I have just posted a statement on our development blog regarding the events that took place this weekend, please give it a read through to know what took place and what is being done moving forward.
New wallets to be released tomorrow.

https://developer.gulden.com/blog/

You guys are simply amazing , what a rapid response! Absolute 100% Respect to all those involved in the development team!

Hey pijpenstelen,

These types of attacks wouldn't cause issues with your personal funds in your wallet. It mainly affects exchanges and vendors/merchants if targeted. We will be releasing our interim solution sometime today after further testing.
The testing also included doing multiple 51% attacks on our test network and the results have been excellent.

What's the frequency of the auto-checkpointing? Wouldn't there be time for an attack between checkpoints? Are you planning to just rollback transactions to the previous checkpoint if there's another attack?

It seems very unlikely that the attacker(s) would bother with NLG again, since afaik the only exchange is Bittrex, and you can bet they're going to keep a close eye on it, but it seems a bit disingenuous to say that you have solved double spending. The only way to prevent 51% attacks and double spending is to make the coin more centralized, which seems to be what is being done, that you kind of acknowledge with statements like "We will be releasing our interim solution...", where 'interim' implies it is a quick fix that will be removed later. I mean, if you truly solved double spending without centralizing the coin, you'd get the Nobel prize for crypto or something, right?

Since the dev team knows how to do 51% attacks will you retaliate against other coins if we get attacked again ?

The development team would never consider this even if it happened to be a specific coin behind the attacks because there will be innocent investors buying into that coin that wouldn't deserve it and we want to keep a clean slate with Gulden where no one can point fingers at us for doing something wrong to ruin the repuation of Gulden. We have to take the higher ground here and make our
blockchain bulletproof while building up Gulden with the help of our great community!

I don't do that sort of thing, if I did I would already be retired on an island somewhere plenty of coins out there with easy to target giant vulnerabilities in them.
We are here to build things not tear them down.

While that may very well be true, without evidence I don't think anyone should be pointing fingers anywhere, if anyone has any evidence please feel free to come forward.


Yes, we don't consider it a good long term solution for Gulden, I'm not going to go into any more specifics than that, you can probably find some details earlier in this thread or on our official forums if you are interested.

New wallets are in the process of being built, it takes a few hours so likely tomorrow morning.

It is the way you word things that makes all the difference, if you actually want people to take the time to give a serious response to you then I strongly suggest you go back and look at how you have worded your last message and do the complete opposite in future.
As for our medium and long term solutions, we will release more on that when we are ready, there is no point discussing it before then.