Difficulty
Difficulty is a measure of how hard it is to find a valid block in a proof-of-work blockchain. It adjusts to the computing power on the network so that blocks keep arriving at a steady pace.
What difficulty measures
To mine a block, a miner must find a block header hash below a target number. The lower the target, the fewer hashes qualify and the more attempts are needed on average. Difficulty expresses this target as a relative number: how many times harder it is to find a block now than at the easiest level allowed by the protocol.
How Bitcoin adjusts it
Bitcoin aims for one block about every ten minutes. Every 2,016 blocks, roughly two weeks, every node compares how long those blocks actually took with the expected two weeks. If blocks came too fast because more computing power joined, difficulty rises; if they came too slowly, it falls. A single adjustment is limited to a factor of four in either direction.
This mechanism keeps Bitcoin's issuance schedule on track even as total computing power, called hashrate, has grown enormously since 2009. Many other proof-of-work chains adjust difficulty more often, some after every block.
An example
Suppose hashrate jumps 10 percent during an adjustment period. Blocks then arrive in about nine minutes on average instead of ten. At the next adjustment, difficulty rises by roughly 10 percent, bringing block times back toward ten minutes. If many miners switched off, for example after a halving or an energy price spike, the reverse would happen.
Why it matters
Difficulty is a key cost factor for miners: when it rises, each machine earns fewer coins for the same electricity. Some analysts watch difficulty and hashrate as indicators of miner health and network security. Rising difficulty means more work protects the chain, though it says little on its own about where prices are heading.
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Frequently asked questions
How often does Bitcoin's difficulty change?
Every 2,016 blocks, which works out to about every two weeks, depending on how fast blocks were actually found.
What is the difference between difficulty and hashrate?
Hashrate is the total computing power miners are applying. Difficulty is the target the protocol sets in response, so that blocks keep arriving about every ten minutes.
Does higher difficulty make bitcoin more valuable?
Not directly. It reflects more mining activity and higher security costs, but price is set by supply and demand in the market.
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