Issues Verifying Contract With Base Sepolia

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Introduction

Verifying smart contracts is a crucial step in the development process, ensuring that the code is correct and functions as intended. However, users have been experiencing issues verifying contracts with Base Sepolia using Blockscout via Foundry. In this article, we will delve into the problem, explore possible solutions, and provide a step-by-step guide to reproduce the issue.

Description of the Problem

When attempting to verify a smart contract with Base Sepolia using Blockscout via Foundry, users encounter the following error message:

Submitting verification for [src/Counter.sol:Counter] 0x17FED9d293Ed42FBF9336B34056CE81567BA7cd6.
Submitted contract for verification:
	Response: `OK`
	GUID: `17fed9d293ed42fbf9336b34056ce81567ba7cd667cf42c9`
	URL: https://sepolia.basescan.org/address/0x17fed9d293ed42fbf9336b34056ce81567ba7cd6
Contract verification status:
Response: `OK`
Details: `Fail - Unable to verify`

This issue is not limited to a specific smart contract or project, as a minimal project has been created to reproduce the problem.

Minimal Project

The minimal project can be found on GitHub at https://github.com/SF-Konstantin/foundry-verification-issue-demo/tree/main. This project includes a simple smart contract, Counter.sol, which can be used to reproduce the issue.

Related Issue

The issue has been reported on the Foundry GitHub page at https://github.com/foundry-rs/foundry/issues/10029#issuecomment-2711241686. Interestingly, the issue does not appear with other chains, such as gnosis-chiado.

Possible Causes

The issue may lie on the Blockscout side, as the problem does not appear with other chains. However, it is also possible that the issue is related to the RPC or the Foundry configuration.

Steps to Reproduce

To reproduce the issue, follow these steps:

  1. Checkout the minimal project from GitHub: git clone https://github.com/SF-Konstantin/foundry-verification-issue-demo.git
  2. Run forge build to compile the smart contract
  3. Run the following command to verify the contract:
forge script script/Counter.s.sol:CounterScript --rpc-url https://84532.rpc.thirdweb.com --private-key <your private key> --verify \
  --verifier blockscout \
  --verifier-url https://base-sepolia.blockscout.com/api/ --broadcast`

Backend and Frontend Versions

The backend version used is v7.0.2.+commit.f9cb03ee, and the frontend version is v1.38.1.

Operating System

The operating system used is macOS.

Conclusion

Verifying smart contracts with Base Sepolia using Blockscout via Foundry has been a challenging task for users. By reproducing the issue using a minimal project, we can identify the possible causes and work towards a solution. The issue may lie on the Blockscout side, but it is also possible that the issue is related to the RPC or the Foundry configuration. Further investigation is needed to resolve this issue and ensure smooth contract verification with Base Sepolia.

Troubleshooting Tips

  • Check the Blockscout API documentation to ensure that the correct API endpoint is being used.
  • Verify that the RPC URL is correct and that the RPC is functioning properly.
  • Check the Foundry configuration to ensure that it is set up correctly.
  • Try verifying the contract with a different chain, such as gnosis-chiado, to see if the issue persists.

Future Work

Q: What is the issue with verifying contracts with Base Sepolia using Blockscout via Foundry?

A: The issue is that users are encountering an error message when attempting to verify a smart contract with Base Sepolia using Blockscout via Foundry. The error message indicates that the contract verification status is "Fail - Unable to verify".

Q: What is the minimal project that can be used to reproduce the issue?

A: The minimal project can be found on GitHub at https://github.com/SF-Konstantin/foundry-verification-issue-demo/tree/main. This project includes a simple smart contract, Counter.sol, which can be used to reproduce the issue.

Q: Is the issue limited to a specific smart contract or project?

A: No, the issue is not limited to a specific smart contract or project. The minimal project is a simple example that can be used to reproduce the issue.

Q: Has the issue been reported on the Foundry GitHub page?

A: Yes, the issue has been reported on the Foundry GitHub page at https://github.com/foundry-rs/foundry/issues/10029#issuecomment-2711241686.

Q: Does the issue appear with other chains, such as gnosis-chiado?

A: No, the issue does not appear with other chains, such as gnosis-chiado.

Q: What are the possible causes of the issue?

A: The possible causes of the issue are:

  • The issue may lie on the Blockscout side.
  • The issue may be related to the RPC or the Foundry configuration.

Q: How can I reproduce the issue?

A: To reproduce the issue, follow these steps:

  1. Checkout the minimal project from GitHub: git clone https://github.com/SF-Konstantin/foundry-verification-issue-demo.git
  2. Run forge build to compile the smart contract
  3. Run the following command to verify the contract:
forge script script/Counter.s.sol:CounterScript --rpc-url https://84532.rpc.thirdweb.com --private-key <your private key> --verify \
  --verifier blockscout \
  --verifier-url https://base-sepolia.blockscout.com/api/ --broadcast`

Q: What are the backend and frontend versions used?

A: The backend version used is v7.0.2.+commit.f9cb03ee, and the frontend version is v1.38.1.

Q: What is the operating system used?

A: The operating system used is macOS.

Q: What are some troubleshooting tips to resolve the issue?

A: Some troubleshooting tips to resolve the issue are:

  • Check the Blockscout API documentation to ensure that the correct API endpoint is being used.
  • Verify that the RPC URL is correct and that the RPC is functioning properly.
  • Check the Foundry configuration to ensure that it is set up correctly.
  • Try verifying the contract with a different chain, such as gnosis-chiado, to see if the issue persists.

Q: What is the next step to resolve the issue?

A: The next step to resolve the issue is to further investigate the possible causes and work with the Blockscout and Foundry teams to resolve the issue.