What year did curves come out?

Excuse me, could you please clarify your question regarding "curves"? Are you referring to a specific cryptocurrency, financial instrument, or perhaps a technological advancement related to finance or cryptocurrency? If you're asking about a particular cryptocurrency or financial product, it would be helpful to have more context as there are many different "curves" in the financial world, such as yield curves, volatility curves, or even pricing curves for various assets. Assuming you're asking about a cryptocurrency or a financial product that utilizes the term "curves" in its name or concept, it's difficult to provide an exact year without knowing the specific product. However, if we're talking about a general trend or concept related to curves in finance or cryptocurrency, it's worth noting that the concept of curves, particularly in relation to financial instruments and markets, has been around for decades. If you're looking for a specific year when a particular product or technology related to "curves" was introduced in the cryptocurrency or finance space, I would recommend providing more details about the product or technology you're inquiring about. Alternatively, you could conduct a search online or consult with experts in the field to find out more about the history and development of that specific product or technology.