diff --git a/internal/clients/blockscout/api.go b/internal/clients/blockscout/api.go
index 7865090b9..d3627db4f 100644
--- a/internal/clients/blockscout/api.go
+++ b/internal/clients/blockscout/api.go
@@ -1,3 +1,17 @@
+// Copyright 2020 Finobo
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package blockscout
 
 import (
diff --git a/internal/clients/blockscout/receiver.go b/internal/clients/blockscout/receiver.go
index 4f135ed88..6c14b11bc 100644
--- a/internal/clients/blockscout/receiver.go
+++ b/internal/clients/blockscout/receiver.go
@@ -1,3 +1,17 @@
+// Copyright 2020 Finobo
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package blockscout
 
 import (
diff --git a/internal/clients/blockscout/types.go b/internal/clients/blockscout/types.go
index 18f767f78..25a5c7b23 100644
--- a/internal/clients/blockscout/types.go
+++ b/internal/clients/blockscout/types.go
@@ -1,3 +1,17 @@
+// Copyright 2020 Finobo
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package blockscout
 
 type txList struct {
diff --git a/internal/protocols/substrate/signer.go b/internal/protocols/substrate/signer.go
index 897ac0ce2..cb6735eaa 100644
--- a/internal/protocols/substrate/signer.go
+++ b/internal/protocols/substrate/signer.go
@@ -1,3 +1,17 @@
+// Copyright 2020 Finobo
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package substrate
 
 import (
diff --git a/internal/protocols/substrate/signer_test.go b/internal/protocols/substrate/signer_test.go
index 3b151fb4a..a5af1c820 100644
--- a/internal/protocols/substrate/signer_test.go
+++ b/internal/protocols/substrate/signer_test.go
@@ -1,3 +1,17 @@
+// Copyright 2020 Finobo
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package substrate
 
 import (