Algorand is the only major L1 with a post-quantum transaction on mainnet with 140,000+ quantum-resistant transactions. Algorand shipped their first post-quantum update in 2022 far before anyone was talking about it. They have Chris Peikart, Head of Resear

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"Algorand has been the leader in blockchain quantum resilience since 2022. By implementing Falcon signatures, a globally recognized post-quantum cryptography standard, Algorand already safeguards the entire history of its chain against the future threat of quantum computers.

In 2025, Algorand further extended its post-quantum readiness by executing the first quantum‑resistant transaction on mainnet using NIST‑selected Falcon signatures. This expands Algorand’s post‑quantum protections to real digital assets on a live public blockchain, not just historical transactions. "

Chris Peikart helped develop FALCON signatures, which other major L1s are or are going to adopt in the future.

"The Falcon implementation is based on the pioneering GPV work by Craig Gentry (former Algorand Foundation Research Fellow), Chris Peikert (Head of Cryptography at Algorand Technologies), and Vinod Vaikuntanathan (MIT professor and Scientific Advisor to Algorand). Dr. Zhenfei Zhang from Algorand, working with collaborators, contributed to the Falcon proposal that was ultimately selected as one of the NIST-endorsed digital signature algorithms.

Falcon is a lattice-based digital signature scheme selected by NIST in 2022 for standardization under the names Falcon-512 and Falcon-1024. It relies on the structure of NTRU lattice, which provides strong resistance to quantum attacks while maintaining compact signatures and fast verification. Falcon’s design goal is to achieve security comparable to RSA-3072 or Ed25519, but with quantum-resistant foundations suitable for deployment in bandwidth-and latency-sensitive environments such as blockchain systems."

https://algorand.co/technology/post-quantum

https://web.eecs.umich.edu/~cpeikert/