Aptos is taking an early step toward future-proofing its network by proposing optional post-quantum signature support, signaling that quantum computing risks are now being treated as a long-term engineering challenge rather than a distant theory.

The proposal reflects a growing view among blockchain developers that waiting until quantum computers become immediately threatening may be too late. While current cryptographic systems remain secure today, the concern is that sufficiently advanced quantum machines could eventually undermine widely used digital signatures, potentially exposing historical transactions and account ownership.

Key Takeaways

• Aptos has proposed an optional post-quantum signature scheme to address long-term cryptographic risks

• The proposal would introduce a new account-level signature option without affecting existing users

• Aptos would become one of the first production blockchains to support post-quantum accounts

To address that risk, Aptos developers have introduced a new improvement proposal that would allow accounts to adopt quantum-resistant signatures. Rather than replacing existing cryptography, the change would give users the option to upgrade selectively, preserving backward compatibility while opening a path to stronger security models.

How the Post-Quantum Option Works

At the center of the proposal is support for a hash-based signature standard known as SLH-DSA, which has been formalized under U.S. federal cryptography guidelines. If approved through governance, this signature type would become an alternative account format on Aptos, available to users who want additional protection against future cryptographic breakthroughs.

Crucially, nothing changes by default. Existing accounts would continue to operate as they do today, and users would only encounter the new system if they choose to opt in. This design avoids disruption while allowing early adopters — such as institutions or long-term asset holders — to prepare well in advance.

If implemented, Aptos would be among the first major production blockchains to natively support post-quantum account security, rather than testing it in isolated environments.

Why Networks Are Acting Before the Threat Is Immediate

The move comes amid broader momentum around post-quantum cryptography. Governments and standards bodies have accelerated work on quantum-resistant algorithms, and large technology firms have publicly discussed progress in quantum hardware scaling. While practical attacks remain hypothetical, the direction of travel is increasingly clear.

Other blockchain ecosystems are exploring similar paths. Solana has already experimented with quantum-resistant transaction formats on a test network, and within the Bitcoin community, proposals to add optional post-quantum signatures are gaining attention, though consensus remains distant.

pro-tip for quantum FUD promoters. bitcoin does not use encryption. get your basics right or it's a tell.

— Adam Back (@adam3us) December 18, 2025

Not everyone agrees on the urgency. Some prominent figures argue that quantum concerns are overstated in the near term and that existing systems are more resilient than critics suggest. Still, the growing number of networks preparing early indicates a shift in mindset — from debating if quantum computing matters to planning for when it eventually will.

For Aptos, the proposal is less about imminent danger and more about architectural foresight. By introducing post-quantum support as an option rather than a mandate, the network is positioning itself to evolve alongside cryptography standards, without forcing users into abrupt transitions.

Whether or not quantum machines arrive on aggressive timelines, Aptos’ approach reflects a broader trend: blockchain security is increasingly being designed with decades, not just years, in mind.