If you have looked into mining Litecoin or Dogecoin, you have run into the word Scrypt, and it decides almost everything about how you mine them: the machine you buy, the power it draws, and what you can earn. The Scrypt algorithm is what both coins use to secure their networks, and it works in a very different way from the one behind Bitcoin.
This guide keeps it simple: what the algorithm is, where it came from, why it exists, how it works, and how mining it actually plays out in 2026. If you already know you want to mine, check what a mining machine earns at your power rate on the asic profit calculator before you read on.
This guide keeps it simple: what the algorithm is, where it came from, why it exists, how it works, and how mining it actually plays out in 2026. If you already know you want to mine, check what a mining machine earns at your power rate on the asic profit calculator before you read on.
Quick answer:
The Scrypt algorithm is a memory-hard cryptographic hash function, created in 2009, that Litecoin, Dogecoin, and other coins use for proof-of-work mining. Unlike SHA-256, it deliberately needs a large amount of memory to run, which is why the hardware and economics of mining these coins look so different from Bitcoin.
What is Scrypt?
Scrypt (said “ess-crypt”) is a password-based key derivation function that doubles as a proof-of-work hashing algorithm. In plain terms, it takes any input and turns it into a fixed, unique fingerprint that cannot be reversed. That is the same core job a hash like SHA-256 does, so the two are often compared.
What sets it apart is one design choice: it is memory-hard. It was built to need a large block of fast memory (RAM) to run, not just raw processing speed. That single property shaped the entire mining ecosystem around Litecoin and Dogecoin, and it is the thread running through the rest of this guide.
So the term shows up in two worlds. To a developer, it is a way to store passwords safely. To a miner, it is the algorithm your machine solves millions of times a second to earn coins. Both meanings are correct, and both come from the same function.
What sets it apart is one design choice: it is memory-hard. It was built to need a large block of fast memory (RAM) to run, not just raw processing speed. That single property shaped the entire mining ecosystem around Litecoin and Dogecoin, and it is the thread running through the rest of this guide.
So the term shows up in two worlds. To a developer, it is a way to store passwords safely. To a miner, it is the algorithm your machine solves millions of times a second to earn coins. Both meanings are correct, and both come from the same function.
Where did Scrypt come from?
Scrypt was created in 2009 by Colin Percival, a computer scientist, for his online backup service Tarsnap. His goal had nothing to do with cryptocurrency. He wanted a way to protect passwords that would be expensive for an attacker to crack with custom hardware, so he designed a function that forces the attacker to spend a lot of memory, not just processing power.
Two years later, in 2011, Litecoin launched and chose this algorithm for mining instead of SHA-256. The reasoning fit the moment: Bitcoin mining was already moving toward specialised machines, and a memory-hard function promised to keep mining open to ordinary computers for longer. Dogecoin followed in 2013 with the same choice, and later tied itself directly to Litecoin, a decision covered further down. This origin story, part password security and part fair-launch idealism, explains why the algorithm behaves the way it does today.
Two years later, in 2011, Litecoin launched and chose this algorithm for mining instead of SHA-256. The reasoning fit the moment: Bitcoin mining was already moving toward specialised machines, and a memory-hard function promised to keep mining open to ordinary computers for longer. Dogecoin followed in 2013 with the same choice, and later tied itself directly to Litecoin, a decision covered further down. This origin story, part password security and part fair-launch idealism, explains why the algorithm behaves the way it does today.
How does Scrypt work?
At a high level, the process is short. You feed in data, the algorithm processes it, and out comes one fixed-length hash. The steps look like this:
- Start with the input. In mining, that is the block header plus a changing number called the nonce.
- Fill a large block of memory. The algorithm generates a big table of pseudo-random data and stores it in RAM. This is the memory-hard step, and it is what makes it distinct.
- Mix it, pass after pass. It reads back from that memory in an unpredictable order and scrambles the data, using SHA-256 and the Salsa20/8 core underneath.
- Output the hash. The result is one fixed-length fingerprint, and the same input always produces the same output.
The memory step is the whole point. A chip can be made to compute a hash very fast, but fast memory is expensive and hard to shrink. By forcing every attempt to use a large chunk of RAM, the design raises the cost of building ultra-specialised hardware. Three parameters, written N, r, and p, let developers tune how much memory and time the function uses, which is why the same algorithm can guard a password or power a blockchain.
