diff --git a/cmd/tomo/main.go b/cmd/tomo/main.go
index b2036adab8..2415b6f7cb 100644
--- a/cmd/tomo/main.go
+++ b/cmd/tomo/main.go
@@ -14,7 +14,6 @@
 // You should have received a copy of the GNU General Public License
 // along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
 
-// tomo is the official command-line client for Ethereum.
 package main
 
 import (
diff --git a/contracts/blocksigner/blocksigner.go b/contracts/blocksigner/blocksigner.go
index 57846f6128..d7fe0970cb 100644
--- a/contracts/blocksigner/blocksigner.go
+++ b/contracts/blocksigner/blocksigner.go
@@ -1,3 +1,18 @@
+// Copyright (c) 2018 Tomochain
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program 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 Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
 package blocksigner
 
 import (
diff --git a/contracts/blocksigner/blocksigner_test.go b/contracts/blocksigner/blocksigner_test.go
index 139e18d0f0..0759964ed4 100644
--- a/contracts/blocksigner/blocksigner_test.go
+++ b/contracts/blocksigner/blocksigner_test.go
@@ -1,3 +1,18 @@
+// Copyright (c) 2018 Tomochain
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program 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 Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
 package blocksigner
 
 import (
diff --git a/contracts/randomize/randomize.go b/contracts/randomize/randomize.go
index 07651f07e5..15cdc05bbe 100644
--- a/contracts/randomize/randomize.go
+++ b/contracts/randomize/randomize.go
@@ -1,3 +1,18 @@
+// Copyright (c) 2018 Tomochain
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program 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 Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
 package randomize
 
 import (
diff --git a/contracts/randomize/randomize_test.go b/contracts/randomize/randomize_test.go
index 76ca30fb96..17c0993ea8 100644
--- a/contracts/randomize/randomize_test.go
+++ b/contracts/randomize/randomize_test.go
@@ -1,3 +1,18 @@
+// Copyright (c) 2018 Tomochain
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program 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 Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
 package randomize
 
 import (
diff --git a/contracts/utils.go b/contracts/utils.go
index a135e84e68..cd357519a4 100644
--- a/contracts/utils.go
+++ b/contracts/utils.go
@@ -1,3 +1,18 @@
+// Copyright (c) 2018 Tomochain
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program 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 Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
 package contracts
 
 import (
diff --git a/contracts/utils_test.go b/contracts/utils_test.go
index 6634923000..9bfc9aa94b 100644
--- a/contracts/utils_test.go
+++ b/contracts/utils_test.go
@@ -1,3 +1,18 @@
+// Copyright (c) 2018 Tomochain
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program 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 Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
 package contracts
 
 import (
diff --git a/contracts/validator/validator.go b/contracts/validator/validator.go
index f9e7891e07..0279bfc5ad 100644
--- a/contracts/validator/validator.go
+++ b/contracts/validator/validator.go
@@ -1,3 +1,18 @@
+// Copyright (c) 2018 Tomochain
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program 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 Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
 package validator
 
 import (
diff --git a/contracts/validator/validator_test.go b/contracts/validator/validator_test.go
index 000fc165c6..9eb1bb21eb 100644
--- a/contracts/validator/validator_test.go
+++ b/contracts/validator/validator_test.go
@@ -1,3 +1,18 @@
+// Copyright (c) 2018 Tomochain
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program 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 Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
 package validator
 
 import (