Solo Mining Terminology: Essential Terms Every Miner Must Know

Hey, I’m Hugo, 13 years old, from Berlin. My friend Makar and I started this whole solo mining thing as a school project — and honestly, it kind of took over our lives. What began as a one-week internship at a startup turned into us actually building mining rigs in my room and trying to find blocks on our own.

The first problem? We didn’t understand a single word. Hashrate, difficulty, block rewards, orphan blocks — it felt like everyone on Discord was speaking a different language. I once asked what “DAG size” meant and got laughed at. Not fun.

So Makar and I made this guide — the one we wish we had when we started. Every term you actually need to know as a solo miner, explained the way we would explain it to a friend. Not the fancy academic stuff, but the practical vocabulary that helps you choose coins, configure hardware, and understand your chances of finding blocks.

Core Solo Mining Terminology You’ll Use Every Day

These are the terms you’ll see in every mining software, every coin’s documentation, and every forum discussion about solo mining. Master these first.

Hashrate (H/s, KH/s, MH/s, GH/s, TH/s)

Hashrate is how many guesses your hardware makes per second trying to find a valid block. Think of it like this: you’re trying to guess a really specific number, and hashrate is how many guesses you can make every second.

The units scale up:

• H/s (Hashes per second): Base unit, basically useless for modern mining
• KH/s (Kilohashes per second): 1,000 hashes per second — CPU mining territory
• MH/s (Megahashes per second): 1,000,000 hashes per second — typical for GPU mining algorithms like Ethash or KawPow
• GH/s (Gigahashes per second): 1,000,000,000 hashes per second — some ASIC territory
• TH/s (Terahashes per second): 1,000,000,000,000 hashes per second — Bitcoin ASICs live here

My RTX 3060 Ti does about 62 MH/s on Ethash. A Bitcoin ASIC like the Antminer S19 Pro does 110 TH/s. Completely different leagues.

What I wish I knew earlier: Higher hashrate doesn’t automatically mean more profit. Efficiency (how much power you use per hash) matters way more for long-term mining. A card doing 100 MH/s at 300W is better than one doing 110 MH/s at 400W.

Network Hashrate vs. Your Hashrate

This is where solo mining gets real. Network hashrate is the combined hashing power of everyone mining that coin. Your solo mining chances depend entirely on your percentage of the total network hashrate.

If Ethereum Classic has a network hashrate of 150 TH/s and you’re contributing 60 MH/s, you control 0.00004% of the network. That’s your slice of the pie, and it directly determines how often you’ll find blocks.

Some coins publish their network hashrate on block explorers. Others you have to estimate from difficulty and block times. Always check this before solo mining — it’s the single most important number for calculating your odds.

Difficulty

Difficulty adjusts how hard it is to find a valid block. Most coins adjust difficulty automatically to keep block times consistent even as miners join or leave the network.

Higher difficulty = harder to find blocks. Lower difficulty = easier to find blocks.

For solo miners, difficulty directly affects your chances. When a coin’s difficulty doubles, your odds of finding the next block get cut in half. Difficulty and network hashrate move together — more miners join, difficulty increases to keep block times stable.

Bitcoin adjusts difficulty every 2,016 blocks (about two weeks). Ethereum-based coins adjust every block. Some smaller coins adjust every few hours. This matters because a coin with rapidly increasing difficulty will crush your solo mining odds faster than you expect.

Block Reward

The block reward is what you actually earn when you find a block solo mining. It includes two parts:

• Block subsidy: The new coins created with each block (this decreases over time in most coins)
• Transaction fees: Fees users paid to include their transactions in the block

Bitcoin’s block reward is currently 6.25 BTC (plus fees). Ethereum Classic pays 2.56 ETC. Ergo pays 66 ERG per block right now but that decreases over time.

For solo miners, block reward is everything. You’re either earning the full block reward or earning nothing. There’s no middle ground. That’s why you absolutely need to know what you’re chasing before you start mining.

No joke: I spent three weeks solo mining a coin where the block reward had just halved and I didn’t notice. My profitability calculations were completely wrong.

Block Time

Block time is how often the network finds a new block on average. Bitcoin targets 10 minutes. Ethereum Classic targets about 13 seconds. Ravencoin targets 1 minute.

