So which three of these addressess should I send my Certified letters to?

HashFast Technologies, Inc.
97 South Second Street #175
San Jose, 95113 United States

HashFast Technologies LLC
649 Mission Street 5th Floor
San Francisco, CA 90291
USA

HashFast Technologies LLC (“HashFast”)
100 Bush Street, Suite 650
San Francisco, California 94104, United States

They sure do seem to be moving a lot...