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Japan has a significant adoption of BTC. But ultimately the fuel for BTC will most likely be the interest in other projects as the majority of coins are traded against BTC. I think a lot of the newer coins are taking adoption a bit more seriously than BTC right now as BTC has been focusing on upgrading tech rather than adoption mechansims. As more coins adopt fiat/coin pairings BTC will start to stumble but until then I am bullish long term.

Any certainty, even if it means strict world wide regulation from G20, would be a boost. Uncertainty drives the weak out of this market.