diff --git a/.circleci/config.yml b/.circleci/config.yml
new file mode 100644
index 0000000..3e8c454
--- /dev/null
+++ b/.circleci/config.yml
@@ -0,0 +1,32 @@
+version: 2.1
+
+jobs:
+  release:
+    parameters:
+      resource_class:
+        type: string
+    machine:
+      image: ubuntu-2204:2023.04.2
+    resource_class: <<parameters.resource_class>>
+    steps:
+      - checkout:
+          path: silkworm-go
+      - run:
+          command: ./silkworm-go/ci/release.sh "$CIRCLE_WORKING_DIRECTORY" 16 <<pipeline.git.tag>>
+
+workflows:
+  version: 2
+  release_linux_builder:
+    jobs:
+      - release:
+          name: release-x64
+          resource_class: 2xlarge
+          filters:
+            tags: { only: /^release\/.+-base$/ }
+            branches: { ignore: /.*/ }
+      - release:
+          name: release-arm64
+          resource_class: arm.2xlarge
+          filters:
+            tags: { only: /^release\/.+-base$/ }
+            branches: { ignore: /.*/ }
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..5b7ba80
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,19 @@
+name: Release
+
+on:
+  workflow_dispatch:
+  # push:
+  #     tags:
+  #       - release/*-base
+
+jobs:
+  release:
+    runs-on: macos-13
+    # runs-on: macos-13-xlarge # M1 CPU runner requires billing setup
+    steps:
+      - uses: actions/checkout@v3
+      - run: ./ci/release_branch.sh
+      - name: release-macos
+        run: |
+          sudo xcode-select -s /Applications/Xcode_15.0.app
+          ./ci/release.sh "${{runner.workspace}}" 2 $(git branch --show-current)-base
diff --git a/ci/release.sh b/ci/release.sh
new file mode 100755
index 0000000..b7d00cc
--- /dev/null
+++ b/ci/release.sh
@@ -0,0 +1,135 @@
+#!/bin/bash
+
+set -e
+set -u
+set -o pipefail
+
+SRC_GIT_URL="https://github.com/battlmonstr/silkworm.git"
+TARGET="silkworm_capi"
+
+function release_tag {
+	base_tag="$1"
+	base_tag=${base_tag#release/} # cut prefix
+	base_tag=${base_tag%-base}    # cut suffix
+	echo "$base_tag"
+}
+
+function os_name {
+	value=$(uname -s)
+	case $value in
+		Linux)
+			echo linux;;
+		Darwin)
+			echo macos;;
+		*)
+			echo "unsupported OS: $value"
+			exit 1;;
+	esac
+}
+
+function arch_name {
+	value=$(uname -m)
+	case $value in
+		arm64)
+			echo arm64;;
+		aarch64)
+			echo arm64;;
+		x86_64)
+			echo x64;;
+		*)
+			echo "unsupported CPU architecture: $value"
+			exit 1;;
+	esac
+}
+
+work_dir="$1"
+make_jobs="$2"
+base_tag="$3"
+
+checkout_dir="$work_dir/silkworm-go"
+project_dir="$work_dir/silkworm"
+build_dir="$work_dir/build"
+product_dir="$build_dir/silkworm/capi"
+tag=$(release_tag "$base_tag")
+
+function checkout {
+	tag="capi-$tag"
+	echo "checkout tag $tag to $project_dir ..."
+	git clone --branch "$tag" --depth 1 \
+		--recurse-submodules \
+		--config submodule.ethereum-tests.update=none \
+		--config submodule.LegacyTests.update=none \
+		"$SRC_GIT_URL" "$project_dir"
+	echo "checkout done"
+	echo
+}
+
+function build_setup {
+	echo "build_setup..."
+	pip3 install --user --disable-pip-version-check conan==1.62.0 chardet
+	conan_path="$(python3 -m site --user-base)/bin"
+	export "PATH=$conan_path:$PATH"
+	conan --version
+	echo "build_setup done"
+	echo
+}
+
+function build {
+	echo "build target $TARGET in $build_dir ..."
+	cmake -B "$build_dir" -S "$project_dir"
+	cmake --build "$build_dir" --target "$TARGET" --parallel "$make_jobs"
+	ls -l "$product_dir/"*$TARGET*
+	echo "build done"
+	echo
+}
+
+function build_fake {
+	echo "build_fake target $TARGET in $build_dir ..."
+	case $(os_name) in
+		linux)
+			product_file_ext=so ;;
+		macos)
+			product_file_ext=dylib ;;
+	esac
+	mkdir -p "$product_dir"
+	echo hello > "$product_dir/lib${TARGET}.$product_file_ext"
+	ls -l "$product_dir/"*$TARGET*
+	echo "build_fake done"
+	echo
+}
+
+function upload {
+	product_path=$(echo "$product_dir/"*$TARGET*)
+	product_file_name=$(basename "$product_path")
+	release_branch="release/$tag"
+	echo "upload $product_file_name to $release_branch branch ..."
+
+	product_file_name_base=${product_file_name%.*}
+	product_file_ext=${product_file_name##*.}
+	upload_file_name="${product_file_name_base}_$(os_name)_$(arch_name).$product_file_ext"
+	cp "$product_path" "$checkout_dir/lib/$upload_file_name"
+
+	cd "$checkout_dir"
+	git fetch origin "$release_branch"
+	git checkout --track "origin/$release_branch"
+	git pull
+	git add "lib/$upload_file_name"
+	git commit -m "$upload_file_name"
+	git push
+
+	echo "upload done"
+	echo
+}
+
+function finalize {
+	echo "finalize..."
+	echo "finalize done"
+	echo
+}
+
+checkout
+build_setup
+#build
+build_fake
+upload
+finalize
diff --git a/ci/release_branch.sh b/ci/release_branch.sh
new file mode 100755
index 0000000..ff69135
--- /dev/null
+++ b/ci/release_branch.sh
@@ -0,0 +1,35 @@
+#!/bin/bash
+
+SRC_GIT_URL="https://github.com/battlmonstr/silkworm.git"
+
+function release_tag {
+	git ls-remote --tags "$SRC_GIT_URL" | grep 'capi-' | cut -d '-' -f 2 | while read tag
+	do
+		if ! git ls-remote --heads | grep "release/$tag" > /dev/null
+		then
+			echo $tag
+			break
+		fi
+	done
+}
+
+tag=$(release_tag)
+
+if [[ -z "$tag" ]]
+then
+	echo "release tag not found"
+	exit 1
+fi
+
+branch="release/$tag"
+base_tag="${branch}-base"
+
+echo "release tag: $tag"
+echo "release branch: $branch"
+echo "release base tag: $base_tag"
+
+git checkout -b "$branch"
+git push --set-upstream origin "$branch"
+
+git tag "$base_tag"
+git push --tags
diff --git a/include/readme.txt b/include/readme.txt
new file mode 100644
index 0000000..337a2b4
--- /dev/null
+++ b/include/readme.txt
@@ -0,0 +1 @@
+header files
diff --git a/lib/readme.txt b/lib/readme.txt
new file mode 100644
index 0000000..1aa3ee1
--- /dev/null
+++ b/lib/readme.txt
@@ -0,0 +1 @@
+libraries