Foundry

Learn how to verify smart contracts on the Filecoin network using Foundry with various verification services including Blockscout, Sourcify, and Filfox.

This guide shows you how to verify your smart contracts using Foundry on the Filecoin network.

Prerequisites

• A Foundry project set up for Filecoin development

• If you don't have a Foundry project, check out the FEVM Foundry Kit

• A deployed contract address

• Contract constructor arguments (if any)

Verification Methods

Blockscout Verification

Blockscout is a popular blockchain explorer that supports contract verification.

Verify on Calibration Testnet:

forge verify-contract \
  --verifier blockscout \
  --verifier-url 'https://filecoin-testnet.blockscout.com/api/' \
  --force \
  --skip-is-verified-check \
  0xYourContractAddress \
  src/MyContract.sol:MyContract

Verify on Filecoin Mainnet:

forge verify-contract \
  --verifier blockscout \
  --verifier-url 'https://filecoin.blockscout.com/api/' \
  --force \
  --skip-is-verified-check \
  0xYourContractAddress \
  src/MyContract.sol:MyContract

Sourcify Verification

Sourceify provides decentralized contract verification.

Verify on Filecoin Mainnet:

forge verify-contract 0xYourContractAddress \
  src/MyToken.sol:MyToken \
  --chain-id 314 \
  --verifier sourcify \
  --verifier-url https://sourcify.dev/server/ \
  --guess-constructor-args

Verify on Calibration Testnet:

forge verify-contract 0xYourContractAddress \
  src/MyToken.sol:MyToken \
  --chain-id 314159 \
  --verifier sourcify \
  --verifier-url https://sourcify.dev/server/ \
  --guess-constructor-args

For more information, see the Sourcify documentation.

Filfox Verification

Filfox is the native Filecoin explorer with dedicated verification support.

Installation:

npm install -g @fil-b/filfox-verifier

Usage:

filfox-verifier forge <address> <contract-path> --chain <chainId>

Examples:

# Verify on Filecoin Mainnet
filfox-verifier forge 0xYourContractAddress src/MyContract.sol:MyContract --chain 314

# Verify on Calibration Testnet
filfox-verifier forge 0xYourContractAddress src/MyContract.sol:MyContract --chain 314159

For detailed information, see the @fil-b/filfox-verifier documentation.

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