Add BIP 66 notice to the 0.10 release notes.v0.10.0rc4

Conflicts:
	doc/release-notes.md

Rebased-From: 04ca082dd9c1d4221af65d945a66b87e66058f92
Github-Pull: #5757

1 files changed, 16 insertions, 0 deletions

diff --git a/doc/release-notes.md b/doc/release-notes.md
index 53a022840c..b70d7eb96d 100644
--- a/doc/release-notes.md
+++ b/doc/release-notes.md
@@ -300,6 +300,22 @@ The relay policy has changed to more properly implement the desired behavior of
 relaying free (or very low fee) transactions unless they have a priority above the 
 AllowFreeThreshold(), in which case they are relayed subject to the rate limiter.
 
+BIP 66: strict DER encoding for signatures
+------------------------------------------
+
+Bitcoin Core 0.10 implements BIP 66, which introduces block version 3, and a new
+consensus rule, which prohibits non-DER signatures. Such transactions have been
+non-standard since Bitcoin v0.8.0 (released in February 2013), but were
+technically still permitted inside blocks.
+
+This change breaks the dependency on OpenSSL's signature parsing, and is
+required if implementations would want to remove all of OpenSSL from the
+consensus code.
+
+The same miner-voting mechanism as in BIP 34 is used: when 751 out of a
+sequence of 1001 blocks have version number 3 or higher, the new consensus
+rule becomes active for those blocks. When 951 out of a sequence of 1001
+blocks have version number 3 or higher, it becomes mandatory for all blocks.
 
 0.10.0 Change log
 =================