StarkWare Executes First Quantum-Safe Bitcoin Transaction on Mainnet

A StarkWare researcher has mined what the company describes as the first quantum-safe transaction on the Bitcoin mainnet, showing that holders could move coins into storage a working quantum computer cannot open without waiting for a soft fork.

The milestone, detailed in StarkWare’s announcement, required no change to Bitcoin’s consensus rules.

A second lock built on hash functions The construction, called Quantum-Safe Bitcoin (QSB), was designed by Avihu Levy, a researcher and General Manager of Applications at StarkWare who published the underlying research in April 2026 and built it on his own time.

Bitcoin’s ordinary signatures rest on elliptic-curve cryptography, the class of math that Shor’s algorithm could solve on a large enough quantum computer.