diff --git a/src/cc/heir.cpp b/src/cc/heir.cpp
index ce0445975..93a59f95f 100644
--- a/src/cc/heir.cpp
+++ b/src/cc/heir.cpp
@@ -1247,7 +1247,7 @@ void _HeirList(struct CCcontract_info *cp, UniValue &result)
 	GetCCaddress(cp, markeraddr, GetUnspendable(cp, NULL));
     SetCCunspents(unspentOutputs, markeraddr);
     
-    std::cerr << "HeirList() finding heir marker from unspendable addr=" << markeraddr << " unspentOutputs.size()=" << unspentOutputs.size() << '\n';
+    //std::cerr << "HeirList() finding heir marker from unspendable addr=" << markeraddr << " unspentOutputs.size()=" << unspentOutputs.size() << '\n';
     
     // TODO: move marker to special cc addr to prevent checking all tokens
     for (std::vector<std::pair<CAddressUnspentKey, CAddressUnspentValue>>::const_iterator it = unspentOutputs.begin(); it != unspentOutputs.end(); it++) {
@@ -1256,7 +1256,7 @@ void _HeirList(struct CCcontract_info *cp, UniValue &result)
         uint256 tokenid;
         int32_t vout = (int32_t)it->first.index;
         
-        std::cerr << "HeirList() checking txid=" << txid.GetHex() << " vout=" << vout << '\n';
+        //std::cerr << "HeirList() checking txid=" << txid.GetHex() << " vout=" << vout << '\n';
         
         CTransaction fundingtx;
         if (GetTransaction(txid, fundingtx, hashBlock, false)) {
diff --git a/src/cc/heir_validate.h b/src/cc/heir_validate.h
index 6e4049896..df58e3bf1 100644
--- a/src/cc/heir_validate.h
+++ b/src/cc/heir_validate.h
@@ -631,21 +631,20 @@ public:
 		uint256 fundingTxidInOpret = zeroid, dummyTxid, tokenid = zeroid, initialTokenid = zeroid;
 		uint8_t dummyIsHeirSpendingBegan;
 
-		std::cerr << "CMarkerValidator::validateVin() prevVout.size()=" << prevVout.size() << " prevN=" << prevN << std::endl;
-
+		//std::cerr << "CMarkerValidator::validateVin() prevVout.size()=" << prevVout.size() << " prevN=" << prevN << std::endl;
 		if (prevVout.size() > 0) {
 
 			// get funcId for prev tx:
 			uint8_t funcId = DecodeHeirEitherOpRet(prevVout[prevVout.size()-1].scriptPubKey, tokenid, fundingTxidInOpret, dummyIsHeirSpendingBegan, true);
 
-			std::cerr << "CMarkerValidator::validateVin() funcId=" << (funcId?funcId:' ') << std::endl;
+			//std::cerr << "CMarkerValidator::validateVin() funcId=" << (funcId?funcId:' ') << std::endl;
 
 			if (funcId == 'F' && prevN == 1) { // do not allow to spend 'F' marker's vout
 				message = std::string("spending marker not allowed");
 				return false;
 			}
 		}
-		std::cerr << "CMarkerValidator::validateVin() exits with true" << std::endl;
+		//std::cerr << "CMarkerValidator::validateVin() exits with true" << std::endl;
 		return true; 
 	}
 };