[Which Bitcoin Addresses Can Be Cracked by Quantum Processing?] 1. Many people believe that bc1p is a more secure new address. On the contrary, the Taproot address's public key is publicly available from the moment it receives the coins. In the face of a quantum computer, it's like Satoshi Nakamoto's early P2PK address—a completely unsecured address. 2. Addresses starting with 1 and bc1q are currently secure as long as they are not transferred out or reused; the public key is hidden behind the hash.