# The Hardy Index

> The independent quantum-readiness benchmark for blockchains. The Hardy Index scores how prepared each major blockchain is for the quantum-computing threat, using a public six-dimension rubric and a five-tier readiness spine.

The Hardy Score runs from 0 to 100 and measures quantum readiness only, not investment merit, liquidity, adoption or general security. Every dimension score on this site carries a note and a link to a primary source. The complete rubric is published before the scores, and every change is logged.

- Current dataset: 23 chains, as of 12 August 2026.
- Methodology version: 1.1.
- This is a security-readiness assessment, not investment advice.
- Cite as: The Hardy Index, https://hardyindex.com, as of 12 August 2026.

Every page on this site has a Markdown mirror at the same path with a `.md` extension.

## Current ranking

1. Quantum Resistant Ledger (QRL): Hardy 92.0, Tier 1 Native
2. Abelian (ABEL): Hardy 84.5, Tier 1 Native
3. Nervos CKB (CKB): Hardy 75.5, Tier 2 Shipping
4. Algorand (ALGO): Hardy 74.5, Tier 2 Shipping
5. Solana (SOL): Hardy 54.5, Tier 2 Shipping
6. XRP Ledger (XRP): Hardy 46.5, Tier 3 Committed
7. Sui (SUI): Hardy 45.5, Tier 3 Committed
8. Hedera (HBAR): Hardy 42.0, Tier 3 Committed
9. Stellar (XLM): Hardy 41.0, Tier 3 Committed
10. Zcash (ZEC): Hardy 41.0, Tier 3 Committed
11. Aptos (APT): Hardy 40.5, Tier 3 Committed
12. Polkadot (DOT): Hardy 40.5, Tier 3 Committed
13. Ethereum (ETH): Hardy 40.0, Tier 3 Committed
14. Cardano (ADA): Hardy 37.5, Tier 3 Committed
15. BNB Chain (BNB): Hardy 22.5, Tier 4 Debating
16. IOTA (IOTA): Hardy 21.0, Tier 4 Debating
17. Tron (TRX): Hardy 18.5, Tier 4 Debating
18. Bitcoin (BTC): Hardy 17.0, Tier 4 Debating
19. TON (TON): Hardy 13.0, Tier 5 Exposed
20. Litecoin (LTC): Hardy 12.5, Tier 5 Exposed
21. Dogecoin (DOGE): Hardy 11.0, Tier 5 Exposed
22. Avalanche (AVAX): Hardy 10.5, Tier 5 Exposed
23. Hyperliquid (HYPE): Hardy 7.0, Tier 5 Exposed

## The index

- [The Hardy Index](https://hardyindex.com/index.md): The ranked benchmark, the five-tier spine and the dimension weights.
- [Methodology](https://hardyindex.com/methodology.md): The complete rubric, the 0 to 10 anchors for every dimension band, the calculation, and the stated limits of the rubric.
- [Chain profiles](https://hardyindex.com/chains.md): Every rated chain, grouped by readiness tier, with score, rank and summary.
- [Changelog](https://hardyindex.com/changelog.md): Every score change, methodology revision and correction, dated and sourced.
- [About and neutrality statement](https://hardyindex.com/about.md): Who runs the index, how it is funded, and the neutrality commitments that govern it.
- [How we make money](https://hardyindex.com/how-we-make-money.md): What earns, what never earns, and how the separation between the two is enforced.

## Guides

Plain-language answers to the questions people ask about the quantum threat to crypto, written by the same publication as the ratings. Guides carry disclosed affiliate links where they recommend a product; ratings never do. See https://hardyindex.com/how-we-make-money.md.

