you found 50BTC transacted from someone that you dont know what you will do ?
for me i will refund it
and type a note :
dude, your money is not a toy...
tips are welcomed
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what you will do ?
and if you asked him for a tip do you think he will accept ?
or will send some of it only ?
i will refund it back 90% and hold the 10% for my tips
that like what happened when we pick up a fallen wallet in the street and return it back to the wallet's owner