Post-Quantum Blockchain · Apache 2.0 · Rust
BitQuan is a minimal Proof-of-Work blockchain secured by CRYSTALS-Dilithium5 — a NIST-approved post-quantum signature scheme. Built with deliberate simplicity: no smart contracts, no governance tokens, no DeFi. Just value transfer, for the next 50 years.
CRYSTALS-Dilithium5 signatures. NIST standard. Provably secure against Shor’s algorithm and known quantum attacks.
Longest valid chain rule. ASERT difficulty adjustment. No checkpoints, no governance, no trusted third parties.
No smart contracts. No DeFi. Pure value transfer. Complexity is the enemy of security — we chose simplicity.
Exactly 21,000,000 BQ. SHA-256d mining with RandomX support. Predictable issuance, no surprises.
Written in Rust. Only 14 unsafe blocks, all justified. Minimal unwrap() in production paths.
Apache 2.0 license. Fully auditable. No backdoors. External security audit targeted Q3 2026.
Post-quantum security has a cost. We don’t hide it. Dilithium5 signatures are 63× larger than Bitcoin’s ECDSA. Layer 1 throughput is intentionally low — scalability lives at Layer 2.
“Emergency hard forks for post-quantum migration are risky and disruptive. We made the deliberate choice to pay the cost today, so users don’t pay a far greater cost later.”
— BitQuan · POST_QUANTUM_TRADEOFFS.md| Metric | Bitcoin | BitQuan | Rationale |
|---|---|---|---|
| Signature Size | ~73 bytes | 4,595 bytes | PQ Security |
| Layer 1 TPS | ~7 | < 1 | By Design |
| Quantum Resistance | Vulnerable | Dilithium5 | NIST Std |
| Scaling Strategy | SegWit / L2 | ZK-Rollup / L2 | BQIP-0004 |
Run a testnet node in minutes. Requires Rust 1.82+ or Docker.
Wallet addresses use the prefix bq1q… — human-readable, unambiguous, quantum-safe.
| Component | Status | Notes |
|---|---|---|
| Core Protocol | Complete | ASERT difficulty, P2P sync |
| Cryptography | Complete | Dilithium5 signatures (NIST) |
| Data Integrity | Fixed | C1–C7 vulnerabilities resolved |
| Unit Tests | 795+ | Consensus + integration + E2E |
| Internal Audit | Complete | Security hardening done |
| External Audit | Pending | Q3 2026 target |
| Testnet | Q2 2026 | Public launch |
| Mainnet | Q4 2026 | Post-audit |