diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 209629b8..432fed99 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,4 +1,4 @@
-name: nim-dagger CI
+name: CI
 on:
   push:
     branches:
@@ -12,7 +12,7 @@ jobs:
       fail-fast: false
       max-parallel: 20
       matrix:
-        branch: [v1.2.18, v1.6.4]
+        branch: [v1.2.18, v1.6.6]
         target:
           # Unit tests
           - os: linux
@@ -37,10 +37,10 @@ jobs:
     name: '${{ matrix.target.os }}-${{ matrix.target.cpu }}-${{ matrix.branch }}'
     runs-on: ${{ matrix.builder }}
     steps:
-      - name: Checkout nim-dagger
+      - name: Checkout nim-codex
         uses: actions/checkout@v2
         with:
-          path: nim-dagger
+          path: nim-codex
           submodules: true
 
       - name: Derive environment variables
@@ -175,7 +175,7 @@ jobs:
         id: nim-cache
         uses: actions/cache@v2
         with:
-          path: nim-dagger/NimBinaries
+          path: nim-codex/NimBinaries
           key: 'nim-${{ matrix.branch }}-${{ matrix.target.os }}-${{ matrix.target.cpu }}-${{ steps.versions.outputs.nimbus_build_system }}'
 
       - name: Install NodeJS
@@ -183,25 +183,25 @@ jobs:
         with:
           node-version: '14'
 
-      - name: Build Nim and Dagger dependencies
+      - name: Build Nim and Codex dependencies
         shell: bash
-        working-directory: nim-dagger
+        working-directory: nim-codex
         run: |
           if [[ "${{ runner.os }}" == "macOS" ]]; then
             ulimit -n 1024
           fi
           make -j$ncpu ARCH_OVERRIDE=$PLATFORM CI_CACHE=NimBinaries NIM_COMMIT="${{ matrix.branch }}" QUICK_AND_DIRTY_COMPILER=1 update
 
-      - name: Start Ethereum Node with Dagger contracts
+      - name: Start Ethereum Node with Codex contracts
         shell: bash
-        working-directory: nim-dagger/vendor/dagger-contracts
+        working-directory: nim-codex/vendor/dagger-contracts
         run: |
           npm install
           npm start &
 
