Bitmain, which designs application-specific integrated circuit (ASIC) chips and manufacturers cryptocurrency miners, is rapidly approaching a 51% controlling share of bitcoin’s global mining hashrate.

According to data analyzing Bitcoin’s latest blocks by mining pool, Bitmain now accounts for more than 42% of the total Bitcoin hashrate. This is largely driven by two major Bitmain-owned mining pools, BTC.com and Antpool, which account for 25.5% and 16.5%, respectively.

The crypto news sphere has been abuzz about 51% attacks, and what the growing number of attacks means for the future of cryptocurrency. A 51% attack is when a person or group is able to control more than 50% of the hashrate (computing power) on a blockchain and create havoc. That havoc involves transactions being halted or reversed and double spending being enabled. The blockchains for Verge (XVG), Bitcoin Gold (BTG), and ZenCash (ZEN) have all become victim to this kind of cyber attack.

While it’s unlikely that Bitmain would attempt any sort of attack, the relative centralization of hash rate is of concern to the Bitcoin community as the risk will always linger.

As Bitmain prepares to go public later this year, the company has reportedly raised $400 million in funding. According to China Money Network, Bitmain has been valued at $12 billion, though they have not yet confirmed their funding round publicly.

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