Quantus, a Layer 1 blockchain designed with post-quantum cryptography integrated from its foundation, has published a new research report titled “The State of Quantum: What Crypto Can’t Afford to Ignore.” The report warns that continued progress in quantum computing may be accelerating the timeline toward a potential cryptographic vulnerability threshold for the broader cryptocurrency ecosystem, which is currently valued at approximately $2.7 trillion. It assesses a growing disparity between advances in quantum computing and the preparedness of the crypto industry across key participants including wallets, exchanges, custodians, validators, developers, and end users.
The report argues that the digital asset sector may be entering a phase in which technological risk is advancing faster than institutional and technical responses. It highlights improvements in quantum error correction, gate fidelity, and resource estimation for cryptanalysis, which have collectively reduced prior assumptions about the computational requirements needed to threaten widely used public-key cryptography.
Most major blockchain systems continue to rely on elliptic-curve-based signature schemes such as ECDSA and Ed25519, which are theoretically vulnerable to Shor’s algorithm once sufficiently powerful quantum hardware becomes available. The report also notes that public keys recorded on-chain remain permanently visible, while repeated address usage and legacy wallet structures have contributed to a persistent exposure surface within older blockchain systems. Unlike conventional internet infrastructure, which can more easily rotate cryptographic primitives through software updates, blockchain networks face additional constraints due to decentralized governance structures and user-controlled asset custody, where sensitive key material may remain exposed indefinitely.
“Crypto does not get a clean warning bell before Q-Day,” said Christopher Smith, CEO and of Quantus in a written statement. “If the industry waits until the threat is obvious, users will be asked to move value under pressure. The safer path is to build and migrate before that pressure arrives,” he added.
The analysis also examines the potential impact of transitioning major blockchain networks, including Bitcoin, to post-quantum cryptographic standards. It notes that a typical ECDSA transaction contains approximately 97 bytes of signature and public key data, while an equivalent transaction using ML-DSA-87 would expand to roughly 7,187 bytes, representing an increase of about 74 times. Such an expansion would significantly reduce transaction throughput per block unless fundamental changes are made to underlying blockchain architecture. Proposals such as BIP 360, which introduces a new post-quantum address format, are discussed as potential migration pathways. However, the report highlights unresolved challenges, including increased block space demand, limited hardware wallet compatibility, and the continued exposure of un-migrated funds. It concludes that no single proposal currently addresses all of these constraints simultaneously.
The report further frames post-quantum cryptography as introducing a new version of the blockchain scalability trade-off. Larger cryptographic signatures increase storage and bandwidth requirements, while certain privacy-preserving mechanisms may introduce additional computational overhead. The resulting scalability constraints determine whether blockchain networks can adopt quantum-resistant security while maintaining functional performance. It also notes that not all zero-knowledge proof systems are resistant to quantum attacks, with elliptic-curve-dependent constructions such as Groth16, PLONK with KZG commitments, and Bulletproofs identified as vulnerable, while hash-based systems such as STARKs and FRI are considered more resilient.
Quantus’ accompanying technical materials describe architectural approaches intended to mitigate these constraints, including Wormhole Addresses built using Plonky2, STARK-based proof aggregation, and Poseidon2 hashing, with the goal of shifting verification processes off-chain and reducing the effective storage burden of post-quantum transactions. The report emphasizes that achieving post-quantum security at scale depends not only on cryptographic strength but also on maintaining blockchain efficiency under significantly larger data requirements. It further notes that exposure extends beyond individual wallets to include stablecoin administrative keys, bridge validators, oracle systems, multisignature custody structures, and governance contracts, where compromise could have cascading effects across decentralized financial markets.
The concept referred to as the “Great Quantum Filter” is introduced as a potential transition phase in which capital may migrate from vulnerable blockchain systems to those designed with quantum-resistant architectures. The report suggests that legacy networks would face complex upgrade processes involving protocol changes, wallet migration, exchange coordination, and user education, all under uncertain timelines. In contrast, quantum-native systems would avoid this transition burden by design, having implemented post-quantum signatures and architectures without reliance on exposed public keys from inception.
The report also references the formalization of post-quantum cryptographic standards by NIST in 2024, noting their gradual adoption across mainstream internet infrastructure such as Signal, Chrome, and iMessage. Despite the availability of similar standards for blockchain systems, adoption within the crypto industry remains limited, particularly among wallets, exchanges, and custodial services. The report concludes that delayed implementation may increase the likelihood that any transition toward post-quantum security occurs under reactive and high-pressure conditions rather than through coordinated planning.
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