_ Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top up vote 4 down vote favorite 3 Irrespective of the length of time required to calculate one hash, how many hash operations are required to produce one Bitcoin?mining-theory hash mining-reward hashpower sha256 up vote 7 down vote These charts show the approximate network hash rate on the left axis: http://bitcoin.sipa.be/ We know the network adjusts for 25 new bitcoins per 10 minutes.Together this provides enough info to give an approximate answer to your question: hashes per bitcoin = (network hash rate) / (25 BTC per 10 minutes) = (180 * Th / s) / (25 * BTC / (600 * s) ) = 180 * 600 / 25 * Th / s / BTC * s = 2,700 Th / BTC = 2,700,000,000,000,000 h/BTC up vote 1 down vote /calculators/finance/bitcoin-mining/ up vote 0 down vote Difficulty changes regularly, but there are calculators that take all current factors into account: /mining/calculator/btc?HashingPower=15&HashingUnit=TH%2Fs&PowerConsumption=0&CostPerkWh=0 As of today (17 Jan 2017): a theoretical 1,581 TH/s (equivalent of running a hundred Antminer S9's) will return 1 BTC in a day.

Tomorrow, it will be different.Browse other questions tagged mining-theory hash mining-reward hashpower sha256 or ask your own question.404 Page Not Found.Ooops, the page you're looking for does not exist.Hashrate Distribution An estimation of hashrate distribution amongst the largest mining pools The graph below shows the market share of the most popular bitcoin mining pools.It should only be used as a rough estimate and for various reasons will not be 100% accurate.A large portion of Unknown blocks does not mean an attack on the network, it simply means we have been unable to determine the origin.24 hours - 48 hours - 4 Days Known Blocks.Relayed By count Unknown Blocks.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").bitcoin logo svgThe 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").magic pool bitcoinEach block stores a packed representation (called "Bits") for its actual hexadecimal target.litecoin mining with gpuThe target can be derived from it via a predefined formula.gry online bitcoin

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.bitcoin satoshi euroTo make a larger value you must shift it down one full byte.bitcoin core catching upAlso 0x008000 is the smallest positive valid value.bitcoin ticker widgetThe 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.bitcoin mining alone vs pool

It 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 failGraphs 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.)See discussion in target.The minimum difficulty, when the target is at the maximum allowed value, is 1.The difficulty is adjusted every 2016 blocks based on the time it took to find the previous 2016 blocks.

At the desired rate of one block each 10 minutes, 2016 blocks would take exactly two weeks to find.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.The hash is effectively a random number between 0 and 2**256-1.The 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!