diff --git a/dap_chain.c b/dap_chain.c
index a88f04bc7358370b367559ff7941ad8dcf53e62c..debe29e8c9b0289e58d500da94b05cfa5b77e820 100644
--- a/dap_chain.c
+++ b/dap_chain.c
@@ -1,8 +1,8 @@
 /*
  * Authors:
- * Dmitriy A. Gearasimov <kahovski@gmail.com>
+ * Dmitriy A. Gearasimov <gerasimov.dmitriy@demlabs.net>
  * DeM Labs Inc.   https://demlabs.net
- * DeM Labs Open source community https://github.com/demlabsinc
+ * Kelvin Project https://github.com/kelvinblockchain
  * Copyright  (c) 2017-2018
  * All rights reserved.
 
diff --git a/dap_chain.h b/dap_chain.h
index 22d3bcd44807c1f3db6d6a05dc2535bd5cba1b00..a723b5c041a3da29ca0b3cab261c5ab71f329322 100644
--- a/dap_chain.h
+++ b/dap_chain.h
@@ -1,8 +1,8 @@
 /*
  * Authors:
- * Dmitriy A. Gearasimov <kahovski@gmail.com>
+ * Dmitriy A. Gearasimov <gerasimov.dmitriy@demlabs.net>
  * DeM Labs Inc.   https://demlabs.net
- * DeM Labs Open source community https://github.com/demlabsinc
+ * Kelvin Project https://github.com/kelvinblockchain
  * Copyright  (c) 2017-2018
  * All rights reserved.
 
@@ -22,6 +22,7 @@
     along with any DAP based project.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+
 #pragma once
 #include "dap_chain_block.h"
 #include "dap_chain_block_cache.h"
diff --git a/dap_chain_common.c b/dap_chain_common.c
index 28f6c9fb0b751aabe544501a2f1b0e0d84f6213d..d67132b16fa8ed1a3094dbc6070ef2f28f340906 100644
--- a/dap_chain_common.c
+++ b/dap_chain_common.c
@@ -1,3 +1,27 @@
+/*
+ * Authors:
+ * Dmitriy A. Gearasimov <gerasimov.dmitriy@demlabs.net>
+ * DeM Labs Inc.   https://demlabs.net
+ * Kelvin Project https://github.com/kelvinblockchain
+ * Copyright  (c) 2017-2018
+ * All rights reserved.
+
+ This file is part of DAP (Deus Applications Prototypes) the open source project
+
+    DAP (Deus Applicaions Prototypes) is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    DAP is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with any DAP based project.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
 #include <string.h>
 #include "dap_common.h"
 #include "dap_chain_common.h"
diff --git a/dap_chain_common.h b/dap_chain_common.h
index 078a0edd9ad3d299377f1dab1182cbf01d46345b..393f927cacd596edd60bad1e7336bd091474ea0d 100644
--- a/dap_chain_common.h
+++ b/dap_chain_common.h
@@ -1,8 +1,8 @@
 /*
  * Authors:
- * Dmitriy A. Gearasimov <kahovski@gmail.com>
+ * Dmitriy A. Gearasimov <gerasimov.dmitriy@demlabs.net>
  * DeM Labs Inc.   https://demlabs.net
- * DeM Labs Open source community https://github.com/demlabsinc
+ * Kelvin Project https://github.com/kelvinblockchain
  * Copyright  (c) 2017-2018
  * All rights reserved.
 
diff --git a/dap_chain_datum.c b/dap_chain_datum.c
index eee06a64c67e9a69809a03affe75fe95bbd8751c..98b80d63422e8dc1b5342c44d80e270392357d86 100644
--- a/dap_chain_datum.c
+++ b/dap_chain_datum.c
@@ -1,8 +1,8 @@
 /*
  * Authors:
- * Dmitriy A. Gearasimov <kahovski@gmail.com>
+ * Dmitriy A. Gearasimov <gerasimov.dmitriy@demlabs.net>
  * DeM Labs Inc.   https://demlabs.net
- * DeM Labs Open source community https://github.com/demlabsinc
+ * Kelvin Project https://github.com/kelvinblockchain
  * Copyright  (c) 2017-2018
  * All rights reserved.
 
diff --git a/dap_chain_datum.h b/dap_chain_datum.h
index e32c882a596798a482e98a7a02c74b342048de37..5abc823488850d83e8e9919a36075294bd540d7f 100644
--- a/dap_chain_datum.h
+++ b/dap_chain_datum.h
@@ -1,8 +1,8 @@
 /*
  * Authors:
- * Dmitriy A. Gearasimov <kahovski@gmail.com>
+ * Dmitriy A. Gearasimov <gerasimov.dmitriy@demlabs.net>
  * DeM Labs Inc.   https://demlabs.net
- * DeM Labs Open source community https://github.com/demlabsinc
+ * Kelvin Project https://github.com/kelvinblockchain
  * Copyright  (c) 2017-2018
  * All rights reserved.
 
@@ -21,6 +21,7 @@
     You should have received a copy of the GNU General Public License
     along with any DAP based project.  If not, see <http://www.gnu.org/licenses/>.
 */
+
 #pragma once
 #include <stdint.h>
 #include "dap_common.h"