Bitcoin trading surpasses Gold. It is hard to ignore that trading volumes for major digital currencies like bitcoin and ethereum have skyrocketed in recent years. For example, daily trading volumes for bitcoin were $400mn in 2012 and have now moved up to about $2bn a day at present" which also means that - at current BTC prices - the total ADV of BTC traded is higher than that of GLD.
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http://www.zerohedge.com/news/2017-07-25/daily-trading-volume-bitcoin-surpasses-gld