it's very possible, but i'd imagine that it would have been found by now. a bunch of hackers have examined the code and none have found these weaknesses. it's always possible they all missed something, though
i'll put it this way. this is the currency of hackers. they wouldn't be messing with it if the code was exploitable within their means, because they'd be putting their "stash" at risk, too. see what i mean?
Most of these comments about bitcoin being hacked come from a fundamental misunderstanding of the entire system.
Bitcoin is simply a transaction ledger (aka the blockchain).
To make a transaction, a person uses a cryptographic key to "sign" a transaction, which verifies it is them.
This cryptographic technology is extremely strong, and is used very widely in many industries and governments throughout the world. Ever used a credit card? Then you've used the same kind of technology.
And then, what people fail to understand or accept (despite me posting this a hundred times already) is that bitcoin can be changed, and has been. But it only results in a fork of the blockchain. If a person creates a new blockchain and no one else values it, then it's worthless.
This post was edited on 3/29 at 9:48 pm