Bitcoin vs distributed ledger vs Ethereum vs blockchain

Forget vague notions of trust – code is law on these new transactional platforms

We're often being told that the blockchain – the tech behind Bitcoin – will rewire not just the banking sector, but social security payments, healthcare and even digital voting. Until now, it's all been theoretical tech industry talk. However, in recent months there's been a flurry of interest from the wider world, and some big developments that look set to shape a future blockchain economy.

It emerged recently that China will use blockchain for making social security payments, while Australia has proposed using blockchain to run its voting systems. Meanwhile, Hillary Clinton has publicly backed using blockchain for public services.

Is blockchain – and its associated technologies and platforms, including Bitcoin and Ethereum – about to blossom from being an obscure niche technology to become the basis of a new kind of global public infrastructure?

Image Credit Carlos Delgado Wikimedia

Image Credit: Carlos Delgado/Wikimedia

Store, share and secure

As a way to store and share data with high integrity – where data is protected from malicious attacks and where every change is recorded and audited – blockchain could help make the world's data safer. But as with any sector of emerging tech, there are competing standards, incompatible systems and a constant stream of new innovations and platforms.

"Blockchain can be thought of simply as a shared ledger, with the technology behind the scenes ensuring that it is secure, up-to-date, and tamperproof," says Jaco Cebula, Chief Technology Officer at investment services company Multrees. "Access to this ledger can either be public or private depending on the application."

Bitcoin

The commodification of trust

Blockchain is all about trust, or rather, 'trustlessness', through clever cryptography. Malicious attempts to view or change the data become part of the data itself, making third-party hacks immediately obvious.

"A blockchain is the database equivalent of writing in indelible ink, rather than in changeable pencil. If you try to change it after you've written it, people are going to notice afterwards," says Dave Hrycyszyn, director of strategy and technology at digital agency Head. You don't need to trust other people, you can trust the system. Online trust becomes a commodity.

Competition time?

Don't confuse these terms with actual products. Blockchain – also known as distributed ledger – is a technology, not a product. It's most famously been used to create cryptocurrency (Bitcoin) and to make smart contracts (Ethereum), and many more uses will follow, each with a new name.

"The technologies that underpin blockchain – distributed data and cryptography – have been available for a long time," says Cebula. "It is the linking of them together into a single technology that provides the benefits … there are no similar offerings."

Apps and smart contracts

While Bitcoin is infamous, Ethereum has a far lower profile. But it could help the blockchain have a far greater impact. A decentralised platform for applications that run exactly as programmed without any chance of fraud, censorship or third-party interference, Ethereum extends blockchain beyond cryptocurrency. It's currently being talked-up as a possible successor to Bitcoin.

"Like Bitcoin, Ethereum can act as a currency, this time called 'ether'," explains Hrycyszyn, but Ethereum's blockchain goes much further by adding the capability to write smart contracts into the blockchain that are automatically executed when specific conditions are met.

"You could have a bet saying 'watch the BBC news feed and transfer two units of ether to my friend Ramsey if Donald Trump becomes President of the United States'," says Hrycyszyn. "The contract would be executed automatically by the Ethereum system, if the conditions specified in the contract are met … proponents of smart contracts think that they could be the basis of entirely new economic models in the future."

Top Image Credit: Barclays