diff --git a/src/script/interpreter.cpp b/src/script/interpreter.cpp
index e33930624..e12e3a457 100644
--- a/src/script/interpreter.cpp
+++ b/src/script/interpreter.cpp
@@ -1323,6 +1323,7 @@ int TransactionSignatureChecker::CheckCryptoCondition(
     fprintf(stderr," sighash nIn.%d nHashType.%d %.8f id.%d\n",(int32_t)nIn,(int32_t)nHashType,(double)amount/COIN,(int32_t)consensusBranchId);
 
     VerifyEval eval = [] (CC *cond, void *checker) {
+        fprintf(stderr,"checker.%p\n",(TransactionSignatureChecker*)checker);
         return ((TransactionSignatureChecker*)checker)->CheckEvalCondition(cond);
     };
 
diff --git a/src/script/serverchecker.cpp b/src/script/serverchecker.cpp
index 4de69001a..4451ab485 100644
--- a/src/script/serverchecker.cpp
+++ b/src/script/serverchecker.cpp
@@ -102,5 +102,6 @@ bool ServerTransactionSignatureChecker::VerifySignature(const std::vector<unsign
  */
 int ServerTransactionSignatureChecker::CheckEvalCondition(const CC *cond) const
 {
+    fprintf(stderr,"call RunCCeval from ServerTransactionSignatureChecker::CheckEvalCondition\n");
     return RunCCEval(cond, *txTo, nIn);
 }