For those who are wondering, I went to Bitcointalk.org and I got word that BTC-Stack has been attack. This is what the admin of BTC-Stack said:
Hello.
We got this message:
"Your site is going under DDoS attack.
Pay 1 BTC, attack will stop, and you are free for lifetime of your program."
and this:
"Hello, To introduce myself first: http://blogs.akamai.com/2014/12/dd4bc-anatomy-of-a-bi.. http://bitcoinbountyhunter.com/bitalo.htmlhttp://cointelegraph.com/news/113499/notorious-hacker.. Or just google “DD4BC” and you will find more info. So, it’s your turn. Your site is going under DDoS attack. Pay 1 BTC, attack will stop, and you are free for lifetime of your program. Waiting for your payment @ 1tsmDsrkmjuEyfoL9X43zXHFdR2ipRj91"
We will keep you informed of developments
I will report further more info.