If you wait long enough, say, for 144 confirmations (or 24 hours, whichever is greater) then a double spend may as well be the least of your worries, for bitcoin, or any of the top mined crypto-currencies.
These double-spend attacks are only successful if the receiving party doesn't wait long enough.
Also, could't find any sources from exchanges if they were actually successful? The article didn't mention which exchanges.
Quote:
"Blockchain data indicates that the attacker successfully reversed transactions as far back as 22 blocks, leading developers to advise raising confirmation requirements to 50 blocks."
So as long as exchanges wait 50 blocks before crediting, they should be all right.
These double-spend attacks are only successful if the receiving party doesn't wait long enough.
Also, could't find any sources from exchanges if they were actually successful? The article didn't mention which exchanges.
Quote:
"Blockchain data indicates that the attacker successfully reversed transactions as far back as 22 blocks, leading developers to advise raising confirmation requirements to 50 blocks."
So as long as exchanges wait 50 blocks before crediting, they should be all right.