vaults: add Corey Haddad reference

Author: jamesob

bip-vaults.mediawiki

@@ -83,7 +83,7 @@ timelocked coins for perpetuity or relying on a trusted third party.
 [[File:bip-VAULT/vaults-Basic.png|frame|center]]
 
 Vaults in Bitcoin have been discussed formally since 2016
-([http://fc16.ifca.ai/bitcoin/papers/MES16.pdf MES16]) or earlier. The value of
+([http://fc16.ifca.ai/bitcoin/papers/MES16.pdf MES16]) and informally since [https://web.archive.org/web/20160220215151/https://bitcointalk.org/index.php?topic=511881.0 2014]. The value of
 having a configurable delay period with recovery capability in light of an
 unexpected spend has been widely recognized.