“Blockexplorer” or “Block explorer” is a tool used to verify the historic and information about all transactions from a cryptocurrency online (it’s important to notice that some cryptocurrency like Monero has a private blockchain what make impossible to check the history of transactions, balance of wallets, etc).
Blockexplorers provide many useful tools like who sent the coins to the address, where the coins was sent, when, and even the balance of the wallet.
You can read more here.
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