Hardy Index Quantum readiness benchmark

Chain profile

Litecoin

LTC 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 Litecoin quantum-safe?

No. Litecoin is derived from Bitcoin's codebase and signs with ECDSA on the secp256k1 curve, which a sufficiently large quantum computer would break. We found no published post-quantum roadmap or named replacement scheme for Litecoin at the time of writing. Litecoin does have one advantage that is easy to overlook and that this index credits: it has demonstrated that it can actually ship a significant consensus change. The MWEB soft fork, activating the Mimblewimble Extension Blocks upgrade, was proposed, implemented and activated on Litecoin while comparable proposals on Bitcoin remained unactivated. Governance capability is a real component of migration feasibility, and Litecoin has evidence for it where most chains have only assertions.

Where we are making a judgement call Litecoin sits in Tier 5 because its mainnet signatures are quantum-vulnerable and no post-quantum proposal or roadmap specific to Litecoin was found. Its migration score of 2 is higher than several peers with identical cryptography, and that is deliberate: activating MWEB is evidence that Litecoin can enact a consensus change, which is the capability a quantum migration would ultimately require.

At a glance

On mainnet today

ECDSA on secp256k1, inherited from Bitcoin

Post-quantum scheme

None proposed. No Litecoin-specific post-quantum work was found.

NIST standard

None adopted

Readiness tier

Tier 5: Exposed. The signatures securing funds on mainnet today are quantum-vulnerable, and no public post-quantum plan, proposal or research programme addressing them could be found.

Score breakdown

Each dimension scored 0 to 10. The weight beside it is its share of the total score.
Signature scheme 0 30% Deployment stage 1 25% NIST alignment 0 15% Migration path 2 15% Exposure 4 10% Verification 6 5%
Show the weighted arithmetic and the sourced note for each dimension
No. Dimension Score Weight Contribution
1 Signature scheme 0 30% 0.0
2 Deployment stage 1 25% 2.5
3 NIST alignment 0 15% 0.0
4 Migration path 2 15% 3.0
5 Exposure 4 10% 4.0
6 Verification 6 5% 3.0
Hardy Score 12.5

1 Signature scheme 0/10, weighted 30%

Band 0: Classical signatures only on mainnet, with nothing post-quantum protecting live funds. Short-lived devnets and one-off benchmarks sit here: they demonstrate research rather than something a user can hold keys on.

Litecoin uses ECDSA on secp256k1, inherited from the Bitcoin codebase. Nothing post-quantum protects LTC on mainnet. source

2 Deployment stage 1/10, weighted 25%

Band 1: Tier 5: Exposed.

Tier 5: Exposed. Litecoin signs with ECDSA on secp256k1 and no post-quantum proposal or roadmap specific to Litecoin was found at the time of writing. source

3 NIST alignment 0/10, weighted 15%

Band 0 to 2: No named post-quantum scheme, or a proprietary scheme with no public cryptanalysis.

No post-quantum scheme has been named or proposed for Litecoin, so there is nothing to assess against a NIST standard. source

Placement in the band The floor of the band rather than a 1 or a 2: no scheme has been named or proposed for Litecoin, so there is nothing to assess against a standard.

4 Migration path 2/10, weighted 15%

Band 0 to 2: No agreed migration path, or the proposals on the table would strand or freeze holder funds.

Litecoin has demonstrated it can activate a substantial consensus change, having shipped the MWEB soft fork, which is direct evidence of governance capability rather than a claim about it. It has not applied that capability to the quantum problem, and no migration plan exists. source

Placement in the band At the top of the band rather than a 0 or a 1: shipping MWEB is direct evidence that Litecoin can activate a substantial consensus change. It cannot reach 3 because that capability has never been pointed at the quantum problem and no plan exists.

5 Exposure 4/10, weighted 10%

Band 3 to 5: Most active accounts have revealed a public key, or the chain has no live supply to assess.

Litecoin uses the UTXO model with addresses derived from public key hashes, so unspent coins have not published a key. Spending reveals it, and address reuse is common, so a meaningful share of supply sits behind revealed keys. source

Placement in the band A 4 rather than a 5: unspent coins have published no key under the UTXO model. It is held down because address reuse is common and every spend reveals the key, so a meaningful share of supply sits behind revealed keys.

6 Verification 6/10, weighted 5%

Band 6 to 8: Open source with public review or a named third-party audit of the relevant component.

The Litecoin client is open source and derived from a heavily reviewed codebase, so the signature scheme can be verified directly. There is no post-quantum claim to assess. source

Placement in the band The floor of the band: the client is open source and derived from a heavily reviewed codebase, but there is no post-quantum claim to assess, which is what the upper half of this band credits.