- [Guides index](https://hardyindex.com/guides.md): Every guide, grouped by whether it explains the threat, what to do about it, or which chains are ready.
- [Is my crypto safe from quantum computers?](https://hardyindex.com/guides/is-my-crypto-safe-from-quantum-computers.md): The calm answer: no machine can break your wallet today, but few chains are ready. See how the one you hold scores on an independent readiness index.
- [Will quantum computers break Bitcoin?](https://hardyindex.com/guides/will-quantum-computers-break-bitcoin.md): In theory yes, in practice not yet. How the attack would work, how exposed Bitcoin is today, and what BIP-360 does and does not fix.
- [Q-Day: when will quantum computers break crypto?](https://hardyindex.com/guides/q-day-when-will-quantum-break-crypto.md): Nobody knows the date, but the estimates have a shape. The expert ranges, the standards deadlines, and why the forecasts keep moving closer.
- [Harvest now, decrypt later: what it means for your crypto](https://hardyindex.com/guides/harvest-now-decrypt-later.md): Why a quantum attack years away already affects your wallet today, which coins it applies to, and the two habits that reduce your exposure now.
- [How to protect your crypto from quantum computers](https://hardyindex.com/guides/how-to-protect-crypto-from-quantum-computers.md): Four steps that cut your quantum risk today, what a wallet can and cannot fix, and how to check whether the chain you hold is actually ready.
- [Quantum-safe wallets: what is real and what is marketing](https://hardyindex.com/guides/quantum-safe-wallets.md): What actually makes a wallet quantum-safe, why most quantum-ready claims describe the device and not your coins, and the options worth considering.
- [Moving to a quantum-ready chain](https://hardyindex.com/guides/moving-to-a-quantum-ready-chain.md): Which layer-1 chains rate highest for quantum readiness, how a move actually works, what it costs you, and when staying put is the better call.
- [Which is the most quantum-resistant blockchain?](https://hardyindex.com/guides/most-quantum-resistant-blockchain.md): The independently rated answer, with scores. Which layer-1 chains run post-quantum signatures today, and how each one is judged across six dimensions.
- [Which crypto is quantum proof?](https://hardyindex.com/guides/which-crypto-is-quantum-proof.md): Very few, and the label is a spectrum rather than a badge. The chains running post-quantum signatures today, independently rated and sourced.

