# blockchain

/ˈblɑktʃeɪn/ (US) · CEFR C1 · Noun

Source: https://englishreference.com/word/blockchain
Updated: 2026-07-19

## Definition

a digital record book that is shared across many computers. It is used to safely store information, like cryptocurrency payments, so that no one can secretly change or delete the data.

For teachers: a decentralized, distributed public ledger consisting of records called blocks that are securely linked together using cryptography. It ensures data integrity by making it computationally difficult to alter past transactions without network consensus.

## Examples

- The new cryptocurrency uses a secure blockchain to track all payments.
- To improve transparency in the supply chain, the company records every shipment on a public blockchain that anyone can verify.
- Because a blockchain relies on a distributed network of nodes to validate transactions, it eliminates the need for a central banking authority while maintaining a permanent, tamper-proof ledger.

## Usage notes

- Often functions as a noun adjunct in phrases like 'blockchain technology' or 'blockchain network'.

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