According to the source, a 'bellwether year' for crypto IPOs is referenced with mentions of Circle and Bullish, but the source provides only a headline and link without confirmed filing numbers, tickers, pricing ranges, underwriters, or listing venues, so no verifiable trading catalysts can be confirmed from this item alone (source: the provided tweet). Without those specifics, potential impacts on BTC, crypto equities, and exchange-linked tokens cannot be quantified or timed based on the source alone (source: the provided tweet).