On December 123rd, it was reported that under the guise of “marketing, promotion, and finding customers,” sensitive information lists of participants in cryptocurrency industry events were illegally sold, becoming a data treasure trove coveted by scammers and malicious actors. These lists detailed the full names, phone numbers, nationalities, positions, companies, and personal and business social media links of participants, which are often collected during the event registration process at conferences or sub-venues. Cointelegraph obtained a “sample” of the list from a seller via Telegram, which included four lists from different events, each with about 60 to 100 participants and containing different data points. The events mostly took place in the fall of 2024, and the participants came from multiple countries, including Southeast Asia and India. This indicates the existence of organized international blockchain event participant data trading. These lists are just the tip of the iceberg, as the seller also shared other sample images related to Blockchain Fest and Devcon.