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Difficulty is a measure of how difficult it is to find a new block. It is a human-friendly way of expressing the target.
Each block stores a packed representation called "Bits" for its actual hexadecimal target. The target can be derived from it via a predefined formula. For example, if the packed target in the block is 0x1bcb, the hexadecimal target is. Note that the 0xcb value is a signed value in this format. The largest legal value for this field is 0x7fffff. To make a larger value you must shift it down one full byte. Also 0x is the smallest positive valid value. Difficulty 1 which is not the lowest difficulty corresponds to 0x1d00ffff, which gives us a hex target of.
There is no minimum target. The maximum difficulty is roughly: See discussion in target. The difficulty is adjusted every blocks based on the time it took to find the previous blocks. At the desired rate of one block every 2. If the previous blocks took more than 3. If they took less than 3. The change in difficulty is in proportion to the amount of time over or under 3.
To find a block, the scrypt hash must be less than the target. The offset for difficulty 1 is. The expected number of hashes we need to calculate to find a block with difficulty D is therefore. The difficulty is set such that the previous blocks would have been found at the rate of one every 2. That means the hash rate of the network was. At the time of writing, the difficulty is Retrieved from " https: Navigation menu Personal tools Log in Request account. Views Read View source View history.
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