Post-quantum vaults are now live on Bitcoin Cash's Chipnet, the 6-month-early preview network. 🔥 CashVM makes quantum readiness ultra-efficient: sweeps from quantum-ready addresses cut transaction sizes vs. P2PKH/P2WPKH by up to 10.9%, despite the increase from 20-byte hashes to 32-byte hashes (for highest-level, NIST Category 5 quantum security strength). Users who regularly buy or earn Bitcoin Cash to a Quantumroot vault will save on fees after just 6 payments. 🚀 Maximum Quantum Security With NIST Post-Quantum Cryptography Category 5 security, Quantumroot is expected to remain secure for decades into the post-quantum era. Quantumroot implements the standard LM-OTS signature scheme (RFC 8554), which itself relies only on SHA256 for security – no lattice-based or other relatively-experimental cryptography. From a cryptographic-security perspective, Quantumroot is maximally conservative. Low Transaction Fees Bitcoin Cash's highly parallel architecture – the "UTXO model" – offers better performance and lower-level control than account-based systems, enabling Quantumroot to offer 100-1000× lower fees than equivalent vaults on Ethereum. Privacy Nonces Pre-quantum transactions do not expose associations between vault addresses: a 32-byte privacy nonce included in the hidden token-based spending path prevents even quantum attackers from connecting the address with recovery policies unless revealed by a post-quantum recovery. Sweep-Free Upgrades The hidden recovery path can be upgraded without sweeping the vault: only unassociated token UTXOs are moved on-chain. This simplifies user experiences and makes it easier for vaults to upgrade recovery, inheritance, or business continuity policies. Other details: - Post-quantum contract code adds zero bytes to pre-quantum spends. - On average, post-quantum spends are just ~1.5KB per payment. (With sufficient aggregation, ZK-STARK BCH covenants/apps could improve this further.) - P2PKH addresses can support 708 input sweeps per 100KB transaction; Quantumroot increases that to 891 inputs. - Post-quantum sweeps can fit 868 inputs or 448 unique addresses per 100KB transaction. For more details and links to on-chain transactions, see the blog post: For a deep dive and walkthrough of the CashVM contracts, see the August 20 tech talk: