Basics · Beginner lesson · about 6 minutes
Blockchain
A shared record that many computers can check.
The short answer
A blockchain is a shared record updated under published network rules. It is not automatically private, accurate, or valuable.
In plain English
A blockchain is a shared record updated under published network rules. It is not automatically private, accurate, or valuable.
This lesson belongs to the basics cluster. The details differ by network and service, so use the linked sources and the project’s own documentation when a decision depends on current behavior.
What can go wrong
Read this before you act.
A network’s rules, participants, and data availability matter more than the word blockchain alone.
Check your understanding
A few questions. Not a test.
Choose an answer to see why it is right or wrong. Nothing is locked behind a score.
Sources and corrections
This lesson is a starting point. When details matter, read the official pages we link below, and tell us if something needs a correction.