An unknown person or group may be collecting the IP addresses of Bitcoin (BTC) users and linking them to their BTC addresses, violating the privacy of these users, according to a blog post from pseudonymous Bitcoin app developer 0xB10C. 

0xB10C calls the entity “LinkingLion” because the IP addresses associated with it pass through LionLink network's colocation data center. However, ARIN and RIPE registry information reveal that this company is probably not the originator of the messages, according to 0xB10C.