Crypto Mining Basics: Hardware, Economics, and Why Mining Still Matters

What Mining Does

Mining serves two functions on a Proof of Work blockchain. First, it produces new blocks, adding user transactions to the ledger. Second, it creates the network's security budget. The electricity miners burn and the hardware they deploy are what make attacking the network economically infeasible.

Miners compete to find a valid block by computing hashes as fast as they can. The first miner to find a hash meeting the network's difficulty target gets to propose the next block and claim the reward. Miners don't solve useful math problems; they compute billions of hashes per second specifically to make block production costly and attacks expensive.

Our guide to Proof of Work covers the consensus mechanism itself in detail. This guide focuses on mining operations, hardware, and economics. Once you understand how miners earn coins, their on-chain behavior becomes readable too, which is what miner flows track as a market signal.

Mining Hardware

ASICs

ASICs are chips designed specifically for one hash function. A Bitcoin ASIC computes SHA-256 hashes and nothing else. It's radically more efficient at SHA-256 than any general-purpose processor, which is why Bitcoin mining moved from CPUs (2009-2010) to GPUs (2010-2012) to FPGAs (briefly) to ASICs (2013 onward) as each technology outclassed the one before it.

Modern Bitcoin ASICs produce terahashes per second while consuming kilowatts of electricity. Efficiency (measured in joules per terahash) is the dominant specification. Industry-leading units produce around 15 J/TH. Older generations at 25-40 J/TH struggle to break even when BTC prices are low.

GPU Mining

Before ASICs existed, GPUs dominated. They still do on chains designed to resist ASIC development:

• Ethereum Classic (Etchash): GPU-friendly, rebranded post-ETH merge
• Monero (RandomX): CPU-optimized; ASIC resistance is protocol policy
• Ravencoin, Ergo, Flux, Conflux: GPU-friendly mid-cap PoW chains
• Kaspa (kHeavyHash): GPU-friendly; ASICs now dominate but GPUs still competitive

GPU mining revenue is much lower than Bitcoin ASIC revenue per watt, but GPU miners are more flexible. When one coin's profitability drops, GPU miners can switch to another chain or repurpose hardware for graphics work or AI training.

Home Mining

A small home Bitcoin mining operation (one or two modern ASICs running in a garage) is possible but rarely profitable at retail electricity rates ($0.10-$0.15/kWh in most developed markets). It works for people with off-grid solar, time-of-use rates with cheap overnight power, or heating-integrated setups where the miner's waste heat is useful.

Home GPU mining for alts can be profitable at lower electricity prices but faces the same fundamental challenge: competing against industrial-scale operations paying $0.03/kWh.

Mining Pools

A single Bitcoin ASIC has a tiny fraction of network hashrate. It might find one block per decade at average luck. That variance is unworkable; miners need regular income. Pools solve the variance problem.

A mining pool combines the hashrate of many miners. The pool software coordinates work (assigning different ranges of nonces to each miner) and finds blocks collectively. When the pool finds a block, it distributes the reward to miners proportionally to the hashrate they contributed.

The tradeoff: pool centralization. A handful of pools (Foundry USA, Antpool, ViaBTC, F2Pool) control the majority of Bitcoin hashrate at any given time. This creates theoretical concentration risk. In practice, pool operators don't control miner hardware and cannot unilaterally attack the network; miners can switch pools quickly if an operator misbehaves.

Industrial Mining

Large-scale mining operations run thousands to tens of thousands of ASICs in purpose-built facilities. They negotiate direct power contracts, often below utility retail rates, and locate near cheap energy sources (hydro, flared gas, stranded renewables).

Public mining companies are the most visible example:

Public miner stocks are leveraged plays on Bitcoin. They typically outperform BTC in bull markets (hash expansion, multiple expansion) and underperform in bear markets (reverse effect plus capital dilution through share issuances to survive). Tracking their earnings and hashrate reports provides additional intelligence on mining economics.

Mining Economics

Miner revenue per day = (miner hashrate / network hashrate) * (block reward + fees) * 144 blocks

Miner cost per day = power consumption (kW) * electricity cost ($/kWh) * 24

Profit = revenue minus costs, minus amortized hardware cost, minus operational overhead.

The operating margin depends on:

• Hardware efficiency: an S19 at 30 J/TH is twice as efficient as an S9 at 100 J/TH. At the same electricity rate, the S19 produces far more revenue per dollar of power.
• Electricity cost: at $0.03/kWh, most modern hardware is profitable. At $0.15/kWh, only the most efficient hardware survives bear markets.
• Difficulty adjustments: as hashrate grows, difficulty rises and each miner's share of rewards falls. Miners running old hardware at high electricity cost are squeezed out first.
• Fees: during high-fee periods (ordinal inscriptions, DeFi congestion), transaction fees can exceed the block subsidy. Miners love this. Users typically don't.

Halvings and Miner Capitulation

Every Bitcoin halving cuts miner revenue in half overnight. Marginal miners become unprofitable and shut down. Hashrate drops. Surviving miners capture higher share of rewards.

The transition period typically lasts weeks to months. The Hash Ribbons indicator tracks this directly, measuring when short-term hashrate averages cross below long-term averages (capitulation) and back above (recovery). Historically, hash ribbon buy signals have marked cycle bottoms within months.