Photo: Pixabay
Photo: Pixabay
Riccardo Spagni. Supplied
Riccardo Spagni. Supplied
I’m often asked - by non-crypto-loving people, obviously - what blockchain actually does, if anything at all, or why the person in the street should even care.

We live in a world of fake news and deep fakes. Information spreads virally, and nobody challenges it. People resurrect 10-year-old images of an incident and give it a new label - and other people react without bothering to check. The image itself isn’t fake, but the reporting and story around it is.

Deep fakes are particularly terrifying. With today’s technology, if you have eight half-decent pictures of a person, you can create a realistic video of that person saying whatever you want them to.

Adobe has showed off software that lets users edit recordings of speech as easily as you edit a picture. It’s never been easier to put words in somebody’s mouth, in their own voice. And nobody would ever know the difference. Or bother to check.

The bottom line? We can’t trust everything we see and hear online. We certainly should not be trusting “news” on social media.

Which brings me back to my opening question: Why should you care about blockchain? Here’s the thing. There are two big concepts in blockchain that most people don’t think much about: tamper resistance and censorship resistance.

Why does this matter? For a start, when you put a piece of data into a public blockchain, the information cannot be changed, because you hold the private key to that information. Or if you want to do a transaction, or share a piece of information, nobody can say “we don’t like this and will prevent it from being sent”.

That’s extremely powerful. But using the tamper-resistant properties of blockchain, people are able to say: here is my statement, or information.

Blockchain validates the date, content and context - and nobody except me can change it. In a world where fakes are the new norm, tamper-resistance is invaluable.

What about censorship-resistance, you say. If you have never had your freedom curtailed, you probably don’t care about censor-resistance. But perhaps you’ve tried to pay someone on PayPal, and your transaction has been blocked because some filter triggered a flag. You’ve done nothing wrong, but suddenly you’re unable to transact, or receive or spend your money without having to prove who you are and what you’re doing.

That’s the value of censorship-resistant systems. They allow you to say what you want, and do what you want with your own money without being dictated to.

One final thing: there’s no such thing as tamper- or censorship-proof. It’s like driving around in a military tank: it’s not 100% bulletproof, because if you fire at one weak spot for long enough, something will give.

Eventually.

But it’s bullet-resistant - in the same way the blockchain is tamper- and censorship-resistant. I, for one, would rather be taking my chances in a blockchain than outside one.

Riccardo Spagni is lead developer at crypto-currency Monero and co-founder of blockchain start-up Tari.

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