<...> and we can change the protocol to go deeper if necessary in the future. <...>
1. Yes, with a fairly simple modification of the protocol we can allow bitcoins to be divided to smaller parts.
It is great! i worried much time about this.
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Difficulty is adjusted by agreement on the network.
Thanks for answer.Difficulty is regulated automatically by the network via an algorithm.
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"I've corrected most of the English mistakes"
Thank you for this. I will try to prevent repeating that mistakes.