Etherscan

Etherscan is a public window into Ethereum activity. It lets users look up transactions, wallet addresses, token transfers, contracts, and token approvals.

Why Beginners Need It

When a DApp page is confusing, Etherscan can help you verify what actually happened on-chain. You can check whether a transaction succeeded, failed, is pending, or used gas.

What to Search

Start with three things: transaction hashes, wallet addresses, and token approvals. A transaction page shows status and gas usage. An address page shows history. The approvals page helps identify contracts that can spend your tokens.

Important Limitation

Seeing a contract on Etherscan does not prove it is safe. A block explorer displays data; it is not a security audit or an investment recommendation.

Reading a Transaction Page

The fields that matter most are near the top. Status is success, failed, or pending. Gas used against the gas limit tells you whether the transaction ran out of room — a failure at exactly the limit usually means the limit was too low, not that the contract rejected you. The nonce is the sequence number for that address, which is why a stuck low-nonce transaction blocks everything behind it. Internal transactions appear on a separate tab and are how contracts move value between each other; funds arriving from a swap or a bridge will often show there rather than in the main list.

Reading an Address Page

An address page mixes several things that are easy to confuse. The transaction list shows what that address sent or was sent directly. The token tabs show balances and transfers that happened through token contracts, which is why a token can appear in your wallet without any matching transaction from you — anyone can send a token to any address without permission. Unsolicited tokens are common, and interacting with one is the entire point of the scam. Seeing it in the list is harmless; approving or swapping it is not.

What Contract Verification Actually Proves

A green checkmark on a contract means the published source code compiles to the bytecode deployed on-chain. That is a useful and real guarantee — it means you can read what the contract does rather than guess. It is not an audit, not an endorsement, and not a statement that the code is free of backdoors. Plenty of verified contracts contain mint functions, transfer restrictions or owner privileges, all sitting in plain sight in code nobody read. Verification makes inspection possible; it does not perform the inspection.

Other Networks Have Their Own Explorers

Etherscan covers Ethereum mainnet. The same team and the same interface run Basescan for Base, Arbiscan for Arbitrum and Optimistic Etherscan for OP Mainnet, while Solana uses entirely separate explorers. A hash from one network will simply not resolve on another's explorer, which is a common source of "my transaction does not exist" panic. Bookmark the explorer for each network you actually use, and check the network before concluding anything is missing.

Official Links

• Etherscan: https://etherscan.io/
• Token approvals: https://etherscan.io/tokenapprovalchecker
• Token tracker: https://etherscan.io/tokens