A double spend has never happened because it is simply not possible. Only one transaction or block made it through, there was a reorg, or something, but it was not spent twice.
Dude,
really.A double spend is exactly that ,
User send btc, merchant accepts btc after in OKPAY case ,
Six freaking hours of confirmations,
blockchain is reorged to a new chain without that specific transaction.
So those coins were spend twice. ie: double-spend
Once with OKPAY and after the reorg with someone else.
That is the whole point to confirmations, that a reorg should be impossible, so in that case mention,
their was a doublespend with bitcoin. Sorry if that hurts your bitcoin cultist beliefs, but it is absolutely true.