How Does Kaspa Work?
Kaspa is a proof-of-work Layer 1 blockchain using the novel GHOSTDAG consensus protocol, which allows parallel blocks to coexist in a directed acyclic graph. Fair-launched in November 2021 with no pre-mine or VC allocation, it processes 10 blocks per second. Its B- grade reflects innovative consensus technology with strong academic foundations and no security incidents since 2022, balanced against the realized emission cliff (95.8% of 29B KAS mined as of June 2026), a 74% decline in network hashrate from its February 2026 peak, and new mechanism risk from the Toccata hard fork (June 30, 2026) adding covenant scripting and ZK precompile.
TVL
—
Sector
L1
Risk Grade
B-
Value Grade
D
Core Mechanisms
Consensus/DAG
NovelGHOSTDAG — a blockDAG consensus protocol that extends Nakamoto consensus by allowing parallel blocks to coexist rather than discarding orphans. The protocol orders blocks within a directed acyclic graph while maintaining the security guarantees of single-chain PoW, enabling 10 blocks per second with a target of 100 BPS
GHOSTDAG is a genuine academic innovation by Dr. Yonatan Sompolinsky. Unlike traditional blockchains that select one block per height, GHOSTDAG includes all blocks and orders them, increasing throughput without sacrificing security. This approach has not been deployed at scale by any other major protocol.
Consensus/PoW
kHeavyHash mining — a proof-of-work algorithm combining SHA-256 with a heavy matrix multiplication step, designed to be ASIC-friendly while maintaining energy efficiency relative to pure SHA-256 mining
While kHeavyHash has specific properties, PoW mining is a well-understood mechanism. The transition from GPU to ASIC mining follows the standard PoW maturation pattern seen with Bitcoin and Litecoin.
Token-Supply/Halving-Schedule
NovelChromatic emission schedule — block rewards decrease geometrically based on a musical 12-note chromatic scale, halving approximately annually but smoothed so that rewards decrease by a factor of (1/2)^(1/12) each month. Started at 440 KAS per block in May 2022
The chromatic emission schedule is a novel approach to supply reduction. While halving schedules are standard (Bitcoin), Kaspa's monthly smooth reduction based on musical intervals is unique. As of June 2026, 95.8% of the 29B total supply has been mined, with the security budget cliff now actively materializing.
Network/UTXO
UTXO transaction model — Kaspa uses the Bitcoin-style UTXO model for transactions, providing parallel transaction processing capabilities and simple verification of transaction validity
Standard UTXO model as used by Bitcoin. Provides good parallelization for payment transactions but limits programmability compared to account-based models. The Toccata hard fork (June 30, 2026) extends this with covenant-based scripting.
Network/Block-Propagation
High-frequency block propagation — at 10 blocks per second, Kaspa requires efficient block propagation across the mining network. The GHOSTDAG protocol tolerates delayed blocks by including them in the DAG rather than orphaning them
The tolerance for parallel blocks reduces the orphan rate penalty, but the fundamental block propagation challenges at high frequency are addressed through the GHOSTDAG protocol itself.
How the Pieces Interact
BlockDAG security at high throughput — the GHOSTDAG protocol's security proofs assume honest majority hashrate, but at 10+ blocks per second, the attack surface expands because an attacker can create more parallel blocks within the DAG. The interplay between block rate and security margin is less empirically tested than Bitcoin's single-block model. The 74% hashrate decline since February 2026 has substantially reduced the absolute cost of a majority attack
Mining economics post-emission — with 95.8% of supply mined as of June 2026, this scenario is now actively materializing. Block rewards have declined to ~2.60 KAS/block (~$0.08), driving hashrate down 74% from peak. Multiple mining pools have exited entirely. Transaction fee revenue (no smart contracts pre-Toccata) cannot offset the reward decline at current KAS prices
Network partition amplification — at 10 blocks per second, network partitions create rapid DAG divergence. While GHOSTDAG handles this gracefully in theory, real-world network fragmentation could create extended periods of uncertainty about transaction finality
Security budget cliff — the chromatic emission schedule has aggressively reduced block rewards and the UTXO-only transaction model pre-Toccata has not generated sufficient fees to sustain mining security at prior hashrate levels. This scenario is actively occurring as of June 2026, with hashrate at 388 Ph/s vs. 1,470 Ph/s peak
ASIC centralization — as kHeavyHash ASICs dominate, mining has concentrated among large operators with preferential access. At reduced overall hashrate, the remaining ASIC operators (top 2 pools at ~40%) have a structurally larger share of block production at 10 BPS
What Could Go Wrong
- 74% hashrate decline from peak — the emission cliff has arrived (95.8% of 29B KAS mined as of June 2026), causing block rewards to drop from ~65 KAS to ~2.60 KAS per block. Hashrate fell from 1,470 Ph/s in February 2026 to ~388 Ph/s, reducing 51% attack costs by approximately 74%. Multiple major mining pools (Nanopool, F2pool) have exited Kaspa mining entirely
- Toccata hard fork (June 30, 2026) introduces new L1 covenant scripting (KIP-17) and ZK Groth16 precompile (KIP-16) — while both are well-studied primitives, their interaction with GHOSTDAG's parallel block ordering at 10 BPS is untested in production. New attack surfaces include covenant script complexity bugs and ZK verifier edge cases
- Security budget long-term viability — with transaction fees at ~$68K/day equivalent and no smart contract DeFi generating fee revenue, sustained mining profitability depends on KAS price appreciation. The UTXO-only design pre-Toccata has generated minimal organic fee pressure
- Mining centralization post-emission — top 2 pools (HumPool 27%, Kryptex 13%) now control ~40% of hashrate. As unprofitable miners exit, concentration among the remaining large ASIC operators increases the probability of coordinated censorship or reorganization attempts
Post-emission security budget crisis collapses mining participation
ElevatedTrigger: The chromatic emission schedule has driven KAS block rewards to ~2.60 KAS/block as of June 2026 (95.8% of total supply mined). Hashrate has already declined 74% from the February 2026 peak of 1,470 Ph/s to ~388 Ph/s. This scenario is actively unfolding — the question is whether hashrate stabilizes at a level sufficient for network security or continues declining toward a critical threshold
- 1.Block rewards continue declining toward zero in late 2026 and 2027; remaining miners without access to the lowest-cost electricity exit. Transaction fee revenue from Toccata covenant applications fails to materialize quickly enough to replace block reward income, keeping total daily miner revenue below operating costs for mid-tier operators — Hashrate falls below 200 Ph/s, concentrating mining among the 2-3 largest ASIC operators with sub-$0.02/kWh electricity. The top 2 pools (HumPool, Kryptex) already control ~40% — further attrition could push the top 2 above 51%
- 2.With hashrate at a fraction of its peak, the cost of renting sufficient hashpower for a 51% attack drops to economically feasible levels. An attacker with ~200 Ph/s (roughly matching current total) can produce competing DAG branches; at 10 BPS, the attack surface is wider than single-chain PoW because parallel blocks must all be processed — Exchange confirmation requirements for KAS deposits increase to 100+ confirmations; major exchanges delist or suspend KAS deposits citing security concerns, reducing liquidity and utility
- 3.Reduced liquidity and security doubts cause KAS price to fall further, making mining even less profitable and accelerating the hashrate decline in a negative feedback loop — Kaspa enters a death spiral of declining security, reduced utility, and lower price. Recovery requires either a significant KAS price appreciation (unlikely in a declining ecosystem) or an emergency protocol change to re-distribute emissions (requires community consensus hard fork)
Risk Profile at a Glance
Overall: B- (28/100)
Lower score = safer