diff --git a/.github/workflows/create-release.yaml b/.github/workflows/create-release.yaml
index 40f0f5e..97998a5 100644
--- a/.github/workflows/create-release.yaml
+++ b/.github/workflows/create-release.yaml
@@ -2,7 +2,6 @@ name: Create release
 
 on:
   push:
-    branches: [ main ]
     tags:
       - "v*.*.*"
   pull_request:
@@ -18,86 +17,102 @@ jobs:
         python-version: [ 3.11 ]
         node-version: [ 18.16.0 ]
 
-        solc-version: [ 0.8.19 ]
         ganache-version: [ 7.8.0 ]
 
-        opt-flags: [ "--optimize --optimize-runs 200" ]
+        solc-version: [ v0.8.20 ]
+
+    env:
+      SOLC_BIN: ${{ github.workspace }}/build/solc-static-linux
+      SOLC_FLAGS: >-
+        --optimize --optimize-runs 200
+        --revert-strings strip
+        --via-ir
+        --overwrite
+        --base-path ${{ github.workspace }}
+        --output-dir ${{ github.workspace }}/build/
+      SOLC_VER_CMD: >-
+        ${{ github.workspace }}/build/solc-static-linux
+        --version | tail -n 1 | sed -e "s/^Version: //g"
+      RELE_NOTE: ${{ github.workspace }}/build/release_note.md
 
     name: A job to create a release
     steps:
     - name: Checkout
       uses: actions/checkout@v3
-
-    - name: Installing Node ${{ matrix.node-version }}
-      uses: actions/setup-node@v3
       with:
-        node-version: ${{ matrix.node-version }}
+        submodules: recursive
 
     - name: Installing Python ${{ matrix.python-version }}
       uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
 
+    - name: Installing Python packages
+      run: |
+        python3 -m pip install --requirement ${{ github.workspace }}/utils/gas_cost_eval_requirements.txt
+
+    - name: Installing Node ${{ matrix.node-version }}
+      uses: actions/setup-node@v3
+      with:
+        node-version: ${{ matrix.node-version }}
+
     - name: Installing NPM packages
       run: |
-        npm install -g solc@${{ matrix.solc-version }}
         npm install -g ganache@${{ matrix.ganache-version }}
 
-    - name: Installing Python packages
+    - name: Installing Solc compiler
       run: |
-        python3 -m pip install --requirement ${{ github.workspace }}/utils/gas_cost_eval_requirements.txt
+        mkdir -p ${{ github.workspace }}/build/
+        curl -fsSL -o ${SOLC_BIN} \
+          https://github.com/ethereum/solidity/releases/download/${{ matrix.solc-version }}/solc-static-linux
+        chmod +x ${SOLC_BIN}
 
     - name: Compiling contracts for PubSub/EventManager.sol
       run: |
-        solcjs  ${{ matrix.opt-flags }} --bin --include-path node_modules/ --base-path . --output-dir ./build/ ./PubSub/EventManager.sol
-        solcjs  ${{ matrix.opt-flags }} --abi --include-path node_modules/ --base-path . --output-dir ./build/ ./PubSub/EventManager.sol
-        mv ./build/PubSub_EventManager_sol_EventManager.bin   ./build/EventManager.bin
-        mv ./build/PubSub_EventManager_sol_EventManager.abi   ./build/EventManager.abi
+        ${SOLC_BIN} ${SOLC_FLAGS} --bin ${{ github.workspace }}/PubSub/EventManager.sol
+        ${SOLC_BIN} ${SOLC_FLAGS} --abi ${{ github.workspace }}/PubSub/EventManager.sol
 
     - name: Compiling contracts for PubSub/PubSubService.sol
       run: |
-        solcjs  ${{ matrix.opt-flags }} --bin --include-path node_modules/ --base-path . --output-dir ./build/ ./PubSub/PubSubService.sol
-        solcjs  ${{ matrix.opt-flags }} --abi --include-path node_modules/ --base-path . --output-dir ./build/ ./PubSub/PubSubService.sol
-        mv ./build/PubSub_PubSubService_sol_PubSubService.bin ./build/PubSubService.bin
-        mv ./build/PubSub_PubSubService_sol_PubSubService.abi ./build/PubSubService.abi
+        ${SOLC_BIN} ${SOLC_FLAGS} --bin ${{ github.workspace }}/PubSub/PubSubService.sol
+        ${SOLC_BIN} ${SOLC_FLAGS} --abi ${{ github.workspace }}/PubSub/PubSubService.sol
 
     - name: Compiling contracts for tests/HelloWorldSubscriber.sol
       run: |
-        solcjs  ${{ matrix.opt-flags }} --bin --include-path node_modules/ --base-path . --output-dir ./build/ ./tests/HelloWorldSubscriber.sol
-        solcjs  ${{ matrix.opt-flags }} --abi --include-path node_modules/ --base-path . --output-dir ./build/ ./tests/HelloWorldSubscriber.sol
-        mv ./build/tests_HelloWorldSubscriber_sol_HelloWorldSubscriber.bin ./build/HelloWorldSubscriber.bin
-        mv ./build/tests_HelloWorldSubscriber_sol_HelloWorldSubscriber.abi ./build/HelloWorldSubscriber.abi
+        ${SOLC_BIN} ${SOLC_FLAGS} --bin ${{ github.workspace }}/tests/HelloWorldSubscriber.sol
+        ${SOLC_BIN} ${SOLC_FLAGS} --abi ${{ github.workspace }}/tests/HelloWorldSubscriber.sol
 
     - name: Compiling contracts for tests/HelloWorldPublisher.sol
       run: |
-        solcjs  ${{ matrix.opt-flags }} --bin --include-path node_modules/ --base-path . --output-dir ./build/ ./tests/HelloWorldPublisher.sol
-        solcjs  ${{ matrix.opt-flags }} --abi --include-path node_modules/ --base-path . --output-dir ./build/ ./tests/HelloWorldPublisher.sol
-        mv ./build/tests_HelloWorldPublisher_sol_HelloWorldPublisher.bin   ./build/HelloWorldPublisher.bin
-        mv ./build/tests_HelloWorldPublisher_sol_HelloWorldPublisher.abi   ./build/HelloWorldPublisher.abi
+        ${SOLC_BIN} ${SOLC_FLAGS} --bin ${{ github.workspace }}/tests/HelloWorldPublisher.sol
+        ${SOLC_BIN} ${SOLC_FLAGS} --abi ${{ github.workspace }}/tests/HelloWorldPublisher.sol
 
     - name: Calculating checksums of the binary
+      working-directory: ${{ github.workspace }}/build
       run: |
-        sha256sum ./build/EventManager.bin  >> ./build/checksums.txt
-        sha256sum ./build/EventManager.abi  >> ./build/checksums.txt
-        sha256sum ./build/PubSubService.bin >> ./build/checksums.txt
-        sha256sum ./build/PubSubService.abi >> ./build/checksums.txt
-        sha256sum ./build/HelloWorldPublisher.bin  >> ./build/checksums.txt
-        sha256sum ./build/HelloWorldPublisher.abi  >> ./build/checksums.txt
-        sha256sum ./build/HelloWorldSubscriber.bin >> ./build/checksums.txt
-        sha256sum ./build/HelloWorldSubscriber.abi >> ./build/checksums.txt
+        sha256sum solc-static-linux        >> checksums.txt
+        sha256sum EventManager.bin         >> checksums.txt
+        sha256sum EventManager.abi         >> checksums.txt
+        sha256sum PubSubService.bin        >> checksums.txt
+        sha256sum PubSubService.abi        >> checksums.txt
+        sha256sum HelloWorldPublisher.bin  >> checksums.txt
+        sha256sum HelloWorldPublisher.abi  >> checksums.txt
+        sha256sum HelloWorldSubscriber.bin >> checksums.txt
+        sha256sum HelloWorldSubscriber.abi >> checksums.txt
 
     - name: Prepare binaries for gas cost evaluation
+      working-directory: ${{ github.workspace }}/build
       run: |
-        mkdir -p ./build/PubSub
-        cp ./build/EventManager.bin  ./build/PubSub/EventManager.bin
-        cp ./build/EventManager.abi  ./build/PubSub/EventManager.abi
-        cp ./build/PubSubService.bin ./build/PubSub/PubSubService.bin
-        cp ./build/PubSubService.abi ./build/PubSub/PubSubService.abi
-        mkdir -p ./build/tests
-        cp ./build/HelloWorldPublisher.bin  ./build/tests/HelloWorldPublisher.bin
-        cp ./build/HelloWorldPublisher.abi  ./build/tests/HelloWorldPublisher.abi
-        cp ./build/HelloWorldSubscriber.bin ./build/tests/HelloWorldSubscriber.bin
-        cp ./build/HelloWorldSubscriber.abi ./build/tests/HelloWorldSubscriber.abi
+        mkdir -p PubSub
+        cp EventManager.bin  PubSub/EventManager.bin
+        cp EventManager.abi  PubSub/EventManager.abi
+        cp PubSubService.bin PubSub/PubSubService.bin
+        cp PubSubService.abi PubSub/PubSubService.abi
+        mkdir -p tests
+        cp HelloWorldPublisher.bin  tests/HelloWorldPublisher.bin
+        cp HelloWorldPublisher.abi  tests/HelloWorldPublisher.abi
+        cp HelloWorldSubscriber.bin tests/HelloWorldSubscriber.bin
+        cp HelloWorldSubscriber.abi tests/HelloWorldSubscriber.abi
 
     - name: Run publish gas cost evaluation
       run: |
@@ -107,40 +122,59 @@ jobs:
       run: |
         python3 ${{ github.workspace }}/tests/GasCostEvalMultiPubs.py
 
+    - name: Run deployment gas cost evaluation
+      run: |
+        python3 ${{ github.workspace }}/tests/GasCostEvalDeploy.py
+
     - name: Plot gas cost evaluation result figures
       run: |
         python3 ${{ github.workspace }}/tests/GasCostEvalPlot.py
 
