According to news on December 23, in the name of "marketing, promotion and finding customers", sensitive information lists of participants in cryptocurrency industry activities were illegally sold, becoming a data treasure trove coveted by scammers and malicious actors. These lists detail participants' full names, phone numbers, nationalities, job titles, company affiliations, and personal and business social media links, often collected during the event registration process at a conference or breakout venue. Cointelegraph obtained a "sample" of lists from a seller via Telegram, including four lists from different campaigns, each with approximately 60 to 100 participants and containing different data points. Most of the events will take place in the fall of 2024, and participants will come from many countries including Southeast Asia and India. This suggests the existence of organized international blockchain activity participant data trading. These lists are just the tip of the iceberg, as sellers have also shared other sample images associated with Blockchain Fest and Devcon.