Say, someone was scammed by a false online bitcoin mining service. He invested some money to buy the scammer’s service, the service was said to produce bitcoins online at a very fast speed without any user operation.
But when the victim was about to withdraw his money from the online mining site, his money was frozen.
You must keep online while the mining is running, or you will not get your money back.
Yes, he got offline while mining, but the online mining was said to run at least 7 days to get money, and hanging 7 days online is pretty much impossible.
Could the scammer be accused? What evidence could the victim provide to accuse him?