How to Deploy and Verify a Hedera Smart Contract with Foundry
Discover how to deploy and automatically verify your Hedera smart contract. Learn how to verify a pre-existing contract and check a contracts verification status.
What you will accomplish
Prerequisites
Before you begin, you should be familiar with the following:
Get started
Set up project
To follow along, start with the main
branch, which is the default branch of this repository. This gives you the initial state from which you can follow along with the steps as described in the tutorial.
forge
manages dependencies by using git submodules. Clone the following project and pass --recurse-submodules
to the git clone
command to automatically initialize and update the submodule in the repository.
git clone --recurse-submodules [email protected]:hedera-dev/foundry-deploy-and-verify-smart-contract.git
Install the submodule dependencies
In your terminal, enter the projects root directory
cd foundry-deploy-and-verify-smart-contract
Next, run the following command to install the dependencies
forge install
Obtain your ECDSA Hex Encoded Private Key
In order to deploy your smart contract you will need access to your ECDSA hex encoded private key. You can find your ECDSA hex encoded private key by logging into Hedera Portal.
If you need to create a Hedera account, follow the create a hedera portal profile faucet tutorial.
Keep your private key accessible as it will be needed in the following steps.
Choose your Testnet RPC_URL
Choose one of the options over at How to Connect to Hedera Networks Over RPC
Keep the Testnet RPC_URL accessible as it will be needed in the next step.
Deploy and Automatically Verify Your Contract on Hedera Testnet
In your terminal, replace the value of "HEX_Encoded_Private_Key"
with your ECDSA
account's private key and replace "RPC_URL"
with a Testnet URL in the command below:
forge create --rpc-url "RPC_URL" --private-key "HEX_Encoded_Private_Key" --verify --verifier sourcify --verifier-url https://server-verify.hashscan.io src/TodoList.sol:TodoList
You should see output similar to the following:
[⠒] Compiling...
[⠔] Compiling 22 files with 0.8.23
[⠘] Solc 0.8.23 finished in 3.43s
Compiler run successful!
Deployer: 0xdfAb7899aFaBd146732c84eD83250889C40d6A00
Deployed to: 0x3b096B1c56A48119CB4fe140F1D26196590aF46C
Transaction hash: 0x32f6a03b569a934d8d1e20bb29a20fe1008f0b3bf9ab41e1f26ed88bb28b3c05
Starting contract verification...
Waiting for sourcify to detect contract deployment...
Start verifying contract `0x3b096B1c56A48119CB4fe140F1D26196590aF46C` deployed on 296
Submitting verification for [TodoList] "0x3b096B1c56A48119CB4fe140F1D26196590aF46C".
Contract successfully verified
Open the Hashscan explorer in your browser by copying the Deployed to EVM address and replacing <Deployed_Contract_EVM_Address>
in the link below:
https://hashscan.io/testnet/contract/<Deployed_Contract_EVM_Address>
Example: https://hashscan.io/testnet/contract/0x3b096B1c56A48119CB4fe140F1D26196590aF46C
You should see a page with:
The title "Contract" (1)
An "EVM Address" field that matches the value of
Deployed To
in the output above. (2)A section titled "Contract Bytecode" with a green
verified
tag. (3)Two tabs titled "Source" and "Bytecode". (4)
Verify A Pre-Existing Contract on Testnet
You may have a pre-existing contract that has not been verified yet.
In order to verify a pre-existing smart contract you will need:
the contract EVM address with
0x
prefixthe contract name or path to the contract
the chain ID
In your terminal, replace <CONTRACT_ADDRESS>
with the contract EVM address you wish to verify.
forge verify-contract --chain-id 296 --verifier sourcify --verifier-url https://server-verify.hashscan.io <CONTRACT_ADDRESS> src/TodoList.sol:TodoList
You should see output similar to the following:
Start verifying contract `0xC08d3Cf01739C713BaD1cf65FD4127CB90550568` deployed on 296
Submitting verification for [TodoList] "0xC08d3Cf01739C713BaD1cf65FD4127CB90550568".
Contract successfully verified
Check Contract Verification Status
In your terminal, replace <CONTRACT_ADDRESS>
with the contract EVM address you wish to verify.
forge verify-check --chain-id 296 --verifier sourcify --verifier-url https://server-verify.hashscan.io <CONTRACT_ADDRESS>
You should see output similar to the following:
Checking verification status on 296
Contract successfully verified
Complete
Congratulations, on completing the tutorial on how to verify smart contracts on Hedera Testnet.
You have learned how to:
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