Shorter block times mean more frequent opportunities to find blocks, but each block is worth less (since daily emission is divided across more blocks). Longer block times mean fewer chances but bigger rewards.

For solo mining, block time affects your variance. A coin with 10-minute blocks gives you way more chances per day than one with 2-minute blocks, assuming similar difficulty.

Advanced Solo Mining Terminology That Actually Matters

Once you’ve got the basics down, these terms become super relevant for understanding why your solo mining setup behaves the way it does.

Orphan Blocks (Also Called Stale Blocks)

This one hurts. An orphan block is when you find a valid block, but someone else found a competing block at nearly the same time and theirs got accepted by the network instead of yours.

You did all the work, found a valid solution, but you earn exactly zero because the network chose someone else’s block. It’s like crossing the finish line in a race and then getting told someone else actually finished first and your time doesn’t count.

Orphan rates increase when:

• Your internet connection is slow
• You’re geographically far from most network nodes
• The coin has very short block times (more competition for each block)
• Network propagation is poor

Pool miners split orphaned blocks across everyone, so the loss is minimal. Solo miners eat the entire loss. That’s why stable, fast internet is non-negotiable for solo mining.

I’ve had exactly one orphan block in my mining career so far. Found a Ravencoin block, got super excited, then watched it disappear from my wallet about 30 seconds later. Absolutely brutal.

DAG (Directed Acyclic Graph) and DAG Size

The DAG is a dataset that Ethash-based coins (Ethereum, Ethereum Classic, others) store in your GPU’s memory while mining. The DAG grows over time, and eventually, older GPUs with less VRAM can’t mine those coins anymore.

Current DAG sizes (as of 2026):

• Ethereum Classic: Around 5.5 GB
• Ubiq: Around 4 GB
• Expanse: Around 3.8 GB

If your GPU has 4GB of VRAM, you literally cannot mine Ethereum Classic anymore because the DAG won’t fit in memory. This is why old mining GPUs eventually become paperweights for Ethash coins.

Other algorithms don’t use a DAG, so this only matters for Ethash-based mining.

Shares (and Why Solo Miners Don’t Care)

In pool mining, a share is proof that you did some work, even if you didn’t find a block. Pools pay you based on how many shares you submit.

In solo mining, shares mean nothing. You either find a block (and earn everything) or you don’t find a block (and earn nothing). Some solo mining software still shows “accepted shares” but it’s just tracking your hashing progress — you’re not earning anything from those shares.

This confuses new solo miners all the time. They see “1,000 shares accepted!” and think they earned something. Nope. Those shares are worthless in solo mining unless one of them is a valid block.

Pool Fee vs. Solo Mining (Zero Fees)

Pools charge fees, usually 1-3% of your earnings. Some charge more. That’s how they pay for servers and make money.

Solo mining has zero fees. When you find a block, you keep 100% of the block reward. No pool taking a cut.

This is one of the main appeals of solo mining — if you have enough hashrate to find blocks regularly, you earn more solo than in a pool (assuming you can handle the variance).

Uncle Blocks (Ethereum-Family Coins Only)

Some Ethereum-based coins reward uncle blocks — blocks that were valid but didn’t make it into the main chain. It’s like a consolation prize for nearly finding the block.

Ethereum Classic rewards uncles. Bitcoin doesn’t (orphan blocks earn nothing). This reduces the sting of orphaned blocks somewhat on ETC and similar coins.

Uncle rewards are smaller than regular block rewards — usually 50-87.5% of the full block reward depending on how many blocks behind yours was included.

Hardware-Related Terminology for Solo Miners

Understanding your hardware’s capabilities and limitations is essential for realistic solo mining. These terms come up constantly when choosing equipment or troubleshooting.

Efficiency (J/MH, J/TH, W/MH)

Efficiency measures how much power you consume per unit of hashrate. Lower is better — it means you’re getting more hashing power per watt.

Bitcoin ASICs use J/TH (joules per terahash). GPU miners often use W/MH (watts per megahash).

