How does Bitcoin mining work?

Miners assemble candidate block data and repeatedly change the nonce to produce a hash below the network target. A valid candidate is shared with other participants, who independently verify it against Bitcoin's rules.

A nonce is a changeable number in a block header. Even a small data change produces a completely different SHA-256 hash, so miners vary the nonce and other fields until the result meets the target.

Bitcoin compares the hash with a numerical target. Requiring leading zeroes is a visual learning simplification: the more zeroes required, the smaller the share of valid hashes and the more attempts are usually needed.

Every attempt is independent, so a valid hash may appear immediately or only after a long search. The displayed time is a probabilistic average based on the measured browser speed, not a countdown or a guarantee.

A browser performs this learning search on a general-purpose processor while also rendering the interface. An ASIC is specialised hardware for Bitcoin hashing, with fundamentally different architecture, speed, and energy use.

On the Bitcoin network, other nodes verify the Proof-of-Work and every other block rule. In this simulation, the result is added only to the local learning chain in this tab. It is not sent to Bitcoin and is not a mined network block.

A stricter target requires more calculations on average. Real energy use also depends on hardware efficiency, cooling, operating conditions, and other factors that this browser demonstration does not model.

No. It does not include the BTC price, block reward, pool fees, electricity tariff, equipment cost, or changes in network difficulty. It explains Proof-of-Work mechanics and does not forecast income or payback.