Rewards, Hardware, Pools and Energy

What is Bitcoin mining?

Bitcoin mining is the process that keeps the BTC network secure and operational.

Bitcoin (BTC) miners collect pending transactions, bundle them into blocks and repeatedly perform hashing attempts (trial and error) until they produce a hash that meets the network’s difficulty target.

The first miner to find a valid solution broadcasts their block. Once the rest of the network verifies it, that miner earns a reward.

If another miner solves the block before you, your result becomes invalid, known as a “stale block,” and you must start over with a new set of transactions for the next block.

As of 2025, the block reward is 3.125 BTC, following the April 2024 halving. Miners also earn transaction fees, which fluctuate based on network congestion.

Competition is fierce, and the barrier to entry is high. Nearly all miners now use specialized Application-Specific Integrated Circuit (ASIC) machines, and most join mining pools to stabilize their income by sharing rewards with other participants.

Did you know? It’s a common misconception that Bitcoin miners “solve complex cryptographic puzzles.” In reality, there’s no puzzle to crack. Miners simply make trillions of guesses every second until one produces a hash below the network’s difficulty target.

How a block is actually found

Here’s a step-by-step look at how a block is mined on the Bitcoin network:

1. A miner builds a candidate block from pending transactions in the mempool.

2. They add a special “coinbase transaction” (not related to the Coinbase exchange), which both mints new BTC and claims transaction fees.

3. The miner repeatedly hashes the block’s header (through SHA-256) while adjusting the nonce (a number only used once).

4. The goal is to find a hash value lower than the network’s current difficulty target.

Once a valid block is found, the miner broadcasts it to the network. Other nodes independently verify its proof-of-work and transactions before adding it to their local copy of the blockchain.

If two miners find valid blocks at nearly the same time, the blockchain can briefly split into two versions. The network resolves this when one branch accumulates more proof-of-work (PoW) and becomes the main chain, while the other is discarded as a “stale” block.

This system ensures Bitcoin’s consensus always follows the chain with the greatest accumulated work, keeping forks short-lived and the ledger resilient.

Mining rewards after the 2024 halving

When Bitcoin’s fourth halving took place in April 2024, the block reward fell from 6.25 BTC to 3.125 BTC.

That’s the fixed reward every miner competes for. With around 144 blocks mined each day, the network issues roughly 450 new BTC daily, not including transaction fees.

The fee wildcard

Transaction fees are what make miner earnings unpredictable.

Around the April 2024 halving, Bitcoin saw a surge in activity triggered by the launch of Runes, a new token protocol that flooded the mempool with transactions. For a short period, transaction fees actually exceeded the 3.125 BTC block reward. Some blocks paid miners tens of BTC in fees alone, a rare windfall compared to the usual baseline.

These spikes, however, were short-lived. By mid-2025, median fees had returned to normal levels as demand cooled.

That pattern is familiar: Whenever the mempool overflows, whether from new protocols, hype cycles or major onchain events, users outbid each other for space in Bitcoin’s limited 1 MB-4 MB block window. Once the backlog clears, bidding wars end and fee revenue returns to baseline.

Hashrate and difficulty

Mining power is measured in hashrate, the total computing power dedicated to securing the Bitcoin network.

Bitcoin keeps block times close to 10 minutes by adjusting mining difficulty every 2,016 blocks, or roughly every two weeks.

Here’s how the cycle works:

• When the hashrate increases, blocks are mined faster than intended, leading to the next adjustment to raise difficulty.

• If the hashrate falls, blocks take longer to produce, and the network lowers difficulty to compensate.

For miners, higher difficulty means earning fewer BTC for the same amount of work. That’s why each difficulty retarget feels like an “earnings report”; it resets revenue expectations for the next two weeks.

In 2025, both the hashrate and difficulty are at record highs. New, more efficient ASIC fleets keep coming online, pushing difficulty upward and forcing older rigs out of the market.

Operators with high power costs are usually the first to shut down unless they can stay afloat by finding cheaper energy or benefiting from sudden spikes in price and fees.

Bitcoin mining is still a constant race: Only the most efficient setups survive when margins tighten.

Did you know? Bitcoin’s 10-minute block time was designed as a compromise: short enough for reasonably quick confirmations yet long enough to minimize the risk of simultaneous block discoveries and chain splits.

Hardware and setups in 2025

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