According to @adam3us, an index compiling 200 Q&A explaining Bitcoin’s OP_RETURN was shared on Stacker News, with credit to @WalkerAmerica, and posted on Sep 13, 2025. source: Adam Back on X (Sep 13, 2025) OP_RETURN embeds small amounts of data in BTC transactions via provably unspendable outputs, and its data-carrier limits and standardness rules affect transaction size and fees. source: Bitcoin Core policy documentation; Bitcoin Wiki: OP_RETURN For traders, monitoring OP_RETURN usage can help interpret on-chain throughput and fee dynamics during periods of elevated data-carrier activity, aiding assessment of BTC transaction costs and miner-fee trends. source: Bitcoin Core fee estimation documentation; Bitcoin Wiki: OP_RETURN This curated Q&A provides a consolidated technical reference for understanding OP_RETURN mechanics relevant to transaction sizing, fee calculation, and indexing on Bitcoin. source: Adam Back on X (Sep 13, 2025)