     - name: Generate release note
+      working-directory: ${{ github.workspace }}/build
       run: |
-        echo "# Release note"                   >> ./build/release_note.md
-        echo "## Contracts"                     >> ./build/release_note.md
-        echo "- PubSub/EventManager.sol"        >> ./build/release_note.md
-        echo "- PubSub/PubSubService.sol"       >> ./build/release_note.md
-        echo "- tests/HelloWorldPublisher.sol"  >> ./build/release_note.md
-        echo "- tests/HelloWorldSubscriber.sol" >> ./build/release_note.md
-        echo "" >> ./build/release_note.md
-        echo "## Build configurations"                      >> ./build/release_note.md
-        echo "- OS: \`${{ matrix.os }}\`"                   >> ./build/release_note.md
-        echo "- Node version: \`$(node --version)\`"        >> ./build/release_note.md
-        echo "- Solc version: \`$(solcjs --version)\`"      >> ./build/release_note.md
-        echo "- Optimizations: \`${{ matrix.opt-flags }}\`" >> ./build/release_note.md
-        echo "" >> ./build/release_note.md
-        echo "## Checksums"       >> ./build/release_note.md
-        echo "\`\`\`"             >> ./build/release_note.md
-        cat ./build/checksums.txt >> ./build/release_note.md
-        echo "\`\`\`"             >> ./build/release_note.md
-        echo "" >> ./build/release_note.md
-        echo "## Gas Cost Evaluations" >> ./build/release_note.md
-        echo "### Gas Cost of Publishing Events"         >> ./build/release_note.md
-        echo ""                                          >> ./build/release_note.md
-        echo '!'"[publish_gas_cost](/../../blob/assets-gas-eval/assets/${{ github.ref_name }}-publish_gas_cost.svg)"     >> ./build/release_note.md
-        echo ""                                          >> ./build/release_note.md
-        echo "### Gas cost of Subscribing to Publishers" >> ./build/release_note.md
-        echo ""                                          >> ./build/release_note.md
-        echo '!'"[subscribe_gas_cost](/../../blob/assets-gas-eval/assets/${{ github.ref_name }}-subscribe_gas_cost.svg)" >> ./build/release_note.md
-        echo ""                                          >> ./build/release_note.md
-        echo "" >> ./build/release_note.md
+        echo "# Release note"                   >> ${RELE_NOTE}
+        echo "" >> ${RELE_NOTE}
+        echo "## Contracts"                     >> ${RELE_NOTE}
+        echo "- PubSub/EventManager.sol"        >> ${RELE_NOTE}
+        echo "- PubSub/PubSubService.sol"       >> ${RELE_NOTE}
+        echo "- tests/HelloWorldPublisher.sol"  >> ${RELE_NOTE}
+        echo "- tests/HelloWorldSubscriber.sol" >> ${RELE_NOTE}
+        echo "" >> ${RELE_NOTE}
+        echo "## Build configurations"                          >> ${RELE_NOTE}
+        echo "- OS: \`${{ matrix.os }}\`"                       >> ${RELE_NOTE}
+        echo "- Solc version: \`$(bash -c "${SOLC_VER_CMD}")\`" >> ${RELE_NOTE}
+        echo "- Compiler Flags: \`${SOLC_FLAGS}\`"              >> ${RELE_NOTE}
+        echo "" >> ${RELE_NOTE}
+        echo "## Checksums"       >> ${RELE_NOTE}
+        echo "\`\`\`"             >> ${RELE_NOTE}
+        cat checksums.txt         >> ${RELE_NOTE}
+        echo "\`\`\`"             >> ${RELE_NOTE}
+        echo "" >> ${RELE_NOTE}
+        echo "## Gas Cost Evaluations" >> ${RELE_NOTE}
+        echo "### Gas Cost of Publishing Events"         >> ${RELE_NOTE}
+        echo ""                                          >> ${RELE_NOTE}
+        echo '!'"[publish_gas_cost](/../../blob/assets-gas-eval/assets/${{ github.ref_name }}-publish_gas_cost.svg)"     >> ${RELE_NOTE}
+        echo ""                                          >> ${RELE_NOTE}
+        echo "### Gas Cost of Publisher Registeration"   >> ${RELE_NOTE}
+        echo ""                                          >> ${RELE_NOTE}
+        echo '!'"[register_gas_cost](/../../blob/assets-gas-eval/assets/${{ github.ref_name }}-register_gas_cost.svg)" >> ${RELE_NOTE}
+        echo ""                                          >> ${RELE_NOTE}
+        echo "### Gas Cost of Subscribing to Publishers" >> ${RELE_NOTE}
+        echo ""                                          >> ${RELE_NOTE}
+        echo '!'"[subscribe_gas_cost](/../../blob/assets-gas-eval/assets/${{ github.ref_name }}-subscribe_gas_cost.svg)" >> ${RELE_NOTE}
+        echo ""                                          >> ${RELE_NOTE}
+        echo "### Gas Cost of Contract Deployment"       >> ${RELE_NOTE}
+        echo "\`\`\`json"                                >> ${RELE_NOTE}
+        cat deploy_gas_cost.json                         >> ${RELE_NOTE}
+        echo ""                                          >> ${RELE_NOTE}
+        echo "\`\`\`"                                    >> ${RELE_NOTE}
+        echo ""                                          >> ${RELE_NOTE}
+        echo "### Gas Cost Summary"                      >> ${RELE_NOTE}
+        echo ""                                          >> ${RELE_NOTE}
+        echo '!'"[gas_cost](/../../blob/assets-gas-eval/assets/${{ github.ref_name }}-gas_cost.svg)" >> ${RELE_NOTE}
+        echo ""                                          >> ${RELE_NOTE}
+        echo "" >> ${RELE_NOTE}
 
     - name: Echo release note
       run: |
@@ -165,6 +199,9 @@ jobs:
           ${{ github.workspace }}/build/publish_gas_cost.json
           ${{ github.workspace }}/build/subscribe_gas_cost.svg
           ${{ github.workspace }}/build/subscribe_gas_cost.json
+          ${{ github.workspace }}/build/register_gas_cost.svg
+          ${{ github.workspace }}/build/register_gas_cost.json
+          ${{ github.workspace }}/build/deploy_gas_cost.json
           ${{ github.workspace }}/build/gas_cost.svg
 
     - name: Store evaluation figures to assets branch
@@ -182,6 +219,11 @@ jobs:
             --path "assets/${{ github.ref_name }}-subscribe_gas_cost.svg" \
             --commit-msg "Uploaded file assets/${{ github.ref_name }}-subscribe_gas_cost.svg" \
             --file "${{ github.workspace }}/build/subscribe_gas_cost.svg"
+        python3 ${{ github.workspace }}/utils/GitHubCreateFile.py \
+            --branch assets-gas-eval \
+            --path "assets/${{ github.ref_name }}-register_gas_cost.svg" \
+            --commit-msg "Uploaded file assets/${{ github.ref_name }}-register_gas_cost.svg" \
+            --file "${{ github.workspace }}/build/register_gas_cost.svg"
         python3 ${{ github.workspace }}/utils/GitHubCreateFile.py \
             --branch assets-gas-eval \
             --path "assets/${{ github.ref_name }}-gas_cost.svg" \
@@ -206,3 +248,7 @@ jobs:
           ${{ github.workspace }}/build/publish_gas_cost.json
           ${{ github.workspace }}/build/subscribe_gas_cost.svg
           ${{ github.workspace }}/build/subscribe_gas_cost.json
+          ${{ github.workspace }}/build/register_gas_cost.svg
+          ${{ github.workspace }}/build/register_gas_cost.json
+          ${{ github.workspace }}/build/deploy_gas_cost.json
+          ${{ github.workspace }}/build/gas_cost.svg
diff --git a/.github/workflows/pubsub-solidity-unittesting.yaml b/.github/workflows/pubsub-solidity-unittesting.yaml
index fed5a08..80c3e12 100644
--- a/.github/workflows/pubsub-solidity-unittesting.yaml
+++ b/.github/workflows/pubsub-solidity-unittesting.yaml
@@ -16,15 +16,24 @@ on:
 
 jobs:
   run_sol_contracts_job:
-    runs-on: ubuntu-22.04
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ ubuntu-22.04 ]
+        solc-version: [ 0.8.20 ]
+        chain-fork: [ shanghai ]
+        opt-runs: [ 200 ]
+
     name: A job to run solidity unit tests on github actions CI
     steps:
     - name: Checkout
       uses: actions/checkout@v3
+
     - name: Run Solidity Unit Testing Action
       uses: EthereumRemix/sol-test@v1.1
       with:
         test-path: 'tests/PubSub'
-        compiler-version: '0.8.19'
+        compiler-version: ${{ matrix.solc-version }}
         optimize: true
-        optimizer-runs: 200
+        optimizer-runs: ${{ matrix.opt-runs }}
+        hard-fork: ${{ matrix.chain-fork }}
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..362210f
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,4 @@
+[submodule "utils/PyEthHelper"]
+	path = utils/PyEthHelper
+	url = https://github.com/lsd-ucsc/PyEthHelper.git
+	branch = main
diff --git a/Makefile b/Makefile
index 1a13dd5..c3945f4 100644
--- a/Makefile
+++ b/Makefile
@@ -1,16 +1,24 @@
-NODEENV_CONFIG := ./utils/nodeenv.ini
-NODEENV_REQ    := ./utils/nodeenv-requirements.txt
 MODULES        := \
 	PubSub \
 	tests
+SOLC_VERSION   := v0.8.20
+MKFILE_PATH    := $(abspath $(lastword $(MAKEFILE_LIST)))
+CURRENT_DIR    := $(dir $(MKFILE_PATH))
+SOLC_BIN       := $(CURRENT_DIR)/build/solc-static-linux
 
 
-all: build/nodeenv.state $(MODULES)
+all: $(SOLC_BIN) $(MODULES)
 
 
-build/nodeenv.state: $(NODEENV_CONFIG) $(NODEENV_REQ)
-	nodeenv --config=$(NODEENV_CONFIG) --requirements=$(NODEENV_REQ) build/nodeenv
-	touch $@
+$(SOLC_BIN):
+	mkdir -p $(dir $(SOLC_BIN)) && \
+	curl -fsSL -o $(SOLC_BIN) \
+		https://github.com/ethereum/solidity/releases/download/$(SOLC_VERSION)/solc-static-linux \
+		&& \
+	chmod +x $(SOLC_BIN)
+
+
+solc_bin: $(SOLC_BIN)
 
