A block explorer is a tool that people use to view all cryptocurrency transactions online. Specifically, to view all current and past transactions on the blockchain. In other words, a block explorer is an online blockchain browser which reveals the data of individual blocks and transactions.
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The open source project at Block Explorer makes it easy to explore transactions, blocks, and addresses with their free Bitcoin blockchain explorer. You can also see any fees for transactions, their inputs and outputs, and the number of confirmations.