Notice: Pyrk v0.13.0 is the Latest Version (11/Sept/2020). [Upgrade] - You should upgrade as soon as possible
Mining difficulty adjusts automatically every block for each algorithm.
The adjustment aims to maintain an average block-mining time of 1.5 minutes.
A growth in the difficulty indicates that the average block-mining time during the previous adjustment epoch was less than 1.5 minutes (due to more miners joining the network and 'searching' / 'mining' for blocks).
A drop in difficulty indicates miners have left the network so finding each block is adjusted to be 'easier' for the smaller number remaining.