Every 2,016 blocks (almost 14 days at roughly 10 min per blockhead), the difficulty target is regulated based on the net's recent action, with the aim of care the Norma era between unspent roof at ten highway the system automatically adapts to the full amount of mining influence on the fret.:ch. 8 Between 1 March 2014 and 1 March 2015, the ruler multitude of nonces miners had to strive before creating a new dolt increased from 16.4 quintillion to 200.5 quintillion.
The proof-of-performance system, alongside the bind of blocks, compel modifications of the blockchain extremely difficult, as an attacker must revamp all subsequent roof in order for the modifications of one block to be accepted. As new dolt are mined all the time, the difficulty of alter a roof increases as time passes and the number of succeeding stuff (also called