Collection #1 is a massive credential-stuffing compilation built from thousands of earlier breaches. leaksear.ch indexes 2.69B records containing email addresses with plaintext or hashed passwords, creating risk for anyone who reused credentials.
ALIEN TXTBASE is a Telegram-distributed infostealer log corpus with a leaksear.ch indexed count of 8,638,292,855 records. This replacement article distinguishes that count from HIBP's public 23B row and 284M unique email figures and summarizes the searchable fields, stored context fields, and public incident reporting.