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Bitcoin – what happened yesterday in Japan?

I'm a developer of the Bitcoin Tracker iPad app (http://www.alstertouch.com/bitcoinapp/) and I just noticed a big spike in yesterday's downloads from Japan. Does anyone have any clue what happened over there?
( 2 comments | on HN )
Re:Bitcoin – what happened yesterday in Japan? by mschuster91 on Wednesday January 22, 2014 @07:05AM (#7102094)
There's been some dude broadcasting a BTC transaction out of North Korea... but I don't believe this would cause a spark of interest in Japan.
Re:Bitcoin – what happened yesterday in Japan? by nanofortnight on Wednesday January 22, 2014 @06:58AM (#7102075)
Not sure it's related but I know the Bitcoin Tokyo Meetup Group has a meeting tomorrow.