Scherzi a parte, ho guardato il grafico, ma io vedo soltanto che la difficoltà aumenta col passare del tempo. Quindi servono macchine con piu potenza. In che senso si regola automaticamente? Non tutti potranno permettersi macchine cosi potenti e già ora è dura...
La difficoltà può anche calare. Dipende da alcuni fattori descritti in questo link
https://en.bitcoin.it/wiki/Difficulty
Come ad esempio:
Quote
What network hash rate results in a given difficulty?
The difficulty is adjusted every 2016 blocks based on the time it took to find the previous 2016 blocks. At the desired rate of one block each 10 minutes, 2016 blocks would take exactly two weeks to find. If the previous 2016 blocks took more than two weeks to find, the difficulty is reduced. If they took less than two weeks, the difficulty is increased. The change in difficulty is in proportion to the amount of time over or under two weeks the previous 2016 blocks took to find.
The difficulty is adjusted every 2016 blocks based on the time it took to find the previous 2016 blocks. At the desired rate of one block each 10 minutes, 2016 blocks would take exactly two weeks to find. If the previous 2016 blocks took more than two weeks to find, the difficulty is reduced. If they took less than two weeks, the difficulty is increased. The change in difficulty is in proportion to the amount of time over or under two weeks the previous 2016 blocks took to find.
