Suddenly, I wonder what time really is. I always feel that time passes faster now than before. When I was a child, a day felt like a year; now I feel a year passes like a day. In the blink of an eye, 2025 is almost over. In the past, calendars and blockchains were quite similar—they are both decentralized, with everyone in the world keeping records. The vast majority of people worldwide say today is a certain year, month, and day, and it is indeed that year, month, and day. Even if someone says today's date is next year's date, it doesn't change anything.