-      - name: Run nim-dagger tests
+      - name: Run nim-codex tests
         shell: bash
-        working-directory: nim-dagger
+        working-directory: nim-codex
         run: |
           ./env.sh nim --version
           echo
diff --git a/.github/workflows/codecov.yml b/.github/workflows/codecov.yml
new file mode 100644
index 00000000..c530c659
--- /dev/null
+++ b/.github/workflows/codecov.yml
@@ -0,0 +1,224 @@
+name: Coverage
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      max-parallel: 20
+      matrix:
+        branch: [v1.6.6]
+        target:
+          # Unit tests
+          - os: linux
+            cpu: amd64
+            TEST_KIND: unit-tests
+          # - os: macos
+          #   cpu: amd64
+          #   TEST_KIND: unit-tests
+          # - os: windows
+          #   cpu: amd64
+          #   TEST_KIND: unit-tests
+        include:
+          - target:
+              os: linux
+            builder: ubuntu-18.04
+          # - target:
+          #     os: macos
+          #   builder: macos-10.15
+          # - target:
+          #     os: windows
+          #   builder: windows-2019
+    name: '${{ matrix.target.os }}-${{ matrix.target.cpu }}-${{ matrix.branch }}'
+    runs-on: ${{ matrix.builder }}
+    steps:
+      - name: Checkout nim-codex
+        uses: actions/checkout@v2
+        with:
+          path: nim-codex
+          submodules: true
+
+      - name: Derive environment variables
+        shell: bash
+        run: |
+          if [[ '${{ matrix.target.cpu }}' == 'amd64' ]]; then
+            ARCH=64
+            PLATFORM=x64
+          else
+            ARCH=32
+            PLATFORM=x86
+          fi
+          echo "ARCH=$ARCH" >> $GITHUB_ENV
+          echo "PLATFORM=$PLATFORM" >> $GITHUB_ENV
+          ncpu=
+          ext=
+          case '${{ runner.os }}' in
+          'Linux')
+            ncpu=$(nproc)
+            ;;
+          'macOS')
+            ncpu=$(sysctl -n hw.ncpu)
+            ;;
+          'Windows')
+            ncpu=$NUMBER_OF_PROCESSORS
+            ext=.exe
+            ;;
+          esac
+          [[ -z "$ncpu" || $ncpu -le 0 ]] && ncpu=1
+          echo "ncpu=$ncpu" >> $GITHUB_ENV
+          echo "ext=$ext" >> $GITHUB_ENV
+
+      - name: Install coverage dependencies (Linux)
+        if: runner.os == 'Linux'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y lcov
+
+      - name: Install build dependencies (Linux i386)
+        if: runner.os == 'Linux' && matrix.target.cpu == 'i386'
+        run: |
+          sudo dpkg --add-architecture i386
+          sudo apt-get update -qq
+          sudo DEBIAN_FRONTEND='noninteractive' apt-get install \
+            --no-install-recommends -yq gcc-multilib g++-multilib \
+            libssl-dev:i386
+          mkdir -p external/bin
+          cat << EOF > external/bin/gcc
+          #!/bin/bash
+          exec $(which gcc) -m32 "\$@"
+          EOF
+          cat << EOF > external/bin/g++
+          #!/bin/bash
+          exec $(which g++) -m32 "\$@"
+          EOF
+          chmod 755 external/bin/gcc external/bin/g++
+          echo '${{ github.workspace }}/external/bin' >> $GITHUB_PATH
+          NIMFLAGS="-d:LeopardCmakeFlags='-DCMAKE_BUILD_TYPE=Release -DCMAKE_C_FLAGS=-m32 -DCMAKE_CXX_FLAGS=-m32'"
+          quote () {
+            local quoted=${1//\'/\'\\\'\'};
+            printf "'%s'" "$quoted"
+          }
+          echo "NIMFLAGS=$(quote "${NIMFLAGS}")" >> $GITHUB_ENV
+
+      - name: Install build dependencies (macOS)
+        if: runner.os == 'macOS'
+        run: |
+          brew install libomp
+          echo "$(brew --prefix)/opt/llvm/bin" >> $GITHUB_PATH
+          echo "LDFLAGS=-L$(brew --prefix)/opt/libomp/lib -L$(brew --prefix)/opt/llvm/lib -Wl,-rpath,$(brew --prefix)/opt/llvm/lib" >> $GITHUB_ENV
+          NIMFLAGS="-d:LeopardCmakeFlags='-DCMAKE_BUILD_TYPE=Release -DCMAKE_C_COMPILER=$(brew --prefix)/opt/llvm/bin/clang -DCMAKE_CXX_COMPILER=$(brew --prefix)/opt/llvm/bin/clang++' -d:LeopardExtraCompilerlags='-fopenmp' -d:LeopardExtraLinkerFlags='-fopenmp -L$(brew --prefix)/opt/libomp/lib'"
+          quote () {
+            local quoted=${1//\'/\'\\\'\'};
