5 Blockchains Built for the Post-Quantum Era

It’s been half a century since quantum computing was first proposed. But for most of blockchain’s history, the idea of quantum computers breaking cryptography wasn’t anything more than a distant science-fiction problem.

That is no longer the case, though. The question isn’t whether relevant quantum computers will arrive, but rather when and whether critical systems will be ready in time.

From cloud infrastructure, government systems, and modern finance to blockchain networks, all of them rely on the same cryptographic foundations: public-key systems such as RSA ECC. And a sufficiently powerful quantum computer running Shor’s algorithm could easily break them.

על פי 2025 ISACA Quantum Computing Pulse Poll that surveyed global cybersecurity, IT, audit, and risk professionals, 62% of respondents worry that quantum computing will break today’s internet encryption, but an overwhelming majority (95%) said their organizations do not have a defined quantum computing roadmap. Other דיווחים have raised similar concerns about the “Q-Day,” believing that a cryptographically relevant quantum computer (CRQC) will להפוך למציאות within 5 to 10 years.

Research also finds that most businesses lack systems resistant to quantum threats. According to the National Institute of Standards and Technology (NIST), quantum computers would eventually break today’s encryption systems, prompting it to finalize post-quantum cryptography (PQC) standards and urge organizations to begin migration immediately. While most of the world is still unprepared, blockchains have already begun exploring solutions.

For instance, Bitcoin, one of the most exposed major chains due to its heavy dependence on ECDSA and Schnorr/Taproot signatures, has taken a meaningful first formal step with BIP 360, in addition to discussions around “Post Quantum Migration and Legacy Signature Sunset".

Meanwhile, the Ethereum Foundation has made post-quantum security a strategic priority, with dedicated teams, live development networks, and targeted research funding.

Founder Vitalik Buterin has also outlined migration pathways involving post-quantum signatures and broader protocol redesign due to the reliance of the broader network, i.e., smart contracts, DeFi infrastructure, validator systems, and account abstraction, on cryptographic assumptions that must eventually change.

Even Solana is ניסויים with quantum-resistant cryptography, but early tests are showing a tradeoff between security and speed. Quantum-safe signatures could slow the network by up to 90%.

While the leading blockchains are actively pursuing post-quantum pathways, they are not yet quantum-proofed, and reaching that stage will take time and community consensus. But there are blockchains already built on a quantum-resistant foundation.

1. Quantum Resistant Ledger (QRL )

One of the most prominent examples of a blockchain built specifically for the post-quantum era is קוונטית עמיד לדג 'ר. Unlike most chains out there, this one was created from day one with quantum resistance as its core design principle.

Instead of choosing ECDSA, QRL chose a hash-based signature model that does not rely on discrete logarithm assumptions that Shor’s algorithm breaks, thus avoiding the main vulnerability threatening classical crypto wallets.

It was launched using XMSS (eXtended Merkle Signature Scheme), one of the earliest NIST-recognized post-quantum signature schemes, which is specifically designed to resist quantum attacks and has undergone rigorous examination and validation.

Last year, the project הודיע its transition from stateful XMSS to NIST-standardized SLH-DSA/SPHINCS+ (FIPS 205) to eliminate state-management risks and simplify development.

This shift to a stateless hash-based signature scheme improves side channel attack resistance compared to XMSS, provides a more resilient security model, and ensures long-term reliability. “By going stateless, QRL Project Zond removes this systemic risk, important for institutional partners like exchanges and custody providers,” noted QRL at the time.

The public, open-source platform started as a Proof-of-Work in 2018, but in recent years, it has started moving towards a Proof-of-Stake (POS) network.

Last month, the Quantum Resistant Ledger team הציג a PoS Layer 1 architecture, the Quantum Resistant Virtual Machine (QRVM), which is EVM-friendly, and Hyperion, a post-quantum smart contract language derived from Solidity. While QRL-specific tooling is required for deploying Hyperion contracts, existing Ethereum tooling can also be adapted with minimal modifications.

By preventing the complexity of retrofitting a decade-old architecture, as the likes of Bitcoin and Ethereum are doing right now, QRL avoids any legacy migration problems and offers the strongest quantum defense. Building wallet signatures, network assumptions, and protocol design with post-quantum assumptions makes QRL a truly quantum-native blockchain.

Its native token, QRL, has a $96.6 million market cap and is currently trading at $1.35, up 326% in the past year but down about 67% from its all-time high (ATH) of $4.17 hit in January 2018, according to CoinMarketCap.

The token is used to make transfers, multi-signature transactions, and create digital assets.

2. אלגורנד (ALGO )

Algorand is among the blockchain networks that are designed with quantum resistance in mind. Having cryptographic agility built into its consensus mechanism and signature scheme means the network can easily swap the underlying primitives as standards evolve, without needing to rebuild from scratch.

What makes Algorand different from other quantum-proofed networks is that it’s not a niche “quantum-only” chain; rather, it is a major Layer 1 that is used across payments, tokenization, DeFi, and institutional blockchain deployments.

