Ruby on Rails
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BlockDiary is a a private, unchangeable and indestructible journal. It's perfect for journalists, scientists and whistleblowers, who must be able to prove that they knew a piece of information before it was publicly available. It's also useful to individuals and publications that want to establish a historical record immune to revisionist history and censorship by hostile governments or corporations. Users send individual entries to our email server, which then initiates a set of Bitcoin transactions via BlockChain.info bearing a hash of the user's email address, email subject line, and email text (the journal entry) in the metadata. Eventually, users will be able to run their own version off our open source code. Users receive a confirmation email with a private link to view the full entry text, and its time stamp. On each full entry page, all of their past entries will be logged (by subject line and time stamp only). This is a very important feature because it will keep users from making zillions of "records" and only revealing the select few that turned out to be correct (a "publication bias attack"). You won't have to reveal the full text of all your past entries but you'll have to acknowledge the full scope of the journal you've created.