From ec84e81e8383b3b1e1ef4a6dbcb088193d8de5d7 Mon Sep 17 00:00:00 2001
From: Pieter Wuille <sipa@ulyssis.org>
Date: Mon, 24 Jun 2013 20:51:08 +0200
Subject: Prune provably-unspendable outputs

---
 src/script.h | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'src/script.h')

diff --git a/src/script.h b/src/script.h
index 03afe8b652..2dc0697ade 100644
--- a/src/script.h
+++ b/src/script.h
@@ -548,6 +548,13 @@ public:
         return true;
     }
 
+    // Returns whether the script is guaranteed to fail at execution,
+    // regardless of the initial stack. This allows outputs to be pruned
+    // instantly when entering the UTXO set.
+    bool IsUnspendable() const
+    {
+        return (size() > 0 && *begin() == OP_RETURN);
+    }
 
     void SetDestination(const CTxDestination& address);
     void SetMultisig(int nRequired, const std::vector<CPubKey>& keys);
-- 
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