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Are there any proof-of-work systems used by exchanges? If not, are there any interesting proposals worth reading?

In principle, there might be applications for proof-of-work systems in preventing algorithms from flooding exchanges either to manipulate prices or gain information, or perhaps to limit the advantages of physical proximity. An exchange might require a proof-of-work computation when withdrawing an order, for example, which makes placing and withdrawing a large number of orders unsafe.

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Connections to exchanges aren't public. The exchange knows who is sending the requests, even if they don't publicize it. Many exchanges (e.g. US futures) have messaging limits and penalize you if you violate them. –  Joshua Ulrich Jan 29 at 0:48

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Proof of work systems are generally used where you do not trust the client; the Bitcoin one is used to slow down the generation of new coins and is adaptive; if hardware speeds up, the work gets harder.

By contrast, an exchange has a contractual agreement with the client, and can require it to authenticate, encrypt etc.

The central problem, though, is that exchanges want to be low-latency, which is the opposite of a proof-of-work system.

A more convincing solution to the current problems of HFT is to have a minimum (or fixed) order lifetime; any order is valid for x seconds. Much of the HFT activity involves submitting and cancelling orders very quickly just to test the water and discover information about the order book, or to fool less sophisticated algorithms. By fixing the order lifetime, the orders can actually be filled.

On the other hand, if there was a kind of Bitcoin-style exchange with a public interface, there might be cause for trust-less transactions, but I suspect that would involve escrow of margin, rather than proof of work on the interface.

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Oh that's an interesting idea, thanks. –  Jeff Burdges Jan 29 at 23:34

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