Cryptocurrency Mining Crypto mining information for Bitcoin, Etheruem, Litecoin, Monero, Zcash, and + more. Select a cryptocurrency for more information about mining. The current Bitcoin hashrate is EH/s, representing the global Bitcoin network hashrate with a mining difficulty of T at block height , View the Bitcoin hashrate chart for all time historical hashrates. The difficulty is a measure of how difficult it is to mine a Bitcoin block, or in more technical terms, to find a hash below a given target. A high difficulty means that it will take more computing power to mine the same number of blocks, making the network more secure against attacks.
Difficulty bitcoinWhat is Difficulty in Bitcoin?
But just remember that both these decimal and hexadecimal numbers have the same value , and you can easily convert between the two. Awkwardly, the difficulty is usually given in decimal format, whereas the hashes and targets are stored in hexadecimal. I used this hexadecimal to decimal converter to do this. Plus the presence of letters within the value is a dead giveaway anyway. So when the miner was trying to solve block ,, she wanted to get a hash for her candidate block that would be below Oh yeah, the hash is in hexadecimal format.
Let me convert from hexadecimal to decimal again so that we can compare the two numbers:. Yep, that hash is a smidgin smaller than the target. But it is lower, so the hash is successful and the block can be added to the blockchain. You can find the current difficulty by entering the getdifficulty command in to your bitcoin client:.
The difficulty can also be found with getmininginfo amongst other mining info. I'll let you know about cool website updates , or if something seriously interesting happens in bitcoin.
Don't worry, it doesn't happen very often. What is the difficulty? Why is the difficulty important? When does the difficulty change? The difficulty adjusts every blocks roughly every 2 weeks. If the number is less than 1 i. How does the difficulty control time between blocks? Bitcoin example. And due to the fact that there are now thousands of miners trying to find winning numbers, to ensure that a winning number is found every 10 minutes instead of every few seconds , the range of successful numbers ends up being absolutely tiny: Even though that difficulty number looks big, the target is still absurdly difficult to get under.
Introducing hexadecimal numbers… Because these target numbers are so big, computers prefer to work with them in hexadecimal format. 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 0x1bcb stored in little-endian order: cb 04 04 1b , the hexadecimal target is. Note that this packed format contains a sign bit in the 24th bit, and for example the negation of the above target would be 0x1b 8 cb in packed format. Since targets are never negative in practice, however, this means the largest legal value for the lower 24 bits is 0x7fffff.
Additionally, 0x is the smallest legal value for the lower 24 bits since targets are always stored with the lowest possible exponent. 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. Here's a fast way to calculate bitcoin difficulty. 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. There is no minimum 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 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.