 
 $(MODULES):
@@ -22,7 +30,7 @@ $(addprefix clean_,$(MODULES)):
 
 
 clean: $(addprefix clean_,$(MODULES))
-	rm -rf build/nodeenv build/nodeenv.state
+	rm -rf $(SOLC_BIN)
 
 
-.PHONY: all clean $(MODULES) $(addprefix clean_,$(MODULES))
+.PHONY: all clean solc_bin $(MODULES) $(addprefix clean_,$(MODULES))
diff --git a/PubSub/EventManager.sol b/PubSub/EventManager.sol
index 2a8923e..df2e416 100644
--- a/PubSub/EventManager.sol
+++ b/PubSub/EventManager.sol
@@ -75,29 +75,11 @@ contract EventManager {
         });
     }
 
-    /**
-     * Notify all subscribers
-     * @param data The data to send to the subscribers
-     * @dev The immediate caller must be a publisher
-     */
-    function notifySubscribers(bytes memory data) external {
-        // 1. Make sure the entrance lock is free
-        require(
-            !m_entranceLock,
-            "Entrance lock is engaged"
-        );
-        m_entranceLock = true;
-
-        // 2. Make sure the caller is a publisher
-        require(
-            m_publisherMap[msg.sender],
-            "Only registered publisher can notify"
-        );
-
-        // 3. Get gas price (Wei per gas unit) that we want to reimburse
+    function notifyOnChainSubscribers(bytes memory data) private {
+        // 1. Get gas price (Wei per gas unit) that we want to reimburse
         uint256 gasPriceWei = tx.gasprice;
 
-        // 4. maintain running track of how much to compensate tx.origin
+        // 2. maintain running track of how much to compensate tx.origin
         uint256 compensateWei = 0;
 
         uint256 numSubscribers   = m_subscriberAddrs.length;
@@ -107,7 +89,7 @@ contract EventManager {
         uint256 costWei   = 0;
         uint256 limitGas  = 0;
 
-        // 5. Make sure the specified gas limit is enough for all subscribers's
+        // 3. Make sure the specified gas limit is enough for all subscribers's
         //    max gas limit
         require(
             gasleft() >= ((m_perSubLimitGas * numSubscribers) +
@@ -116,7 +98,7 @@ contract EventManager {
         );
         uint fairLimitGas = (gasleft() - FINISHING_COST_GAS) / numSubscribers;
 
-        // 6. Notify all subscribers and reimburse the sender for the gas used
+        // 4. Notify all subscribers and reimburse the sender for the gas used
         for (uint256 i = 0; i < numSubscribers; i++) {
             address subscriberAddr = m_subscriberAddrs[i];
             // get a reference to the mapped subscriber
@@ -155,11 +137,36 @@ contract EventManager {
 
         // reimburse the user who invoked this entire transaction
         payable(tx.origin).transfer(compensateWei);
+    }
+
+    /**
+     * Notify all subscribers
+     * @param data The data to send to the subscribers
+     * @dev The immediate caller must be a publisher
+     */
+    function notifySubscribers(bytes memory data) external {
+        // 1. Make sure the entrance lock is free
+        require(
+            !m_entranceLock,
+            "Entrance lock is engaged"
+        );
+        m_entranceLock = true;
+
+        // 2. Make sure the caller is a publisher
+        require(
+            m_publisherMap[msg.sender],
+            "Only registered publisher can notify"
+        );
+
+        // 3. notify all on-chain subscribers if there is any
+        if (m_subscriberAddrs.length > 0) {
+            notifyOnChainSubscribers(data);
+        }
 
-        // 5. Release the entrance lock
+        // 4. Release the entrance lock
         m_entranceLock = false;
 
-        // 4. emit the event for off-chain subscribers
+        // 5. emit the event for off-chain subscribers
         emit NotifySubscribers(data);
     }
 
diff --git a/PubSub/Makefile b/PubSub/Makefile
index 98b120a..b253d76 100644
--- a/PubSub/Makefile
+++ b/PubSub/Makefile
@@ -3,61 +3,61 @@ CONTRACTS   := \
 	EventManager \
 	PubSubService
 
+MKFILE_PATH  := $(abspath $(lastword $(MAKEFILE_LIST)))
+CURRENT_DIR  := $(dir $(MKFILE_PATH))
+ROOT_DIR     := $(CURRENT_DIR)/..
+BUILD_DIR    := $(ROOT_DIR)/build
+
+SOLC_BIN     := $(BUILD_DIR)/solc-static-linux
+OPTIMIZE_RUN := 200
+SOLC_FLAGS   := --optimize --optimize-runs $(OPTIMIZE_RUN) \
+				--revert-strings strip \
+				--via-ir \
+				--overwrite \
+				--base-path $(ROOT_DIR) \
+				--output-dir $(BUILD_DIR)/$(MODULE_NAME)/all/
+
 CHECKSUM_BIN := openssl sha256
 
 
-all:    $(addprefix ../build/$(MODULE_NAME)/,$(addsuffix .abi,$(CONTRACTS))) \
-		$(addprefix ../build/$(MODULE_NAME)/,$(addsuffix .bin,$(CONTRACTS))) \
-		$(addprefix ../build/$(MODULE_NAME)/,checksums.txt)
+all: $(CONTRACTS) checksums
 
 
-../build/nodeenv.state:
-	$(MAKE) -C .. build/nodeenv.state
+$(SOLC_BIN):
+	$(MAKE) -C .. solc_bin
 
 
-../build/$(MODULE_NAME)/%.bin: %.sol ../build/nodeenv.state
+$(BUILD_DIR)/$(MODULE_NAME)/%.bin: %.sol $(SOLC_BIN)
 	( \
-		. ../build/nodeenv/bin/activate && \
-		solcjs  --optimize --optimize-runs 200 \
-				--bin \
-				--include-path node_modules/ --base-path .. \
-				--output-dir ../build/$(MODULE_NAME)/ \
-				$< && \
-		mv  ../build/$(MODULE_NAME)/$(MODULE_NAME)_$(basename $<)_sol_$(basename $<).bin \
-			../build/$(MODULE_NAME)/$(basename $<).bin && \
-		rm  -f ../build/$(MODULE_NAME)/*_sol_*.bin \
+		$(SOLC_BIN) --bin $(SOLC_FLAGS) $< && \
+		cp  $(BUILD_DIR)/$(MODULE_NAME)/all/$(basename $<).bin \
+			$(BUILD_DIR)/$(MODULE_NAME)/$(basename $<).bin \
 	)
 
 
-../build/$(MODULE_NAME)/%.abi: %.sol ../build/nodeenv.state
+$(BUILD_DIR)/$(MODULE_NAME)/%.abi: %.sol $(SOLC_BIN)
 	( \
-		. ../build/nodeenv/bin/activate && \
-		solcjs  --optimize --optimize-runs 200 \
-				--abi \
-				--include-path node_modules/ --base-path .. \
-				--output-dir ../build/$(MODULE_NAME)/ \
-				$< && \
-		mv  ../build/$(MODULE_NAME)/$(MODULE_NAME)_$(basename $<)_sol_$(basename $<).abi \
-			../build/$(MODULE_NAME)/$(basename $<).abi && \
-		rm  -f ../build/$(MODULE_NAME)/*_sol_*.abi \
+		$(SOLC_BIN) --abi $(SOLC_FLAGS) $< && \
+		cp  $(BUILD_DIR)/$(MODULE_NAME)/all/$(basename $<).abi \
+			$(BUILD_DIR)/$(MODULE_NAME)/$(basename $<).abi \
 	)
 
 
-../build/$(MODULE_NAME)/checksums.txt:  $(addprefix ../build/$(MODULE_NAME)/,$(addsuffix .abi,$(CONTRACTS))) \
-										$(addprefix ../build/$(MODULE_NAME)/,$(addsuffix .bin,$(CONTRACTS)))
+$(CONTRACTS): %: $(BUILD_DIR)/$(MODULE_NAME)/%.abi $(BUILD_DIR)/$(MODULE_NAME)/%.bin
+
+
+$(BUILD_DIR)/$(MODULE_NAME)/checksums.txt: $(CONTRACTS)
 	( \
-		cd ../build/$(MODULE_NAME); \
+		cd $(BUILD_DIR)/$(MODULE_NAME); \
 		$(CHECKSUM_BIN) $(addsuffix .abi,$(CONTRACTS)) $(addsuffix .bin,$(CONTRACTS)) > checksums.txt; \
 	)
 
 
-checksums: ../build/$(MODULE_NAME)/checksums.txt
+checksums: $(BUILD_DIR)/$(MODULE_NAME)/checksums.txt
 
 
 clean:
-	rm -f   $(addprefix ../build/$(MODULE_NAME)/,$(addsuffix .abi,$(CONTRACTS))) \
-			$(addprefix ../build/$(MODULE_NAME)/,$(addsuffix .bin,$(CONTRACTS))) \
-			$(addprefix ../build/$(MODULE_NAME)/,checksums.txt)
+	rm -rf $(BUILD_DIR)/$(MODULE_NAME)/
 
