diff -uNr a/bitcoin/src/init.cpp b/bitcoin/src/init.cpp
--- a/bitcoin/src/init.cpp 7a171c2f30805f207ae170404f2f684144c254a13f4f25581146611c38313b2bb1b3cd6347c0ce9b66c313e0004eac66b04e83b431ec78910f5aabb0de341043
+++ b/bitcoin/src/init.cpp ff7009f672bf400a42d1d7afb6e58aaf1c29d9c219fad51c5f17000243a485e92bbb250d3f4bbec3f0717d00fad620c294d537832671f20c0979fb3f1383779b
@@ -174,6 +174,7 @@
             "  -daemon          \t\t  " + _("Run in the background as a daemon and accept commands\n") +
             "  -debug           \t\t  " + _("Output extra debugging information\n") +
 	    "  -caneat          \t\t  " + _("Permit the use of 'eatblock'\n") +
+	    "  -verifyall       \t\t  " + _("Forbid the skipping of ECDSA signature verification between checkpoints.\n") +
             "  -logtimestamps   \t  "   + _("Prepend debug output with timestamp\n") +
             "  -printtoconsole  \t  "   + _("Send trace/debug info to console instead of debug.log file\n") +
             "  -rpcuser=<user>  \t  "   + _("Username for JSON-RPC connections\n") +
@@ -196,6 +197,7 @@
     fDebug = GetBoolArg("-debug");
     fDaemon = GetBoolArg("-daemon");
     fCanEat = GetBoolArg("-caneat");
+    fVerifyAll = GetBoolArg("-verifyall");
 
     if (fDaemon)
         fServer = true;
diff -uNr a/bitcoin/src/main.cpp b/bitcoin/src/main.cpp
--- a/bitcoin/src/main.cpp f55521ae4e41e386b5a5b839c778b27317eb67b98d8fc502adbf46f8d2e68236d03d48c9509de6b90ef64ecb976cbab4bc24bfd114962c75db927d369c9122d6
+++ b/bitcoin/src/main.cpp 92038390413f77b55e19439738e87c21bd5b2313dc6edad78bcc8bf722dde82623a31a56a87b0182e75e6824fc709dc216fb9cb159b49a16e212e3a5ded93f58
@@ -832,7 +832,7 @@
             // Skip ECDSA signature verification when connecting blocks (fBlock=true)
             // before the last blockchain checkpoint. This is safe because block merkle hashes are
             // still computed and checked, and any change will be caught at the next checkpoint.
-            if (!(fBlock && (nBestHeight < Checkpoints::GetTotalBlocksEstimate())))
+            if (fVerifyAll || (!(fBlock && (nBestHeight < Checkpoints::GetTotalBlocksEstimate()))))
                 // Verify signature
                 if (!VerifySignature(txPrev, *this, i))
                     return DoS(100,error("ConnectInputs() : %s VerifySignature failed", GetHash().ToString().substr(0,10).c_str()));
diff -uNr a/bitcoin/src/util.cpp b/bitcoin/src/util.cpp
--- a/bitcoin/src/util.cpp e2cc1d21c90f28e0475d0801c80c81adddecf1464925c0cde2a5b004e3e26d6917d7224453fb814f62f85d566f377518501fb7e825f173c901da590491fad9c5
+++ b/bitcoin/src/util.cpp 3dcfe5f29728dcd34a6dfe23e9cd17e5f4a332a8d2e7444355106c8c63436cf54892424df2018756c2e109463fd87728fc668a5a03914a4aa3f30bb90403b433
@@ -21,6 +21,7 @@
 bool fPrintToConsole = false;
 bool fPrintToDebugger = false;
 bool fCanEat = false;
+bool fVerifyAll = false;
 char pszSetDataDir[MAX_PATH] = "";
 bool fRequestShutdown = false;
 bool fShutdown = false;
diff -uNr a/bitcoin/src/util.h b/bitcoin/src/util.h
--- a/bitcoin/src/util.h d88425cb5b70d7df2a60d174f99347b3ac00f0a7f17227bd9944f22ffaa3772389989c00c14135fbbb121fe3cb5b68c51eb1120ce214d3732b354c580d1f2fec
+++ b/bitcoin/src/util.h 44bd62e864ed9400105aeea2e2ef6499f971577fd28b9c8dc52ef72dcdb4d4928168037cd7d7fca718e5d5a2d4d7c19c65f5b45c87d814d6e24c0d014b307477
@@ -111,6 +111,7 @@
 extern bool fPrintToConsole;
 extern bool fPrintToDebugger;
 extern bool fCanEat;
+extern bool fVerifyAll;
 extern char pszSetDataDir[MAX_PATH];
 extern bool fRequestShutdown;
 extern bool fShutdown;