A block explorer is a website that lets anyone search a public blockchain and see its blocks, transactions, addresses and balances. Buyers use one to check that crypto sent to their wallet is on the blockchain and to follow its confirmations, using the transaction ID or the receiving address.
How does a block explorer work?
A block explorer reads data from a blockchain network and turns it into pages you can search. A blockchain is a public ledger, so anyone can look up any block, transaction or address.
Search a TXID (transaction ID) and the explorer shows whether the transaction is pending or confirmed, which block holds it, the addresses involved, the amount and the fee. Search an address and it shows the balance and transaction history. Each explorer covers its own networks: a Bitcoin TXID will not show up in an Ethereum explorer. As of September 2026, well-known explorers include mempool.space (Bitcoin) and Etherscan (Ethereum).
Example: how do you check a transaction?
Say you bought bitcoin and want to check the transfer to your wallet:
- Copy the TXID or your address. Your wallet usually shows the TXID in the transaction details.
- Search it in a Bitcoin explorer. Type the explorer’s web address yourself, then paste the ID.
- Read the result. Check that the receiving address is yours. “Unconfirmed” means it is still waiting in the mempool. Once it is in a block, the explorer counts its confirmations.
Why does a block explorer matter when you buy crypto?
Crypto is delivered to the wallet address you provide. A block explorer lets you check that transfer yourself. Confirmation times depend on network traffic: see blockchain delays and confirmations and how to find a transaction on the blockchain.
Buying bitcoin? See the Bitcoin price and payment options.
What are the risks and red flags?
- An explorer cannot undo a payment. It only shows data. See why blockchain transactions cannot be reversed.
- Pending is not final. Treat coins as received only once they have confirmations.
- Proof can be faked. Screenshots and lookalike explorer sites can be forged, so check the TXID and address yourself, in full. See how to protect yourself from fraud.
- Lookups are not private. An explorer website can link your IP address to the addresses you search. Checking in your own wallet reveals less.
Go deeper: How to send Bitcoin to a wallet, step by step.
