The assessment is primarily based on a single, highly authoritative and relevant source. This source is a post on X that directly relays information from Nikita Bier, an X Product Lead. It explicitly states a list of the most searched cashtags on the platform, and this list includes the Bitcoin cashtag ($BTC). Information coming from a product lead at the company is considered a very strong piece of evidence, as they would have direct access to this type of user data.The other two provided sources discuss the implementation of a 'Smart Cashtags' feature on X, which affects cashtags like $BTC. While they confirm that X is actively developing features around financial tickers, they have low relevance to the specific claim about search frequency. They do not provide any data on search volume or popularity and neither support nor contradict the primary evidence.Since there is direct, uncontradicted evidence from a high-authority internal source confirming that $BTC is among the most searched cashtags, the statement is assessed as likely true with a high level of confidence.