The Puzzle at the Heart of Bitcoin
When you send a Bitcoin transaction, it lands in a shared waiting room called the mempool. Thousands of miners around the world race to bundle those transactions into a block, hash the block using the SHA-256 algorithm, and publish it to the network. The first miner whose hash falls below the current difficulty target wins the block reward and the transaction fees inside it.
What Does "Hashing" Actually Mean?
A hash is a one-way fingerprint. Given a chunk of data, SHA-256 produces a 256-bit number. Change a single comma in the input and the output changes completely. Miners cannot work backwards — they can only try inputs over and over, hoping that the output starts with enough leading zeros to beat the current target.
In 2026 the Bitcoin network performs over 550 exahashes per second — that is 5.5 × 10²⁰ attempts per second, every second, worldwide.
Why Electricity Is the Main Cost
Every hash attempt consumes energy. The entire Bitcoin network is essentially a giant lottery in which the buying power of tickets is measured in kilowatt-hours. The miner with the cheapest electricity and the most efficient hardware wins the most blocks over time.
The Block Reward
A successful miner receives two things: newly minted Bitcoin (currently 3.125 BTC per block after the 2024 halving) and every transaction fee in the block. The reward halves roughly every four years, gradually shifting Bitcoin's security budget from minted coins to user-paid fees.
Where Cloud Mining Fits In
Running a rig at home means dealing with noise, heat, dedicated circuits, and constant firmware maintenance. Cloud mining lets you rent hash power from data centres that already solved those problems at industrial scale. You get exposure to the reward without the hardware headaches.