Court documents released by Craig Wright’s legal defense against Ira Kleiman on 06/11/2019 have confirmed in a legal setting that he mined the first 70 blocks of Bitcoin.
Dr. Craig Wright Confirms He Mined the First 70 Bitcoin Blocks
"Everything that was used to mine after the 70th block was placed into an encrypted file including all information pertaining to the addresses. The private key needed to access these files were split into multiple key shares using a version of “Shamir’s Secret Sharing Algorithm” which provides a method for splitting something like a private encryption key into multiple parts. The parts of the key were spread to multiple participants in the trust. This goes some way to explain why Dr. Wright has been unable to provide the public addresses for the bitcoin held by the trust (the addresses for the coins mined after block 70). "
https://www.yours.org/content/dr-craig-wright-confirms-he-mined-the-first-70-bitcoin-blocks-6d06fdd34fca