If someone wants to buy with paypal
1. Open an ebay auction of any item, like personal painting
2. Sell the item NOT the coin
3. Give the coin a free gift with it
4. SEND the painting, with a witness, all postage papers and so on
So its very hard for scamers to tell ebay, that they want their money back. They still can, the ebay paypal account got hacked trick, but then we talk about serious crime here.
So maybe dont sell more then XY$
But I think if the guy did a "gift" through Paypal nothing can be done.
Lol, i hope you are joking. No way you can be serious.
You have to prove you sent the item. Send he painting by guaranteed delivery, signed for. As a free gift you offer the coins to be given when the painting has been signed for,
They'll have a harder time getting you that way.
I had a experience on ebay. I proved I supplied the coins with snapshots of the transactions, copies of emails from buyer at her address and even positive feedback for the transaction.
Yet, paypal still took my money for 6 months before deciding I had no case!!
So maybe my idea above would also fail. Paypal/Ebay look very dimly on crypto trades, although they seem happy enough to take the trading fees.