 
-.PHONY: all clean checksums
+.PHONY: all clean checksums $(CONTRACTS)
diff --git a/tests/GasCostEvalDeploy.py b/tests/GasCostEvalDeploy.py
new file mode 100644
index 0000000..2df8193
--- /dev/null
+++ b/tests/GasCostEvalDeploy.py
@@ -0,0 +1,136 @@
+#!/usr/bin/env python3
+# -*- coding:utf-8 -*-
+###
+# Copyright (c) 2023 Roy Shadmon, Haofan Zheng
+# Use of this source code is governed by an MIT-style
+# license that can be found in the LICENSE file or at
+# https://opensource.org/licenses/MIT.
+###
+
+
+import json
+import os
+import signal
+import subprocess
+import sys
+import time
+
+from web3 import Web3
+
+
+BASE_DIR_PATH       = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+BUILD_DIR_PATH      = os.path.join(BASE_DIR_PATH, 'build')
+UTILS_DIR_PATH      = os.path.join(BASE_DIR_PATH, 'utils')
+PYHELPER_DIR        = os.path.join(UTILS_DIR_PATH, 'PyEthHelper')
+PROJECT_CONFIG_PATH = os.path.join(UTILS_DIR_PATH, 'project_conf.json')
+CHECKSUM_KEYS_PATH  = os.path.join(BUILD_DIR_PATH, 'ganache_keys_checksum.json')
+GANACHE_KEYS_PATH   = os.path.join(BUILD_DIR_PATH, 'ganache_keys.json')
+GANACHE_PORT        = 7545
+NUM_OF_ACCOUNTS     = 100
+GANACHE_NET_ID      = 1337
+
+
+sys.path.append(PYHELPER_DIR)
+from PyEthHelper import EthContractHelper
+from PyEthHelper import GanacheAccounts
+
+
+def StartGanache() -> subprocess.Popen:
+	cmd = [
+		'ganache-cli',
+		'-p', str(GANACHE_PORT),
+		'-d',
+		'-a', str(NUM_OF_ACCOUNTS),
+		'--network-id', str(GANACHE_NET_ID),
+		'--chain.hardfork', 'shanghai',
+		'--wallet.accountKeysPath', str(GANACHE_KEYS_PATH),
+	]
+	proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+
+	return proc
+
+
+def RunTests() -> dict:
+	# connect to ganache
+	ganacheUrl = 'http://localhost:{}'.format(GANACHE_PORT)
+	w3 = Web3(Web3.HTTPProvider(ganacheUrl))
+	while not w3.is_connected():
+		print('Attempting to connect to ganache...')
+		time.sleep(1)
+	print('Connected to ganache')
+
+	deployCosts = {}
+
+	# checksum keys
+	GanacheAccounts.ChecksumGanacheKeysFile(
+		CHECKSUM_KEYS_PATH,
+		GANACHE_KEYS_PATH
+	)
+
+	# setup account
+	privKey = EthContractHelper.SetupSendingAccount(
+		w3=w3,
+		account=0,
+		keyJson=CHECKSUM_KEYS_PATH
+	)
+
+	# deploy PubSub contract
+	print('Deploying PubSub contract...')
+	pubSubContract = EthContractHelper.LoadContract(
+		w3=w3,
+		projConf=PROJECT_CONFIG_PATH,
+		contractName='PubSubService',
+		release=None, # use locally built contract
+		address=None, # deploy new contract
+	)
+	pubSubReceipt = EthContractHelper.DeployContract(
+		w3=w3,
+		contract=pubSubContract,
+		arguments=[ ],
+		privKey=privKey,
+		gas=None, # let web3 estimate
+		value=0,
+		confirmPrompt=False # don't prompt for confirmation
+	)
+	deployCosts['deployPubSub'] = pubSubReceipt.gasUsed
+	pubSubAddr = pubSubReceipt.contractAddress
+	print('PubSub contract deployed at {}'.format(pubSubAddr))
+
+	return deployCosts
+
+
+def StopGanache(ganacheProc: subprocess.Popen) -> None:
+	print('Shutting down ganache (it may take ~15 seconds)...')
+	waitEnd = time.time() + 20
+	ganacheProc.terminate()
+	while ganacheProc.poll() is None:
+		try:
+			if time.time() > waitEnd:
+				print('Force to shut down ganache')
+				ganacheProc.kill()
+			else:
+				print('Still waiting for ganache to shut down...')
+				ganacheProc.send_signal(signal.SIGINT)
+			ganacheProc.wait(timeout=2)
+		except subprocess.TimeoutExpired:
+			continue
+	print('Ganache has been shut down')
+
+
+def main():
+	ganacheProc = StartGanache()
+
+	try:
+		deployCosts = RunTests()
+
+		# save results
+		outputFile = os.path.join(BUILD_DIR_PATH, 'deploy_gas_cost.json')
+		with open(outputFile, 'w') as f:
+			json.dump(deployCosts, f, indent='\t')
+
+	finally:
+		# finish and exit
+		StopGanache(ganacheProc)
+
+if __name__ == "__main__":
+	main()
diff --git a/tests/GasCostEvalMultiPubs.py b/tests/GasCostEvalMultiPubs.py
index 72fdef0..914fe71 100644
--- a/tests/GasCostEvalMultiPubs.py
+++ b/tests/GasCostEvalMultiPubs.py
@@ -23,14 +23,18 @@
 BASE_DIR_PATH       = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 BUILD_DIR_PATH      = os.path.join(BASE_DIR_PATH, 'build')
 UTILS_DIR_PATH      = os.path.join(BASE_DIR_PATH, 'utils')
+PYHELPER_DIR        = os.path.join(UTILS_DIR_PATH, 'PyEthHelper')
 PROJECT_CONFIG_PATH = os.path.join(UTILS_DIR_PATH, 'project_conf.json')
-CHECKSUM_KEYS_PATH  = os.path.join(UTILS_DIR_PATH, 'ganache_keys_checksum.json')
-GANACHE_KEYS_PATH   = os.path.join(UTILS_DIR_PATH, 'ganache_keys.json')
+CHECKSUM_KEYS_PATH  = os.path.join(BUILD_DIR_PATH, 'ganache_keys_checksum.json')
+GANACHE_KEYS_PATH   = os.path.join(BUILD_DIR_PATH, 'ganache_keys.json')
 GANACHE_PORT        = 7545
 NUM_OF_ACCOUNTS     = 100
+GANACHE_NET_ID      = 1337
 
-sys.path.append(UTILS_DIR_PATH)
-import EthContractHelper
+
+sys.path.append(PYHELPER_DIR)
+from PyEthHelper import EthContractHelper
+from PyEthHelper import GanacheAccounts
 
 
 def StartGanache() -> subprocess.Popen:
@@ -39,8 +43,9 @@ def StartGanache() -> subprocess.Popen:
 		'-p', str(GANACHE_PORT),
 		'-d',
 		'-a', str(NUM_OF_ACCOUNTS),
-		'--network-id', '1337',
-		'--wallet.accountKeysPath', GANACHE_KEYS_PATH,
+		'--network-id', str(GANACHE_NET_ID),
+		'--chain.hardfork', 'shanghai',
+		'--wallet.accountKeysPath', str(GANACHE_KEYS_PATH),
 	]
 	proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
 
@@ -60,7 +65,7 @@ def SelectRandomAccount(
 	)
 
 
-def RunTests() -> List[Tuple[int, int]]:
+def RunTests() -> Tuple[List[Tuple[int, int]], List[Tuple[int, int]]]:
 	maxNumPublishers = 20
 
 	# connect to ganache
@@ -71,10 +76,17 @@ def RunTests() -> List[Tuple[int, int]]:
 		time.sleep(1)
 	print('Connected to ganache')
 
+	# checksum keys
+	GanacheAccounts.ChecksumGanacheKeysFile(
+		CHECKSUM_KEYS_PATH,
+		GANACHE_KEYS_PATH
+	)
+
 	# setup account
 	privKey = SelectRandomAccount(w3)
 
 
+	registerCost = []
 	subscribeCost = []
 
 
@@ -114,6 +126,7 @@ def RunTests() -> List[Tuple[int, int]]:
 		)
 
 		publishers = []
+		regCosts = []
 		print('Deploying {} publishers...'.format(numPublishers))
 		for pubIndex in range(0, numPublishers):
 			# choose a random account to deploy from
@@ -151,7 +164,7 @@ def RunTests() -> List[Tuple[int, int]]:
 
 			# register publisher
 			# print('Registering publisher...')
-			EthContractHelper.CallContractFunc(
+			regTxReceipt = EthContractHelper.CallContractFunc(
 				w3=w3,
 				contract=publisherContract,
 				funcName='register',
@@ -161,10 +174,18 @@ def RunTests() -> List[Tuple[int, int]]:
 				value=0,
 				confirmPrompt=False # don't prompt for confirmation
 			)
+			regCosts.append(regTxReceipt.gasUsed)
+			print('Register gas used: {}'.format(regTxReceipt.gasUsed))
 
 			publishers.append(publisherContract)
 
-		costs = []
+		# record register gas used
+		registerCost.append((
+			numPublishers,
+			sum(regCosts) / len(regCosts), # average gas cost
+		))
+
+		subsCosts = []
 		for publisherContract in publishers:
 			publisherAddr = publisherContract.address
 
@@ -242,16 +263,16 @@ def RunTests() -> List[Tuple[int, int]]:
 				publisherAddr
 			))
 
-			costs.append(subTxReceipt.gasUsed)
+			subsCosts.append(subTxReceipt.gasUsed)
 			print('Gas used: {}'.format(subTxReceipt.gasUsed))
 
-		# record gas used
+		# record subscribe gas used
 		subscribeCost.append((
 			numPublishers,
-			sum(costs) / len(costs), # average gas cost
+			sum(subsCosts) / len(subsCosts), # average gas cost
 		))
 
-	return subscribeCost
+	return registerCost, subscribeCost
 
 
 def StopGanache(ganacheProc: subprocess.Popen) -> None:
@@ -276,21 +297,26 @@ def main():
 	ganacheProc = StartGanache()
 
 	try:
-		gasResults = []
+		regGasResults = []
+		subsGasResults = []
 
 		for _ in range(3):
-			subscribeCost = RunTests()
+			registerCost, subscribeCost = RunTests()
 
-			print('Subscribe gas cost results:')
-			for cost in subscribeCost:
-				print('{:03} publishers: {:010.2f} gas'.format(cost[0], cost[1]))
+			# print('Subscribe gas cost results:')
+			# for cost in subscribeCost:
+			# 	print('{:03} publishers: {:010.2f} gas'.format(cost[0], cost[1]))
 
-			gasResults.append(subscribeCost)
+			regGasResults.append(registerCost)
+			subsGasResults.append(subscribeCost)
 
