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Smart contracts are self-executing programs stored on the Polygon blockchain. Every time you interact with a smart contract — whether depositing into a DeFi vault, minting an NFT, or swapping tokens on a decentralized exchange — a new transaction is created and a unique transaction hash is generated to record it.

Smart contract transaction hashes on Polygon look identical to regular transfer hashes: they are 66-character hexadecimal strings starting with "0x." However, when you look up a smart contract transaction on the block explorer, you will see additional data including the input data (the encoded function call), internal transactions (sub-calls made by the contract), and event logs (emitted by the contract during execution).

"Transactions are any actions that can be performed on-chain — not just simple transfers — but can be a smart contract deployment or a mint of an NFT."

— Polygon Explorer Guide

• Smart contract calls show input data (encoded function name and parameters)
• Internal transactions reveal sub-calls between contracts
• Event logs contain the data emitted by the contract (e.g., Transfer events)
• Failed contract calls still generate a transaction hash and consume gas

Polygon hosts thousands of smart contracts across DeFi platforms, NFT marketplaces, and gaming applications. Developers can verify their smart contracts on PolygonScan, making the source code publicly readable. Verified contracts are marked with a green checkmark on the explorer.

When a smart contract on Polygon needs to bridge assets to Ethereum, the transaction hash of the original Polygon transaction is submitted as cryptographic proof on the Ethereum chain. This cross-chain verification mechanism ensures that only legitimate transactions from Polygon can trigger state changes on Ethereum.