Source code verification provides transparency for users interacting with smart contracts on Ethereum. By matching compiled code with blockchain deployments, Etherscan enables public auditing of smart contracts - giving users confidence in what they're digitally signing.
Why Contract Verification Matters
- Ensures deployed code matches published source code
- Allows community auditing of contract functionality
- Required for token information updates on Etherscan
- Builds trust in decentralized applications
Verification Methods
Contract owners have two verification options:
Cross-Chain Similar Match Verification
- Instant verification if contract exists on another Etherscan explorer
- Ideal for multi-chain deployments
Manual Verification
- Required when no cross-chain matches exist
- Process outlined below
👉 Learn more about multi-chain deployments
Step-by-Step Manual Verification
1. Access Verification Portal
Navigate to your contract address page and:
- Select the "Contract" tab
- Click "Verify And Publish"
2. Submit Contract Details
Provide all required information:
| Field | Description |
|---|---|
| Contract Name | Exact name used in deployment |
| Compiler Version | Matching version used for compilation |
| Contract Code | Flattened source code without imports |
Additional fields at page bottom:
- Optimization options
- Constructor arguments
- Linked libraries
3. Handle Verification Results
Successful Verification
- Suggest name tags and labels
- Access AI-powered security checks
- View verification summary
👉 Explore advanced verification features
Verification Errors
- Review compiler warnings
- Examine bytecode differences
- Debug log provided
Post-Verification
Once verified:
- Contract details populate on Etherscan
- Source code becomes publicly visible
- Token information can be updated
FAQ Section
Q: Is verification mandatory for all contracts?
A: Only required when updating token information or when public auditing is desired.
Q: Can I verify contracts deployed on other chains?
A: Yes, Etherscan supports multi-chain verification with a single API key.
Q: What if my verification fails?
A: Carefully review error details and ensure all submitted information exactly matches your deployment configuration.
Q: How long does verification take?
A: Cross-chain matches are instant, while manual verification typically completes within minutes.
Q: Are there costs for verification?
A: No, contract verification is completely free on Etherscan.
Q: Can I update verified contract information?
A: Yes, simply repeat the verification process with updated details.
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