Quantum Computing is a growing risk for Bitcoin.

Quantum computing poses a growing risk to Bitcoin because Shor's Algorithm could, in theory, let quantum computers find private keys from public keys. Pay to public key (P2PK) addresses are the most vulnerable, since the public key serves directly as the address, while pay to public key hash (P2PKH) addresses offer extra protection but expose the public key when Bitcoin is transferred, so address reuse significantly increases vulnerability. Since quantum speculation rose, P2PKH address usage has increased by 14%, though it is unknown whether this results from quantum computing rumours.