Relying only on publicly disclosed data, what is the most expensive Bitcoin purchase that has ever occurred?
"Expensive" can be determined either by:
- Highest purchase price in Bitcoins
- Highest fiat value equivalent at the time
I'd say it was the selling of dice gamling site SatoshiDice in 2013, according to the former owner it was sold for 126,315 BTC which was equivalent to ~$11,5 Million at that time.
More details can be found here: https://bitcointalk.org/index.php?topic=101902.msg2751536#msg2751536
If you mean the greatest amount of bitcoin spent, the "bitcoin pizza" comes to mind. At a whopping 10k BTC spent.