+            printf "'%s'" "$quoted"
+          }
+          echo "NIMFLAGS=$(quote "${NIMFLAGS}")" >> $GITHUB_ENV
+
+      - name: Restore MinGW-W64 (Windows) from cache
+        if: runner.os == 'Windows'
+        id: windows-mingw-cache
+        uses: actions/cache@v2
+        with:
+          path: external/mingw-${{ matrix.target.cpu }}
+          key: 'mingw-${{ matrix.target.cpu }}'
+
+      - name: Restore Nim DLLs dependencies (Windows) from cache
+        if: runner.os == 'Windows'
+        id: windows-dlls-cache
+        uses: actions/cache@v2
+        with:
+          path: external/dlls-${{ matrix.target.cpu }}
+          key: 'dlls-${{ matrix.target.cpu }}'
+
+      - name: Install MinGW64 dependency (Windows)
+        if: >
+          steps.windows-mingw-cache.outputs.cache-hit != 'true' &&
+          runner.os == 'Windows'
+        shell: bash
+        run: |
+          mkdir -p external
+          curl -L "https://nim-lang.org/download/mingw$ARCH.7z" -o "external/mingw-${{ matrix.target.cpu }}.7z"
+          7z x -y "external/mingw-${{ matrix.target.cpu }}.7z" -oexternal/
+          mv external/mingw$ARCH external/mingw-${{ matrix.target.cpu }}
+
+      - name: Install DLLs dependencies (Windows)
+        if: >
+          steps.windows-dlls-cache.outputs.cache-hit != 'true' &&
+          runner.os == 'Windows'
+        shell: bash
+        run: |
+          mkdir -p external
+          curl -L "https://nim-lang.org/download/windeps.zip" -o external/windeps.zip
+          7z x -y external/windeps.zip -oexternal/dlls-${{ matrix.target.cpu }}
+
+      - name: Path to cached dependencies (Windows)
+        if: >
+          runner.os == 'Windows'
+        shell: bash
+        run: |
+          echo "${{ github.workspace }}/external/mingw-${{ matrix.target.cpu }}/bin" >> $GITHUB_PATH
+          echo "${{ github.workspace }}/external/dlls-${{ matrix.target.cpu }}" >> $GITHUB_PATH
+
+      - name: Setup environment
+        shell: bash
+        run: echo '${{ github.workspace }}/nim/bin' >> $GITHUB_PATH
+
+      - name: Get latest nimbus-build-system commit hash
+        id: versions
+        shell: bash
+        run: |
+          getHash() {
+            git ls-remote "https://github.com/$1" "${2:-HEAD}" | cut -f 1
+          }
+          nbsHash=$(getHash status-im/nimbus-build-system)
+          echo "::set-output name=nimbus_build_system::$nbsHash"
+
+      - name: Restore prebuilt Nim binaries from cache
+        id: nim-cache
+        uses: actions/cache@v2
+        with:
+          path: nim-codex/NimBinaries
+          key: 'nim-${{ matrix.branch }}-${{ matrix.target.os }}-${{ matrix.target.cpu }}-${{ steps.versions.outputs.nimbus_build_system }}'
+
+      - name: Install NodeJS
+        uses: actions/setup-node@v2
+        with:
+          node-version: '14'
+
+      - name: Build Nim and Codex dependencies
+        shell: bash
+        working-directory: nim-codex
+        run: |
+          if [[ "${{ runner.os }}" == "macOS" ]]; then
+            ulimit -n 1024
+          fi
+          make -j$ncpu ARCH_OVERRIDE=$PLATFORM CI_CACHE=NimBinaries NIM_COMMIT="${{ matrix.branch }}" QUICK_AND_DIRTY_COMPILER=1 update
+
+      - name: Start Ethereum Node with Codex contracts
+        shell: bash
+        working-directory: nim-codex/vendor/dagger-contracts
+        run: |
+          npm install
+          npm start &
+
+      - name: Run nim-codex tests and generate coverage data
+        shell: bash
+        working-directory: nim-codex
+        run: |
+          ./env.sh nim --version
+          echo
+          make NIM_COMMIT="${{ matrix.branch }}" coverage
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v2
+        with:
+          directory: ./nim-codex/coverage/
+          fail_ci_if_error: true
+          files: ./nim-codex/coverage/coverage.f.info
+          flags: unittests
+          name: codecov-umbrella
+          verbose: true
diff --git a/.gitignore b/.gitignore
index 1db48b94..c9bad6d9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,6 +9,9 @@ nimcache/
 # Executables shall be put in an ignored build/ directory
 build/
 
