Bitcoin’s developer community marked a notable technical milestone on September 10, 2026, with the mining of the first quantum-safe transaction on the mainnet. The transaction was included in block 964,199 and was accomplished without requiring any protocol changes, underscoring the network’s ability to adopt advanced cryptographic techniques while preserving its existing consensus rules.
The development is being interpreted as a step toward strengthening Bitcoin’s long-term security against quantum computing threats. Because quantum computers could eventually challenge traditional public-key cryptography, the successful mainnet demonstration may bolster confidence among investors and developers focused on the network’s durability.
Separately, researchers reportedly halved a quantum resource benchmark for one key operation relevant to potential attacks on Bitcoin and Ethereum. The report, however, describes a narrow component-level efficiency gain rather than a practical break of either network’s cryptography. The available information does not establish halved full attack costs, present attack feasibility, or compromised wallets, and key details such as the specific operation, resource unit, baseline values, and methodology still require verification against the primary research.
The two networks do not necessarily share identical exposure to quantum attack requirements, and any complete attack would involve many additional steps, hardware assumptions, error-correction requirements, and economic parameters. For now, the quantum-safe milestone is the clearer positive signal, while the benchmark research remains a cautionary but unconfirmed data point rather than an immediate threat.
