add more to hip 304

hip-0304.md

@@ -1,3 +1,31 @@
 # HIP304 - z\_signmessage + z\_verifymessage
 
+```
+  HIP: 304
+  Title: Signing and verifying messages from Sapling addresses
+  Author: Duke Leto
+  Category: Standards
+  Created: 2020-02-02
+  License: GPLv3
+```
+
+# Terminology
+
+The key words "MUST", "MUST NOT", and "MAY" in this document are to be interpreted as described in RFC 2119.
+[#RFC2119]
+
+# Abstract
+
+This is an xxx HIP describing signed Sapling messages.
+
+# Motivation
+
 TLDR: Extend the `signmessage` and `verifymessage` RPCs to Sapling shielded addresses.
+
+# Specification
+
+# References
+
+.. [#RFC2119] `Key words for use in RFCs to Indicate Requirement Levels <https://tools.ietf.org/html/rfc2119>`_
+.. [#BIP32] `Hierarchical Deterministic Wallets <https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki>`_
+