For mining, the catch is that a machine has to store and then read back that memory table for every single guess, and it makes trillions of guesses a second. That is why efficient memory handling, not just fast chips, decides who mines profitably. You can see how that translates into real earnings on the profit calculator, and it is the reason the hardware ended up looking so specialised.
For mining, the catch is that a machine has to store and then read back that memory table for every single guess, and it makes trillions of guesses a second. That is why efficient memory handling, not just fast chips, decides who mines profitably. You can see how that translates into real earnings on the profit calculator, and it is the reason the hardware ended up looking so specialised.
Why was Scrypt built to be memory-hard?
The memory-hard design solves a specific problem: specialised hardware. When an algorithm only needs raw computing power, engineers can build a chip that does that one calculation thousands of times faster than a normal computer. That is exactly what happened to Bitcoin, where custom machines quickly pushed out home miners.
By demanding a large amount of memory for every single attempt, the design aimed to level the field. Memory is costly and takes up physical space, so a memory-hard function is far harder to accelerate with a cheap custom chip. In its password-security role, that same property means an attacker cannot simply throw specialised hardware at a stolen password database and crack it quickly.
The plan worked for a few years. Litecoin and Dogecoin stayed mineable on ordinary computers and graphics cards well after Bitcoin had moved on. That head start is a big reason both coins built such large, loyal communities, even though specialised machines did eventually arrive.
By demanding a large amount of memory for every single attempt, the design aimed to level the field. Memory is costly and takes up physical space, so a memory-hard function is far harder to accelerate with a cheap custom chip. In its password-security role, that same property means an attacker cannot simply throw specialised hardware at a stolen password database and crack it quickly.
The plan worked for a few years. Litecoin and Dogecoin stayed mineable on ordinary computers and graphics cards well after Bitcoin had moved on. That head start is a big reason both coins built such large, loyal communities, even though specialised machines did eventually arrive.
How is Scrypt different from other algorithms?
It is one of many proof-of-work algorithms, and each was built for a different kind of hardware. It is one-way and deterministic like all of them, but its memory-hard design keeps setting it apart. The fastest way to understand it is to place it next to the algorithms miners ask about most, and for the Bitcoin side in depth you can also read our guide to what SHA-256 is. Here is how it compares, one rival at a time.
Scrypt vs SHA-256
- It is memory-hard and needs plenty of RAM; SHA-256 is compute-hard and uses almost none.
- It secures Litecoin and Dogecoin, while SHA-256 secures Bitcoin.
- Litecoin blocks arrive every 2.5 minutes against Bitcoin's 10, so rewards come more often.
- Both are one-way and battle-tested, but their opposite hardware means a Bitcoin miner cannot mine Litecoin, and the reverse holds too.
Scrypt vs Etchash (Ethash)
- Etchash (Ethereum Classic) is built for graphics cards; it now runs on dedicated ASICs.
- Both use memory, but Etchash grows a large DAG file while it tunes memory through parameters.
- The dedicated hardware market here is far older and deeper than the GPU-led Etchash one.
Scrypt vs kHeavyHash
- kHeavyHash (Kaspa) chases raw speed and is compute-hard; it leans on memory instead.
- Both are ASIC-mined today, but it has a much longer, deeper hardware track record.
Scrypt vs RandomX
- RandomX (Monero) is built for ordinary CPUs and actively fights ASICs; it is now ASIC-led.
- RandomX stays egalitarian by design, while it started that way before ASICs arrived in 2014.
- You mine one on a computer, the other on a purpose-built machine.
Scrypt vs Blake2B
- Blake2B (Siacoin) is fast and compute-hard; it is memory-hard.
- Its coins carry far more value and liquidity than most Blake2B coins.
Scrypt vs Equihash
- Equihash (Zcash) is memory-oriented too, but tuned for a different memory-versus-time trade-off.
- Equihash stayed GPU-friendly for years, while it moved to ASICs earlier.
- Only merged mining earns two coins at once here, which Equihash cannot match.
- Both are considered secure, so the real choice comes down to coin value and hardware availability.
