I just got 0.048049 BTC lost/stolen because I entered my private keys online trying to sign transactions to spend 0.1999 BTC I had stuck in a 3-of-3 multi-sig address. I managed to receive only
I am trying to find out how this happened since I never shared my private keys with anyone other than Coinb.in
Could this have been some coding issue and maybe coinb.in can send my coins back to me?
I sent an elaborate email to Support with all the steps I did including my signed transactions and some error message "18: txn-mempool-conflict" that I got while broadcasting the 3 signed transactions.
Hopefully, they can provide a solution, otherwise, I would strongly recommend that everyone stays away from this site or use only a downloaded offline version if they need to sign transactions with their private keys.
I am using a MacBook Pro and have no malware or viruses that I know of.
Now I am trying to figure out if I can save any of the rest forked coins (since November 2015) before the perpetrator does the same with them.