Powell told courts that the witness is an expert who could show that overseas corporations helped shift votes to President-elect Joe Biden. The witness’s identity must be concealed from the public, Powell has said, to protect her “reputation, professional career and personal safety.”

The Washington Post identified the witness by determining that portions of her affidavit match, sometimes verbatim, a blog post that the pro-Trump podcaster Terpsichore Maras-Lindeman published in November 2019. In an interview, Maras-Lindeman confirmed that she wrote the affidavit and said she viewed it as her contribution to a fight against the theft of the election.

“This is everybody’s duty,” she said. “It’s just not fair.”

In a recent civil fraud case, attorneys for the state of North Dakota said that Maras-Lindeman falsely claimed to be a medical doctor and to have both a PhD and an MBA. They said she used multiple aliases and social security numbers and created exaggerated online résumés as part of what they called “a persistent effort . . . to deceive others.”