The deployment dimension is not a separate judgement. It is Tier 5 expressed as a number. See the tier mapping.

How it compares

All 31 rated chains on the 0 to 100 scale. Litecoin is marked. Select any point to open that profile.
Litecoin 12.5

Nearest chains in the ranking

The 9 chains Litecoin sits among, out of 31 rated. The last column is the gap in Hardy points from Litecoin.

Rank Chain Tier Hardy vs LTC
21 IOTA 5: Exposed 18.5 +6.0
22 Bitcoin 4: Debating 17.0 +4.5
23 Internet Computer 5: Exposed 14.5 +2.0
24 TON 5: Exposed 13.0 +0.5
25 Litecoin this chain 5: Exposed 12.5
26 Bittensor 5: Exposed 11.0 -1.5
27 Dogecoin 5: Exposed 11.0 -1.5
28 Avalanche 5: Exposed 10.5 -2.0
29 Cronos 5: Exposed 8.5 -4.0

Roadmap

  1. 2022 shipped

    Litecoin activates the MWEB soft fork, demonstrating that it can propose, implement and activate a substantial consensus change. Not post-quantum work, but directly relevant evidence of migration capability. source

  2. No published position proposed

    No post-quantum roadmap or improvement proposal specific to Litecoin was found at the time of writing. source

Exposure

Exposure measures how much of the chain's value already sits behind a public key that an attacker can record today and break later. This is the part of the threat that a future upgrade cannot undo.

Litecoin follows Bitcoin's UTXO model, so an address is a hash of a public key and the key is published only when an output is spent. Coins received and never moved are not harvestable. As on Bitcoin, that protection erodes through address reuse and ordinary spending, and Litecoin has a long transaction history in which many addresses have been reused. Unlike Bitcoin, no independent analysis quantifying the share of Litecoin supply behind revealed keys was found, so the exposure score here reflects the address model rather than a measurement.

What this rating means for you

If you hold Litecoin

Litecoin runs quantum-vulnerable signatures with no published post-quantum plan that we could find. Nothing here is urgent today, and there is also nothing scheduled to change it.

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From the newsroom

What we have published about this chain

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Questions

Is Litecoin quantum-safe?

No. Litecoin uses ECDSA on the secp256k1 curve, inherited from Bitcoin, which a sufficiently large quantum computer would break. We found no published post-quantum roadmap or proposal specific to Litecoin.

Why does Litecoin score higher than Dogecoin on migration?

Because it has proved it can ship a consensus change. Litecoin proposed, implemented and activated the MWEB soft fork, while comparable proposals on Bitcoin remain unactivated. That is evidence of governance capability rather than an assertion, and migration feasibility is partly a governance question.

Does Litecoin's MWEB privacy feature help against quantum attack?

No. MWEB is a privacy and scaling upgrade based on Mimblewimble. It does not change the signature scheme protecting funds, which remains ECDSA on secp256k1. Privacy and quantum safety are separate properties, and MWEB delivers the first without affecting the second.

Could Litecoin adopt Bitcoin's post-quantum work?

Plausibly. Litecoin's codebase is closely derived from Bitcoin's, so an output type such as the one proposed in BIP-360 could be adapted rather than designed from scratch. Combined with Litecoin's demonstrated ability to activate soft forks, that is a credible route, though no one has published a plan to take it.

Sources

  1. Litecoin Core reference client Litecoin Project (GitHub) · primary · checked 12 August 2026
  2. BIP-360: Pay-to-Merkle-Root (P2MR) Bitcoin Improvement Proposals · primary · checked 12 August 2026
  3. Safeguarding cryptocurrency by disclosing quantum vulnerabilities responsibly Google Research · primary · checked 12 August 2026
Cite this rating

A rating is only true as of the day it was reviewed, so both forms below carry the review date and the methodology version. If you are quoting the score, quote those too.

Plain text

The Hardy Index (2026). Litecoin: quantum readiness assessment. Hardy Score 12.5 of 100, Tier 5: Exposed. Methodology v1.4. Reviewed 2 October 2026. https://hardyindex.com/chains/litecoin

BibTeX 
@misc{hardyindex_litecoin_2026,
  author       = {{The Hardy Index}},
  title        = {Litecoin: quantum readiness assessment},
  year         = {2026},
  howpublished = {\url{https://hardyindex.com/chains/litecoin}},
  note         = {Hardy Score 12.5 of 100, Tier 5: Exposed. Methodology v1.4},
  urldate      = {2026-10-02}
}

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This is a security-readiness assessment, not investment advice.