To provide insite to this thread, I will add that the transaction was sent from a coinomi wallet, and if I am correct, they use shapeshift.
How did this happen exactly? Was it someone at your house, showing you his wallet? I've heard about fake banking apps (in the Netherlands), used to pretend to pay someone when buying goods. A fake Bitcoin app would be new to me.
This transaction looked perfectly normal especially right after it was transmitted, because the negative balance did not show up until the next day!!!
The negative balance on blockchain.info only happened when they made the second payment (the
real payment).
One would have assumed that this would have eventually confirmed, but it was never going to!!!
With the current high fees I wouldn't assume it confirms before it's dropped from mempool. I have an outgoing unconfirmed transaction for 3 days now, I'm curious to see if it gets dropped (in which case I'll rebroadcast it) or that it just stays unconfirmed until it confirms.