Example: An RTX 3060 Ti does about 62 MH/s at 120W = roughly 1.94 W/MH. An RTX 3080 does about 100 MH/s at 220W = roughly 2.2 W/MH. The 3060 Ti is more efficient even though it has lower total hashrate.

For solo miners running equipment 24/7, efficiency directly determines profitability. Electricity costs add up fast.

Overclocking and Undervolting

Overclocking increases your GPU’s clock speeds to squeeze out more hashrate. Undervolting reduces voltage to lower power consumption without losing much (or any) hashrate.

Most serious GPU miners overclock memory and undervolt the core. This maximizes hashrate while minimizing electricity costs.

For solo mining, efficiency matters more than raw hashrate in most cases. A card doing 58 MH/s at 100W is better than the same card doing 62 MH/s at 140W — the electricity savings add up over months of mining.

Warning: Overclocking too aggressively can cause instability, crashes, or invalid shares. For solo mining, stability is everything — a crash during the 30 seconds when you would’ve found a block means you miss the block entirely.

ASIC vs. GPU vs. CPU Mining

These are the three main hardware categories:

ASIC (Application-Specific Integrated Circuit): Purpose-built machines for mining one specific algorithm. Incredibly efficient but expensive and inflexible. Bitcoin is ASIC-only now — GPU and CPU mining are completely pointless.

GPU (Graphics Card): Flexible, can mine many different algorithms. Decent efficiency. Popular for Ethash, KawPow, Autolykos2, and other GPU-friendly algorithms. Can be resold for gaming if mining becomes unprofitable.

CPU: Your computer’s processor. Very low hashrate for most algorithms. Only viable for RandomX (Monero) and a few other CPU-optimized coins. Not worth it for solo mining in most cases.

For solo mining, ASICs give you the best chance on major coins like Bitcoin — if you can afford them and handle the power consumption. GPUs work better for smaller coins where difficulty is lower. USB miners are basically lottery tickets with terrible odds.

To give you a rough idea of what’s out there and what it costs — here are some popular options across all three categories:

Lottery & USB Miners (Under $100 — Just for Fun)

Compact ASIC Miners ($100–$500 — Entry-Level Solo Mining)

Serious ASIC Miners ($1,500+ — Real Solo Mining Hardware)

GPUs for Solo Mining ($200–$800)

Rejected Shares / Invalid Shares

When your mining software submits a solution that isn’t valid, it gets rejected. Common causes:

• Overclocking too aggressively (hardware errors)
• Outdated mining software
• Network issues (stale work)
• Incorrect configuration

A few rejected shares (under 1%) are normal. If you’re seeing 5%+ rejections, something is wrong and you’re wasting electricity mining invalid work.

For solo miners, rejected shares are worse than for pool miners because you have so few chances to begin with. Every invalid share could’ve been the winning block.

Profitability and Economics Terminology

Solo mining is gambling, but educated gambling. These terms help you calculate whether the gamble makes sense.

Expected Time to Block (ETTB)

This is the average time it would take to find a block given your hashrate and the network difficulty. It’s a statistical estimate — you could find a block in 5 minutes or go 5x longer than the estimate without finding anything.

Formula (simplified): ETTB = (Network Difficulty × 2³²) / (Your Hashrate × Blocks Per Second)

Don’t worry about doing the math yourself — calculators exist. But understanding that ETTB is an average helps manage expectations. Half of solo miners will wait longer than their ETTB before finding their first block.

If your ETTB is 500 days, solo mining that coin is probably a bad idea unless you just want to gamble for fun.

Variance and Luck

Variance is the natural randomness in when you find blocks. With pool mining, variance is low — you earn steadily every day. With solo mining, variance is insane — you might find two blocks in one day, then nothing for months.

Luck is how your actual results compare to statistical expectations. If you find a block in half your expected time, you got lucky (200% luck). If it takes twice as long, you got unlucky (50% luck).

Over long periods, luck averages out to 100%. But “long periods” might mean years for solo miners with low hashrate.

Important: Variance is not a bug, it’s how solo mining works. You’re gambling on finding blocks. Sometimes you win fast, sometimes you wait forever. That’s the game.

ROI (Return on Investment)

ROI measures how long it takes to earn back your initial hardware investment through mining revenue. For solo mining, ROI calculations are tricky because your income is so unpredictable.

