IBM has achieved a significant quantum computing milestone by entangling 120 qubits into a stable state, verified with a fidelity of 0.56. This advancement, utilizing Greenberg-Horne-Zeilinger (GHZ) states, reduces noise in superconducting circuits and brings quantum computing closer to potentially breaking elliptic-curve cryptography (ECC) used in Bitcoin. Current research indicates that breaking RSA encryption could now require fewer than one million qubits, accelerating the timeline for potential threats to cryptocurrency security. In response, blockchains like Ethereum and Algorand are exploring post-quantum encryption solutions to mitigate these risks.