GHash Commits to 40% Hashrate Cap at Bitcoin Mining Summit

Organized by and, attendees failed to agree on a fix but laid the foundation for possible solutions.

AccessTimeIconJul 16, 2014 at 5:40 p.m. UTC
Updated Apr 10, 2024 at 2:51 a.m. UTC

UPDATE (16th July 22:55 BST): Updated with comment from bitcoin core developer Peter Todd and Peernova president Emmanuel Abiodun. The draft summary of the summit can be found below.

A summit meant to address the threat of 51% attacks against the bitcoin network has resulted in a renewed industry commitment to protecting the digital currency's transaction processing network from majority control by any one entity.

Organized by controversial bitcoin mining pool and held as scheduled following the most recent CoinSummit London conference, the meeting involved representatives from notable bitcoin companies such as enterprise mining services provider Peernova, mining hardware manufacturers KnCMiner and SpoondliesTech and the Bitcoin Foundation, as well as other key members of the bitcoin community.

According to documents obtained by CoinDesk, all participants agreed that the consolidation of mining power – and the associated threat of 51% attacks – is something that all parties have a vested interest in avoiding. Participants further concluded that short-term remedies are best suited until a permanent fix is discovered and implemented.

Notably,, one of the largest mining pool operators in the ecosystem, has agreed to do all it can to limit its share of the total bitcoin network to 39.99%. This includes asking miners to shift hashing power away from their pools when the hash rate reaches that amount.

A policy of this kind will be recommended to all operators within the bitcoin mining ecosystem.

Though the findings stop short of a conclusive solution, GHash CIO Jeffrey Smith said that temporary ways to mitigate the risk of a 51% attack are the right choice at this time, saying:

"None of the existing technical solutions against the 51% attack threat is able to solve the problem in a long-term perspective, taking into account interests of existing mining pools, individual miners and bitcoin community. Thus, bitcoin adherents should focus on temporary acts until the lifetime solution is found."

The company has taken steps in recent months to assuage community concerns about any role it could have in a 51% attack. In June, the company declared in a statement that it supports decentralization within the mining network and would never participate in fraudulent behavior.

Action committee to commence

Though no lasting solution was found for the 51% threat, the summit did result in a framework that could help the bitcoin industry work toward an eventual solution.

A new committee is expected to be organized by and its digital currency exchange arm,, that direct funds and coordinate efforts on a permanent means to address the problem. The funds will provide a vehicle for "accelerating and motivating developers to find a technical solution to the 51% threat by accumulating funds and directing them to this process".

The document reads:

“The committee will drive closer communication and cooperation between developers working on the bitcoin protocol and solving the 51% issue, and businesses, highly interested in expanding the industry and promote bitcoin to a broader audience.” and will manage the committee, which will consist of representatitves of pool operators, bitcoin companies and other members of the mining community. According to the document, those who attended the summit in London are expected to continue developing a structure for the committee in the months ahead.

Bolstering network confidence

The threat of a 51% attack – the theoretical power of one entity within the bitcoin network to successfully broadcast fraudulent transactions and disrupt legitimate ones – has long been a source of concern for some members of the bitcoin community.

Some of the fear has been directed at itself. This owes to the pool’s outsized hashing power, which some are worried could be used to manipulate transactions in the network. Others who attended the meeting characterized it as an informal effort to open up lines of communication between interests in the space.

co-founder and CEO Will O'Brien told CoinDesk that one of the outcomes of the meeting is that the community itself needs to play a role in finding a solution. O'Brien told CoinDesk:

"It's incumbent upon the industry leaders themselves to make changes that build confidence among the broad bitcoin community, investment community, and the press. We cannot and should not rely on one or more trade organizations to set the rules. Bitcoin is decentralized, and we must build solutions that support that original framework of decision-making."

Peter Todd was less convinced that the meeting had a decidedly positive outcome. He remarked that the gravity of the situation - both in the short-term and in the long-term - may not be fully appreciated by the leadership, saying:

"Talking to the community is a great first step. That said I didn't get the impression that really understood the magnitude of the problem. In particular, they seemed much more focused on getting the bitcoin community to trust them, rather than putting themselves in a position where we don't have too."

He noted that a particularly damaging impact of the centralization of hashing power is a growing fear among investors about the ramifications of a potentially monopolized network.

Todd told CoinDesk that the issue poses a "serious long-term obstacle to investment", but pointed to efforts to develop solutions that he said were promising. Only funding and support, he concluded, will determine how quickly and successfully a fix to the 51% vulnerability is created.

president Emmanuel Abiodun said that, ultimately, the cooperation that began in London will lead to greater transparency in the mining space and a push toward more decentralization. He also said that a new mining pool being developed by Peernova would abide by a similar cap like the one being sought by

He told CoinDesk that it's a matter of ensuring the transaction network remains healthy, saying:

"The hundreds of millions of dollars being put into bitcoin by VCs are worth peanuts if we do not have the secure infrastructure miners are putting into place today. VCs need to engage more with miners and not make the same mistakes that were made in the video streaming industry in taking infrastructure for granted."

Industry-wide issue develops

Members of the bitcoin community have been clamoring for a fix to both the risk of a 51% attack and the conglomeration of hashing power around several large operations. By limiting itself to just below 40%, is acknowledging the need to address what has been called by many a growing problem for the network's long-term health.

The summit - and the proposed committee - also demonstrates a willingness to engage among the bitcoin industry’s major players. As well, the presence of bitcoin core developers and companies outside of the mining sector will no doubt enhance the profile of efforts to develop a fix to the 51% attack issue., as well as other summit attendees, have called on the community as a whole to help realize a solution to the problem. The group has asked for companies to take part in the proposed committee as well as assist in funding research and development that enhances the security of the bitcoin network.

Still, the topic has been much debated in the industry, with some contending that no solution needs to be found to the 51% attack risk.

For more on this issue and its implications for bitcoin, read our most recent report.

Image via Ghash.IO


Please note that our privacy policy, terms of use, cookies, and do not sell my personal information has been updated.

CoinDesk is an award-winning media outlet that covers the cryptocurrency industry. Its journalists abide by a strict set of editorial policies. In November 2023, CoinDesk was acquired by the Bullish group, owner of Bullish, a regulated, digital assets exchange. The Bullish group is majority-owned by; both companies have interests in a variety of blockchain and digital asset businesses and significant holdings of digital assets, including bitcoin. CoinDesk operates as an independent subsidiary with an editorial committee to protect journalistic independence. CoinDesk employees, including journalists, may receive options in the Bullish group as part of their compensation.