 		# save results
 		outputFile = os.path.join(BUILD_DIR_PATH, 'subscribe_gas_cost.json')
 		with open(outputFile, 'w') as f:
-			json.dump(gasResults, f, indent='\t')
+			json.dump(subsGasResults, f, indent='\t')
+		outputFile = os.path.join(BUILD_DIR_PATH, 'register_gas_cost.json')
+		with open(outputFile, 'w') as f:
+			json.dump(regGasResults, f, indent='\t')
 
 	finally:
 		# finish and exit
diff --git a/tests/GasCostEvalMultiSubs.py b/tests/GasCostEvalMultiSubs.py
index 2bf0b97..7a51450 100644
--- a/tests/GasCostEvalMultiSubs.py
+++ b/tests/GasCostEvalMultiSubs.py
@@ -23,14 +23,18 @@
 BASE_DIR_PATH       = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 BUILD_DIR_PATH      = os.path.join(BASE_DIR_PATH, 'build')
 UTILS_DIR_PATH      = os.path.join(BASE_DIR_PATH, 'utils')
+PYHELPER_DIR        = os.path.join(UTILS_DIR_PATH, 'PyEthHelper')
 PROJECT_CONFIG_PATH = os.path.join(UTILS_DIR_PATH, 'project_conf.json')
-CHECKSUM_KEYS_PATH  = os.path.join(UTILS_DIR_PATH, 'ganache_keys_checksum.json')
-GANACHE_KEYS_PATH   = os.path.join(UTILS_DIR_PATH, 'ganache_keys.json')
+CHECKSUM_KEYS_PATH  = os.path.join(BUILD_DIR_PATH, 'ganache_keys_checksum.json')
+GANACHE_KEYS_PATH   = os.path.join(BUILD_DIR_PATH, 'ganache_keys.json')
 GANACHE_PORT        = 7545
 NUM_OF_ACCOUNTS     = 100
+GANACHE_NET_ID      = 1337
 
-sys.path.append(UTILS_DIR_PATH)
-import EthContractHelper
+
+sys.path.append(PYHELPER_DIR)
+from PyEthHelper import EthContractHelper
+from PyEthHelper import GanacheAccounts
 
 
 def StartGanache() -> subprocess.Popen:
@@ -39,8 +43,9 @@ def StartGanache() -> subprocess.Popen:
 		'-p', str(GANACHE_PORT),
 		'-d',
 		'-a', str(NUM_OF_ACCOUNTS),
-		'--network-id', '1337',
-		'--wallet.accountKeysPath', GANACHE_KEYS_PATH,
+		'--network-id', str(GANACHE_NET_ID),
+		'--chain.hardfork', 'shanghai',
+		'--wallet.accountKeysPath', str(GANACHE_KEYS_PATH),
 	]
 	proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
 
@@ -71,6 +76,12 @@ def RunTests() -> List[Tuple[int, int]]:
 		time.sleep(1)
 	print('Connected to ganache')
 
+	# checksum keys
+	GanacheAccounts.ChecksumGanacheKeysFile(
+		CHECKSUM_KEYS_PATH,
+		GANACHE_KEYS_PATH
+	)
+
 	# setup account
 	privKey = SelectRandomAccount(w3)
 
diff --git a/tests/GasCostEvalPlot.py b/tests/GasCostEvalPlot.py
index 2b29e4d..1f9bf79 100644
--- a/tests/GasCostEvalPlot.py
+++ b/tests/GasCostEvalPlot.py
@@ -21,75 +21,12 @@
 BUILD_DIR_PATH      = os.path.join(BASE_DIR_PATH, 'build')
 
 
-# def DrawGraph(
-# 	dest: os.PathLike,
-# 	data: List[Tuple[int, int]],
-# 	scaleBy: int,
-# 	title: str,
-# 	xlabel: str = 'Number of subscribers',
-# 	ylabel: str = 'Gas cost',
-# ) -> None:
-
-# 	scale = np.power(10, scaleBy)
-# 	plt.plot(
-# 		np.arange(1, len(data) + 1),
-# 		np.array([ cost for _, cost in data ]) / scale,
-# 	)
-# 	plt.xticks(np.arange(1, len(data) + 1))
-# 	plt.title(title)
-# 	plt.xlabel(xlabel)
-# 	plt.ylabel(ylabel + f' (1e{scaleBy})')
-# 	plt.savefig(dest + '.svg', format='svg')
-# 	plt.savefig(dest + '.pdf', format='pdf')
-
-# 	# clear plot
-# 	plt.clf()
-
-
-# def DrawGraph(
-# 	dest: os.PathLike,
-# 	data: List[Tuple[int, int]],
-# 	scaleBy: int,
-# 	title: str,
-# 	xlabel: str = 'Number of subscribers',
-# 	ylabel: str = 'Gas cost',
-# ) -> None:
-
-# 	scale = np.power(10, scaleBy)
-# 	axes = plt.subplot()
-# 	axes.plot(
-# 		np.arange(1, len(data) + 1),
-# 		np.array([ cost for _, cost in data ]) / scale,
-# 	)
-
-# 	# set y-axis limits
-# 	dataAvg = sum([ cost for _, cost in data ])
-# 	dataAvg = dataAvg / len(data)
-# 	ymax = (dataAvg + (dataAvg * 0.0001)) / scale
-# 	ymin = (dataAvg - (dataAvg * 0.0001)) / scale
-# 	axes.set_ylim([ymin, ymax])
-
-# 	# avoid scientific notation
-# 	current_values = axes.get_yticks()
-# 	axes.set_yticklabels(
-# 		['{:.04f}'.format(x) for x in current_values]
-# 	)
-
-# 	plt.xticks(np.arange(1, len(data) + 1))
-# 	plt.title(title)
-# 	plt.xlabel(xlabel)
-# 	plt.ylabel(ylabel + f' (1e{scaleBy})')
-# 	plt.savefig(dest + '.svg', format='svg')
-# 	plt.savefig(dest + '.pdf', format='pdf')
-
-# 	# clear plot
-# 	plt.clf()
-
 ErrorBarData = List[int]
 SingleData   = int
 DataPoint    = Tuple[int, Union[SingleData, ErrorBarData]]
 DataPoints   = List[DataPoint]
 
+
 # available markers: https://plotly.com/python/marker-style/
 # circle, square, diamond, cross, x, triangle, pentagon, hexagram, star, diamond, hourglass, bowtie, asterisk, hash, y
 # available colors: https://plotly.com/python/discrete-color/
@@ -181,6 +118,7 @@ def SaveFigure(
 	outName: str,
 ) -> None:
 	fig.write_image(outName + '.svg')
+	# fig.write_image(outName + '.png')
 
 	fig.write_image(outName + '.pdf')
 	# mitigation for issue https://github.com/plotly/plotly.py/issues/3469
@@ -244,6 +182,7 @@ def ReadResults(
 
 
 def main() -> None:
+	#===== Publish Gas Cost =====#
 	pubGasCostRes = ReadResults(
 		os.path.join(BUILD_DIR_PATH, 'publish_gas_cost.json')
 	)
@@ -257,6 +196,7 @@ def main() -> None:
 		outName=os.path.join(BUILD_DIR_PATH, 'publish_gas_cost'),
 	)
 
+	#===== Subscribe Gas Cost =====#
 	subGasCostRes = ReadResults(
 		os.path.join(BUILD_DIR_PATH, 'subscribe_gas_cost.json')
 	)
@@ -279,10 +219,34 @@ def main() -> None:
 		outName=os.path.join(BUILD_DIR_PATH, 'subscribe_gas_cost'),
 	)
 
+	#===== Register Gas Cost =====#
+	regGasCostRes = ReadResults(
+		os.path.join(BUILD_DIR_PATH, 'register_gas_cost.json')
+	)
+
+	fig3 = GenerateFigure(
+		inData=[ regGasCostRes ],
+		dataNames=[ 'Register Costs' ],
+		title='Register Gas Cost',
+		xLabel='Number of Publishers',
+		yLabel='Amount of Gas Units',
+	)
+	fig3YMax = max([ y[2] for _, y in regGasCostRes ])
+	fig3YMin = min([ y[0] for _, y in regGasCostRes ])
+	fig3YMid = (fig3YMax + fig3YMin) / 2
+	fig3YMax += fig3YMid * 0.00005
+	fig3YMin -= fig3YMid * 0.00005
+	fig3.update_yaxes(range=[fig3YMin, fig3YMax])
+	SaveFigure(
+		fig=fig3,
+		outName=os.path.join(BUILD_DIR_PATH, 'register_gas_cost'),
+	)
+
+	#===== Summary Graph =====#
 	PlotGraph(
-		inData=[ pubGasCostRes, subGasCostRes, ],
-		dataNames=[ 'Publish Costs', 'Subscribe Costs', ],
-		title='Publish & Subscribe Gas Cost',
+		inData=[ pubGasCostRes, subGasCostRes, regGasCostRes, ],
+		dataNames=[ 'Publish Costs', 'Subscribe Costs', 'Register Costs', ],
+		title='Pub-Sub Service Gas Costs',
 		xLabel='Number of Subscribers/Publishers',
 		yLabel='Amount of Gas Units',
 		outName=os.path.join(BUILD_DIR_PATH, 'gas_cost'),
diff --git a/tests/Makefile b/tests/Makefile
index 1fc8a5c..315f3ec 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -3,61 +3,61 @@ CONTRACTS   := \
 	HelloWorldPublisher \
 	HelloWorldSubscriber
 
+MKFILE_PATH  := $(abspath $(lastword $(MAKEFILE_LIST)))
+CURRENT_DIR  := $(dir $(MKFILE_PATH))
+ROOT_DIR     := $(CURRENT_DIR)/..
+BUILD_DIR    := $(ROOT_DIR)/build
+
+SOLC_BIN     := $(BUILD_DIR)/solc-static-linux
+OPTIMIZE_RUN := 200
+SOLC_FLAGS   := --optimize --optimize-runs $(OPTIMIZE_RUN) \
+				--revert-strings strip \
+				--via-ir \
+				--overwrite \
+				--base-path $(ROOT_DIR) \
+				--output-dir $(BUILD_DIR)/$(MODULE_NAME)/all/
+
 CHECKSUM_BIN := openssl sha256
 
