"In the case of the two registrations issued to Mr. Wright, during the examination process, the Office took note of the well-known pseudonym “Satoshi Nakamoto,” and asked the applicant to confirm that Craig Steven Wright was the author and claimant of the works being registered. Mr. Wright made that confirmation. This correspondence is part of the public registration record."

https://www.copyright.gov/press-media-info/press-updates.html?loclr=twcop