StarkWare enables first quantum-safe Bitcoin transaction on mainnet

StarkWare has successfully mined the first quantum-safe Bitcoin transaction directly on mainnet using its Quantum Safe Bitcoin (QSB) construction developed by Avihu Levy. The transaction bypasses the vulnerability of Bitcoin's secp256k1 elliptic-curve cryptography to potential quantum computing threats running Shor's algorithm by implementing Lamport-style hash-based signatures relying on RIPEMD-160 for pre-image resistance. Crucially, the solution operates entirely within Bitcoin's legacy Script limits of 201 non-push opcodes and 10,000 bytes, avoiding the need for consensus rule changes, soft forks, or miner negotiations. However, the current implementation presents practical hurdles, including significant off-chain computational requirements costing between $75 and $150 per transaction. Because these transactions are nonstandard, they bypass regular mempool relays and rely on specialized services like MARA Slipstream to reach miners. While commercially impractical for everyday payments, QSB provides immediate post-quantum security for large institutional holders and high-value wallets while establishing a framework for future protocol efficiency and standard relay compatibility.