Quote from: dscotese on March 08, 2013, 05:18:53 PM

Quote from: Endgame on March 08, 2013, 12:34:36 PM

Quote from: dscotese on March 07, 2013, 09:16:34 PM

Quote from: buryfarmer on March 07, 2013, 01:07:31 AM

80% of bitcoin trade happens at Mtgox which is centralised.

How do you get 80%? Is there a well-defined set of bitcoin addresses that belong to MtGox so that we can compute the ratio of the value of transactions involving them to the value of all transactions?

You can work out roughly what percentage of bitcoin trading is happening through Mt.Gox by looking at the volumes of the different exchanges listed at www.bitcoincharts.com/markets. In the last 30 days, roughly 2.1 M bitcoins have been traded through Mt.Gox, and roughly 2.8 M have been traded through all of the exchanges combined. So Mt.Gox has about 75% of the market.

Thanks. So that is in currency trade and excludes exchanges not listed. How do we get a handle on how much btc-fiat exchange is going on outside of those listed exchanges? About half of my own bitcoin came from personal exchanges, though it's not much.

That's a good point. I don't think there's any good way to measure these kinds of off-exchange transactions. Perhaps some of the larger person-to-person traders could shed some light on the size of these markets? If you were to take the off-exchange transactions into account, Mt.Gox would probably have a much smaller percentage of bitcoin trade.