On December 23, news broke that under the guise of 'marketing, promotion, and client acquisition,' a list of sensitive information of participants in 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, which are often collected during the registration process for conferences or breakout sessions. Cointelegraph obtained a 'sample' of the list from a seller via Telegram, including four lists from different events, each containing approximately 60 to 100 participants and various data points. The events mostly took place in the fall of 2024, with participants from multiple countries, including Southeast Asia and India. This indicates the existence of organized international data trading of blockchain activity participants. These lists are just the tip of the iceberg; the seller also shared other sample images related to Blockchain Fest and Devcon.