What Is Blockchain?

A blockchain is a distributed, immutable digital ledger that records transactions across a network of computers. Each block contains a batch of verified transactions and is cryptographically linked to the previous block. Blockchains enable trustless, transparent transactions without intermediaries. Sonar Tracker monitors transactions across Ethereum, Bitcoin, Tron, Polygon, Avalanche, BSC, Arbitrum, Optimism, and other major blockchains.