Dificulty Target

• As more miners (nodes) join the network the more difficult it is to solve thepuzzle, and vice versa.

• Difficulty level adjusts every approximately 2 weeks or 2016 blocks, to make sure,it takes 10 minutes to create a block.

• Difficulty is set by is set by the protocol. [link]

• As the difficulty increases, so the target value for the hash decreases. This means there have to be more zeros at the start of the hash number.