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What Is Blockchain?

A blockchain is a shared, tamper-resistant digital ledger maintained by a network rather than a single authority. Learn how blocks, consensus and smart contracts work — and what blockchains are actually used for.

October 1, 2026

Frequently asked questions

Is blockchain the same thing as Bitcoin?

No. Bitcoin is a digital currency; blockchain is the underlying ledger technology that records Bitcoin transactions. The same ledger concept can record other assets, contracts and data — Bitcoin was simply its first large-scale application.

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