14 July 2015

Media Advisory – New SWIFT Institute paper examines the instability of large Bitcoin mining pools

SWIFT Institute research shows that smaller Bitcoin mining pools may lead to a more stable ecosystem for the digital currency. 

Brussels, 14 July 2015 – The SWIFT Institute announces the availability of a new paper that investigates Bitcoin mining pools and considers whether an evolution towards smaller mining pools might stabilise the Bitcoin system. The report, entitled “Bitcoin – the Miner’s Dilemma” by Ittay Eyal from Cornell University, focuses on inherent dangers of mining pools, an essential part of the bitcoin ecosystem.

Bitcoin introduced the mechanism of an open distributed system that can be secured by requiring participants to present proof of work and rewarding them for participation. A natural process leads participants of such systems to form pools, where members aggregate their power and share the rewards. Mining pools enable small miners to operate with a reasonable business risk. However, when these pools grow too big, they pose a great danger to the entire bitcoin system. The dismantling of overly large pools is one of the most important and difficult tasks facing the Bitcoin community.

It is well-known that a pool can attack another open pool by pretending to work on its behalf, and thereby taking a cut of its proceeds, but never contributing by discovering blocks. Since these attacks do not appear to be prevalent, it looks as if pools make the right choice and agree to refrain from attacking each other.

However, the research shows that this is an unstable balance. It is worthwhile for a pool to refrain from attacking only as a part of an overall truce agreement in which it is not attacked. If a single pool starts attacking its peers, it will force them to retaliate. Once this happens, the profitability of public pools will deteriorate, leading miners to choose other pooling options, for example closed pools of miners that trust one another. Such trust circles are naturally going to be much smaller than open public pools.

The dismantling of overly large pools will bring Bitcoin to a safer footing than what we have today, where a handful of large pools dominate mining. The research shows that short-term incentives can cause this dismantling to occur spontaneously, making the Bitcoin infrastructure more distributed, and therefore more robust and secure.

Peter Ware, Director of the SWIFT Institute says: “Bitcoin is a hot topic in the industry at the moment and our latest research gives interesting insight into the Bitcoin system using game theory to highlight potential pitfalls and suggest ways in which to improve overall stability of the currency.”

Download the media advisory here.

Download the research paper here.


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