On December 123, news emerged that under the guise of 'marketing, promotion, and customer acquisition,' a list of sensitive information about participants in the cryptocurrency industry activities was illegally sold, becoming a treasure trove of data coveted by scammers and malicious actors. These lists detail participants' full names, phone numbers, nationalities, positions, affiliated companies, and personal and business social media links, often collected during event registrations at conferences or breakout sessions. Cointelegraph obtained a 'sample' of the lists from a seller via Telegram, including four lists from different events, each containing about 60 to 100 participants and various data points. The events mostly took place in the fall of 2024, with participants from several countries, including Southeast Asia and India. This indicates the existence of organized international data trading involving participants of blockchain activities. These lists are just the tip of the iceberg, as the seller also shared additional sample images associated with Blockchain Fest and Devcon.