Technologycalendar_todayLast updated: Apr 2026
What is Blockchain?
/blɒkˈtʃeɪn/
A decentralised digital ledger that records transactions across many computers simultaneously. Once recorded, data cannot be altered without changing all subsequent blocks.
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Everyday Example
Think of a blockchain like a shared Google Doc that thousands of people hold copies of simultaneously — and where every edit is permanent, timestamped, and visible to everyone.
publicReal-World Application
“Bitcoin uses blockchain to enable peer-to-peer money transfers without a bank as intermediary. Every Bitcoin transaction is recorded on a public blockchain visible to anyone.”
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Did you know?
The concept was first described in 2008 by the pseudonymous Satoshi Nakamoto in the Bitcoin whitepaper.
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Key Insight
The power of blockchain is the ability to create trust between parties who don't know each other, without a central authority.
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