 
-all:    $(addprefix ../build/$(MODULE_NAME)/,$(addsuffix .abi,$(CONTRACTS))) \
-		$(addprefix ../build/$(MODULE_NAME)/,$(addsuffix .bin,$(CONTRACTS))) \
-		$(addprefix ../build/$(MODULE_NAME)/,checksums.txt)
+all: $(CONTRACTS) checksums
 
 
-../build/nodeenv.state:
-	$(MAKE) -C .. build/nodeenv.state
+$(SOLC_BIN):
+	$(MAKE) -C .. solc_bin
 
 
-../build/$(MODULE_NAME)/%.bin: %.sol ../build/nodeenv.state
+$(BUILD_DIR)/$(MODULE_NAME)/%.bin: %.sol $(SOLC_BIN)
 	( \
-		. ../build/nodeenv/bin/activate && \
-		solcjs  --optimize --optimize-runs 200 \
-				--bin \
-				--include-path node_modules/ --base-path .. \
-				--output-dir ../build/$(MODULE_NAME)/ \
-				$< && \
-		mv  ../build/$(MODULE_NAME)/$(MODULE_NAME)_$(basename $<)_sol_$(basename $<).bin \
-			../build/$(MODULE_NAME)/$(basename $<).bin && \
-		rm  -f ../build/$(MODULE_NAME)/*_sol_*.bin \
+		$(SOLC_BIN) --bin $(SOLC_FLAGS) $< && \
+		cp  $(BUILD_DIR)/$(MODULE_NAME)/all/$(basename $<).bin \
+			$(BUILD_DIR)/$(MODULE_NAME)/$(basename $<).bin \
 	)
 
 
-../build/$(MODULE_NAME)/%.abi: %.sol ../build/nodeenv.state
+$(BUILD_DIR)/$(MODULE_NAME)/%.abi: %.sol $(SOLC_BIN)
 	( \
-		. ../build/nodeenv/bin/activate && \
-		solcjs  --optimize --optimize-runs 200 \
-				--abi \
-				--include-path node_modules/ --base-path .. \
-				--output-dir ../build/$(MODULE_NAME)/ \
-				$< && \
-		mv  ../build/$(MODULE_NAME)/$(MODULE_NAME)_$(basename $<)_sol_$(basename $<).abi \
-			../build/$(MODULE_NAME)/$(basename $<).abi && \
-		rm  -f ../build/$(MODULE_NAME)/*_sol_*.abi \
+		$(SOLC_BIN) --abi $(SOLC_FLAGS) $< && \
+		cp  $(BUILD_DIR)/$(MODULE_NAME)/all/$(basename $<).abi \
+			$(BUILD_DIR)/$(MODULE_NAME)/$(basename $<).abi \
 	)
 
 
-../build/$(MODULE_NAME)/checksums.txt:  $(addprefix ../build/$(MODULE_NAME)/,$(addsuffix .abi,$(CONTRACTS))) \
-										$(addprefix ../build/$(MODULE_NAME)/,$(addsuffix .bin,$(CONTRACTS)))
+$(CONTRACTS): %: $(BUILD_DIR)/$(MODULE_NAME)/%.abi $(BUILD_DIR)/$(MODULE_NAME)/%.bin
+
+
+$(BUILD_DIR)/$(MODULE_NAME)/checksums.txt: $(CONTRACTS)
 	( \
-		cd ../build/$(MODULE_NAME); \
+		cd $(BUILD_DIR)/$(MODULE_NAME); \
 		$(CHECKSUM_BIN) $(addsuffix .abi,$(CONTRACTS)) $(addsuffix .bin,$(CONTRACTS)) > checksums.txt; \
 	)
 
 
-checksums: ../build/$(MODULE_NAME)/checksums.txt
+checksums: $(BUILD_DIR)/$(MODULE_NAME)/checksums.txt
 
 
 clean:
-	rm -f   $(addprefix ../build/$(MODULE_NAME)/,$(addsuffix .abi,$(CONTRACTS))) \
-			$(addprefix ../build/$(MODULE_NAME)/,$(addsuffix .bin,$(CONTRACTS))) \
-			$(addprefix ../build/$(MODULE_NAME)/,checksums.txt)
+	rm -rf $(BUILD_DIR)/$(MODULE_NAME)/
 
