A blockchain explorer is a tool that allows users to view and explore the contents of a blockchain. It allows users to see the details of individual transactions, as well as the overall structure and history of the blockchain.

Blockchain explorers are useful for a variety of purposes. They can be used to track the movement of cryptocurrency, to verify the authenticity of transactions, and to monitor the health and activity of a blockchain. Some blockchain explorers also provide information about the participants in the network, such as the addresses of the nodes and the number of transactions they have processed.

There are many different blockchain explorers available, each with its own features and capabilities. Some of the most popular blockchain explorers are Blockstream Explorer, Etherscan, and Blockchair.