Bitcoin Dev Archive / 2012 OP_RESEVERVED and IsPushOnly 1 message, 26 Jul 2012. Started by Amir Taaki. Amir Taaki Script and opcodes Permalink | Original thread on gnusha.org Amir Taaki 26 Jul 2012, 16:49 UTC permalink original Meh, probably harmless, but... As best I can tell, OP_RESERVED does absolutely nothing (a NOP). CScript::IsPushOnly(...) counts this as a push operation.