What Are Bitcoin Blocks?


Jake Morr


August 25, 2023

A fundamental unit of the blockchain, a block records a set of confirmed transactions. Preceded by a block header and safeguarded by proof of work, each block includes a hash of the prior block, transactions, and a unique number known as a nonce. Creating a block is intentionally challenging to prevent double-spending of bitcoins. Once transactions within a block are validated, the block is sealed, becoming a permanent part of the blockchain.


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