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with the amount of btc you want to spend, I guess only siacoin would be viable. siacoin was going crazy last couple days. I sold out at 580 satoshis two days ago now it is over 800 satoshis ( 2 pennies). I would wait for it to go back to 600-650 satoshis then buy and forget.

Okay, I haven't check other coins yet, but siacoin looks okay.

where I can buy them? on which platform?

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