StarkWare researcher Avihu Levy’s Quantum-Safe Bitcoin construction successfully spent a specially protected Bitcoin output on mainnet on August 26, 2026, without changing Bitcoin consensus or adding a new opcode. The 10,000-satoshi QSB output was mined through MARA after direct submission via Slipstream—but the result is better understood as an experimental quantum “lifeboat” than proof that Bitcoin itself is now quantum-safe.On August 26, 2026, Bitcoin block 964,199 included transaction 305a24ffea912b9cf428f29ebf952321c96dab5bab284fc0d0801562f5abab07, the mainnet spend using Avihu Levy’s Quantum-Safe Bitcoin, or QSB, construction....
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