Blockchain Fundamentals

Block Explorer

Also: Chain Explorer

A public website that lets anyone look up blocks, transactions, and wallet addresses on a chain. It is the quickest way to verify that a payment really happened, with no one's word needed. Etherscan and mempool.space are common examples.

General education, not investment, legal or tax advice. Markets and regulation change quickly: where a definition depends on current law or on a recent event, check the latest coverage before relying on it.