Who is safest under the threat of quantum computing? An analysis of the quantum resistance of privacy coins Zcash, Monero, and Dash

The threat of quantum computing to the encryption industry has evolved from an academic hypothesis in Q2 2026 to an urgent industry-wide concern. By the end of March 2026, Google’s Quantum Artificial Intelligence team released a 57-page technical white paper, jointly authored with Ethereum Foundation researcher Justin Drake and Stanford cryptography professor Dan Boneh, systematically assessing the resources required for quantum computers to crack the cryptography underlying cryptocurrencies. The conclusion sent shockwaves through the industry: breaking the 256-bit elliptic curve cryptography relied upon by Bitcoin and Ethereum would require fewer than 500k physical qubits—nearly a 20-fold reduction from previous estimates. Analysis suggests that a sufficiently powerful quantum computer could theoretically reduce the cracking time to about 9 minutes.

This technological inflection point directly triggered a fierce rotation of market capital. In the privacy sector, market focus quickly shifted to assets believed to possess quantum-resistant capabilities. Meanwhile, the National Institute of Standards and Technology (NIST) has officially approved the first post-quantum cryptography standards, and China has released its national post-quantum cryptography standards, making 2026 the inaugural year for post-quantum cryptography commercialization.

Facing the same threat, the three major privacy coins—Zcash, Monero, and Dash—exhibit markedly different defensive capabilities due to their underlying cryptographic architectures and upgrade paths.

Google’s White Paper Triggers a Reshaping of Privacy Coin Security Landscape

On March 30, 2026, Google’s Quantum AI team published a white paper that presented, for the first time in a systematic and quantifiable manner, the potential attack vectors of quantum computing against cryptocurrencies. The core conclusion is that the technical assumptions supporting the “threat remains distant” judgment have been systematically revised.

Following the white paper’s release, the crypto market experienced capital shifts. Zcash, which does not rely on the elliptic curve digital signature algorithm (ECDSA) that Google’s warning primarily targets, was viewed by the market as a potential quantum-safe asset. According to Gate data, as of April 21, 2026, Zcash’s price had increased by approximately 903.00% over the past year and about 44.71% in the last 30 days; Monero’s 30-day price showed minor fluctuations; Dash’s price remained well below its all-time high, with a one-year increase of about 67.92%, and a market cap of roughly $436 million.

Some market participants regard privacy coins—especially Zcash and Monero—as “Digital Gold 2.0” in the quantum era, believing their privacy features are inherently quantum-resistant. However, others argue this perception is flawed, as quantum computers threaten not only public key cryptography but could also retroactively crack on-chain private data.

The release of Google’s white paper may accelerate the timeline for global regulators and large enterprises to migrate to post-quantum cryptography. Industry analysts note that the quantum threat has risen from a peripheral topic to a core security agenda, and the window for institutional migration is shrinking.

From Theory to Countdown: The Quantum Threat

Reviewing key events from Q4 2025 to April 2026, a clear timeline of technological catalysts and capital responses has emerged.

December 2025: Grayscale released its annual outlook report, listing the potential threat of quantum computing to blockchain encryption methods as one of the two major themes for market attention in 2026.

February 2026: Zcash’s shielded transaction proportion reached 59.3%, nearly doubling from about 30% at the start of 2025. Ethereum co-founder Vitalik Buterin published a comprehensive post-quantum defense plan.

Early March 2026: Monero officially launched the FCMP++ upgrade, expanding the anonymous set to over 1.8 million outputs across the chain. In the same month, Foundry Digital announced the launch of a Zcash institutional mining pool. The Trump administration released a national cybersecurity strategy, first incorporating cryptocurrencies and blockchain into the national cyber defense framework, with post-quantum cryptography as a core focus.

March 30, 2026: Google’s Quantum AI team published the white paper, significantly lowering the estimated hardware resources needed for quantum cracking.