+# Coverage data shall be put in an ignored coverage/ directory
+coverage/
+
 # Nimble packages
 /vendor/.nimble
 
diff --git a/Makefile b/Makefile
index 4fedae7b..b6bdb8c7 100644
--- a/Makefile
+++ b/Makefile
@@ -21,11 +21,12 @@ LINK_PCRE := 0
 
 .PHONY: \
 	all \
-	deps \
-	update \
-	test \
 	clean \
-	libbacktrace
+	coverage \
+	deps \
+	libbacktrace \
+	test \
+	update
 
 ifeq ($(NIM_PARAMS),)
 # "variables.mk" was not included, so we update the submodules.
@@ -82,7 +83,7 @@ test: | build deps
 
 # Builds and runs all tests
 testAll: | build deps
-	echo -e $(BUILD_MSG) "build/$@" && \
+	echo -e $(BUILD_MSG) "build/testDagger" "build/testContracts" && \
 		$(ENV_SCRIPT) nim testAll $(NIM_PARAMS) dagger.nims
 
 # symlink
@@ -93,6 +94,18 @@ dagger.nims:
 libbacktrace:
 	+ $(MAKE) -C vendor/nim-libbacktrace --no-print-directory BUILD_CXX_LIB=0
 
+coverage:
+	$(MAKE) NIMFLAGS="--lineDir:on --passC:-fprofile-arcs --passC:-ftest-coverage --passL:-fprofile-arcs --passL:-ftest-coverage" testAll
+	cd nimcache/release/testDagger && rm -f *.c
+	cd nimcache/release/testContracts && rm -f *.c
+	mkdir -p coverage
+	lcov --capture --directory nimcache/release/testDagger --directory nimcache/release/testContracts --output-file coverage/coverage.info
+	shopt -s globstar && ls $$(pwd)/dagger/{*,**/*}.nim
+	shopt -s globstar && lcov --extract coverage/coverage.info $$(pwd)/dagger/{*,**/*}.nim --output-file coverage/coverage.f.info
+	echo -e $(BUILD_MSG) "coverage/report/index.html"
+	genhtml coverage/coverage.f.info --output-directory coverage/report
+	if which open >/dev/null; then (echo -e "\e[92mOpening\e[39m HTML coverage report in browser..." && open coverage/report/index.html) || true; fi
+
 # usual cleaning
 clean: | clean-common
 	rm -rf build
diff --git a/README.md b/README.md
new file mode 100644
index 00000000..c4bba2d8
--- /dev/null
+++ b/README.md
@@ -0,0 +1,7 @@
+# nim-codex
+
+[![License: Apache](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
+[![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](https://opensource.org/licenses/MIT)
+[![Stability: experimental](https://img.shields.io/badge/stability-experimental-orange.svg)](#stability)
+[![CI](https://github.com/status-im/nim-codex/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/status-im/nim-codex/actions?query=workflow%3ACI+branch%3Amain)
+[![Codecov](https://codecov.io/gh/status-im/nim-codex/branch/main/graph/badge.svg?token=XFmCyPSNzW)](https://codecov.io/gh/status-im/nim-codex)
diff --git a/codecov.yml b/codecov.yml
new file mode 100644
index 00000000..429a94c8
--- /dev/null
+++ b/codecov.yml
@@ -0,0 +1,22 @@
+coverage:
+  status:
+    project:
+      default:
+        # advanced settings
+
+        # Prevents PR from being blocked with a reduction in coverage.
+        # Note, if we want to re-enable this, a `threshold` value can be used
+        # allow coverage to drop by x% while still posting a success status.
+        # `informational`: https://docs.codecov.com/docs/commit-status#informational
+        # `threshold`: https://docs.codecov.com/docs/commit-status#threshold
+        informational: true
+    patch:
+      default:
+        # advanced settings
+
+        # Prevents PR from being blocked with a reduction in coverage.
+        # Note, if we want to re-enable this, a `threshold` value can be used
+        # allow coverage to drop by x% while still posting a success status.
+        # `informational`: https://docs.codecov.com/docs/commit-status#informational
+        # `threshold`: https://docs.codecov.com/docs/commit-status#threshold
+        informational: true