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+<a id="rend-spec-v3.txt-E"></a>
+
+# Appendix E: Reserved numbers
+
+We reserve these certificate type values for Ed25519 certificates:
+
+```text
+ [08] short-term descriptor signing key, signed with blinded
+ public key. (Section 2.4)
+ [09] intro point authentication key, cross-certifying the descriptor
+ signing key. (Section 2.5)
+ [0B] ed25519 key derived from the curve25519 intro point encryption key,
+ cross-certifying the descriptor signing key. (Section 2.5)
+
+ Note: The value "0A" is skipped because it's reserved for the onion key
+ cross-certifying ntor identity key from proposal 228.
+```