My mission is to highlight the distinctive features of Bitcoin, setting it apart from the broader realm of cryptocurrency. While 'crypto' encompasses cryptography, crucial for securing the Bitcoin network, Bitcoin itself represents a sophisticated blend of technologies meticulously integrated to enhance integrity within financial systems. Central to this mission is clarifying the singular existence of the blockchain, housed exclusively within the Bitcoin protocol, and secured by proof-of-work. It's essential to acknowledge that Bitcoin software stands out as the only truly immutable blockchain system.