What are blockchains?

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What are blockchains?
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Why blockchains—from Bitcoin to Ethereum—have taken the tech world by storm

is a database that contains the history of whatever information it was designed to store. It is made up of a string of “blocks” of information that build on top of one another in an immutable chain., one of the first blockchains, was built in 2009. It stores data on transactions in bitcoin, providing proof of who owns what at any time.

Computers race to solve a cryptographic problem—the first to do so wins newly mined coins—and a new block is added., store more information, such as lines of computer code. A function or application that can be programmed in code can be guaranteed to operate as written. The Ethereum blockchain offers proof that the code was executed.

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