Multiple independent sources with high relevance and moderate-to-high authority report that BlackRock has initiated a billboard advertising campaign to promote its spot Bitcoin ETF. These include cryptocurrency-focused news outlets and social media posts from Bitcoin Magazine, which provide contemporaneous coverage and even visual evidence of billboard ads featuring slogans like 'Bitcoin exposure made easy.' While social media posts are not as authoritative as official press releases or major financial media, the consistency across several platforms and news articles strengthens the credibility of the claim. There are no sources providing direct contradiction or suggesting that the reports are false, though official confirmation from BlackRock itself was not present in the reviewed sources. The overlap between reports and photographic evidence suggests the campaign is indeed underway, hence the statement is considered likely true with high confidence.