The public record of every transaction, readable by anyone, needing no account. Most people meet it in a panic and cannot find the one line that answers their question.

A block explorer is a website that reads a public blockchain and shows it to you in a table. It is not a company's dashboard and it is not a service you sign up for. Every explorer for a given network is reading the same data, which is why two of them will never disagree about whether your transfer went through.

This matters more than it sounds. When an exchange says a withdrawal was sent and your wallet shows nothing, one of them is describing the record and the other is describing its own database. The explorer is the record.

The three things you can look up

A transaction hash. A long string starting with 0x on Ethereum-style networks, a different format elsewhere. It identifies one transfer, permanently. Whoever sent your coins can give you this, and if they cannot, they did not send them.

An address. Shows the balance and the full history of what went in and out. Yours, or anybody else's — every address on a public chain is public.

A block. The container that transactions get packed into. You rarely need this, but it is where the timestamps come from.

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What the fields on a transaction page mean

1. StatusSuccess, pending or failed. These are three different situations and the difference decides what you do next. More on this below, because "failed" surprises people.
2. ConfirmationsHow many blocks have been added since the one containing your transaction. Zero means it is in a block but nothing has been built on top yet. The higher the number, the harder it becomes to undo. Exchanges pick their own threshold before they credit you.
3. From and ToThe sending and receiving addresses. Check the To field character by character against the address you intended — this is where a clipboard swap becomes visible after the fact.
4. ValueThe amount of the network's own coin that moved. If you sent a token rather than the native coin, this field often reads zero and the real movement sits lower down under token transfers. That zero is not an error.
5. Transaction feeWhat you paid the network. Separate from the amount sent, and paid in the network's own coin, which is why you can hold a token and still be unable to move it.
6. TimestampWhen the block was produced. This is the actual time your transfer happened, regardless of when an app got round to showing it to you.

Pending, failed, and the difference

Pending means the network has seen your transaction but has not included it in a block yet. Usually the fee was set too low for current demand. The coins have not moved and they have not gone anywhere — the transaction is sitting in a queue. On busy networks this resolves in minutes; occasionally it takes much longer or the transaction is eventually dropped and the coins were never spent.

Failed is the one people misread. A failed transaction was included in a block, executed, and did not complete — a contract rejected it, a slippage limit was hit, gas ran out. The amount you were sending stays where it was. The fee does not come back. You paid for the computation, which happened, and produced a rejection.

Success means it executed. It does not mean it did what you intended. A successful transaction that sent coins to the wrong address is a success as far as the network is concerned.

Using it to answer real questions

"The exchange says it sent my withdrawal." Ask for the transaction hash. Paste it into the explorer. If it exists and shows success with your address in the To field, the coins are on the chain and the problem is on your side — usually the wrong network or a wallet not showing a token. If the hash does not exist, nothing was sent.

"Someone says they paid me." Look up your own address. Incoming transfers appear there within seconds of confirmation, whether or not any app has noticed.

"Is this token contract the real one?" That is a bigger question and it has its own page.

What the explorer will not tell you

It shows movements between addresses. It does not show who owns them. Labels you see on some explorers — an exchange name next to an address — come from that explorer's own research, are often right and are never authoritative.

It also cannot tell you whether a transfer was fair, wise or consensual. Theft looks identical to a payment. This is the honest limit of the tool: it is a perfect record of what happened and says nothing at all about why.