Bitcoin transactions can go down to 0.00000001 BTC. They aren't however stored as floats due to rounding errors this can introduce (https://bitcointalk.org/ind

Bitcoin transactions can go down to 0.00000001 BTC. They aren't however stored as floats due to rounding errors this can introduce (https://bitcointalk.org/index.php?topic=13837.0 https://bitcointalk.org/index.php?topic=13837.0).