
+It is also plausible that a log operator wants to run without a rate limit in
+some environments. The above change permits this as well.