Really cool Luke, thanks for sharing!
One improvement that could be great would be to see the historical prices of these currencies, that's useful for analysing when to buy & sell.
One way to add this new tab would be to use this JSON importer :
https://github.com/pipaman/google-docs/blob/master/scripts/ImportJSON/Code.gs
and getting the historical data from Coincap for example:
http://www.coincap.io/history/365day/BTC
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It already has the JSON importer to get the current rates. It wouldn't be too difficult to take a snapshot and save that off. I've modified my personal copy to have a button to refresh the rates and another button to take a snapshot of my holdings and save them off so I can see the change over time. I don't want to add those to the main spreadsheet though because once I added the button it asked me give the spreadsheet permissions to my account which I'm guessing most people will not prefer.
Got it, thank you!