 
-.PHONY: all clean checksums
+.PHONY: all clean checksums $(CONTRACTS)
diff --git a/utils/EthContractHelper.py b/utils/EthContractHelper.py
deleted file mode 100644
index 4d50fa3..0000000
--- a/utils/EthContractHelper.py
+++ /dev/null
@@ -1,586 +0,0 @@
-#!/usr/bin/env python3
-# -*- coding:utf-8 -*-
-###
-# Copyright (c) 2023 Haofan Zheng
-# Use of this source code is governed by an MIT-style
-# license that can be found in the LICENSE file or at
-# https://opensource.org/licenses/MIT.
-###
-
-
-import argparse
-import json
-import logging
-import os
-import urllib.request
-import web3
-
-from eth_account.datastructures import SignedTransaction
-from typing import Any, Dict, List, Tuple, Union
-from web3 import Web3 # python3 -m pip install web3
-from web3.contract.contract import Contract, ContractConstructor, ContractFunction
-from web3.types import TxReceipt
-
-# check web3 version
-if list(map(int, web3.__version__.split('.'))) < [ 6, 2, 0 ]:
-	raise RuntimeError(
-		'web3 version {} is not supported; '
-		'please upgrade to version 6.2.0 or above.'.format(web3.__version__)
-	)
-
-
-def LoadBytesFromRelease(
-	projConf: dict,
-	release: str,
-	contract: str
-) -> Tuple[str, str]:
-
-	urlAbi = projConf['releaseUrl'].format(version=release, contract=contract + '.abi')
-	with urllib.request.urlopen(urlAbi) as f:
-		abiBytes = f.read().decode()
-
-	urlBin = projConf['releaseUrl'].format(version=release, contract=contract + '.bin')
-	with urllib.request.urlopen(urlBin) as f:
-		binBytes = f.read().decode()
-
-	return abiBytes, binBytes
-
-
-def LoadBytesFromLocal(projConf: dict, contract: str) -> Tuple[str, str]:
-
-	module = projConf['contractModuleMap'][contract]
-
-	pathAbi = os.path.join(projConf['buildDir'], module, contract + '.abi')
-	if os.path.isfile(pathAbi) is False:
-		raise FileNotFoundError(
-			'Cannot find locally built contract ABI file at {}; '
-			'please build the contract first.'.format(pathAbi)
-		)
-
-	with open(pathAbi, 'r') as f:
-		abiBytes = f.read()
-
-	pathBin = os.path.join(projConf['buildDir'], module, contract + '.bin')
-	if os.path.isfile(pathBin) is False:
-		raise FileNotFoundError(
-			'Cannot find locally built contract BIN file at {}; '
-			'please build the contract first.'.format(pathBin)
-		)
-
-	with open(pathBin, 'r') as f:
-		binBytes = f.read()
-
-	return abiBytes, binBytes
-
-
-def LoadContract(
-	w3: Web3,
-	projConf: Union[ dict, os.PathLike ],
-	contractName: str,
-	release: Union[ None, str ] = None,
-	address: Union[ None, str ] = None,
-) -> Contract:
-
-	if not isinstance(projConf, dict):
-		with open(projConf, 'r') as f:
-			projConf = json.load(f)
-
-	if release is None:
-		# load from local build
-		abiBytes, binBytes = LoadBytesFromLocal(projConf, contractName)
-	else:
-		# load from release
-		abiBytes, binBytes = LoadBytesFromRelease(projConf, release, contractName)
-
-	if address is None:
-		# deploy new contract
-		contract = w3.eth.contract(abi=abiBytes, bytecode=binBytes)
-	else:
-		# load existing contract
-		contract = w3.eth.contract(address=address, abi=abiBytes)
-
-	return contract
-
-
-def _EstimateGas(
-	executable: Union[ ContractConstructor, ContractFunction ],
-	value: int,
-) -> int:
-	logger = logging.getLogger(__name__ + '.' + _EstimateGas.__name__)
-
-	gas = executable.estimate_gas({
-		'value': value,
-	})
-	logger.info('Estimated gas: {}'.format(gas))
-	# add a little bit flexibility
-	gas = int(gas * 1.1)
-
-	return gas
-
-
-def _DetermineGas(
-	executable: Union[ ContractConstructor, ContractFunction ],
-	gas: Union[ None, int ],
-	value: int,
-) -> int:
-	logger = logging.getLogger(__name__ + '.' + _DetermineGas.__name__)
-
-	if gas is None:
-		gas = _EstimateGas(executable, value)
-
-	logger.debug('Gas: {}; Value: {}'.format(gas, value))
-
-	return gas
-
-
-def _DetermineMaxPriorFee(
-	w3: Web3,
-) -> int:
-	baseGasFee = w3.eth.gas_price
-	# priority fee is 2% of base fee
-	maxPriorFee = int(baseGasFee * 2) // 100
-	# ensure it's higher than w3.eth.max_priority_fee
-	maxPriorFee = max(maxPriorFee, int(w3.eth.max_priority_fee))
-
-	return maxPriorFee
-
-
-def _FillMessage(
-	w3: Web3,
-	gas: int,
-	value: int,
-	privKey: Union[ None, str ],
-) -> dict:
-
-	msg = {
-		'nonce': w3.eth.get_transaction_count(w3.eth.default_account),
-		'chainId': w3.eth.chain_id,
-		'gas': gas,
-		'value': value,
-	}
-	if privKey is not None:
-		msg['maxFeePerGas'] = int(w3.eth.gas_price * 2)
-		msg['maxPriorityFeePerGas'] = _DetermineMaxPriorFee(w3)
-
-	return msg
-
-
-def _SignTx(
-	w3: Web3,
-	tx: dict,
-	privKey: str,
-	confirmPrompt: bool
-) -> SignedTransaction:
-	logger = logging.getLogger(__name__ + '.' + _SignTx.__name__)
-
-	maxBaseFee = tx['maxFeePerGas']
-	maxPriorityFee = tx['maxPriorityFeePerGas']
-	gas = tx['gas']
-	value = tx['value']
-
-	balance = w3.eth.get_balance(w3.eth.default_account)
-
-	maxFee = (maxBaseFee + maxPriorityFee) * gas
-	maxCost = maxFee + value
-	if maxCost > balance:
-		raise RuntimeError(
-			'Insufficient balance to pay for the transaction'
-			'(balance {} wei; max cost: {} wei)'.format(
-				balance, maxCost
-			)
-		)
-
-	if confirmPrompt:
-		baseFee = w3.eth.gas_price
-		baseFeeGwei = w3.from_wei(baseFee, 'gwei')
-		fee = baseFee * gas
-		feeGwei = w3.from_wei(fee, 'gwei')
-
-		maxBaseFeeGwei = w3.from_wei(maxBaseFee, 'gwei')
-		maxPriorityFeeGwei = w3.from_wei(maxPriorityFee, 'gwei')
-		maxFeeGwei = w3.from_wei(maxFee, 'gwei')
-
-		valueEther = w3.from_wei(value, 'ether')
-
-		cost = fee + value
-		costEther = w3.from_wei(cost, 'ether')
-		maxCostEther = w3.from_wei(maxCost, 'ether')
-
-		balanceEther = w3.from_wei(balance, 'ether')
-		afterBalanceEther = w3.from_wei(balance - cost, 'ether')
-		minAfterBalanceEther = w3.from_wei(balance - maxCost, 'ether')
-
-		print('Gas:                  {}'.format(gas))
-		print('gas price:            {:.9f} Gwei'.format(baseFeeGwei))
-		print('Fee:                  {:.9f} Gwei'.format(feeGwei))
-		print('Max fee / gas:        {:.9f} Gwei'.format(maxBaseFeeGwei))
-		print('Max prior. fee / gas: {:.9f} Gwei'.format(maxPriorityFeeGwei))
-		print('Max fee:              {:.9f} Gwei'.format(maxFeeGwei))
-		print('Value:                {:.18f} Ether'.format(valueEther))
-		print()
-		print('Cost:                 {:.18f} Ether'.format(costEther))
-		print('Max cost:             {:.18f} Ether'.format(maxCostEther))
-		print()
-		print('Balance:              {:.18f} Ether'.format(balanceEther))
-		print('After balance:        {:.18f} Ether'.format(afterBalanceEther))
-		print('Min. after balance:   {:.18f} Ether'.format(minAfterBalanceEther))
-
-		confirm = input('Confirm transaction? (please type "yes", case insensitive): ')
-		if confirm.lower() != 'yes':
-			raise RuntimeError('Transaction cancelled')
-
-	logger.info(
-		'Signing transaction with max cost of {} wei'.format(maxCost)
-	)
-	signedTx = w3.eth.account.sign_transaction(tx, privKey)
-
-	return signedTx
-
-
-def _DoTransaction(
-	w3: Web3,
-	executable: Union[ ContractConstructor, ContractFunction ],
-	privKey: Union[ None, str ],
-	gas: Union[ None, int ],
-	value: int,
-	confirmPrompt: bool,
-) -> TxReceipt:
-	logger = logging.getLogger(__name__ + '.' + _DoTransaction.__name__)
-
-	gas = _DetermineGas(executable, gas, value)
-	msg = _FillMessage(w3, gas, value, privKey)
-
-	if privKey is None:
-		# no signing needed
-		txHash = executable.transact(msg)
-	else:
-		# need to sign
-		tx = executable.build_transaction(msg)
-		signedTx = _SignTx(w3, tx, privKey, confirmPrompt)
-		txHash = w3.eth.send_raw_transaction(signedTx.rawTransaction)
-
-	receipt = w3.eth.wait_for_transaction_receipt(txHash)
-
-	receiptJson = json.dumps(json.loads(Web3.to_json(receipt)), indent=4)
-	logger.info('Transaction receipt: {}'.format(receiptJson))
-
-	logger.info('Balance after transaction: {} Ether'.format(
-		w3.from_wei(
-			w3.eth.get_balance(w3.eth.default_account),
-			'ether'
-		)
-	))
-
-	return receipt
-
-
-def _FindConstructorAbi(
-	abiList: List[ dict ],
-) -> dict:
-	for abi in abiList:
-		if abi['type'] == 'constructor':
-			return abi
-
-	raise ValueError('No constructor found in ABI')
-
-
-def DeployContract(
-	w3: Web3,
-	contract: Contract,
-	arguments: list,
-	privKey: Union[str, None] = None,
-	gas: Union[int, None] = None,
-	value: int = 0,
-	confirmPrompt: bool = True,
-) -> TxReceipt:
-	logger = logging.getLogger(__name__ + '.' + DeployContract.__name__)
-
-	constrAbi = _FindConstructorAbi(contract.abi)
-	isPayable = constrAbi['stateMutability'] == 'payable'
-	executable = contract.constructor(*arguments)
-
-	receipt = _DoTransaction(
-		w3=w3,
-		executable=executable,
-		privKey=privKey,
-		gas=gas,
-		value=value if isPayable else 0,
-		confirmPrompt=confirmPrompt,
-	)
-	logger.info('Contract deployed at {}'.format(receipt.contractAddress))
-
-	return receipt
-
-
-def _FindFuncAbi(
-	abiList: List[ dict ],
-	funcName: str,
-) -> dict:
-	for abi in abiList:
-		if (
-			(abi['type'] == 'function') and
-			(abi['name'] == funcName)
-		):
-			return abi
-
-	raise ValueError('Function "{}" not found in ABI'.format(funcName))
-
-
-def CallContractFunc(
-	w3: Web3,
-	contract: Contract,
-	funcName: str,
-	arguments: list,
-	privKey: Union[str, None] = None,
-	gas: Union[int, None] = None,
-	value: int = 0,
-	confirmPrompt: bool = True,
-) -> Union[TxReceipt, Any]:
-	logger = logging.getLogger(__name__ + '.' + CallContractFunc.__name__)
-
-	funcAbi = _FindFuncAbi(contract.abi, funcName)
-	isViewFunc = funcAbi['stateMutability'] == 'view'
-	isPayable = funcAbi['stateMutability'] == 'payable'
-	executable = contract.functions[funcName](*arguments)
-
-	if isViewFunc:
-		logger.info('Calling view function "{}"'.format(funcName))
-		result = executable.call()
-		logger.info('Type:{}; Result: {}'.format(type(result), result))
-
-		return result
-	else:
-		receipt = _DoTransaction(
-			w3=w3,
-			executable=executable,
-			privKey=privKey,
-			gas=gas,
-			value=value if isPayable else 0,
-			confirmPrompt=confirmPrompt,
-		)
-
-		return receipt
-
-
-def ConvertValToWei(val: int, unit: str) -> int:
