From de694d4509c0652714f6976458394918438479ff Mon Sep 17 00:00:00 2001
From: str4d <jack@electriccoin.co>
Date: Fri, 19 Mar 2021 11:28:50 +1300
Subject: [PATCH] Final changes to remove undecided parts of the draft

---
 zip-0302.rst | 27 +++++++--------------------
 1 file changed, 7 insertions(+), 20 deletions(-)

diff --git a/zip-0302.rst b/zip-0302.rst
index 183f3d4d..0be9d67b 100644
--- a/zip-0302.rst
+++ b/zip-0302.rst
@@ -44,27 +44,14 @@ contents of a memo. It does not define consensus requirements.
      + strip any trailing zero bytes
      + decode it as a UTF-8 string (if decoding fails then report an error).
 
-+ If the first byte has a value of 0xF5, then the reader MUST:
-     + Interpret the next few bytes (1 to 9 of them) as a 64-bit unsigned variable-length
-       integer [#Bitcoin-CompactSize]_, and use it as an arbitrary application-defined
-       "type" field.
-     + Interpret the next 1 or 2 bytes as a CompactSize value constrained to the range 0..510, and use 
-       the resulting value as the length of the remaining data.
-     + If 1 + the number bytes used for the type field + the number of bytes used for the
-       length field + the length > 512 then report an error.
-     + Inspect the padding after the end of the indicated length, and if it
-       contains anything other than bytes of value 0x00 then report an error.
-     + Return to the caller a 3-tuple of the following data:
-           + the type — an integer in :math:`[0...2^{64})`
-           + the length — an integer in :math:`[0...510)`
-           + a byte string of that length that contains the payload
++ If the first byte has a value of 0xF6, and the remaining 511 bytes are 0x00, then the user
+  supplied no memo, and the encrypted memo field is to be treated as empty.
 
-+ If the first byte has a value of 0xF6, then the user supplied no memo, and the encrypted
-  memo field is to be treated as empty.
-
-+ If the first byte has a value between 0xF7 and 0xFE inclusive, then this memo is from
-  the future, because first byte values of 0xF7–0xFE are reserved for future
-  specifications of this protocol.
++ If the memo matches any of these patterns, then this memo is from the future, because
+  these ranges are reserved for future updates to this specification:
+  - The first byte has a value of 0xF5.
+  - The first byte has a value between 0xF7 and 0xFE inclusive.
+  - The first byte has a value of 0xF6, and the remaining 511 bytes are not all 0x00.
 
 + If the first byte has a value of 0xFF then the reader should not make any other
   assumption about the memo. In order to put data into a memo field that does not use the