A left field speculation of mine: are we sure Bitcoin isn't Japanese? I know there's circumstantial evidence against Satoshi being Japanese, or even being a sin

A left field speculation of mine: are we sure Bitcoin isn't Japanese? I know there's circumstantial evidence against Satoshi being Japanese, or even being a single person, but considering Japan's economic malaise it seems possible that they would consider bizarre experiments. MtGox, the largest exchange, is also Japanese (or started there).