blockchain

American  

[blok-cheyn] / ˈblɒkˌtʃeɪn /

noun

Computers.

1. a structure used for a distributed or shared database consisting of discrete blocks of data, with each new block secured and connected to earlier ones by cryptography: used to create digital ledgers for cryptocurrency systems, among other things.

   Several schools now offer courses in the technology behind blockchain.

   Under the scheme, farmers would add information about their produce to a blockchain database that could quickly pinpoint contamination.

2. a distributed or shared database created and populated using a structure consisting of discrete blocks of data, with each new block secured and connected to earlier ones by cryptography.

   Once the transaction gets verified, it's recorded in the blockchain.

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Etymology

Origin of blockchain

First recorded in 2010–15; block ( def. ) + chain ( def. )

Explanation

A blockchain is a shared computer database that's mainly used for keeping records of cryptocurrency transactions. When someone buys or sells Bitcoin, they use a blockchain to safely record the details. A blockchain works like a shared spreadsheet, with data entered into separate cells or columns. The special thing about blockchain is that once information is put into each block, it can't be changed, making it an extremely secure way to store data. The name blockchain comes from the blocks of data, linked together in chains through cryptography.

Example Sentences

According to the blockchain analysis website Bubblemaps, six accounts were created on Polymarket in February.

From BBC • Apr. 19, 2026

He foresees a “highly probable future” where blockchain becomes a major venue for NYSE’s core operations, such as trading, clearing, settlement, capital formation and data distribution, Blaugrund said.

From The Wall Street Journal • Apr. 17, 2026

Drift Protocol lost approximately $285 million in an April 1 cryptocurrency heist, which blockchain analytics companies attribute to North Korea.

From The Wall Street Journal • Apr. 15, 2026

This was a popular strategy in late 2017 and early 2018, as businesses sought to hop on the blockchain bandwagon.

From MarketWatch • Apr. 15, 2026

Crypto firms seek 24/7 blockchain stock trading, but the SEC’s exemption is expected to be incremental, a “proof of concept”.

From Barron's • Mar. 31, 2026