On August 26, 2026, blockchain history was quietly made. Developers successfully mined the first quantum-safe Bitcoin transaction on the mainnet, buried inside block 964,199.
Using an experimental framework called Quantum-Safe Bitcoin (QSB), a research team at StarkWare managed to complete this transaction without needing a single network upgrade—no soft forks, no hard forks, and no changes to Bitcoin's core rules.
Instead of relying on standard elliptic-curve cryptography, which quantum computers could theoretically crack one day using Shor’s Algorithm, this method uses a complex mix of hash-function locks and a computing technique called "signature grinding." Because the transaction format is considered "non-standard" by regular network nodes, it couldn't sit in the public mempool. Instead, it was routed directly to the mining company MARA through their private Slipstream service to be processed.
While it is a massive proof of concept, it isn't a silver bullet just yet. Each transaction requires intensive GPU computation and costs around $150 to $200 in resources. It also can't protect the roughly 7 million Bitcoins sitting in older addresses where public keys are already exposed on the blockchain. Still, it proves that if a quantum emergency happens tomorrow, Bitcoin already has a built-in escape hatch.