Algorand has also been recognized by Coinbase as better positioned to survive the new era. In its first formal הערכה of blockchain security, Coinbase’s quantum computing advisory board, which was formed earlier this year to evaluate the implications of quantum computing for the ecosystem and provide clear guidance, noted that the core infrastructure of Bitcoin is “largely safe” and “the real vulnerability is wallet-level.”

According to the assessment, PoS chains may be at a greater risk of future quantum computing attacks. These chains have exposure risks in the signature schemes validators that are used to secure the network, and thus may have to redesign parts of the core consensus mechanism itself. But of course, not every chain is hit the same way.

“Algorand is among the first blockchain platforms to deploy post-quantum (PQ) signature schemes in production across both consensus-related mechanisms and the execution layer,” stated the report.

The blockchain platform has been following a staged roadmap toward full quantum readiness. At the consensus level, its state proof framework employs NIST-approved FALCON signatures to produce quantum-resistant attestations of blockchain state. This is done by compressing about 256 rounds of block headers into concise certificates verifiable by light clients and external chains.

Algorand has actually been a leader in deploying Falcon signatures, and their implementation secures the integrity of the chain’s entire history against future quantum attacks.

אבל כמו Coinbase noted, core consensus operations are still, in part, reliant on classical cryptography and vulnerable to quantum attacks. These limitations have been acknowledged by Algorand, and the team is actively researching approaches to secure the consensus core as well.

Meanwhile, at the transaction layer, cryptographic tools necessary to support quantum-safe accounts are provided. Recently, the network executed the first post-quantum transaction on mainnet using Falcon signatures, extending post-quantum protection beyond research and into live asset settlement.

With a market cap of $960.5 million, its native currency ALGO ranks among the top 100 crypto assets. At the time of writing this, ALGO has been trading at $0.1174, up 39% in the past month but down 49% in the past year. The token has actually lost 96.4% of its value from its ATH of $3.28, reached about seven years ago.

Click here to learn all about investing in Algorand (ALGO).

3. חדרה (HBAR )

Yet another blockchain with one of the strongest quantum-resistant architectures is Hedera, which has devised a clear path to full post-quantum security.

This starts with a hashgraph consensus algorithm that is post-quantum secure and eliminates the need for deep protocol redesigns, hard forks, and major ecosystem migrations. Making signature replacement comparatively straightforward gives Hedera a major advantage over many traditional blockchains.

The network’s consensus and integrity layers already use strong primitives such as SHA-384 hashing and AES-256, aligned with quantum-resistant security assumptions.

SHA-384 is used by Hedera to link hashgraph history and verify data integrity, and while the BHT quantum algorithm would impact its security somewhat (reduce it to around 128 bits), it will still remain secure. Meanwhile, AES-256 is used within TLS for encrypted transport, and Grover’s quantum algorithm would only reduce its effective security to about 128 bits, which is also considered secure.

The biggest issue with Hedera is account signatures. It still uses ECDSA and Ed25519 for account keys and transaction signatures, and these digital signature schemes are not quantum safe. This means user account signatures are still exposed under a future cryptographically relevant quantum computer (CRQC), just like most of the industry.

כמו הצוות ציין, “parts of Hedera’s cryptographic stack are already post-quantum, while other parts need deliberate migration.”

Network signing occurs during live consensus, and it matters in real time to establish agreement. Upgrading them to post-quantum algorithms will protect the integrity of the consensus process and ensure the long-term verifiability of the ledger’s history.

While this infrastructure change doesn’t require action from end users, user keys that authorize token operations, transfers, and smart contract calls require coordination with not just users but also wallets, custodians, and SDK maintainers across the ecosystem. Post-quantum account key types will let users and wallet providers migrate on their own schedule.

Post-quantum signatures are key to full end-to-end post-quantum security. And Hedera has repeatedly stated that once NIST finalizes practical standards, it will integrate those systems algorithms into the network.

Another major advantage of Hedera is its governance structure, which includes a 39-node council comprising Google, IBM, and Boeing. So, security upgrades can get audited and deployed without the coordination chaos that will likely stall Bitcoin’s response.

Hedera has also שותף with SEALSQ on its quantum-resistance chip, QS7001, which embeds Dilithium keys in hardware.

Its native token, HBAR, is the 27th-largest cryptocurrency, with a market cap of $3.94 billion. As for price, it is currently מסחר ב $ 0.092, down 53% over the past year and 84% from the peak of $0.5692 reached in Sept 2021.

לחץ כאן כדי ללמוד הכל על השקעה בהדרה האשגרף (HBAR).

4. Cellframe (CELL )

This modular blockchain is built from scratch around post-quantum security. In its cybersecurity-first architecture, Cellframe incorporates PQC techniques for both security and scalability, as well as for implementing complex decentralized services.

Interestingly, the platform supports the development of dApps using conditional transactions that enable on-chain service payments without smart contracts.

