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.

🎉 Implementation Complete! As of July 2025, QSBitcoin's quantum-safe features are 100% implemented with all 93 test cases passing. Ready for testnet deployment!

Get a quick overview for

Individuals

Learn more

Businesses

Learn more

Developers

Learn more

Get started with QSBitcoin

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 93 test cases 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.

🚀 Ready for Testnet

QSBitcoin has been thoroughly tested on regtest and is ready for testnet deployment. Both ML-DSA and SLH-DSA signatures work perfectly in all transaction scenarios.

View on GitHub Implementation Status

Why Choose QSBitcoin?

100% Feature Complete

QSBitcoin is a fully operational quantum-safe Bitcoin implementation with 93 comprehensive test cases all passing. 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.