Starknet has introduced a quantum-safe Bitcoin approach called QSB, saying StarkWare researchers validated the mechanism on Bitcoin mainnet without requiring a soft fork, new opcodes, or changes to consensus rules. According to the post, the first QSB output was spent on Aug. 26, 2026, in Bitcoin block 964,199. The associated GPU computing cost has fallen from about $320 to about $50.
The design uses hash-based computation to build the locking mechanism, but it still requires heavy computation for each transaction. Starknet also said moving assets into the scheme still relies on a traditional transaction that carries quantum risk. In addition, the transaction does not comply with Bitcoin Core’s default relay policy, and there is currently no supporting wallet, address format, or recovery process.
StarkWare described QSB as an emergency research approach rather than a final answer. The company said a long-term fix would still require a soft fork to introduce post-quantum signature mechanisms. It also noted that full quantum resistance for Starknet depends on the progress of upgrades at Ethereum’s base layer.
ChainCatcher reported that Starknet has introduced a quantum-safe Bitcoin scheme called QSB. In the post, StarkWare researchers said they had validated a quantum-safe locking mechanism on Bitcoin mainnet without a soft fork, new opcodes, or changes to consensus rules.
According to the disclosure, the first QSB output was spent on Aug. 26, 2026, in Bitcoin mainnet block 964,199. The related GPU computing cost has dropped from about $320 to about $50.
QSB builds its locking mechanism through hash-based computation, but each transaction still requires substantial computation. Moving assets into the scheme still depends on a traditional transaction that carries quantum risk.
StarkWare also said the transaction does not meet Bitcoin Core’s default relay rules. There is also no supporting wallet, address format, or recovery process at this stage.
The company described QSB as an emergency research scheme. In its view, a long-term solution would still require a soft fork to introduce post-quantum signature mechanisms. Whether Starknet can achieve full quantum resistance also depends on the pace of upgrades to Ethereum’s underlying layer.
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