ソース:[1] September Bitcoin On-Chain NFT Transaction Volume Less Than $50 Million, Setting a New Low Since May 2023 - TechFlow (https://www.techflowpost.com/newsletter/detai ...)[2] NFT Sales Plunge In September, Down 25% From August 2025 - Inside Bitcoins (https://vertexaisearch.cloud.google.com/groun ...)[3] Bitcoin Ordinals' Sales Volume Plummets Over 97% Since May Peak: DappRadar (https://vertexaisearch.cloud.google.com/groun ...)