QSBitcoin: A quantum-safe implementation of Bitcoin Core protecting your assets against future quantum threats

Status: QSBitcoin is a fully functional quantum-safe Bitcoin implementation based on Bitcoin Core v28.0. It adds NIST-standardized post-quantum signatures while maintaining full backward compatibility with the Bitcoin network. Currently active on testnet and regtest networks for testing and development.

🎉 Implementation Complete! As of July 2025, QSBitcoin's quantum-safe features are 100% implemented and fully operational on testnet/regtest networks!

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QSBitcoin uses peer-to-peer technology to operate with no central authority or banks; managing transactions and the issuing of qsbitcoins is carried out collectively by the network. QSBitcoin is open-source; its design is public, nobody owns or controls QSBitcoin and everyone can take part.

Quantum-Safe Technology

NIST-Standardized Algorithms

QSBitcoin implements two NIST-standardized post-quantum signature schemes: ML-DSA-65 (Module-Lattice Digital Signature Algorithm) for standard transactions and SLH-DSA-192f (Stateless Hash-Based Digital Signature Algorithm) for high-value cold storage.

Unified Opcodes

Using innovative unified opcodes (OP_CHECKSIG_EX and OP_CHECKSIGVERIFY_EX), QSBitcoin supports multiple quantum algorithms with just two new opcodes, reducing complexity and improving extensibility.

Soft Fork Activation

QSBitcoin is implemented as a soft fork of Bitcoin Core, meaning it's fully backward compatible. Both ECDSA and quantum signatures are accepted, allowing users to migrate at their own pace.

Latest Development Updates

✅ July 2025: Implementation Complete

All quantum-safe features are now fully implemented. The codebase includes complete wallet integration, transaction signing, and comprehensive test coverage with all quantum-specific unit tests passing.

🔧 Critical Bug Fixes Completed

Fixed quantum signature verification, manual UTXO selection, and witness script parsing. All quantum addresses can now generate, receive, and spend funds successfully.

🚀 Active on Testnet/Regtest

QSBitcoin is fully operational on regtest and testnet networks. Both ML-DSA and SLH-DSA signatures work in all transaction scenarios. Mainnet activation awaits community consensus.

View on GitHub Implementation Status

Why Choose QSBitcoin?

100% Feature Complete

QSBitcoin is a fully operational quantum-safe Bitcoin implementation with comprehensive test coverage. Quantum addresses can generate, receive, and spend funds on regtest and testnet networks.

Smart Fee Structure

To incentivize adoption, QSBitcoin offers fee discounts: 10% off for ML-DSA signatures and 5% off for SLH-DSA signatures, with special weight calculations that reflect actual validation costs.

Flexible Migration

No forced migration - users control when to switch from ECDSA to quantum signatures. Mixed transactions supporting both signature types are fully supported.

Open Source & MIT Licensed

The complete implementation is available at github.com/qsbitcoin/qsbitcoin under the MIT license. Based on Bitcoin Core v28.0 with full documentation and test coverage.