What is the main purpose of Blockchain?

Related questions

1. Do all Cryptocurrencies use Blockchain?
2. What's so special about Blockchain?
3. What does Blockchain do for Bitcoin?
4. What is Blockchain simple explanation?
5. What is the need of Blockchain?
6. What is Blockchain in real life?
7. Can I change the world?
8. What is Blockchain currently used for?
9. How is Blockchain different from Bitcoin?
10. Why do we need Blockchain?

Tags

1. #alteration
2. #involved
3. #digital
4. #decentralized
5. #distributed
6. #public
7. #cannot
8. #across
9. #altered
10. #blocks
11. #blockchain
12. #record
13. #ledger
14. #subsequent
15. #without
16. #retroactively
17. #transactions
18. #computers