Until now, quantum skeptics have based their arguments on simple calculations: breaking Bitcoin's elliptic curve encryption would require approximately 2,100 logical qubits. Each logical qubit would need 10,000 physical qubits for error correction. The total hardware requirement would be about 21 million physical qubits. Currently, the best machines have around 6,000 noisy qubits. Therefore, critics like Bitcoin entrepreneur Ben Sigman argued that the real quantum threat is at least 30–50 years away.