Universal Quantum Security: One Wallet, Every Asset Class, Post-Quantum by Default
Battua Engineering · June 1, 2026 · 11 min read
Battua is built as a universal wallet: one interface for native crypto, stablecoins, CBDC pilots, and tokenized real-world assets. That universality is a product promise—but it is also a security obligation. If each asset class used a different cryptographic posture, users would inherit the weakest link. Universal quantum security means every signature path Battua controls defaults to ML-DSA-87 (NIST FIPS 204, Level 5) from the first transaction, with no classical-only fallback.
Why “universal” changes the threat model
Retail wallets often treat Bitcoin as the only long-horizon key-exposure problem. Enterprise treasuries do not have that luxury. Stablecoin settlement, CBDC corridor pilots, and on-chain registry writes all produce durable cryptographic evidence. An adversary running harvest-now, decrypt-later against any one of those flows can index public material today and break it when a cryptographically relevant quantum computer exists—without waiting for Bitcoin’s BIP-360 migration to finish.
A universal wallet cannot ship post-quantum for Layer-1 Bitcoin and classical-only for everything else. Users will not maintain two mental models; attackers will not respect asset-class boundaries.
ML-DSA-87 as the single default
Battua signs with ML-DSA-87 across MPC combine, evidence ledger attestations, and wallet operations that require non-repudiation. The engineering cost—larger keys and signatures, ~1.5 ms signing on modern hardware—is bounded and already paid in production via BouncyCastle’s NIST-track implementation. Federal CNSA 2.0 timelines (quantum-resistant algorithms on new systems from 2027, full migration by 2033) are pushing the entire toolchain toward ML-DSA whether crypto-native vendors move or not.
What universal does not mean
Universal quantum security is not “we solved quantum for every chain overnight.” External networks still expose ECDSA public keys when users spend from legacy addresses. Battua’s obligation is to make the default path quantum-native, surface migration tooling (BIP-360 / BIP-361 readiness), and never silently downgrade a user to classical-only signing because it is easier to demo.
Checklist for evaluators
- Default signature algorithm: ML-DSA-87, not optional hybrid or upgrade-later.
- MPC shard handling: post-quantum combine, keys in OpenBao KV—not hot single-party storage.
- Evidence ledger: ML-DSA-signed audit trail for high-risk operations.
- Migration: P2MR / quantum-resistant receiving addresses ready before mainnet soft-forks activate.
Conclusion
Universal wallets win on UX; they only earn trust if security is universal too. Post-quantum cryptography is no longer a research slide—it is a shipping requirement for any wallet that expects to hold institutional balances across asset classes in the 2030s. Battua chose to ship it in 2026, by default, for everyone.