TLDR
- Grayscale says blockchains should prepare now because quantum progress may arrive in sudden jumps.
- Google Quantum AI estimates 1,200 to 1,450 logical qubits may reach the cryptography threshold.
- Grayscale says post-quantum cryptography already exists and is in use across internet security.
- Solana and XRP Ledger are already testing post-quantum cryptography tools, according to Grayscale.
- Grayscale says Bitcoin faces a social choice over lost coins more than a technical barrier.
Grayscale says a new Google Quantum AI paper makes post-quantum cryptography an urgent issue for blockchains. The firm says public networks should not wait for a large quantum machine to appear. Instead, it says work should begin now because progress may come in sudden jumps.
The paper focuses on the risk to classical cryptography from future quantum computers. Grayscale says the path to stronger protection is already known. It points to post-quantum cryptography as the main route for public blockchain upgrades.
Google paper adds urgency to blockchain planning
Grayscale says Google Quantum AI presents a clear warning for blockchain communities. The paper says breakthroughs may come in “discrete jumps” rather than slow, steady steps. That could leave projects with less time than expected.
Google estimates that the threshold may require about 1,200 to 1,450 logical qubits. Grayscale says that figure places the finish line closer than many people assume. It adds that the timeline still remains uncertain.
Grayscale Research's analysis of the @Google Quantum AI paper suggests breakthroughs may come in sudden leaps, not gradual steps. That means preparation can’t be delayed.
The good news:
• Post-quantum cryptography already exists
• Some chains like $SOL and $XRP Ledger are… pic.twitter.com/r5vtnnWCJj— Grayscale (@Grayscale) April 6, 2026
The firm says delay could create avoidable risk for public chains. It notes that protocol changes often take time and broad agreement. That process can move slowly across large communities.
Grayscale also says the work goes beyond code changes alone. Networks may need engineering updates, user support, and coordination across developers. Some changes may also affect transaction speed and other system trade-offs.
Post-quantum tools already exist and some chains are testing them
Grayscale says the problem has a practical answer. It says blockchains need to adopt post-quantum cryptography to protect users and networks. The paper describes this field as mature and already tested.
According to Grayscale, these tools have been proposed, reviewed, implemented, and deployed. They already help secure internet traffic in some settings. That gives blockchain teams a base to build on.
The firm points to early work on public chains as well. It says Solana and the XRP Ledger are already experimenting with post-quantum cryptography. Those efforts show that testing has moved beyond theory.
Grayscale says adoption still requires careful design. Different chains use different models, and that affects how upgrades should work. Each network must match the tools to its own structure and rules.
Quantum risk varies by network and Bitcoin faces a governance test
Grayscale says quantum risk is not the same across all blockchains. It depends on the chain’s transaction model, consensus method, and smart contract use. Setup processes and block times also matter.
The paper notes that UTXO-based chains differ from account-based chains. It also separates proof-of-work systems from proof-of-stake systems. Grayscale says those differences shape the level and type of risk.
For Bitcoin, Grayscale says the technical side looks more manageable than on some other networks. Bitcoin uses a UTXO model and proof-of-work consensus. It also lacks native smart contracts.
Still, the firm says Bitcoin faces a hard social question. The community must decide how to treat coins with lost or inaccessible private keys. Options include burning them, leaving them untouched, or slowing their release.
Grayscale says those choices are technically possible. The challenge is community agreement, not system design alone. It notes Bitcoin’s record of sharp debates over protocol changes.
