Hashrate
Hashrate is the total computing power miners devote to a proof-of-work blockchain, measured as the number of hash guesses made per second across the whole network.
What miners are actually doing
To add a block, a miner repeatedly runs the block's data through a hash function, a one-way calculation that turns any input into a fixed-length fingerprint. Each attempt changes a small number called the nonce. A block is valid only if its hash falls below a target set by the network, so finding one is pure trial and error.
Hashrate counts those attempts. One hash per second is tiny; Bitcoin's network is measured in exahashes per second, where one exahash is a quintillion (10 to the power of 18) guesses.
How it is measured
Nobody can count every miner's guesses directly. Instead, hashrate is estimated from how quickly blocks are being found at the current difficulty. Because block discovery is random, short-term estimates are noisy, so charts usually show averages over several days.
Bitcoin adjusts its difficulty every 2,016 blocks so that blocks keep arriving roughly every ten minutes. When hashrate rises, difficulty follows, and vice versa.
Why it matters
Hashrate is a rough measure of security. To rewrite recent history, an attacker would need more hashing power than all honest miners combined, which is the idea behind a 51% attack. The higher the network hashrate, the more hardware and electricity such an attack would require.
It also reflects miner economics. Hashrate tends to grow when mining is profitable and can drop when rewards fall or energy costs rise, for example after a halving or when a region bans mining.
Common misreadings
A rising hashrate is not a price signal. Miners react to price, rewards and hardware cycles, and the link to market moves is loose. Also, comparing hashrates between different coins only makes sense when they use the same hashing algorithm.
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Frequently asked questions
What unit is hashrate measured in?
Hashes per second. Large networks use prefixes such as terahashes (TH/s) or exahashes (EH/s) per second.
Does a higher hashrate make transactions faster?
No. Difficulty adjusts so the average block time stays the same; extra hashrate adds security, not speed.
Do proof-of-stake chains have a hashrate?
No. Proof-of-stake networks pick validators by staked coins instead of computing power, so hashrate does not apply.
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