-	logger = logging.getLogger(__name__ + '.' + ConvertValToWei.__name__)
-
-	valueToSend = Web3.to_wei(val, unit)
-	valueToSendEth = Web3.from_wei(valueToSend, 'ether')
-	if valueToSend > 0:
-		logger.warning(
-			'Value to be sent: {:.18f} ether (or {} wei)'.format(
-				valueToSendEth,
-				valueToSend
-			)
-		)
-
-	return int(valueToSend)
-
-
-def _LoadAccountCredentials(
-	keyJson: os.PathLike,
-	index: int
-) -> Tuple[str, str]:
-	with open(keyJson, 'r') as f:
-		keyJson: Dict[str, Dict[str, str]] = json.load(f)
-
-	if index >= len(keyJson['addresses']):
-		raise IndexError('Cannot find address at index {}'.format(index))
-
-	address = [
-		a for i, a in enumerate(keyJson['addresses'].keys()) if i == index
-	][0]
-
-	for addr, priv in keyJson['private_keys'].items():
-		if addr.lower() == address.lower():
-			return address, priv
-
-	raise KeyError('Cannot find private key for address {}'.format(address))
-
-
-def SetupSendingAccount(
-	w3: Web3,
-	account: int,
-	keyJson: Union[ None, os.PathLike ] = None,
-) -> Union[ str, None ]:
-	logger = logging.getLogger(__name__ + '.' + SetupSendingAccount.__name__)
-
-	if keyJson is not None:
-		addr, privKey = _LoadAccountCredentials(keyJson, account)
-		w3.eth.default_account = addr
-	else:
-		w3.eth.default_account = w3.eth.accounts[0]
-		privKey = None
-
-	if privKey is not None:
-		# ensure that the private key matches the address
-		privAcc = w3.eth.account.from_key(privKey)
-		if privAcc.address != w3.eth.default_account:
-			raise ValueError(
-				'The private key does not match the address'
-			)
-
-	logger.info(
-		'The address of the account to be used: {}'.format(
-			w3.eth.default_account
-		)
-	)
-
-	return privKey
-
-
-def ChecksumGanacheKeysFile(dest: os.PathLike, src: os.PathLike):
-	with open(src, 'r') as f:
-		keysJson: Dict[str, Dict[str, str]] = json.load(f)
-
-	addrs = keysJson['addresses']
-	addrs = {
-		Web3.to_checksum_address(k): Web3.to_checksum_address(v)
-			for k, v in addrs.items()
-	}
-	keysJson['addresses'] = addrs
-
-	privKeys = keysJson['private_keys']
-	privKeys = {
-		Web3.to_checksum_address(k): v for k, v in privKeys.items()
-	}
-	keysJson['private_keys'] = privKeys
-
-	with open(dest, 'w') as f:
-		json.dump(keysJson, f, indent='\t')
-
-
-def main():
-	argParser = argparse.ArgumentParser(
-		description='Deploy contracts to Ethereum blockchain'
-	)
-	argParser.add_argument(
-		'--config', '-c', type=str, default='project_conf.json', required=False,
-		help='Path to the project configuration file'
-	)
-	argParser.add_argument(
-		'--verbose', action='store_true',
-		help='Verbose logging'
-	)
-	argParser.add_argument(
-		'--http', type=str, default='http://localhost:7545', required=False,
-		help='HTTP provider URL'
-	)
-	argParser.add_argument(
-		'--key-json', type=str, default=None, required=False,
-		help='Path to keys.json'
-	)
-	argParser.add_argument(
-		'--account', type=int, default=0, required=False,
-		help='Index of the account to use'
-	)
-	argParser.add_argument(
-		'--release', type=str, default=None, required=False,
-		help='Use prebuilt version from GitHub Release of given git version tag'
-			'(if not set, local built version will be used)'
-	)
-	argParser.add_argument(
-		'--contract', type=str, required=True,
-		help='Contract name'
-	)
-	argParser.add_argument(
-		'--gas', type=int, default=None, required=False,
-		help='Gas limit'
-	)
-	argParser.add_argument(
-		'--value', type=int, default=0, required=False,
-		help='Value to be sent along with the transaction'
-	)
-	argParser.add_argument(
-		'--value-unit', type=str, default='wei', required=False,
-		choices=['ether', 'gwei', 'wei'],
-		help='Unit of value (ether, gwei, wei)'
-	)
-	argParser.add_argument(
-		'--no-confirm', action='store_true',
-		help='Do not ask for confirmation'
-	)
-
-	# two operations: deploy and call
-	argParserSubOp = argParser.add_subparsers(
-		help='Operation to be performed',
-		dest='operation',
-		required=True
-	)
-
-	argParserSubOpDeploy = argParserSubOp.add_parser('deploy')
-	argParserSubOpDeploy.add_argument(
-		'--args', type=str, nargs='*', default=[], required=False,
-		help='Constructor/function arguments'
-	)
-
-	argParserSubOpCall = argParserSubOp.add_parser('call')
-	argParserSubOpCall.add_argument(
-		'--address', type=str, default=None, required=True,
-		help='Address of the contract to be called'
-	)
-	argParserSubOpCall.add_argument(
-		'--function', type=str, required=True,
-		help='Call function'
-	)
-	argParserSubOpCall.add_argument(
-		'--args', type=str, nargs='*', default=[], required=False,
-		help='Constructor/function arguments'
-	)
-
-	args = argParser.parse_args()
-
-	address = None if args.operation != 'call' else args.address
-
-	# logging configuration
-	loggingFormat = '%(asctime)s %(levelname)s %(message)s'
-	if args.verbose:
-		logging.basicConfig(level=logging.DEBUG, format=loggingFormat)
-	else:
-		logging.basicConfig(level=logging.INFO, format=loggingFormat)
-	logger = logging.getLogger(__name__ + main.__name__)
-
-	# connect to Ethereum node
-	w3 = Web3(Web3.HTTPProvider(args.http))
-	if not w3.is_connected():
-		raise RuntimeError(
-			'Failed to connect to Ethereum node at %s' % args.http
-		)
-
-	valueToSend = ConvertValToWei(args.value, args.value_unit)
-	privKey = SetupSendingAccount(w3, args.account, args.key_json)
-	contract = LoadContract(
-		w3=w3,
-		projConf=args.config,
-		contractName=args.contract,
-		release=args.release,
-		address=address
-	)
-
-	# deploy or call contract
-	if args.operation == 'deploy':
-		DeployContract(
-			w3=w3,
-			contract=contract,
-			arguments=args.args,
-			privKey=privKey,
-			gas=args.gas,
-			value=valueToSend,
-			confirmPrompt=(not args.no_confirm)
-		)
-	elif args.operation == 'call':
-		CallContractFunc(
-			w3=w3,
-			contract=contract,
-			funcName=args.function,
-			arguments=args.args,
-			privKey=privKey,
-			gas=args.gas,
-			value=valueToSend,
-			confirmPrompt=(not args.no_confirm)
-		)
-
-
-if __name__ == '__main__':
-	main()
diff --git a/utils/PyEthHelper b/utils/PyEthHelper
new file mode 160000
index 0000000..0e59df2
--- /dev/null
+++ b/utils/PyEthHelper
@@ -0,0 +1 @@
+Subproject commit 0e59df2450533aaf4669892ff4c152d0e152e0ac
diff --git a/utils/ganache_keys.json b/utils/ganache_keys.json
deleted file mode 100644
index 6adb0a8..0000000
--- a/utils/ganache_keys.json
+++ /dev/null
@@ -1 +0,0 @@
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509202da91d35e9a6d9":"0xf8b78156e0d23fb3570adb1a32538643d7d97387a7695f01ac34f0e890e4f608","0x17332dd7f9bd584e2e83f4cffdca0a448b3b903a":"0xe0344f7ec829bdf9b7f10e0c5d900fdbad3e2c70720d973c81561414badfaad6","0x9d7822d5bb9f7b9b655669550095d2f14afac469":"0x74a387a4e8bb33866895610af34e754a7bdf081147a22ce938116cc276ba502f","0x4c0408db276ef793333baf5b226d8b180c3d0a89":"0x136eba5520852a6ae33f5cef106df79213fe162ff6b58cf1afa2100a60ea0f67"}}
\ No newline at end of file
diff --git a/utils/ganache_keys_checksum.json b/utils/ganache_keys_checksum.json
deleted file mode 100644
index 2662d9e..0000000
--- a/utils/ganache_keys_checksum.json
+++ /dev/null
@@ -1,206 +0,0 @@
-{
-	"addresses": {
-		"0x90F8bf6A479f320ead074411a4B0e7944Ea8c9C1": "0x90F8bf6A479f320ead074411a4B0e7944Ea8c9C1",
-		"0xFFcf8FDEE72ac11b5c542428B35EEF5769C409f0": "0xFFcf8FDEE72ac11b5c542428B35EEF5769C409f0",
-		"0x22d491Bde2303f2f43325b2108D26f1eAbA1e32b": "0x22d491Bde2303f2f43325b2108D26f1eAbA1e32b",
-		"0xE11BA2b4D45Eaed5996Cd0823791E0C93114882d": "0xE11BA2b4D45Eaed5996Cd0823791E0C93114882d",
-		"0xd03ea8624C8C5987235048901fB614fDcA89b117": "0xd03ea8624C8C5987235048901fB614fDcA89b117",
-		"0x95cED938F7991cd0dFcb48F0a06a40FA1aF46EBC": "0x95cED938F7991cd0dFcb48F0a06a40FA1aF46EBC",
-		"0x3E5e9111Ae8eB78Fe1CC3bb8915d5D461F3Ef9A9": "0x3E5e9111Ae8eB78Fe1CC3bb8915d5D461F3Ef9A9",
-		"0x28a8746e75304c0780E011BEd21C72cD78cd535E": "0x28a8746e75304c0780E011BEd21C72cD78cd535E",
-		"0xACa94ef8bD5ffEE41947b4585a84BdA5a3d3DA6E": "0xACa94ef8bD5ffEE41947b4585a84BdA5a3d3DA6E",
-		"0x1dF62f291b2E969fB0849d99D9Ce41e2F137006e": "0x1dF62f291b2E969fB0849d99D9Ce41e2F137006e",
-		"0x610Bb1573d1046FCb8A70Bbbd395754cD57C2b60": "0x610Bb1573d1046FCb8A70Bbbd395754cD57C2b60",
-		"0x855FA758c77D68a04990E992aA4dcdeF899F654A": "0x855FA758c77D68a04990E992aA4dcdeF899F654A",
-		"0xfA2435Eacf10Ca62ae6787ba2fB044f8733Ee843": "0xfA2435Eacf10Ca62ae6787ba2fB044f8733Ee843",
-		"0x64E078A8Aa15A41B85890265648e965De686bAE6": "0x64E078A8Aa15A41B85890265648e965De686bAE6",
-		"0x2F560290FEF1B3Ada194b6aA9c40aa71f8e95598": "0x2F560290FEF1B3Ada194b6aA9c40aa71f8e95598",
-		"0xf408f04F9b7691f7174FA2bb73ad6d45fD5d3CBe": "0xf408f04F9b7691f7174FA2bb73ad6d45fD5d3CBe",
-		"0x66FC63C2572bF3ADD0Fe5d44b97c2E614E35e9a3": "0x66FC63C2572bF3ADD0Fe5d44b97c2E614E35e9a3",
-		"0xF0D5BC18421fa04D0a2A2ef540ba5A9f04014BE3": "0xF0D5BC18421fa04D0a2A2ef540ba5A9f04014BE3",
-		"0x325A621DeA613BCFb5B1A69a7aCED0ea4AfBD73A": "0x325A621DeA613BCFb5B1A69a7aCED0ea4AfBD73A",
-		"0x3fD652C93dFA333979ad762Cf581Df89BaBa6795": "0x3fD652C93dFA333979ad762Cf581Df89BaBa6795",
-		"0x73EB6d82CFB20bA669e9c178b718d770C49BB52f": "0x73EB6d82CFB20bA669e9c178b718d770C49BB52f",
-		"0x9D8E5fAc117b15DaCED7C326Ae009dFE857621f1": "0x9D8E5fAc117b15DaCED7C326Ae009dFE857621f1",
-		"0x982a8CbE734cb8c29A6a7E02a3B0e4512148F6F9": "0x982a8CbE734cb8c29A6a7E02a3B0e4512148F6F9",
-		"0xCDC1E53Bdc74bBf5b5F715D6327Dca5785e228B4": "0xCDC1E53Bdc74bBf5b5F715D6327Dca5785e228B4",
-		"0xf5d1EAF516eF3b0582609622A221656872B82F78": "0xf5d1EAF516eF3b0582609622A221656872B82F78",
-		"0xf8eA26C3800D074a11bf814dB9a0735886C90197": "0xf8eA26C3800D074a11bf814dB9a0735886C90197",
-		"0x2647116f9304abb9F0B7aC29aBC0D9aD540506C8": "0x2647116f9304abb9F0B7aC29aBC0D9aD540506C8",
-		"0x80a32A0E5cA81b5a236168C21532B32e3cBC95e2": "0x80a32A0E5cA81b5a236168C21532B32e3cBC95e2",
-		"0x47f55A2ACe3b84B0F03717224DBB7D0Df4351658": "0x47f55A2ACe3b84B0F03717224DBB7D0Df4351658",
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-	},
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-	}
-}
\ No newline at end of file