Side by side, the pattern is clear: a memory-hard core, a mature ASIC market, and two coins from one machine are what make it stand out. Here is each match-up at a glance:
| Comparison | Rival coin | Rival hardware | How Scrypt differs |
|---|---|---|---|
| Scrypt vs SHA-256 | Bitcoin | ASIC | Memory-hard, not compute-hard |
| Scrypt vs Etchash (Ethash) | Ethereum Classic | GPU | Runs on ASICs, not GPUs |
| Scrypt vs kHeavyHash | Kaspa | ASIC | Memory-hard, not speed-first |
| Scrypt vs RandomX | Monero | CPU | ASIC-led, not CPU-only |
| Scrypt vs Blake2B | Siacoin | ASIC | Memory-hard, not compute-hard |
| Scrypt vs Equihash | Zcash | ASIC / GPU | Adds merged mining of two coins |
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How does Scrypt mining work?
Mining these coins is a guessing race, the same shape as Bitcoin mining. Your machine assembles a candidate block, runs it through the algorithm with a changing nonce, and checks whether the resulting hash falls below the network's target. If it does, you win the block and its reward. If not, the machine changes the nonce and tries again, billions of times a second. Our guide to mining Dogecoin and Litecoin walks through the setup step by step.
The network adjusts its difficulty automatically to keep block times steady as miners join or leave. What makes it feel different in practice is the memory demand: every guess touches a large block of RAM, so efficient machines are the ones that move data in and out of memory quickly, not just the ones with the most raw speed.
Most people never mine solo here. They join a pool, combine hashrate with thousands of other miners, and share the rewards in proportion to the work each contributes. Solo mining a 2.5-minute Litecoin block on your own is close to a lottery unless you run a serious farm on cheap power, which is why many operators place their machines in low-cost ASIC miner hosting. Pooled mining is the normal starting point, and merged mining, covered below, makes it more rewarding still.
The network adjusts its difficulty automatically to keep block times steady as miners join or leave. What makes it feel different in practice is the memory demand: every guess touches a large block of RAM, so efficient machines are the ones that move data in and out of memory quickly, not just the ones with the most raw speed.
Most people never mine solo here. They join a pool, combine hashrate with thousands of other miners, and share the rewards in proportion to the work each contributes. Solo mining a 2.5-minute Litecoin block on your own is close to a lottery unless you run a serious farm on cheap power, which is why many operators place their machines in low-cost ASIC miner hosting. Pooled mining is the normal starting point, and merged mining, covered below, makes it more rewarding still.
The rise of Scrypt ASICs
For the first few years, people mined these coins on CPUs and then graphics cards, exactly as the memory-hard design intended. That changed in 2014, when the first dedicated ASICs for this algorithm, machines built only to mine it, reached the market. They were harder and more expensive to engineer than Bitcoin's, which is why they arrived later, but once they did, they set the standard. Today, competitive mining of Litecoin and Dogecoin runs almost entirely on these purpose-built machines, and the gap between models is stark, as our Sealminer DL1 versus Antminer L9 comparison shows.
Which coins use Scrypt?
Litecoin is the flagship, but it is not alone. Any chain that adopted the algorithm inherits its mining model. The main coins on this algorithm are:
| Coin | Ticker | What to know |
|---|---|---|
| Litecoin | LTC | The largest coin on this algorithm, 2.5-minute blocks, launched 2011 |
| Dogecoin | DOGE | Merge-mined with Litecoin, 1-minute blocks, huge community |
| Verge | XVG | Privacy-focused, uses several algorithms including this one |
| Syscoin | SYS | Merge-mined with Bitcoin, but began on this algorithm |
| GameCredits | GAME | Early gaming-focused coin on this algorithm |
In practice, Litecoin and Dogecoin dominate the hashpower because their price and liquidity dwarf the rest. That is also where the algorithm's most useful trick lives. You can compare live payouts across coins on the mining calculator, then browse the machines that mine them in the Litecoin and Dogecoin miners category.
Litecoin and Dogecoin merged mining
Because Litecoin and Dogecoin share the same algorithm, they can be mined together through a system called merged mining, or AuxPoW. Your machine does one set of hashing work, and that work can secure both chains at once. Litecoin is the primary reward and Dogecoin rides along as a bonus, at no extra electricity. It is the closest thing mining has to a free lunch, and our Litecoin and Dogecoin merged mining guide explains how to set it up.
What hardware do you need to mine Scrypt coins?
You cannot mine Litecoin profitably on a laptop anymore. The network runs on dedicated ASICs, and your results come down to two numbers: hashrate, measured in gigahashes per second (GH/s), and efficiency, measured in joules per megahash (J/MH). Lower efficiency is better, because it means less power for the same work. Browse the current lineup in the Litecoin and Dogecoin miners category.
