THE CASE AGAINST ASICS
In 2014, almost a year before Ethereum launched, Vitalik Buterin visited an “unassuming little building in Shenzhen, China” where he found a small stack of Bitcoin ASICs waiting to be shipped on the third floor. In a blog post, Buterin recounted how on the floor below he found stacks of ASICs that accounted for a quarter of the computing power added to the Litecoin network every day.
Buterin marveled at how this one small factory in China was producing this much new computing power everyday on its own. It was hardware centralization in action. The question for Buterin was whether the centralization of ASIC production was actually a bad thing for a cryptocurrency network. After all, the production of GPUs and CPUs is highly centralized as well, with a handful of companies such as Nvidia, AMD, and Intel dominating the market.
“With ASIC miners, right now things are still not too bad,” Buterin wrote in the 2014 blog. “Although ASICs are produced in only a small number of factories, they are still controlled by thousands of people worldwide. Soon, however, that may change. In a month’s time, what if the manufacturers realize that it does not make economic sense for them to sell their ASICs when they can instead simply keep all of their devices in a central warehouse and earn the full revenue?”
Today, as in 2014, there are a handful of companies that make cryptocurrency ASICs, although a Chinese company called Bitmain has established itself as a clear leader in the field. Bitmain’s Antminers have become basically synonymous with Bitcoin mining, but the company isn’t just making these chips to sell them—just as Buterin predicted, it also keeps a lot in its own mines. BitFury, an American company, follows a similar business model.
When I spoke to Bitmain’s marketing manager Nishant Sharma over email, he said the company doesn’t disclose how many ASICs it is producing as a matter of policy. Furthermore, he said he didn’t how many Monero and Ethereum ASICs the company plans on keeping for itself in its own mines.
At the time of writing, Bitmain’s two mining pools account for approximately 40 percent of the total computing power on the Bitcoin network. Controlling this much of the Bitcoin network means Bitmain also has an outsized influence on the ecosystem. During the Bitcoin forking bonanza last year, Bitmain played a major role in the decision to fork Bitcoin into two versions: Bitcoin core and Bitcoin Cash. There is also the specter of a long-theorized “51 percent attack,” when one miner can hold Bitcoin’s hash power hostage and wreak havoc with the network for as long as they’re in charge.
Depending on one company for the majority of the hardware securing the blockchain also poses security risks. For example, in April 2017, anonymous researchers found a firmware vulnerability in Bitmain antminers called Antbleed, which was billed as an ASIC “kill-switch.” This vulnerability allowed Bitmain, a government, or other bad actors to remotely stop Bitmain ASICs from mining on the network, which could cripple Bitcoin. Bitmain denied it was malicious and issued a patch for the vulnerability a few days after it was discovered.
The proliferation of ASICs on a network also gradually pushes out miners running GPUs or CPUs, raising the financial barrier to entry. As these less efficient miners’ share of the network computational power shrinks, it eventually reaches a point where the cost of the electricity needed to run these miners is more than they’re earning by mining. These miners can either fork over the cash to buy an ASIC and keep mining, or switch to a different coin.
Jimmy Song, a main Bitcoin developer, told me he doesn’t see the centralization of ASIC production as much of a problem.
“It’s only a problem in the short term since Bitmain has the majority of miner manufacturing ability,” Song told me in a Twitter message. “Long term there are a lot of players that are looking at the margins Bitmain is making and licking their chops waiting to get in. I know of at least four startups trying to dethrone Bitmain and there’s also bigger players like Intel, Samsung, and Nvidia that have to be looking at this because the margins are so large.”
Given Bitmain’s domination of the mining industry and less-than-transparent corporate practices, Spagni and many in the Monero community hold the company in bad faith. But even beyond Bitmain and monopoly concerns, the tendency towards centralization in ASICS themselves has the community worried.
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