See also: target Contents 1 2 3 4 5 6 7 8 9 Difficulty is a measure of how difficult it is to find a hash below a given target.The Bitcoin network has a global block difficulty.Valid blocks must have a hash below this target.Mining pools also have a pool-specific share difficulty setting a lower limit for shares.difficulty = difficulty_1_target / current_target (target is a 256 bit number) difficulty_1_target can be different for various ways to measure difficulty.Traditionally, it represents a hash where the leading 32 bits are zero and the rest are one (this is known as "pool difficulty" or "pdiff").The Bitcoin protocol represents targets as a custom floating point type with limited precision; as a result, Bitcoin clients often approximate difficulty based on this (this is known as "bdiff").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 0x1b0404cb, the hexadecimal target is Note that the 0x0404cb 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 0x008000 is the smallest positive valid value.The highest possible target (difficulty 1) is defined as 0x1d00ffff, which gives us a hex target of It should be noted that pooled mining often uses non-truncated targets, which puts "pool difficulty 1" at So the difficulty at 0x1b0404cb is therefore: And: Here's a fast way to calculate bitcoin difficulty.gerar bitcoinIt uses a modified Taylor series for the logarithm (you can see tutorials on flipcode and wikipedia) and relies on logs to transform the difficulty calculation: To see the math to go from the normal difficulty calculations (which require large big ints bigger than the space in any normal integer) to the calculation above, here's some python: Current difficulty, as output by Bitcoin's getDifficulty.ethereum mac mining

Graphs There is no minimum target.The maximum difficulty is roughly: maximum_target / 1 (since 0 would result in infinity), which is a ridiculously huge number (about 2^224).The actual maximum difficulty is when current_target=0, but we would not be able to calculate the difficulty if that happened.(fortunately it never will, so we're ok.)mybb bitcoinSee discussion in target.bitcoin company isle of manThe minimum difficulty, when the target is at the maximum allowed value, is 1.bitcoin atm israelThe difficulty is adjusted every 2016 blocks based on the time it took to find the previous 2016 blocks.bitcoin average payoutAt the desired rate of one block each 10 minutes, 2016 blocks would take exactly two weeks to find.deposit bitcoin coinbase

If the previous 2016 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 2016 blocks took to find.To find a block, the hash must be less than the target.bitcoin moneda globalThe hash is effectively a random number between 0 and 2**256-1.bitcoin powThe offset for difficulty 1 is and for difficulty D is The expected number of hashes we need to calculate to find a block with difficulty D is therefore or just The difficulty is set such that the previous 2016 blocks would have been found at the rate of one every 10 minutes, so we were calculating (D * 2**48 / 0xffff) hashes in 600 seconds.That means the hash rate of the network was over the previous 2016 blocks.

Can be further simplified to without much loss of accuracy.At difficulty 1, that is around 7 Mhashes per second.At the time of writing, the difficulty is 22012.4941572, which means that over the previous set of 2016 blocks found the average network hash rate was (The eternal question.)The average time to find a block can be approximated by calculating: where difficulty is the current difficulty, hashrate is the number of hashes your miner calculates per second, 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 20000: and find that it takes just under 24 hours on average.Any one grinding of the hash stands the same chance of "winning" as any other.The numbers game is how many attempts your hardware can make per second.You need to know the difficulty (above) and your khash/sec rate (reported by the client).Mining Hardware Comparison has some stats that may help you predict what you could get.

Visit a calculator or perform the maths yourself, /bitcoin/calculator.php /bitcoincalculator.php /calculator /bitcoin-mining-calculator Remember it's just probability!There are no guarantees you will win every N days.Bitcoin Difficulty History What is Bitcoin Mining Difficulty?Difficulty: Bitcoin Difficulty: 711,697,198,174 Estimated Next Difficulty: Adjust time: Hashrate(?): 5,065,947,269 GH/s Block Generation Time(?): Updated: Chart Explained The difficulty.The estimated next difficulty.Average block generation time of 2016 blocks.Block generation time is also known as confirmation time.Average block generation time of 1008 blocks.If grey line less than blue line, The generation time is decreasing.The more grey line is lower than blue line, the faster generation time is decreasing.After 2016 blocks generated, Bitcoin will adjust difficulty to estimated difficulty in order to keep the block generation time at 600 seconds.

