Bitcoin May Be Quantum-Safe If Musk-Backed 400-Qubit Theory Holds

Elon Musk endorsed a physics theory capping quantum computers near 400 qubits, and Bitcoin (BTC) traders read it as proof the 835 qubits needed to break the network are unreachable.

Key Points:

• Musk endorsed a discrete-universe theory that caps usable qubits near 400, without mentioning Bitcoin.
• Breaking Bitcoin's signatures takes an estimated 835 logical qubits, down from earlier published figures.
• IBM targets 200 logical qubits by 2029, leaving both the physics claim and the attack estimate untested.

Elon Musk Backs Palmer Quantum Qubit Ceiling

Musk replied on Aug. 29 to an Institute of Art and Ideas post about the work of Oxford physicist Tim Palmer, writing that the universe is integer in units of Planck cubes. The post had gone up a day earlier. He said nothing about private keys, digital signatures or the Bitcoin network, and his comment addressed physics rather than cryptography.

Investor Fred Krueger picked up the exchange the next day and argued that Bitcoin may already be quantum-safe, because current estimates put the attack requirement at 835 logical qubits. Krueger added that Musk and venture investor Steve Jurvetson had both commented favorably on the research.

Palmer is a Royal Society fellow elected in 2003 who spent his career building weather forecasting models at Oxford.