An anonymous reader writes from a report via Softpedia: A listing was published today on TheRealDeal Dark Web marketplace claiming to be offering data on over 200 million Yahoo users, sold by the same hacker that was behind the LinkedIn, Tumblr, MySpace, and VK data dumps. In statements to Softpedia, Yahoo said it was investigating the breach, but based on the seller's reputation, it is very likely the data is authentic. The data is up for sale for 3 Bitcoin (approximately ~$1,800), and based on the sample the hacker provided, the data dump includes details such as usernames, MD5-hashed passwords, and dates of birth for all users. For some records, there is also a backup email address, country of origin, and ZIP code for U.S. users. The hacker, called Peace, has also told Softpedia that he previously made $50,000 from the LinkedIn breach alone, and over $65,000 in total from all breaches.