Smart contract verification is one of the most important features offered by PolygonScan. When a developer deploys a smart contract to the Polygon network, the contract exists on-chain as compiled bytecode. Verification involves submitting the original Solidity source code to PolygonScan, which then compiles it and confirms that it produces the same bytecode as the deployed contract.
For users interacting with DeFi protocols, NFT marketplaces, or any other smart contract application on Polygon, checking whether a contract is verified is an important safety step. A verified contract allows you to inspect exactly what the code does before you sign a transaction.
To verify a smart contract on PolygonScan, developers navigate to the contract address page and click Verify and Publish in the Contract tab. They then select the compiler version, license type, and optimization settings used during deployment, and paste in the Solidity source code.
Reading and Writing Smart Contracts
Once a contract is verified, PolygonScan enables direct interaction through two tabs: Read Contract and Write Contract. The Read Contract tab displays all public and external view functions. The Write Contract tab exposes all state-changing functions, which require connecting a wallet such as MetaMask.
The ABI and Contract Events
The Contract tab also provides the ABI (Application Binary Interface) of the verified contract. The ABI is a JSON description of all the contract functions, events, and data types. PolygonScan also displays a full Event Log for each contract, showing every event emitted since deployment.
