A team of researchers has proposed a temporary solution to address the issue of quantum-safe transactions in Bitcoin. The proposal, called Quantum Safe Bitcoin (QSB), uses a hash-to-sig puzzle that is resistant to quantum computers.
The QSB scheme operates within the existing legacy script constraints and does not require any changes to the Bitcoin protocol. However, it has some limitations, including high costs and complexity. According to the researchers, using QSB would cost between $75 and $150 per transaction in GPU compute, making it less practical for everyday use.
The proposal comes as a response to concerns that quantum computers could potentially break Bitcoin's cryptography using far fewer resources than previously thought. The QSB scheme is seen as a last-resort measure until a more permanent solution can be implemented.