April 13, 2026: Zcash core developer ZODL released the latest strategic roadmap, listing post-quantum security as one of three core directions, and Zcash officially entered the “Zcash IV” phase. On the same day, Foundry launched Zcash mining pool operations, controlling about 30% of the total network hash rate.

April 15, 2026: Bitcoin core developers proposed BIP-361, aiming to freeze Bitcoin addresses not migrated to quantum-resistant ones. On the same day, Tron founder Justin Sun announced deploying NIST-standard post-quantum signature schemes on the mainnet.

April 18, 2026: ZODL and the Zcash Foundation urgently released security patches, fixing four vulnerabilities, with the majority of hash power pools completing deployment before disclosure.

April 20, 2026: Vitalik Buterin delivered a detailed Ethereum post-quantum roadmap at the Hong Kong Web3 Carnival, noting that current quantum-resistant signature algorithms on-chain consume about 200k gas, facing efficiency challenges.

Quantitative Comparison of Quantum Resistance in Zcash, Monero, and Dash

Market Performance and Liquidity Comparison

According to Gate data, as of April 21, 2026:

Zcash’s one-year growth far exceeds its peers, with a market cap approaching Monero’s, but its 24h trading volume is only about 3.9% of Monero’s, indicating a significant liquidity gap. Monero maintains the highest trading volume at $115.63 million and a market cap of $6.55 billion.

Technical Architecture and Quantum Resistance

The quantum threat to privacy coins differs from that faced by Bitcoin and Ethereum. The latter mainly worry about quantum computers cracking public key cryptography to steal assets, while privacy coins face an even more covert risk: quantum computers could retroactively crack on-chain private data, exposing historical transactions.

Zcash: Architecturally Innate Advantage

Zcash’s quantum resistance stems from its cryptographic design. Lead engineer Sean Bowe has pointed out that because Zcash avoids publishing public keys on-chain at the protocol level, its shielded transactions already provide post-quantum privacy protection in many common use cases.

This advantage arises because Zcash’s shielded transactions are verified via zero-knowledge proofs, which do not reveal public keys. Even if future quantum computers can crack elliptic curve cryptography, they cannot directly derive private keys from on-chain data, as no public keys are exposed.

Furthermore, Zcash’s post-quantum roadmap includes concrete projects. Project Tachyon’s “Obfuscated Synchronization” technology aims to remove ciphertext entirely from the blockchain, and the team is actively testing the NIST-finalized lattice-based standards. The post-quantum privacy upgrade is expected to be implemented by summer 2026.

Monero: Addressing the Shortcomings

Monero’s post-quantum defenses differ fundamentally from Zcash. Monero keeps public keys on-chain, meaning all historical transactions are vulnerable to retroactive cracking by quantum computers.

To counter this, Monero has initiated multiple upgrades. The FCMP++ upgrade activated early in 2026 replaces ring signatures with full-chain member proofs, expanding the ring size from about 16 to over 1.8 million outputs across the chain, achieving “forward secrecy”—even if future quantum computers crack elliptic curve cryptography, historical privacy remains secure.

Additionally, developers proposed the Jamtis address format draft, which incorporates CSIDH-based post-quantum encryption. Even if elliptic curve discrete logarithm problems are solved by quantum computers, the privacy of transactions linked to these addresses could still be protected. However, this scheme is still under consultation, with no fixed deployment date.

Dash: Lacking a Post-Quantum Roadmap

In this quantum security discussion, Dash appears almost absent. No public information indicates Dash has released a post-quantum cryptography roadmap or specific upgrade plans. Its core privacy technology relies on CoinJoin mixing, which still depends on traditional elliptic curve cryptography. Without a clear post-quantum migration plan, Dash’s quantum resistance is the weakest among the three.

Institutional Participation and Ecosystem Metrics

As of April 2026, institutional players are actively involved:

• Foundry Digital, a major Bitcoin mining pool operator, officially launched a Zcash mining pool, which has quickly grown to control about 30% of the total network hash rate. Foundry, controlling roughly 31% of global Bitcoin hash power, is seen as a significant institutional endorsement of Zcash.

