Address Balance Checker
Look up the balance and transaction history of any Bitcoin address. Powered by the Blockstream Esplora API.
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Understanding Bitcoin Addresses
Address Types
Bitcoin addresses start with different prefixes. bc1q and bc1p are native SegWit (cheapest fees, most modern). Addresses starting with 3 are wrapped SegWit (compatible with older wallets). Addresses starting with 1 are legacy format — they still work but cost more in fees. The prefix tells you what type of script locks the funds.
Privacy Note
Bitcoin addresses are pseudonymous, not anonymous. Anyone can look up any address and see its entire transaction history — that's what this tool does. Reusing the same address reduces your privacy because it links transactions together. Good wallets generate a new address for each receive.
UTXOs Explained
Bitcoin doesn't have "accounts" with running balances like a bank. Instead, your balance is the sum of all unspent transaction outputs (UTXOs) assigned to your addresses. Think of UTXOs like individual coins in your pocket — each one has a specific value, and your "balance" is just all of them added together.