avatar2021-03-29T10:58:02+01:00

# Bitcoin mining difficulty charts

The minimum difficulty, when the target is at the maximum allowed value, is 1.

### What network hash rate results in a given difficulty?

The difficulty is adjusted every blocks based on the time it took to find the previous blocks. At the desired rate of one block each 10 minutes, blocks would take exactly two weeks to find. If the previous blocks took more than two weeks to find, the difficulty is reduced. If they took less than two weeks, the difficulty is increased. The change in difficulty is in proportion to the amount of time over or under two weeks the previous blocks took to find.

To find a block, the hash must be less than the target. The hash is effectively a random number between 0 and 2** The offset for difficulty 1 is

0xffff * 2**

and for difficulty Moneycontrol bitcoin india is

(0xffff * 2**)/D

The expected number of hashes we need to calculate to find a block with difficulty D is therefore

D * 2** / (0xffff * 2**)

or just

D * 2**48 / 0xffff

The difficulty is set such that the previous blocks would have been found at the rate of one every 10 minutes, so we were calculating (D * 2**48 / 0xffff) hashes in seconds. That means the hash rate of the network was

D * 2**48 / 0xffff /

over the previous blocks. Can be further simplified to

D * 2**32 /

without much loss of accuracy, bitcoin mining difficulty charts.

At difficulty 1, that is around 7 Mhashes per second.

At the time of writing, bitcoin mining difficulty charts, the difficulty iswhich means that over the previous set of blocks found the average network hash rate was

* 2**32 / = around Ghashes per second.

### How soon might I expect to generate a block?

(The eternal question.) best uk bitcoin account average time to find a block can be approximated by calculating:

time = difficulty * 2**32 / hashrate

where difficulty is the current difficulty, hashrate is the number of hashes your miner calculates per second, bitcoin mining difficulty charts, and time is the average in seconds between the blocks you find.

For example, using Python we calculate the average time to generate a block using a 1Ghash/s mining rig when the difficulty is

\$ python -c "print * 2**32 / 10**9 / 60 / "

and find that it takes just under 24 hours on average.

### Why is bitcoin not designed to update the difficulty more frequently?

Discussion: unioninvestb.com?context=5