Quantum Safe Bitcoin Proposal Introduced to Mitigate Quantum Threats

• •Quantum Safe Bitcoin (QSB) offers a temporary solution against quantum attacks without protocol changes.
• •Each QSB transaction incurs high costs of $75 to $200 due to off-chain GPU computations.
• •The proposal is not intended for regular use and may face compatibility issues with existing Bitcoin infrastructure.

StarkWare researcher Avihu Levy has proposed a Quantum Safe Bitcoin (QSB) transaction scheme that aims to protect Bitcoin transactions from potential quantum attacks without altering the existing Bitcoin protocol. This method replaces the current elliptic-curve signatures with hash-based cryptography and Lamport signatures, which are resistant to quantum threats. The QSB requires users to solve a cryptographic puzzle off-chain before broadcasting transactions, with an estimated cost of $75 to $200 per transaction due to intensive GPU computation. While QSB operates within Bitcoin's existing scripting rules, it is not designed for everyday use and presents compatibility challenges, particularly with the Lightning Network. The proposal is viewed as a stopgap measure until a more scalable solution, such as BIP-360, is implemented. However, BIP-360 faces governance uncertainties and is unlikely to be activated soon, leading to skepticism among market participants regarding its deployment timeline.