ソース:[1] VanEck Crypto Monthly Recap For August 2025 (https://seekingalpha.com/article/4819926-vane ...)[2] $4.6 Billion Options Expiry Sparks Volatility Concerns for Bitcoin and Ethereum - Mitrade (https://www.mitrade.com/news/crypto-news/4-6- ...)[3] 'September Effect' Amplifies Market Volatility as U.S. Indexes Retreat from August Gains (https://vertexaisearch.cloud.google.com/groun ...)