Verify using Blockscout

Step-by-step guide for verifying smart contracts on the Filecoin network using the Blockscout explorer's web interface.

The following guide walks you through the process of contract verification using the Blockscout explorer.

Prerequisites

• A deployed smart contract on Filecoin mainnet or Calibration testnet

• Your contract source code, either as a flattened .sol file or the same source files and metadata used at compile time

• The deployed contract address

• The Solidity compiler version used for deployment

• The license, optimization settings, optimizer runs, EVM version, and viaIR setting used for deployment

• Constructor arguments, if the contract was deployed with any

Step-by-Step Verification Process

Step 1: Prepare Your Contract Source Code

1. Open Remix IDE if you are using Blockscout's single-file Solidity verification method:

1. Flatten your contract:

   • In the File Explorer sidebar, under contracts, right-click on your contract

   • Select Flatten from the menu

   • This creates a <contract-name>_flattened.sol file with all dependencies included

2. Verify contract details:

   • Ensure the license and Solidity version match your original contract

   • Click Save to save the flattened contract

3. Download the flattened contract:

   • Right-click on <contract-name>_flattened.sol

   • Select Download to save the file locally

4. Gather required information:

   • Contract deployment address

   • Contract license type (optional)

   • Solidity compiler version used for deployment

   • Optimization settings, including enabled/disabled and runs count

   • EVM version and viaIR setting, if your deployment used non-default values

   • ABI-encoded constructor arguments, if your contract constructor used arguments

Step 2: Submit for Verification

1. Access Blockscout verification page:

   • For Filecoin mainnet, navigate to Filecoin Blockscout Contract Verification. Mainnet uses chain ID 314.

   • For Calibration testnet, navigate to Calibration Blockscout Contract Verification. Calibration uses chain ID 314159.

2. Fill in contract information:

   • Enter your contract's deployment address

   • Select the appropriate license type (optional)

   • Choose verification method: Solidity (Single file)

   • Select the compiler version used for deployment

   • Paste the source code from your <contract-name>_flattened.sol file

   • Configure the Optimization enabled checkbox to match your deployment settings

   • Enter optimizer runs, constructor arguments, and any advanced compiler settings if the form prompts for them

1. Submit for verification:

   • Click Verify & Publish to submit your contract

Step 3: Verification Complete

Upon successful verification, Blockscout will display a success message and redirect you to your verified contract dashboard where you can view the source code and interact with your contract.