• ZODL has raised $25 million in private funding, and Cypherpunk Technologies has acquired over $90 million worth of ZEC tokens. The recent peak in Zcash shielded mining pools shows about 31% of ZEC is held in mining pools, with network hash rate reaching 16.54 GS/s.

In contrast, Monero maintains high transaction activity and liquidity but has not seen institutional mining pools at the scale of Zcash. Dash’s institutional involvement metrics show no significant change.

Mainstream Narratives and Potential Divergences

Regarding “privacy coins’ post-quantum resistance,” three main narratives are circulating:

Zcash as a Naturally Post-Quantum Asset

This narrative argues that Zcash’s zk-SNARK architecture provides it with structural advantages against quantum threats. The core warning in Google’s white paper concerns the risk of elliptic curve signature algorithms being broken, but Zcash’s shielded transactions do not rely on this mechanism. Additionally, as the blockchain data size increases, Zcash’s encryption mechanisms may become even stronger—more shielded transactions mean larger anonymous sets, enhancing overall privacy. Coupled with institutional mining support and ZODL’s large funding, Zcash’s post-quantum narrative is grounded in both technology and capital.

Can Monero’s Upgrades Offset Architectural Disadvantages?

Some believe that the FCMP++ upgrade significantly enhances Monero’s quantum resistance, with full-chain member proofs providing industry-leading forward secrecy. Others argue that the fundamental issue of public keys being on-chain remains unaddressed, and future quantum computers could still retroactively crack on-chain data. The Jamtis address scheme is still under discussion, with no fixed timeline.

Dash’s Lack of Post-Quantum Narrative

This view notes that Dash’s silence amid rising quantum threat discussions is itself a signal. Its architecture lacks any announced post-quantum cryptography plans, and the effectiveness of CoinJoin mixing against quantum attacks remains unassessed publicly. The flow of institutional and developer resources is increasingly favoring Zcash and Monero.

Industry Impact Analysis: Structural Changes in Privacy Coin Competition

Institutional Capital as a Filtering Mechanism

Foundry’s choice of Zcash over other privacy coins to launch a mining pool reflects a clear institutional logic: Zcash’s support for selective disclosure aligns with compliance requirements, distinguishing it from competitors. In the context of the Trump administration integrating cryptocurrencies into national cybersecurity strategies and post-quantum cryptography becoming a policy priority, privacy coins with compliant frameworks and clear technical roadmaps are more likely to attract institutional resources.

The Matthew Effect in Development Activity

ZODL’s $25 million funding, Monero’s ongoing FCMP++ and Jamtis upgrades, and Dash’s near absence in post-quantum efforts illustrate a widening gap. The research indicates that migrating blockchain systems to post-quantum cryptography takes 3 to 5 years; early movers will have a significant time advantage.

Regulatory and Technological Interactions

While privacy coins have long faced regulatory pressures, the post-quantum narrative could alter this dynamic. As U.S. cybersecurity strategies explicitly prioritize post-quantum cryptography and include cryptocurrencies within the framework of technological sovereignty, projects that proactively adopt NIST standards may enjoy a more favorable regulatory environment.

Conclusion

In Q2 2026, the privacy coin sector is undergoing a structural transformation catalyzed by quantum threats. Zcash, with its architectural advantages, clear post-quantum roadmap, and institutional backing, leads the pack; Monero actively addresses its shortcomings through FCMP++ and Jamtis, maintaining its privacy leadership; Dash lags behind with no visible post-quantum plan.

From an asset security perspective, Zcash balances quantum resistance and institutional credibility; from a pure privacy technology standpoint, Monero’s full-chain anonymity set remains superior; Dash needs to clarify its post-quantum strategy promptly to meet market expectations.

Quantum threats are not a sudden “end-of-days” event but an ongoing technological contest. Projects that plan ahead will have more time for adjustments and greater security buffers. For market participants, continuously monitoring the actual implementation progress of each project’s post-quantum roadmap will be more valuable than relying solely on narrative labels.