How to Use a Bitcoin Block Explorer
A Bitcoin block explorer lets you look up any transaction, address, or block on the Bitcoin network. It's one of the most useful tools for anyone holding or using Bitcoin — and it's completely free and requires no account.
What Is a Block Explorer?
Bitcoin's blockchain is a public ledger. Every transaction ever made is recorded permanently and visible to anyone. A block explorer is a website that lets you browse this data in a human-readable format.
You can look up:
- A specific transaction (by its txid)
- A Bitcoin address (to see its balance and history)
- A specific block (to see all transactions in it)
- Current mempool status (unconfirmed transactions)
- Fee estimates
Best Bitcoin Block Explorers
mempool.space
The best all-around explorer. It shows the mempool in real time — you can literally watch transactions flow through and see which fee rate gets confirmed next. The visualizations are excellent. You can also run your own mempool.space instance if you want full privacy.
blockstream.info
Clean, fast, and reliable. Built by Blockstream. Supports Tor (.onion address available). Good for basic lookups. Also covers the Liquid Network if you use that.
btcscan.org
Lightweight and privacy-focused. No tracking, minimal JavaScript. Good if you want a simple lookup without much overhead.
blockchain.com/explorer
The oldest and most well-known. Still works fine, but blockchain.com tracks users and has a commercial agenda. I'd use mempool.space or blockstream.info instead.
How to Look Up a Transaction
- Go to mempool.space
- Paste your transaction ID (txid) into the search bar
- Hit enter
You'll see the transaction details: inputs, outputs, fee paid, fee rate (sats/vbyte), confirmation status, and which block it was included in.
Understanding What You're Looking At
Confirmations
When you send Bitcoin, your transaction first sits in the mempool (waiting to be included in a block). Once it's in a block, it has 1 confirmation. Each subsequent block adds another confirmation. Most exchanges consider a transaction final at 3–6 confirmations.
Fee Rate
Measured in satoshis per virtual byte (sats/vbyte). Higher fee = faster confirmation. mempool.space shows you the current fee market so you can estimate how long your transaction will take.
UTXO
Bitcoin doesn't work like a bank account. You have unspent transaction outputs (UTXOs). When you "send Bitcoin," you're actually consuming existing UTXOs and creating new ones. Block explorers show this clearly.
Checking an Address Balance
Search any Bitcoin address to see its current balance and full transaction history. Note: this reveals your balance to anyone who knows your address. Bitcoin is pseudonymous, not anonymous — address reuse reduces privacy significantly.
Privacy Considerations
When you look up your own transactions in a block explorer, you're sending your IP address and that address/txid to a third-party server. If privacy matters:
- Use Tor when searching
- Run your own mempool.space instance
- Use blockstream.info's .onion address
Mempool Fee Estimation
Before sending, check mempool.space to see current fee rates. The site shows a recommended fee for different urgency levels (next block, within an hour, etc.). This saves you from overpaying or getting stuck with a low-fee transaction.
Summary
Block explorers are essential tools. Bookmark mempool.space — it's the most useful one for most situations. Use it to verify transactions, check fees before sending, and understand what's happening on-chain.
Also see: How to Read the Bitcoin Blockchain | Bitcoin Security Checklist | Bitcoin Wallet vs Exchange