Quantum and Crypto Roadmaps Compared: Bitcoin, Ethereum, Solana and Others
Comparison table
| Chain | Approach | Status in 2026 reporting |
|---|---|---|
| Bitcoin | BIP-360, Pay-to-Merkle-Root output type plus a migration proposal | Merged into the BIP repository February 11, 2026 (a draft, not active); a third-party company ran it on its own test network in March; activation estimates of 2027 to 2029 are speculative |
| Ethereum | Staged hard forks, account abstraction for quantum-safe authentication | Post-quantum hub launched March 2026; coverage describes several hard forks, with core post-quantum infrastructure targeted for around 2029 |
| Solana | Falcon research, optional Winternitz Vault, migrate new wallets first if threat becomes credible | No user action needed today, per the Solana Foundation |
| Algorand | FALCON signatures in State Proofs since 2022 | Native FALCON verification on the 2026 roadmap |
| Aptos | Proposal AIP-137 for a post-quantum signature option | Subject to token holder approval |
What the Falcon and Winternitz names mean
Falcon is a lattice-based signature scheme (related to the standards in ML-DSA). Winternitz signatures are hash-based one-time signatures, in the same family as SLH-DSA. See quantum resistant signatures.
The trade-off every chain faces
Post-quantum signatures are larger, which stresses block space and fees. Migrating existing wallets also needs users to move funds. Dormant coins whose owners are gone are a thorny problem.
Where this leaves a Solana token
Tokens like QNT depend on Solana's plans. Good habits help now: use a hardware wallet, avoid address reuse, keep software updated. See storing QNT safely.
Why it matters for the narrative
Every post-quantum step in crypto keeps the topic in headlines, see what governments and chains say.
What changed in the last 90 days
In our sources no major chain activated post-quantum signatures between July and October 2026. The context shifted instead: the US cryptography order (reported dates of 2030 for contractors and 2031 for agencies) and a verified logical-qubit demonstration on July 30 kept the subject in front of developers.
Signature size, explained with numbers you can check
Elliptic curve signatures used by most chains are tiny, around 64 bytes. Post-quantum signatures are bigger: Falcon-512 signatures are roughly 650 to 700 bytes and ML-DSA-44 about 2.4 kilobytes, per the published parameter sets. At 650 bytes, one signature is roughly ten times larger than 64 bytes. A block full of transactions therefore holds fewer of them, which is the trade-off every chain has to manage. The Solana Foundation says Falcon's compact signatures mean network performance is not expected to be meaningfully affected.
Comparison by user effort
| Chain | What a holder does today |
|---|---|
| Bitcoin | Nothing required. Avoid reusing addresses as general hygiene. |
| Ethereum | Nothing required. Watch the post-quantum hub. |
| Solana | Nothing required per the Foundation. The Winternitz Vault is optional. |
| Algorand and Aptos | Follow each project's announcements. |
Dated items to watch
- Foundation and developer posts on each chain, as published.
- January 1, 2027: the government compliance date that keeps the issue visible. See deadlines.
- Ethereum's stated target of around 2029 for core post-quantum infrastructure.
These are things to follow, not predictions. Nothing here is financial advice, and the QNT memecoin is independent of every project and company named.
A worked example: how a migration might unfold
Following the Solana Foundation's stated path, imagine three steps. Step one is research and testing of schemes such as Falcon. Step two, only if the threat becomes credible, is making a post-quantum option the default for new wallets. Step three is moving existing wallets, which needs the owner to act. Owners who lost keys or are gone cannot act, which is the dormant coin problem noted above. The roadmap deliberately starts with the easy cases first.
Questions to ask about any chain's plan
- Is there a written proposal with a number, such as BIP-360 or AIP-137?
- Is a test network or reference implementation running?
- Does it say who has to do what, and by when?
- Who decides: developers, validators, token holders or all three?
A plan with a proposal number, a test and a decision process is further along than one with only a blog post. See also post-quantum cryptography and crypto.
Sources and further reading
- Solana: quantum readiness
- Sanctum: Solana and quantum computing guide
- BlockEden: NIST and blockchain migration
- Solana Foundation: quantum readiness (read for client teams and roadmap)
Dates as listed 2026-10-09. Conferences move, so confirm on the organizer's site before planning.
Frequently asked questions
Which blockchain is most quantum ready?
Algorand has used FALCON in State Proofs since 2022. Others are at proposal or research stages. Readiness depends on what you measure.
Is Bitcoin changing for quantum?
BIP-360 was merged into the BIP repository in February 2026, but activation needs broad consensus.
What is the Solana Winternitz Vault?
An optional hash-based signature wallet feature for protecting individual funds. It does not change the protocol.
Do I need to move my tokens now?
The Solana Foundation says no action is needed today. Follow its announcements.
Why are post-quantum signatures bigger?
The math behind them needs more data to be secure against quantum attacks.
Which scheme does Solana lean toward?
Anza and Firedancer both chose Falcon for initial implementations, per the Solana Foundation.
Can I use the Winternitz Vault today?
It exists as an optional feature from Blueshift. Research its risks before using any new wallet tool.
Keep reading
- What Governments and Blockchains Are Saying About Quantum and Crypto
How Solana, Bitcoin and Ethereum are responding to the quantum threat in 2026, and how it links to government post-quantum policy. - Will Quantum Computers Break Bitcoin and Solana?
A calm, factual look at the quantum threat to Bitcoin, Solana and other blockchains, what is safe now, and what could change. - Post-Quantum Cryptography and Crypto: What It Means
Why large quantum computers could threaten blockchain signatures, and what post-quantum cryptography is doing about it. - Solana Token Standards: SPL Token vs Token-2022
Solana tokens use either the original SPL Token program or the newer Token-2022 program with extensions. Learn the differences and what it means for QNT.
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