blockchain
A blockchain is a shared record of transactions that thousands of computers hold copies of, so nobody can quietly change history.
In plain English
Forget the hype for a moment and consider the actual problem it solves.
Every ledger in the world sits somewhere. Your bank holds the record of your balance. A land registry holds the record of who owns what. You trust those records because you trust the institution holding them, and in Nigeria that trust has been tested more than once.
A blockchain removes the single keeper. Instead of one institution holding the ledger, thousands of computers each hold a copy. When a new transaction happens, they all agree on it and it is added as a new block, chained to everything that came before. Changing an old entry would require rewriting every copy on every machine simultaneously, which is why it is treated as effectively permanent.
That is genuinely useful. Land titles that cannot be quietly altered. Supply chains that can be traced. Money that moves without a bank's permission.
It is also spectacularly oversold. Most things called blockchain projects are ordinary databases with a fashionable name, and a great many are simply frauds wearing technical language as a disguise.
Judge the problem being solved, never the word being used.
A land registry on a blockchain would mean nobody could quietly alter a title deed after the fact, because thousands of copies would disagree. In a country where the same plot has been sold to several families, that is not a small idea.
Questions people ask
Is blockchain the same as bitcoin?
No. Blockchain is the underlying technology. Bitcoin is one thing built on it, in the same way email is one thing built on the internet.
What is it actually good for?
Situations where several parties must agree on a record and none of them fully trusts the others. Where a single trusted institution already works well, it usually adds cost rather than value.
Why are so many blockchain projects scams?
Because the language is complicated enough to hide behind. If somebody cannot explain what problem their blockchain solves in one plain sentence, assume there is not one.
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