Quote from: RawDog on February 22, 2017, 06:23:14 PM

Say goodbye to that money. Gone. Sorry about the bad luck.

This is how double spend works. They set up a transaction (first spend), then when it falls as unsuccessful, they spend the same money on a different address/transaction (second spend).

The first transaction 'didn't happen' like the guy said above. Therefore, you are out of your money and fucked.

Bitcoin is very complex. Most people just get robbed and then quit. Please be careful. Anyone can just log in to your computer and get all your savings in an instant.

True, it's quite complicated, up until now the only thing I know is how to send and receive money on my online wallet. Still confused with the technical stuff. Does this mean he wouldn't get his money back? That would suck Angry

Do you think this is possible to avoid? I'm currently learning stuff like Photoshop and later I'll take some CAD seminar. Planning to freelance IRL and probably also advertise my service OL in this forum. This incident made me uneasy. What if I already sent them the finished project and then the payment I received ended up like OP's transaction? If the client is like half-way accross the globe, obviously I wouldn't be able to sue to them (or at least show up outside their office to pester them to give me my payment) Sad

Quote from: roomi34 on February 22, 2017, 04:34:16 PM

Hello friends i am much worried ...
2 days ago one exchanger send me btc but still not confirmed.Few minutes ago my transaction had reversed back to exchanger account.
what is a double spending attack or not?
and how payment reversed.and now a time double spending attack is possible?

I'm curious OP, what did the exchanger sent you coins for? Is it like profit from money you deposited or you're taking back money you deposited? Well, you don't have to answer it, I'm curious how you got into this arrangement.