A block explorer is a free website that lets anyone look up what is happening on a blockchain - every wallet, transaction, and token is public, and the explorer is the window into it. You paste in an address or a transaction ID and it shows you the full history: what moved, when, between whom, and whether it confirmed. The practical reason to learn it is verification: before you trust a token, you can check on the explorer that it is real, who issued it, and how many exist - no permission or account needed.

The two you will use most are Etherscan (for Ethereum) and Basescan (for Base). They work the same way, because they read the same kind of public blockchain.

What can a block explorer show me?

A block explorer indexes everything on the chain and makes it searchable. Three kinds of lookup cover almost everything a beginner needs:

• An address - every transaction a wallet has sent or received, and its current balances.
• A transaction - the details of one transfer: amount, sender, recipient, fee, and whether it succeeded.
• A token - the contract behind a token, how many exist, and how many people hold it.

Step 1: Pick the right explorer and paste your ID

Go to the explorer for the network you are on - Etherscan for Ethereum, Basescan for Base. Paste what you want to look up into the search bar: a wallet address, a transaction hash (a long "0x" string), or a token's contract address. The explorer figures out which kind it is and shows the matching page.

Step 2: Check that a transaction confirmed

For a transfer, the page shows a status - "Success" means it went through. You will also see the amount, the sender and recipient addresses, the gas fee paid, and the time. If you just sent USDC and want to be sure it landed, this is where you confirm it, rather than guessing from your wallet.

Step 3: Verify a token before you trust it

This is the step that protects you. Open the token's page by searching its contract address - the unique on-chain address of the smart contract that runs the token. On that page, check:

• The name and symbol, and whether the contract is marked verified (the code is published and readable).
• The token standard, such as ERC-20 - a common token standard that defines how the token behaves.
• Total supply and holders - how many tokens exist and how many addresses hold them.
• The issuer. Get the official contract address from the project's own site, then confirm it matches what you are looking at. Scammers create fake tokens with the same name, so the address is the source of truth, not the name.

Step 4: Trace where a token came from

Every token is created by minting - the on-chain event that brings new tokens into existence. The explorer lists these events, so you can see when a token was issued and by which address. For a real-world asset, this lets you sanity-check that the supply and issuer match what the platform claims.

Why does this matter for RWAs?

With a tokenized real-world asset, the explorer is how you independently confirm the on-chain facts: that the token exists, that the issuer's address is the one the platform published, and that transfers and distributions actually happened. It does not prove the off-chain asset is sound - that still takes due diligence - but it removes any need to take the on-chain side on trust.

Where to go next

• Next: what a layer 2 is, and why RWAs use Base.
• Back up: how to get USDC and keep it safe.
• Glossary: smart contract.

Sources: Etherscan (etherscan.io); Basescan (basescan.org), as of 2026.