Pool mining ROI is straightforward: Daily earnings × 365 days = yearly revenue. Divide hardware cost by yearly revenue = ROI in years.

Solo mining ROI requires probability calculations. You need to factor in your chance of finding blocks and the variance in timing. A solo miner with a 1% chance per day of finding a block might wait 300 days (bad luck) or find one in 20 days (good luck). ROI varies wildly depending on luck.

Honest warning: Most small-scale solo mining setups never achieve ROI. You’re mining for the thrill and the possibility of hitting a block, not as a guaranteed investment.

Breakeven Electricity Price

This is the electricity cost at which your mining revenue exactly equals your power bill. Mine below this price and you’re profitable (if you find blocks). Mine above it and you’re losing money even if you find blocks.

Example: You’re mining Alephium with a rig pulling 500W. That’s 12 kWh per day. If blocks are worth $100 and you expect one block every 20 days (statistically), your daily revenue is $5. Your breakeven electricity price is $5 / 12 kWh = $0.42 per kWh.

If you pay more than $0.42/kWh, you’re losing money in the long run even when you find blocks. Electricity costs can kill solo mining profitability faster than difficulty or price changes.

Network and Protocol Terminology

These terms help you understand how blockchains work and why certain things affect your solo mining.

Block Height

Block height is just the position of a block in the blockchain. Bitcoin block height is currently over 800,000. The first block ever mined (Genesis Block) was block 0.

Block height matters for solo miners because many coins have scheduled events at certain heights — halvings, difficulty adjustments, algorithm changes, etc.

Blockchain Fork

A fork happens when a blockchain splits into two versions. Hard forks change the protocol rules (like when Ethereum Classic split from Ethereum). Soft forks are backwards-compatible upgrades.

Forks can affect solo mining if they change the algorithm, block reward, or difficulty adjustment mechanism. Always check if a coin you’re solo mining has upcoming forks — they might break your mining software or change profitability dramatically.

Mempool

The mempool is where unconfirmed transactions wait to be included in blocks. Miners choose which transactions to include based on fees (higher fees = higher priority).

For solo miners, mempool size affects your transaction fee earnings. A full mempool means higher fees, which increases your block reward. Bitcoin’s mempool can add significant value to blocks during busy periods.

51% Attack

A 51% attack happens when someone controls more than half the network hashrate and can manipulate the blockchain (double-spend, reverse transactions, etc.).

This matters for solo miners because coins vulnerable to 51% attacks are risky to mine. If an attack happens, exchanges might delist the coin, price crashes, and your mined blocks could become worthless.

Small coins with low network hashrate are more vulnerable. Bitcoin and Ethereum Classic are basically immune due to massive network hashrate.

Solo Mining Strategy Terminology

These aren’t official technical terms, but they’re concepts every solo miner should understand when planning their strategy.

Lottery Mining

This is what I call solo mining with extremely low odds — like using a USB miner to solo mine Bitcoin. Your statistical chance of finding a block in your lifetime is near zero, but technically it’s possible.

Lottery mining is purely for fun. You’re not expecting profit, you’re hoping for a miracle. Some people enjoy running a small ASIC or old GPU as a lottery ticket.

If that appeals to you, go for it — but recognize it for what it is. Don’t calculate ROI or profitability. Just enjoy the gamble.

Opportunistic Solo Mining

This is switching to solo mining during specific conditions when your odds improve — right after a coin launches, when difficulty drops temporarily, or when most miners leave for another coin.

Smart solo miners watch for these opportunities. New coins often have low initial difficulty before everyone jumps in. Difficulty drops after price crashes when pool miners leave. These windows offer better odds for finding blocks.

Multi-Coin Solo Mining

Running different GPUs on different coins simultaneously to spread your bets. Instead of pointing all your hashrate at one coin, you solo mine 3-4 different coins with portions of your rigs.

This doesn’t improve your overall odds mathematically, but it feels better psychologically because you have multiple chances of finding blocks instead of betting everything on one coin.

