No.
He was Trump's personal attorney.
I don't think he was Maxwell's defence attorney.
Wiki just says this, that he had a relationship with Maxwell's lawyer.
In leading certain responsibilities of the handling of the Epstein files,
The New York Times described Blanche as having an "unusual, Janus-faced position". Although Blanche's involvement with Trump, an Epstein associate, was not believed to be a conflict-of-interest, it presented a complex situation. According to the
Times, he personally signed the Department of Justice's motion to unseal grand jury testimony in the case against
Ghislaine Maxwell, Epstein's accomplice, after the prosecutor who worked on the Epstein and Maxwell cases,
Maurene Comey, was fired. Additionally, Blanche had a personal relationship with David Oscar Markus, Maxwell's counsel.
[47] In July, Blanche requested a meeting with Maxwell.
[48] In preparation for the meeting, Blanche allowed Markus to access grand jury testimony, a move that could have allowed Maxwell to obtain information useful in seeking an appeal for her conviction.
[47]