Developer Jason Dreyzehner announced Quantumroot, the first fully implemented integration-enabled post-quantum vault system built directly with Bitcoin scripts. This breakthrough strengthens Bitcoin Cash’s long-term role by positioning it as one of the leading cryptocurrencies with a practical migration path for millions of users ahead of potential quantum threats.
Bitcoin Cash Becomes First Major Blockchain with Integrated Post-Quantum Vault
Bitcoin Cash is taking a decisive step towards long-term survival in the post-quantum era. Developer Jason Dreyzehner has unveiled Quantumroot, an integration-enabled contract system designed to make Bitcoin Cash the first major blockchain with a practical, scalable and fully implemented post-quantum security solution.
The release comes amid growing concern that quantum computing breakthroughs are accelerating and that cryptocurrencies are likely to be one of the early targets for cryptographically related quantum computing (CRQC).
For Dreyzehner, “quantum-ready” means more than just swapping cryptographic primitives. This means a smooth transition for millions of users without mass theft, network collapse, or emergency forks. “Cryptocurrencies that are not quantum-enabled will be vulnerable to mass theft,” he explained, noting that consensus could even be hijacked in proof-of-stake networks. Because decentralized systems cannot simply patch centralized servers, migrating users and funds to post-quantum addresses could take years, making advance preparation a necessity rather than an option.
Quantumroot stands out from existing proposals both in design and execution. Using the UTXO model and CashVM’s introspection capabilities, Quantumroot delivers 100-1000x lower fees than comparable vaults on Ethereum, avoids privacy leaks, and also delivers fee savings compared to today’s popular BCH/BTC wallets.
Dreyzehner describes Quantumroot’s encryption as “maximally conservative.” Bitcoin Cash’s 2025 and 2026 upgrades made this possible without further changes to the consensus. The Quantumroot vault is already live, with contracts, test suites, and transaction generation tools available to wallet developers.
The efficiency of CashVM allows for large aggregations of up to 800 inputs or 400 unique addresses in a single 100KB post-quantum transaction, making full validation of BCH nodes much more scalable. “This means higher capacity, lower fees, and greater censorship resistance,” Dreisener said. “Exactly what we need to move millions of users post-quantum vault.”
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While the timeline for quantum threats remains uncertain, Dreisener argues that the risks are asymmetric. CRQC could become a reality decades from now or even before 2030, and much of the world’s critical infrastructure already has quantum-safe systems in place. In contrast, Bitcoin Cash can start integrating post-quantum vaults today, and Quantumroot offers instant UX and fee benefits.
If Quantumroot is successful in rolling out across wallets, it has the potential to reshape Bitcoin Cash’s place in the digital economy. “This strengthens BCH’s position as a reserve asset for decades,” Dreisener said. “Quantumroot strengthens the credibility of Bitcoin Cash both as a sound currency and as a peer-to-peer cash system.”
Frequently asked questions🔐
- What is Quantumroot? Why is it important?
Quantumroot is the first post-quantum vault system that can be integrated on top of Bitcoin scripts and is designed to protect users from future quantum attacks. - How does this make Bitcoin Cash different from other blockchains?
Bitcoin Cash will be the first major chain with a practical and fully implemented migration path for millions of users facing quantum risks. - Why do we need early quantum support?
Cryptography-related quantum computers could enable the theft of large amounts of cryptocurrencies, making proactive migration essential before threats materialize. How does Quantumroot improve real-world usability?
We offer 100-1000x lower fees, strong privacy, and a scalable on-chain vault that wallet providers can easily integrate with.
