Are there coins in Sonic?

Are there indeed coins or a virtual currency system integrated within the Sonic the Hedgehog franchise? If so, have they been incorporated in a way that enhances gameplay or provides players with unique opportunities for rewards and engagement? Are these coins part of a broader economic system within the Sonic universe, or are they simply a means of scoring points or unlocking new content? Furthermore, have there been any notable changes or updates to the coin system over the years, perhaps reflecting advancements in the cryptocurrency and digital finance space? It would be intriguing to explore how Sonic's coin system, if it exists, aligns with modern trends in virtual economies and digital asset management.