Difficulty History Date Difficulty Change Hash Rate Jun 17 2017 711,697,198,174 5,094,526,985 GH/s Jun 04 2017 678,760,110,083 4,858,754,124 GH/s May 23 2017 595,921,917,085 4,265,775,241 GH/s May 10 2017 559,970,892,891 4,008,427,786 GH/s Apr 27 2017 521,974,519,554 3,736,439,151 GH/s Apr 13 2017 520,808,749,422 3,728,094,244 GH/s Mar 30 2017 499,635,929,817 3,576,533,297 GH/s Mar 17 2017 475,705,205,062 3,405,230,497 GH/s Mar 03 2017 460,769,358,091 3,298,315,540 GH/s Feb 18 2017 440,779,902,287 3,155,225,442 GH/s Feb 04 2017 422,170,566,884 3,022,014,630 GH/s Jan 22 2017 392,963,262,344 2,812,940,600 GH/s Jan 10 2017 336,899,932,796 2,411,623,656 GH/s Dec 28 2016 317,688,400,354 2,274,102,150 GH/s Dec 15 2016 310,153,855,703 2,220,167,778 GH/s Dec 02 2016 286,765,766,821 2,052,749,317 GH/s Nov 18 2016 281,800,917,193 2,017,209,539 GH/s Nov 05 2016 254,620,187,304 1,822,642,296 GH/s Oct 22 2016 253,618,246,641 1,815,470,125 GH/s Oct 08 2016 258,522,748,405 1,850,577,916 GH/s Sep 25 2016 241,227,200,230 1,726,771,560 GH/s Sep 12 2016 225,832,872,179 1,616,574,667 GH/s Aug 29 2016 220,755,908,330 1,580,232,344 GH/s Aug 15 2016 217,375,482,757 1,556,034,316 GH/s Aug 02 2016 201,893,210,853 1,445,207,896 GH/s Jul 18 2016 213,492,501,108 1,528,238,850 GH/s Jul 04 2016 213,398,925,331 1,527,569,009 GH/s Jun 21 2016 209,453,158,595 1,499,324,110 GH/s Jun 08 2016 196,061,423,940 1,403,462,340 GH/s May 24 2016 199,312,067,531 1,426,731,353 GH/s May 11 2016 194,254,820,283 1,390,530,167 GH/s Apr 28 2016 178,659,257,773 1,278,892,782 GH/s Apr 14 2016 178,678,307,672 1,279,029,147 GH/s Apr 01 2016 166,851,513,283 1,194,369,655 GH/s Mar 18 2016 165,496,835,118 1,184,672,491 GH/s Mar 04 2016 158,427,203,767 1,134,066,098 GH/s Feb 19 2016 163,491,654,909 1,170,318,852 GH/s Feb 07 2016 144,116,447,847 1,031,625,717 GH/s Jan 26 2016 120,033,340,651 859,232,121 GH/s Jan 13 2016 113,354,299,801 811,421,684 GH/s Dec 31 2015 103,880,340,815 743,604,444 GH/s Dec 18 2015 93,448,670,796 668,931,642 GH/s Dec 06 2015 79,102,380,900 566,236,898 GH/s Nov 24 2015 72,722,780,643 520,569,941 GH/s Nov 11 2015 65,848,255,180 471,360,171 GH/s Oct 29 2015 62,253,982,450 445,631,364 GH/s Oct 15 2015 60,883,825,480 435,823,399 GH/s Oct 01 2015 60,813,224,039 435,318,014 GH/s Sep 17 2015 59,335,351,234 424,738,988 GH/s