# pq blockchains
**URL:** https://superpositions.com/c/pq-blockchains/10.md
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## [About the pq blockchains category](https://superpositions.com/t/about-the-pq-blockchains-category/20)
**Author:** [@kearneyjj](https://superpositions.com/u/kearneyjj)\
**Replies:** 0\
**Last updated:** [May 23, 2025, 12:55pm UTC](https://superpositions.com/t/about-the-pq-blockchains-category/20 "2025-05-23T12:55:17Z")
Purpose Large‑scale quantum computers will eventually break the ECDSA, Ed25519, and Schnorr signatures that underpin most public blockchains today. This category exists to discuss how ledgers, wallets, and smart‑contrac…
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## [Quantum vs. USDC: A Threat Analysis of Circle’s Smart-Contract](https://superpositions.com/t/quantum-vs-usdc-a-threat-analysis-of-circle-s-smart-contract/39)
**Author:** [@cjd](https://superpositions.com/u/cjd)\
**Replies:** 5\
**Last updated:** [October 23, 2025, 6:26pm UTC](https://superpositions.com/t/quantum-vs-usdc-a-threat-analysis-of-circle-s-smart-contract/39 "2025-10-23T18:26:02Z")
I’ve been looking into Circle’s USDC smart contract and the impact that a quantum computer might have on its cryptography. This seems pretty timely given Circle went public on June 5, 2025 and its share price went from t…
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## [The Cost of an Upgrade - Post-Quantum Impact on Bitcoin](https://superpositions.com/t/the-cost-of-an-upgrade-post-quantum-impact-on-bitcoin/43)
**Author:** [@kearneyjj](https://superpositions.com/u/kearneyjj)\
**Replies:** 0\
**Last updated:** [July 25, 2025, 4:09pm UTC](https://superpositions.com/t/the-cost-of-an-upgrade-post-quantum-impact-on-bitcoin/43 "2025-07-25T16:09:15Z")
Time is running out for RSA and the Elliptic Curve Digital Signature Algorithm (ECDSA). They won’t survive a cryptographically relevant quantum computer (CRQC), and upgrades to our underlying cryptography, globally, have…