Network DifficultyA relative measure of how difficult it is to mine a new block for the blockchain.
More about this chart
Explanation
The difficulty is a measure of how difficult it is to mine a Bitcoin block, or in more technical terms, to find a hash below a given target. A high difficulty means that it will take more computing power to mine the same number of blocks, making the network more secure against attacks. The difficulty adjustment is directly related to the total estimated mining power estimated in the Total Hash Rate (TH/s) chart.
Notes
The difficulty is adjusted every 2016 blocks (every 2 weeks approximately) so that the average time between each block remains 10 minutes.
Methodology
The difficulty comes directly from the confirmed blocks data in the Bitcoin network.

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