Terms You Can Safely Ignore (For Now)

Honestly? Most solo miners don’t need to know these terms unless you’re getting really deep into the technical side:

• Nonce: The random number miners adjust to find valid blocks. Your software handles this automatically.
• Merkle Root: Cryptographic tree of transactions in a block. Doesn’t affect your mining strategy.
• Target Hash: The threshold a block hash must be below to be valid. Related to difficulty but you don’t need to calculate it manually.
• Block Header: Metadata of a block. Mining software handles this.

These terms appear in technical documentation, but unless you’re writing your own mining software or really diving into blockchain theory, you can skip them.

Stay Away From: Misleading Terminology

Some terms are thrown around incorrectly in mining forums. Here’s what to watch out for:

“Guaranteed ROI in X Months”

Nobody can guarantee ROI in solo mining. Variance is too high. Anyone claiming guaranteed returns is either lying or doesn’t understand solo mining.

Even pool mining ROI isn’t guaranteed because coin prices fluctuate, difficulty changes, and hardware can fail. Solo mining adds massive variance on top of that.

“Passive Income from Solo Mining”

Solo mining is gambling, not passive income. Passive income is stable and predictable. Solo mining pays nothing most days, then potentially a lot on one day. That’s active gambling, not passive income.

Pool mining can be semi-passive income (though still risky). Solo mining absolutely cannot.

“Low-Difficulty Coins are Easy to Mine Solo”

Low difficulty means the network hashrate is low, which sounds good — but it usually also means the coin has no liquidity, few exchanges list it, and the price is terrible or nonexistent.

Yes, you might find blocks easily. But those blocks might be worth $0.50 while you spent $5 in electricity mining them. Low difficulty is not automatically good for solo mining.

Resources for Learning More Solo Mining Terminology

If you want to keep expanding your knowledge:

• Coin whitepapers: Most coins publish technical documentation explaining their mining mechanisms
• Mining software documentation: Programs like lolMiner, T-Rex, and srbminer publish detailed documentation
• Block explorers: Sites like Blockchair, Etherscan (for ETC), or coin-specific explorers show real-time network data
• Mining Discord servers: Communities for specific coins often have helpful veterans who’ll answer terminology questions

Our beginner setup checklist covers practical terminology in the context of actually setting up a solo mining rig. The hardware glossary and how solo mining works guide dive deeper into specific topics.

Secure Your Winnings

Finding a solo block means receiving 3.125 BTC directly to your wallet — currently worth over $250,000. That amount should never sit on an exchange.

Two hardware wallets we recommend for solo miners:

Ledger Nano X (~$149) — Industry standard, supports BTC natively
Buy Ledger Nano X

Trezor Model T (~$179) — Open-source firmware, strong community trust
Buy Trezor Model T

Frequently Asked Questions

What’s the most important solo mining term to understand first?

Hashrate and network hashrate are the foundation. Your percentage of total network hashrate determines everything else — your odds of finding blocks, expected time to block, and whether solo mining even makes sense for a given coin. Master those concepts and the rest becomes much clearer.

Do I need to memorize all these terms before starting solo mining?

Not really. You’ll pick up most terms naturally as you mine. Focus on understanding hashrate, difficulty, block reward, and variance first. The rest you can look up when you encounter them. Mining is way more learn-by-doing than learn-by-reading.

Why do some coins use different hashrate units (MH/s vs TH/s)?

Different algorithms produce vastly different hashrates. SHA-256 (Bitcoin) generates trillions of hashes per second, so TH/s makes sense. Ethash generates millions of hashes per second, so MH/s is more readable. It’s just scaling for convenience — like measuring distance in inches vs. miles depending on context.

What does it mean when people say solo mining is “variance heavy”?

It means your earnings are extremely unpredictable. You might earn nothing for months, then suddenly hit a block and earn thousands of dollars in one day. Pool mining smooths out variance by paying you small amounts daily. Solo mining is all-or-nothing, so your income swings wildly depending on luck.

How does terminology differ between pool mining and solo mining?

Pool mining uses terms like “shares,” “pool luck,” and “pool fees” which don’t matter for solo mining. Solo mining focuses more on “expected time to block,” “network hashrate percentage,” and “variance” because you’re gambling on finding full blocks instead of earning steady share-based payments. The hardware terms are mostly the same, but the strategy vocabulary is completely different.