Blockchain’s weakest links
By Chana R. Schoenberger – Blockchain” has become a business buzzword. Commentators, thought leaders, and business experts are highlighting how the distributed-ledger technology promises to revolutionize business and logistics. Universities are teaching courses in blockchain. Blockchain jobs are “booming in Asia,” reports CNBC.
Blockchain “lets us imagine a world that’s not dominated by Google, Facebook, or, for that matter, the [US National Security Agency], one where we, the people, the core components of global society, get to say how our data is managed,” reads The Truth Machine: The Blockchain and the Future of Everything.
It’s a lot of attention for what is essentially an accounting technology. The plumbing behind financial services is generally unaccustomed to such publicity.
Companies are expected to spend $2.1 billion on blockchains by 2018, and $9.2 billion by 2021, according to research firm IDC. But first, like any new technology or market—and blockchain is both, in some sense—it has to overcome a few issues to prove its staying power.
For starters, there are different types of blockchains, and researchers have identified some potentially severe challenges facing the most ubiquitous type, known as “proof-of-work.” The choices companies and others make in the near future about which system to use, and how to use it, will determine how blockchain systems progress—and if blockchain does indeed mark a next era of tech.
Because bitcoin mining is a proof-of-work system, miners use electricity to run computers as they race to solve math problems to earn the right to validate the next block in a blockchain, and thereby win a bitcoin reward. This has raised another big concern with Nakamoto’s system: energy use.
As Bitcoin prices surged, so did mining and its impact on the power grid. If Bitcoin were a country, it would rank 39th in worldwide energy usage, behind the Philippines (38th) and ahead of Austria (40th), more>