kHeavyHash (Kaspa PoW Algorithm)
ASIC DominatedkHeavyHash is the proof-of-work algorithm used exclusively by Kaspa — one of the fastest-growing proof-of-work blockchains since 2021. The algorithm is a modified version of HeavyHash, designed to be efficient for ASIC implementation while maintaining a high computation rate suitable for Kaspa's high block frequency (1 block per second using the GhostDAG protocol).
How kHeavyHash Works
kHeavyHash consists of two phases: a matrix multiplication step that uses a large random matrix to process intermediate hash values, followed by a final SHA-256 pass. The matrix multiplication step requires significant memory bandwidth and arithmetic throughput, differentiating it from pure SHA-256. Kaspa's 1-second block time is enabled by its GhostDAG (Directed Acyclic Graph) consensus protocol, which allows parallel blocks to coexist and be referenced rather than being orphaned.
History & Evolution
Kaspa launched in November 2021 as a GPU-minable network, attracting miners with its novel DAG-based consensus mechanism. Dedicated kHeavyHash ASICs arrived in late 2023 (Bitmain KS3, IceRiver KS1/KS3), rapidly eclipsing GPU mining. By 2024, the next-generation KS5 and KS7 models pushed network hashrate to exahash scale. kHeavyHash remains Kaspa-exclusive — no other significant blockchain uses this algorithm.
Hardware Requirements
The kHeavyHash ASIC market is led by Bitmain (KS3, KS5 Pro, KS7) and IceRiver (KS5L, KS5 Pro). The 2025-generation KS7 delivers 70 TH/s at 3,300 W — over 7× the hashrate of the 2023-era KS3 at similar power draw. Because Kaspa is the only kHeavyHash coin, all kHeavyHash ASICs are fully exposed to single-asset price risk.
Compatible Mining Software
Mining Pools for kHeavyHash
K1Pool and WoolyPooly are the two largest Kaspa mining pools. HeroMiners and the official Kaspa Pool are also popular. Kaspa's 1-second block time means pool rewards are very frequent and smooth — even small hashrate operators receive daily payouts from any major pool.
How to Start Mining with kHeavyHash
- Choose hardware — The kHeavyHash ASIC market is led by Bitmain (KS3, KS5 Pro, KS7) and IceRiver (KS5L, KS5 Pro). The 2025-generation KS7 delivers 70 TH/s at 3,300 W — over 7× the hashrate of the 202.
- Install mining software — compatible options include: lolMiner (GPU, legacy), BzMiner (GPU, legacy), GMiner (GPU, legacy), Stock Bitmain KS firmware, Stock IceRiver firmware.
- Select a pool — K1Pool and WoolyPooly are the two largest Kaspa mining pools. HeroMiners and the official Kaspa Pool are also popular. Kaspa's 1-second block time means pool rewards are very frequent and smooth — eve.
- Configure stratum URL and wallet — set
stratum+tcp://pool-url:portas pool address and your KAS wallet address as the username/payout address. - Start mining and monitor — check accepted shares in the pool dashboard within 5–10 minutes of startup.
- Track profitability — use our live calculator to monitor earnings vs electricity costs.
Frequently Asked Questions
What makes kHeavyHash different from SHA-256?
kHeavyHash adds a matrix multiplication phase before the final hashing step, requiring more memory bandwidth and arithmetic capacity compared to pure SHA-256. This design enabled Kaspa to launch as a GPU-friendly network before ASICs arrived. SHA-256 is a pure computation-bound algorithm with no memory-intensive step, which is why Bitcoin ASICs could achieve extreme efficiencies much earlier than kHeavyHash ASICs.
Can I still GPU-mine Kaspa in 2026?
GPU mining Kaspa is no longer economically viable as of 2026. The Antminer KS7 delivers 70 TH/s — vastly more than any GPU. ASIC miners' hashrate advantage (measured in thousands of times the GPU equivalent) means GPU miners earn negligible rewards compared to electricity costs. The kHeavyHash GPU mining era effectively ended in 2024.
Is kHeavyHash ASIC-resistant?
kHeavyHash was originally designed with some ASIC-resistance properties via its matrix multiplication step. However, semiconductor companies (Bitmain, IceRiver) successfully optimised the algorithm for ASIC implementation. The Kaspa community has discussed potential algorithm changes to restore GPU mining viability, but no hard fork has been executed. As of 2026, kHeavyHash is fully ASIC-dominated.
What is Kaspa's GhostDAG and how does it affect mining?
GhostDAG (Directed Acyclic Graph) is Kaspa's consensus protocol that allows multiple parallel blocks to be confirmed rather than being orphaned. Traditional blockchains (like Bitcoin) orphan all but one of any simultaneously found blocks. Kaspa's DAG structure references all parallel blocks, rewarding all miners who found valid blocks within the same timeframe. This enables 1-second block times without sacrificing security.
What is the ROI timeline for kHeavyHash ASICs?
ROI depends heavily on KAS price, electricity cost, and hardware acquisition price. At KAS = $0.05 and $0.06/kWh, the KS7 breaks even in roughly 12–18 months under current difficulty conditions. Kaspa's rapidly growing network hashrate compresses margins over time, so earlier deployment generally yields better ROI. Use our live Kaspa mining calculator for current estimates.