What Blockchain is ice on?

Could you please elaborate on the metaphor 'What Blockchain is ice on'? It seems to be a rather intriguing comparison. Are you suggesting that Blockchain technology is akin to the icy surface of something, perhaps a foundation or a platform? If so, could you further explain what that underlying entity might be, and how Blockchain functions as the protective or enabling layer? Or perhaps I'm misinterpreting the analogy entirely – would you kindly clarify your intended meaning and provide some context for why you chose this specific phrasing?