You guys really need to learn your Bitcoin history! Bitcoin had been rolledback!
8th August 2010 - 92 billion BTC into existence
On 8th August 2010 bitcoin developer Jeff Garzik wrote what could be mildly described as the biggest understatement since Apollo 13 told Houston: “We’ve had a problem here.”. “The ‘value out’ in this block is quite strange,” he wrote on bitcointalk.org, referring to a block that had somehow contained 92 billion BTC, which is precisely 91,979,000,000 more bitcoin than is ever supposed to exist. CVE-2010-5139 (CVE meaning ‘common vulnerability and exposures’) was frighteningly simple and exploited to the point of farce by an unknown attacker. In technical language, the bug is known as a number overflow error.So instead of the system counting up 98, 99, 100, 101, for example, it broke at 99 and went to zero (or -100) instead of 100. In layman’s terms, someone found a way to flood the code and create a ridiculously large amount of bitcoin in the process.
The fix was the bitcoin equivalent of dying in a video game and restarting from the last save point. The community simply hit ‘undo’, jumping back to the point in the blockchain before the hack occurred and starting anew from there; all of the transactions made after the bug was exploited – but before the fix was implemented – were effectively cancelled.
How serious was it? Bitcoin’s lead developer Wladimir Van Der Laan is pretty blunt about it, telling me: “It was the worst problem ever.”
Source1:
http://www.coindesk.com/9-biggest-screwups-bitcoin-history/Source2:
https://bitcointalksearch.org/topic/strange-block-74638-822This is a hard-fork for internal reasons, not a blockchain rollback for external reasons - HUGE difference. It was done because the protocol wasn't implemented properly, not because some third-party exchange messed up.
Obviously you need to learn your terminology...
Bitcoin used a hard-fork, which caused that block to be invalid and unacceptable (because it was)... Nothing was invalid or unacceptable (protocol-wise) about the block that VRC rolled back to.
There are hard-forks, forks, and blockchain rollbacks (essentially, large blockchain re-organizations).
Hard-forks are performed because there is a bug in the software that needs fixing - a fault in the software itself.
Bitcoin has had a few emergency hard-forks; 2 to be exact. These are positive changes - they show that the developers and community are on top of things, and capable of fixing the protocol or protocol implementation when necessary.
Forks are when there are two competing blockchains - this is usually a bad thing. Simple forks are often caused when there are protocol version conflicts, and the longer chain stops getting accepted by a set of nodes, who then branch into their own chain. Forks are almost always a bad thing.
Blockchain rollbacks and re-orgs happen when someone 51% attacks the network, or for the first time with VRC, when devs decide to force a revert to a previous checkpoint. Blockchain re-organizations (rollbacks) are VERY BAD. They show that the network has NO orphan security, and that you very simply should not trust your money on that blockchain.
A fork is not a fork. Anyone that says that has no idea what they are talking about, and you probably shouldn't believe anything else they clai
And, FFS... the big and red text doesn't make your point more valid - it just makes you look desperate.