Scrypt ASIC miners, explained
A Scrypt ASIC is a machine whose chips do one job: compute these hashes as fast and efficiently as possible, with the fast memory the algorithm demands built right in. It cannot mine Bitcoin, and a Bitcoin miner cannot mine Litecoin, because the two algorithms need different hardware. Here is how the 2026 lineup breaks down by tier:
- Efficiency leader: Bitdeer Sealminer DL1 at about 25 GH/s and roughly 0.149 J/MH, the most efficient air-cooled Scrypt miner available.
- Proven workhorse: Antminer L9 at around 16 GH/s, the machine most large Litecoin farms are built on. Check live numbers on the L9 profitability calculator.
- Flagship power: Antminer L11 at about 20 GH/s for operators who want maximum output per unit.
- Home tier: Fluminer L1 Pro and similar compact units bring mining into a spare room at far lower power and noise.
Whichever tier you choose, plan for the power draw, the heat, and the noise before the machine arrives. A serious miner runs hot and loud around the clock, so home setups need ventilation and a tolerant household, while larger fleets need cheap power to stay ahead of rising difficulty.
Not sure which tier fits your setup? You can test a live miner for free before you commit a single dollar.
Not sure which tier fits your setup? You can test a live miner for free before you commit a single dollar.
Is Scrypt used outside of mining?
Yes, and this is where its story began. Long before any coin used it, Scrypt was a password-hashing tool. When you create an account on a well-built service, the site does not store your actual password. It stores a hashed version of it, so a data breach does not hand attackers your real credentials. The memory-hard design makes those hashes expensive to crack at scale, which is exactly why it was invented.
Developers reach it as a library rather than a download in the usual sense. It ships inside language toolkits and as packages such as the scrypt module on npm for JavaScript, so building it into an app takes a few lines of code. You will also find it inside some disk-encryption tools and password managers, anywhere a system needs to turn a human password into a strong key without making it easy to brute force. So when you see the term outside a mining context, it usually means this key derivation function, quietly protecting passwords and encryption keys across the internet.
Developers reach it as a library rather than a download in the usual sense. It ships inside language toolkits and as packages such as the scrypt module on npm for JavaScript, so building it into an app takes a few lines of code. You will also find it inside some disk-encryption tools and password managers, anywhere a system needs to turn a human password into a strong key without making it easy to brute force. So when you see the term outside a mining context, it usually means this key derivation function, quietly protecting passwords and encryption keys across the internet.
Why Scrypt matters for miners
It is the quiet decision behind everything about Litecoin and Dogecoin mining. Its memory-hard design set the block times, delayed specialised hardware, kept the early door open to ordinary miners, and made merged mining possible. Understand it, and the rest of the choices, which machine, what power cost, which coin to point it at, start to make sense.
When you are ready to act, compare the machines above, then run your own numbers before you buy. The algorithm is settled. Your setup is the part you control.
When you are ready to act, compare the machines above, then run your own numbers before you buy. The algorithm is settled. Your setup is the part you control.
Ready to start mining Litecoin and Dogecoin? Shop Scrypt ASIC miners or run your profit numbers first.
Frequently asked questions about Scrypt
What does Scrypt do?
It turns any input into a fixed, irreversible hash while deliberately using a large amount of memory. Coins use it for proof-of-work mining, and developers use it to store passwords safely.
Is Scrypt better than SHA-256?
Neither is better overall; they were built for different goals. It is memory-hard and was meant to resist specialised hardware, while SHA-256 is fast and compute-hard. Each suits its own coins and uses.
Is Scrypt still ASIC resistant?
No. It resisted specialised machines longer than SHA-256, but purpose-built ASICs have been on the market since 2014 and now dominate Litecoin and Dogecoin mining.
How does Scrypt protect passwords?
A service stores a hashed version of your password instead of the password itself. The memory-hard design makes those hashes expensive to crack at scale, even with powerful hardware.
Which coins can I mine with a Scrypt miner?
Mainly Litecoin and Dogecoin, and thanks to merged mining you can earn both at once from a single machine. Smaller coins on the same algorithm exist but carry far less value and liquidity.
Is Scrypt secure?
Yes. As both a password function and a mining algorithm it has held up well for over a decade, with no practical break of its core design.
Note: Hashrate, efficiency, block times, and reward figures reflect the Litecoin and Dogecoin networks in 2026 and change over time. Mining profitability depends on your electricity rate, hardware, and coin prices, so always model your own numbers before you buy.
