Tracks down when a Minecraft account was created.
Mojang has an API endpoint for usernames:
https://api.mojang.com/users/profiles/minecraft/<name>?at=<timestamp>
It can be used to find the UUID of an account, by username it used at the given time.
It returns either 200 OK or 204 No Content – indicating that the username was not in use at the time.
A few hours ago, the automated email system for Code Jam went a little bit crazy. I'll write about the technical details below, but the short version is that it sent an email titled "Registration Now Open for Google Code Jam 2014!" more than 20 times to a large number of registrants from 2013. You're receiving this email because our systems indicate that you're one of them.
I'm writing this to apologize: we didn't intend to send anyone more than one email, but a bug crept in to a refactoring of our mail system and ruined those plans. On behalf of the Code Jam team and Google, I'm sorry; we'll work hard to make sure this doesn't happen again. Later in this email, I've included answers to some questions you might have. If you'd like to talk about this further, please send us an email at [email protected].
Sincerely, Bartholomew Furrow, on behalf of the Code Jam team.
We sent the notification email to users who registered for Code Jam 2013, checked the box saying
I hereby claim:
To claim this, I am signing this object: