---
title: "FN-DSA: which blockchains use it"
url: "https://hardyindex.com/algorithms/fn-dsa"
---

# FN-DSA

Falcon, a lattice-based signature scheme selected by NIST for standardisation as FN-DSA in FIPS 206, which had not been published in final form at the time of writing. Its signatures are much smaller than ML-DSA's, in parameter sets Falcon-512 and Falcon-1024.

- **Quantum status:** Believed quantum-resistant. No post-quantum scheme carries a proof of resistance.
- **Standard:** FIPS 206 (NIST, draft).
- **Family:** lattice.
- **Also known as:** Falcon, FIPS 206.

## Rated chains using it

- [Algorand](https://hardyindex.com/chains/algorand.md): account signatures, mainnet, opt-in, Falcon-1024. Native account type since 22 August 2026. Existing accounts can rekey to it. Source (source code or release): https://github.com/algorand/go-algorand/releases/tag/v5.0.0-stable
- [Algorand](https://hardyindex.com/chains/algorand.md): ledger attestation, mainnet, mandatory. State Proofs, signed with Falcon since 2022. Source (statement or write-up): https://algorand.co/blog/technical-brief-quantum-resistant-transactions-on-algorand-with-falcon-signatures
- [Hedera](https://hardyindex.com/chains/hedera.md): account signatures, proposed. New key type targeted for 2027, with ML-DSA as the fallback if FIPS 206 is delayed. Source (statement or write-up): https://hedera.com/blog/post-quantum-cryptography-and-blockchain/
- [IOTA](https://hardyindex.com/chains/iota.md): identity layer, mainnet, opt-in. IOTA Identity v1.7 credentials, not layer-1 transactions. Source (specification or proposal): https://docs.iota.org/developer/iota-identity/how-tos/post-quantum
- [Neo](https://hardyindex.com/chains/neo.md): account signatures, proposed. Falcon is named as a research candidate in the issue's task list. One contributor recommended Falcon-512, and a member raised Falcon's floating-point arithmetic as a problem for a decentralised network. Source (statement or write-up): https://github.com/neo-project/neo/issues/4239
- [Nexus](https://hardyindex.com/chains/nexus.md): account signatures, mainnet, opt-in, Falcon-512. Accepted by consensus for signature-chain transactions and selectable with scheme=falcon. No holder transaction in our mainnet sample used it. Source (source code or release): https://github.com/Nexusoft/LLL-TAO/blob/5.1.6/src/TAO/Ledger/transaction.cpp#L515-L547
- [Polkadot](https://hardyindex.com/chains/polkadot.md): account signatures, proposed. Source (statement or write-up): https://forum.polkadot.network/t/post-quantum-cryptography-roadmap-for-polkadot-and-jam/13232
- [Solana](https://hardyindex.com/chains/solana.md): account signatures, specified, not deployed. Implementations exist in Anza and Firedancer; not deployed. Source (statement or write-up): https://solana.com/news/quantum-readiness
- [Tidecoin](https://hardyindex.com/chains/tidecoin.md): account signatures, mainnet, mandatory, Falcon-512 (round 3, PQClean). Every input in the sampled transaction carries an 898-byte key (897-byte Falcon-512 key plus prefix) and a 655 to 663-byte signature. The v0.18.3 verifier calls Falcon-512 alone. Source (read on-chain): https://explorer.tidecoin.org/tx/84952925da010dae1e4280708acb2d277185dc86765a75e01077d8df30d04919
- [Tidecoin](https://hardyindex.com/chains/tidecoin.md): account signatures, specified, not deployed, Falcon-1024. In the 1.0 release candidates, gated on the AuxPoW activation, which is disabled in the mainnet parameters. Source (source code or release): https://github.com/tidecoin/tidecoin/releases/tag/v1.0.0rc2
- [Tron](https://hardyindex.com/chains/tron.md): account signatures, testnet, Falcon-512. Activated on the Nile testnet; absent from mainnet. Source (read on-chain): https://api.nileex.io/wallet/getchainparameters
- [XDC Network](https://hardyindex.com/chains/xdc-network.md): validator consensus, specified, not deployed. Proof of concept on an unmerged branch, last committed 9 August 2025. Source (source code or release): https://github.com/XinFinOrg/XDPoSChain/tree/poc_falcon

## Sources

- [Falcon: Fast-Fourier Lattice-based Compact Signatures over NTRU](https://falcon-sign.info/), Falcon team. Accessed 19 October 2026.
- [Post-Quantum Cryptography project](https://csrc.nist.gov/projects/post-quantum-cryptography), NIST. Accessed 19 October 2026.