## Chain profiles

- [Is Quantum Resistant Ledger quantum-safe?](https://hardyindex.com/chains/qrl.md): Hardy 92.0, Tier 1: Native. The only chain in the index where a post-quantum signature is mandatory for every account on mainnet, and has been since 2018.
- [Is Abelian quantum-safe?](https://hardyindex.com/chains/abelian.md): Hardy 84.5, Tier 1: Native. A lattice-based privacy chain that has run post-quantum signatures and key encapsulation on mainnet since 2022, built on primitives inspired by CRYSTALS-Dilithium and Kyber.
- [Is Nervos CKB quantum-safe?](https://hardyindex.com/chains/nervos-ckb.md): Hardy 75.5, Tier 2: Shipping. An audited SPHINCS+ lock script is deployed on CKB mainnet, so users can hold funds under a NIST-standardised post-quantum signature today without a hard fork.
- [Is Algorand quantum-safe?](https://hardyindex.com/chains/algorand.md): Hardy 74.5, Tier 2: Shipping. Falcon-signed State Proofs have secured Algorand's history since 2022 and Falcon-signed transactions have run on mainnet since November 2025, with broad resilience targeted for end-2027.
- [Is Solana quantum-safe?](https://hardyindex.com/chains/solana.md): Hardy 54.5, Tier 2: Shipping. A quantum-resistant Winternitz vault has run on Solana mainnet for over two years, but protocol-level migration to Falcon is explicitly conditional and carries no published dates.
- [Is XRP Ledger quantum-safe?](https://hardyindex.com/chains/xrp-ledger.md): Hardy 46.5, Tier 3: Committed. A dated four-phase roadmap targets full post-quantum transition by 2028, with ML-DSA already deployed on AlphaNet and a Q-Day contingency plan defined.
- [Is Sui quantum-safe?](https://hardyindex.com/chains/sui.md): Hardy 45.5, Tier 3: Committed. Committed in August 2026 to two finalised NIST schemes, with a migration path that lets existing accounts move to quantum-safe keys without changing their addresses.
- [Is Hedera quantum-safe?](https://hardyindex.com/chains/hedera.md): Hardy 42.0, Tier 3: Committed. Published a phased post-quantum migration roadmap in April 2026, targeting a new post-quantum key type for users in 2027 with existing keys continuing to work.
- [Is Stellar quantum-safe?](https://hardyindex.com/chains/stellar.md): Hardy 41.0, Tier 3: Committed. A published Quantum Preparedness Plan whose first stage adds ML-DSA verification to Soroban as native host functions, letting contract accounts authenticate with quantum-safe keys.
- [Is Zcash quantum-safe?](https://hardyindex.com/chains/zcash.md): Hardy 41.0, Tier 3: Committed. Privacy is not quantum safety: Zcash spends are authorised by elliptic-curve signatures, though ZIP 2005 adds a quantum recovery path for shielded notes ahead of a full transition.
- [Is Aptos quantum-safe?](https://hardyindex.com/chains/aptos.md): Hardy 40.5, Tier 3: Committed. Proposed SLH-DSA-SHA2-128s for transaction signatures as an opt-in scheme, accepting signatures 82 times larger than Ed25519 in exchange for minimal new security assumptions.
- [Is Polkadot quantum-safe?](https://hardyindex.com/chains/polkadot.md): Hardy 40.5, Tier 3: Committed. The Web3 Foundation published a post-quantum roadmap covering Polkadot and JAM, naming Dilithium for consensus signatures and Falcon for accounts.
- [Is Ethereum quantum-safe?](https://hardyindex.com/chains/ethereum.md): Hardy 40.0, Tier 3: Committed. A dedicated Ethereum Foundation post-quantum team formed in January 2026, with hash-based validator signatures in weekly devnets and core infrastructure targeted for around 2029.
- [Is Cardano quantum-safe?](https://hardyindex.com/chains/cardano.md): Hardy 37.5, Tier 3: Committed. Cardano Vision 2026 makes post-quantum security one of three strategic pillars, with named research deliverables running from primitive assessment to a published migration SIP.
- [Is BNB Chain quantum-safe?](https://hardyindex.com/chains/bnb-chain.md): Hardy 22.5, Tier 4: Debating. Tested ML-DSA-44 signatures on its own network and published the cost honestly: throughput fell around 40 per cent and blocks grew nearly eighteenfold.
- [Is IOTA quantum-safe?](https://hardyindex.com/chains/iota.md): Hardy 21.0, Tier 4: Debating. Widely described as quantum-resistant on the strength of a scheme it removed in 2021; IOTA's layer 1 has signed with Ed25519 since Chrysalis and post-quantum support exists only in IOTA Identity.
- [Is Tron quantum-safe?](https://hardyindex.com/chains/tron.md): Hardy 18.5, Tier 4: Debating. Signs with ECDSA on secp256k1 and has announced an intention to deploy NIST post-quantum signatures on mainnet, but we could not confirm dated milestones from a primary source.
- [Is Bitcoin quantum-safe?](https://hardyindex.com/chains/bitcoin.md): Hardy 17.0, Tier 4: Debating. Two post-quantum BIPs reached Draft status in February 2026, but neither introduces a post-quantum signature, no activation path is agreed, and roughly a third of supply sits in addresses with exposed public keys.
- [Is TON quantum-safe?](https://hardyindex.com/chains/toncoin.md): Hardy 13.0, Tier 5: Exposed. Signs with Ed25519 and has no published post-quantum roadmap, though its wallet-as-smart-contract model means a new signature scheme could be adopted without changing the protocol.
- [Is Litecoin quantum-safe?](https://hardyindex.com/chains/litecoin.md): Hardy 12.5, Tier 5: Exposed. A Bitcoin-derived chain using ECDSA on secp256k1 with no published post-quantum roadmap, though its MWEB soft fork proves it can enact consensus changes Bitcoin has not managed.
- [Is Dogecoin quantum-safe?](https://hardyindex.com/chains/dogecoin.md): Hardy 11.0, Tier 5: Exposed. A Bitcoin-derived chain using ECDSA on secp256k1, with no published post-quantum roadmap and the same governance difficulty Bitcoin faces without the same research effort.
- [Is Avalanche quantum-safe?](https://hardyindex.com/chains/avalanche.md): Hardy 10.5, Tier 5: Exposed. Signs with ECDSA on secp256k1 across its chains, with no published post-quantum roadmap found at the time of writing.
- [Is Hyperliquid quantum-safe?](https://hardyindex.com/chains/hyperliquid.md): Hardy 7.0, Tier 5: Exposed. Authenticates with ECDSA on secp256k1 through EIP-712 typed-data signing, with no published post-quantum roadmap found despite very large open interest.

## Optional

- [Contact](https://hardyindex.com/contact.md): How to send a correction, a primary source or a rating challenge, and what gets answered first.
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