diff --git a/contrib/gitian-build.sh b/contrib/gitian-build.sh
index 2b9778c87..b10f9280a 100755
--- a/contrib/gitian-build.sh
+++ b/contrib/gitian-build.sh
@@ -1,4 +1,5 @@
 # Copyright (c) 2016 The Bitcoin Core developers
+# Copyright (c) 2018-2020 The Sugarchain Yumekawa developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/amount.h b/src/amount.h
index 6a1c7a1ee..517f3bc7d 100644
--- a/src/amount.h
+++ b/src/amount.h
@@ -1,5 +1,6 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2016 The Bitcoin Core developers
+// Copyright (c) 2018-2020 The Sugarchain Yumekawa developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/chain.h b/src/chain.h
index 899d5e10f..9e4b6c46d 100644
--- a/src/chain.h
+++ b/src/chain.h
@@ -1,5 +1,6 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2017 The Bitcoin Core developers
+// Copyright (c) 2018-2020 The Sugarchain Yumekawa developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index dfe7c63dd..9e59fa33c 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -1,5 +1,6 @@
 // Copyright (c) 2010 Satoshi Nakamoto
 // Copyright (c) 2009-2017 The Bitcoin Core developers
+// Copyright (c) 2018-2020 The Sugarchain Yumekawa developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/consensus/params.h b/src/consensus/params.h
index 66ba243ff..4409ed115 100644
--- a/src/consensus/params.h
+++ b/src/consensus/params.h
@@ -1,5 +1,6 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2017 The Bitcoin Core developers
+// Copyright (c) 2018-2020 The Sugarchain Yumekawa developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/init.cpp b/src/init.cpp
index f0212f5f3..03180b787 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -1,5 +1,6 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2017 The Bitcoin Core developers
+// Copyright (c) 2018-2020 The Sugarchain Yumekawa developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index ef64dfe93..139998042 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -1,5 +1,6 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2017 The Bitcoin Core developers
+// Copyright (c) 2018-2020 The Sugarchain Yumekawa developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/net_processing.h b/src/net_processing.h
index f0459fe01..e8235a6c5 100644
--- a/src/net_processing.h
+++ b/src/net_processing.h
@@ -1,5 +1,6 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2017 The Bitcoin Core developers
+// Copyright (c) 2018-2020 The Sugarchain Yumekawa developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/netbase.cpp b/src/netbase.cpp
index 47a841350..d88b1f433 100644
--- a/src/netbase.cpp
+++ b/src/netbase.cpp
@@ -1,5 +1,6 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2017 The Bitcoin Core developers
+// Copyright (c) 2018-2020 The Sugarchain Yumekawa developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/pow.cpp b/src/pow.cpp
index e7ef82ca8..16ca8c3a9 100644
--- a/src/pow.cpp
+++ b/src/pow.cpp
@@ -1,5 +1,7 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2017 The Bitcoin Core developers
+// Copyright (c) 2016-2018 The Zcash developers - DigiShieldZEC
+// Copyright (c) 2018-2020 The Sugarchain Yumekawa developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/pow.h b/src/pow.h
index 380f1bdb2..1f64dbf84 100644
--- a/src/pow.h
+++ b/src/pow.h
@@ -1,5 +1,7 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2017 The Bitcoin Core developers
+// Copyright (c) 2016-2018 The Zcash developers - DigiShieldZEC
+// Copyright (c) 2018-2020 The Sugarchain Yumekawa developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/primitives/block.cpp b/src/primitives/block.cpp
index 69dcd91f0..29dc5f309 100644
--- a/src/primitives/block.cpp
+++ b/src/primitives/block.cpp
@@ -1,5 +1,6 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2017 The Bitcoin Core developers
+// Copyright (c) 2018-2020 The Sugarchain Yumekawa developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/primitives/block.h b/src/primitives/block.h
index fdb140f76..bb43a9bcd 100644
--- a/src/primitives/block.h
+++ b/src/primitives/block.h
@@ -1,5 +1,6 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2017 The Bitcoin Core developers
+// Copyright (c) 2018-2020 The Sugarchain Yumekawa developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/qt/splashscreen.cpp b/src/qt/splashscreen.cpp
index a6b18663d..c40ccd006 100644
--- a/src/qt/splashscreen.cpp
+++ b/src/qt/splashscreen.cpp
@@ -1,4 +1,5 @@
 // Copyright (c) 2011-2017 The Bitcoin Core developers
+// Copyright (c) 2018-2020 The Sugarchain Yumekawa developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/qt/walletmodel.cpp b/src/qt/walletmodel.cpp
index ba577137e..88bcf2205 100644
--- a/src/qt/walletmodel.cpp
+++ b/src/qt/walletmodel.cpp
@@ -1,4 +1,5 @@
 // Copyright (c) 2011-2017 The Bitcoin Core developers
+// Copyright (c) 2018-2020 The Sugarchain Yumekawa developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/timedata.h b/src/timedata.h
index ec5a03eda..b8a07e3c0 100644
--- a/src/timedata.h
+++ b/src/timedata.h
@@ -1,4 +1,5 @@
 // Copyright (c) 2014-2017 The Bitcoin Core developers
+// Copyright (c) 2018-2020 The Sugarchain Yumekawa developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/validation.cpp b/src/validation.cpp
index 7066c240a..52fa782f3 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -1,6 +1,7 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2017 The Bitcoin Core developers
 // Copyright (c) 2013-2019 Alexander Peslyak - Yespower 1.0.1
+// Copyright (c) 2018-2020 The Sugarchain Yumekawa developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.