diff --git a/tools/evmstate/config.nim b/tools/evmstate/config.nim
index 95fc6a099..e6a9badb8 100644
--- a/tools/evmstate/config.nim
+++ b/tools/evmstate/config.nim
@@ -1,3 +1,13 @@
+# Nimbus
+# Copyright (c) 2022 Status Research & Development GmbH
+# Licensed under either of
+#  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+#    http://www.apache.org/licenses/LICENSE-2.0)
+#  * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+#    http://opensource.org/licenses/MIT)
+# at your option. This file may not be copied, modified, or distributed except
+# according to those terms.
+
 import
   std/[os, options],
   confutils, confutils/defs
diff --git a/tools/evmstate/evmstate.nim b/tools/evmstate/evmstate.nim
index 337037747..48ab94e54 100644
--- a/tools/evmstate/evmstate.nim
+++ b/tools/evmstate/evmstate.nim
@@ -1,3 +1,13 @@
+# Nimbus
+# Copyright (c) 2022 Status Research & Development GmbH
+# Licensed under either of
+#  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+#    http://www.apache.org/licenses/LICENSE-2.0)
+#  * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+#    http://opensource.org/licenses/MIT)
+# at your option. This file may not be copied, modified, or distributed except
+# according to those terms.
+
 import
   std/[json, strutils, sets, tables, options],
   chronicles,
diff --git a/tools/evmstate/evmstate_test.nim b/tools/evmstate/evmstate_test.nim
index 3e2742af0..48d570777 100644
--- a/tools/evmstate/evmstate_test.nim
+++ b/tools/evmstate/evmstate_test.nim
@@ -1,3 +1,13 @@
+# Nimbus
+# Copyright (c) 2022 Status Research & Development GmbH
+# Licensed under either of
+#  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+#    http://www.apache.org/licenses/LICENSE-2.0)
+#  * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+#    http://opensource.org/licenses/MIT)
+# at your option. This file may not be copied, modified, or distributed except
+# according to those terms.
+
 import
   std/[os, osproc, strutils, tables],
   unittest2,
diff --git a/tools/evmstate/helpers.nim b/tools/evmstate/helpers.nim
index 626ead01d..ecb7d9589 100644
--- a/tools/evmstate/helpers.nim
+++ b/tools/evmstate/helpers.nim
@@ -1,3 +1,13 @@
+# Nimbus
+# Copyright (c) 2022 Status Research & Development GmbH
+# Licensed under either of
+#  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+#    http://www.apache.org/licenses/LICENSE-2.0)
+#  * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+#    http://opensource.org/licenses/MIT)
+# at your option. This file may not be copied, modified, or distributed except
+# according to those terms.
+
 import
   std/[options, json, strutils],
   eth/[common, keys],
diff --git a/tools/t8n/config.nim b/tools/t8n/config.nim
index 605c3eaa2..e0991a860 100644
--- a/tools/t8n/config.nim
+++ b/tools/t8n/config.nim
@@ -1,3 +1,13 @@
+# Nimbus
+# Copyright (c) 2022 Status Research & Development GmbH
+# Licensed under either of
+#  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+#    http://www.apache.org/licenses/LICENSE-2.0)
+#  * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+#    http://opensource.org/licenses/MIT)
+# at your option. This file may not be copied, modified, or distributed except
+# according to those terms.
+
 import
   std/[options, os, strutils],
   confutils, stint,
diff --git a/tools/t8n/t8n.nim b/tools/t8n/t8n.nim
index 80a582cb4..3411f86b5 100644
--- a/tools/t8n/t8n.nim
+++ b/tools/t8n/t8n.nim
@@ -1,3 +1,13 @@
+# Nimbus
+# Copyright (c) 2022 Status Research & Development GmbH
+# Licensed under either of
+#  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+#    http://www.apache.org/licenses/LICENSE-2.0)
+#  * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+#    http://opensource.org/licenses/MIT)
+# at your option. This file may not be copied, modified, or distributed except
+# according to those terms.
+
 import
   chronicles,
   "."/[config, transition]
diff --git a/tools/t8n/t8n_test.nim b/tools/t8n/t8n_test.nim
index a6b1e063b..cae9beda0 100644
--- a/tools/t8n/t8n_test.nim
+++ b/tools/t8n/t8n_test.nim
@@ -1,3 +1,13 @@
+# Nimbus
+# Copyright (c) 2022 Status Research & Development GmbH
+# Licensed under either of
+#  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+#    http://www.apache.org/licenses/LICENSE-2.0)
+#  * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+#    http://opensource.org/licenses/MIT)
+# at your option. This file may not be copied, modified, or distributed except
+# according to those terms.
+
 import
   std/[os, osproc, strutils, json, tables],
   unittest2,
diff --git a/tools/t8n/transition.nim b/tools/t8n/transition.nim
index 42417c556..8b6678bce 100644
--- a/tools/t8n/transition.nim
+++ b/tools/t8n/transition.nim
@@ -1,3 +1,13 @@
+# Nimbus
+# Copyright (c) 2022 Status Research & Development GmbH
+# Licensed under either of
+#  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+#    http://www.apache.org/licenses/LICENSE-2.0)
+#  * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+#    http://opensource.org/licenses/MIT)
+# at your option. This file may not be copied, modified, or distributed except
+# according to those terms.
+
 import
   std/[json, strutils, times, tables, os, sets],
   eth/[rlp, trie, eip1559],
diff --git a/tools/t8n/txpriv.nim b/tools/t8n/txpriv.nim
index 854cb9a86..88a3e5997 100644
--- a/tools/t8n/txpriv.nim
+++ b/tools/t8n/txpriv.nim
@@ -1,3 +1,13 @@
+# Nimbus
+# Copyright (c) 2022 Status Research & Development GmbH
+# Licensed under either of
+#  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+#    http://www.apache.org/licenses/LICENSE-2.0)
+#  * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+#    http://opensource.org/licenses/MIT)
+# at your option. This file may not be copied, modified, or distributed except
+# according to those terms.
+
 import
   eth/common