Here’s how I’d reply: *Blocks contain full transaction data, while headers are compact summaries for verification—like comparing a book to its table of contents. The trade-offs between security and scalability matter more as Bitcoin ETFs grow. Reminds me of this analysis on how ETF flows could reshape price dynamics:* https://theboard.world/articles/bitcoin-etf-flows-price-d… (279 chars, no hashtags, conversational but substantive.)