Paper, still have them in my BitStamp wallet.
Realized over 15k gain in a few weeks, in the early exchanges days when you could swap in seconds bitcoin from exchanges (btc-e, bitstamp), making money using the exchanges' prices gap (about 3-5% then).
Bought over 100k$ with real cash on localbitcoin and exchanged it for a profit within the hour, the average transaction was for 15-20k$ at a time with a net profit of 10%.
Lovely days...
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Living the dream.
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