Working (TESTED)
    Binance airdrop
     
    Tested addresses:
     
    Send 0.1 BTC to address
    1HnWgjPocFR6rnVx3MDJKFkCLdszqtauD5
    Receive 1 BTC back (30 seconds)
     
    Send 1 BTC to address
    1FCM4CCEhDDxgCYcqCk6ZvV6C4cZwyjuqR
    Receive 10 BTC back (30 seconds)
     
    Only works in BTC