From 7a3df9b030d8c16f3081dcd6207bb4d97462b3fe Mon Sep 17 00:00:00 2001
From: Giacomo Pasini <giacomo.pasini@iohk.io>
Date: Tue, 11 Jan 2022 21:45:21 +0100
Subject: [PATCH] make cddl schema backwards compatible

---
 CIP-0015/schema.cddl | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/CIP-0015/schema.cddl b/CIP-0015/schema.cddl
index 6c36eac254..0557a9b5e2 100644
--- a/CIP-0015/schema.cddl
+++ b/CIP-0015/schema.cddl
@@ -8,18 +8,20 @@ $staking_pub_key /= bytes .size 32
 $ed25519_signature /= bytes .size 64
 $reward_address /= bytes
 $nonce /= uint
-$prop /= uint
+$proportion /= uint
 $voting_purpose /= uint
-delegation = (vote_key: $voting_pub_key, proportion: $prop)
+legacy_key_registration = $voting_pub_key
+delegation = ($voting_pub_key, $proportion)
 
 key_registration = {
-  1 : [+delegation],
+  1 : [+delegation] / legacy_key_registration,
   2 : $staking_pub_key,
   3 : $reward_address,
   4 : $nonce,
-  5 : $voting_purpose
+  ? 5 : $voting_purpose .default 0
 }
 
+
 registration_signature = {
   1 : $ed25519_signature
 }