I never invested with pirate or sent any BTC to him. Could that be a SR account?
I don't know. Whoever it is that you accidentally sent your bitcoins to, it was someone who had previously this year sent 10,000 to 1DkyBEKt5S2GDtv7aQw6rQepAvnsRyHoYM. That isn't exactly a small amount of bitcoins. It could be SR, it could be a lot of things, but it is someone who has (or at least had back in April) access to over 10,000 BTC and sent 10,000 BTC to 1DkyBEKt5S2GDtv7aQw6rQepAvnsRyHoYM