Wow, i am glad i didnt send the btc back I got paid double.

Freaking scammer
you got 8.4 btc by api mistake. you don`t want to send it to op!
and you claim op as scammer?!!I dont think blockchain API is at fault. They handle millions or $ each day.
Shitty script by OP is. He should refund you guys from the fee he took.