Rather than focusing purely on cryptocurrency, the project aims to support dApps, marketplaces, storage systems, and enterprise infrastructure while remaining secure in a quantum era.

For post-quantum security, Cellframe employs NIST-approved post-quantum cryptographic algorithms, including Falcon, CRYSTALS-Dilithium, and the post-quantum key encapsulation mechanism Kyber512. This protects the network and all the mechanisms built on it from the threat of quantum computers.

To further strengthen the protocol’s quantum-secure capabilities, the team is also researching the post-quantum aggregated Chipmunk signature and the NTRU Prime key-encapsulation mechanism.

Most recently, the project even announced cBTC, a quantum‑resistant hedge for Bitcoin on the Cellframe platform.

In preparation for a quantum-secure future, Cellframe has also introduced a two-way bridge to facilitate the transfer of assets into blockchains that have implemented post-quantum cryptographic measures into their source code.

As for scalability, it takes a two-tier approach with an L0 infrastructure and sharding. Its two-layer sharding optimizes load distribution: the first layer comprises separate blockchains for services, while the second layer segments the network into identical cells to accelerate transaction flow and mitigate congestion.

Designed for high throughput and heterogeneous network support, the protocol enables handling increasing transaction volumes without performance bottlenecks.

Its native cryptocurrency, CELL, is a low-cap coin, having a market cap of just $1.86 million as it trades at $0.50, down over 84% in the past year and more than 99% from its ATH of $7.21, recorded in March 2021. While the coin has primarily been trending down, it does enjoy brief rallies now and again. Recently, the CELL price surged from $0.041 to $0.095, a 131% increase in just two days.

5.IOTA (IOTA )

It’s been more than a decade since IOTA was launched as an open-source distributed ledger and cryptocurrency designed to secure Internet of Things (IoT) data transmissions.

But what made it quantum-resistant was IOTA’s early adoption of Winternitz one-time signatures (W-OTS), a hash-based signature scheme designed to mitigate vulnerabilities in elliptic-curve cryptography.

While most traditional blockchains use a standard chain structure, IOTA was built around the tangle, a directed acyclic graph (DAG)-based distributed ledger, for scalability and security, to support IoT infrastructure and low-fee microtransactions.

IOTA’s use of hash-based signatures was one of the earliest examples of blockchain developers explicitly designing around post-quantum concerns. Like XMSS, W-OTS avoids the discrete logarithm problem and therefore resists the core quantum-attack model that ECC systems face.

However, the project’s challenge has been balancing usability with security, since one-time signatures create operational complexity for users and wallet management. So, in 2021, the שדרוג גולם switched to Ed25519 (Edwards-curve Digital Signature Algorithm) to improve security and usability, but it isn’t quantum-safe.

But in light of the emerging threat posed by quantum computing, the project has released IOTA Identity v1.7. This update specifically added support for several post-quantum digital signature algorithms to ensure the integrity and authenticity of digital credentials.

לפי IOTA’s official announcement:

“IOTA Identity 1.7 Beta ensures credentials issued today stay secure in the future. It introduces post-quantum and hybrid signatures for Verifiable Credentials, developed with the LINKS Foundation. It also adds onchain public credentials for transparency and streamlined key handling, making digital identity more efficient, interoperable, and ready for real-world adoption.”

IOTA Identity supports PQC for digital credentials, specifically for Verifiable Credentials (VCs) and Verifiable Presentations (VPs) using newer quantum-resistant signature schemes such as ML-DSA, SLH-DSA, and FALCON.

By combining a traditional signature algorithm with a newly developed PQC algorithm, the team noted that hybrid signatures enable a smooth, phased migration. They keep signatures secure against current threats while providing forward secrecy against future quantum computer attacks. More importantly, organizations can adopt them now and substantiate the PQC component in real-world settings.

As of writing, IOTA, with a $252.8 million market cap, is trading at $0.0592, down 70% over the past year and 98.9% from its peak of $5.25 in December 2017. According to CoinGecko, the token actually hit its all-time low of $0.05222 in March 2026.

Click here to learn all about investing in IOTA (IOTA).

סיכום

The quantum threat is very real, especially for blockchains, as most major networks still rely heavily on elliptic-curve signatures. The mathematics currently securing banks, governments, cloud systems, and crypto wallets will not remain secure forever. Preparation must happen before the break arrives.

Per Google’s projections, cryptographically relevant quantum computers could arrive sooner than expected, which means the crypto industry needs to move fast to address this inevitability.

For blockchains, the challenge is greater because security upgrades require social consensus, protocol coordination, and, often, politically difficult hard forks. But projects like QRL, Cellframe, IOTA, Hedera, and Algorand show that it’s possible, offering different paths to protection against quantum threats.

While some are designed to be quantum-safe from the ground up, others are proving that large-scale migration is possible without rebuilding from scratch. As quantum resistance moves from a niche feature to a baseline expectation, the projects that adapt earliest and most effectively will be the ones that remain secure and earn long-term user trust in the next era of digital infrastructure.