Machine-read testimony

Machine-read testimony is the body of statements about a brand that AI search systems actually read and weigh, as distinct from the links they were once assumed to count.

The phrase is the book's own, appearing in the publisher's description of its first chapter.

Practitioners describing the same phenomenon without the term tend to talk about what LLMs retrieve, or about the sources behind an AI Overview.

Testimony is what the pages say. Corroboration is what happens when several of them say the same thing. The first is the raw material of the second.

Where authority is a property a domain has, testimony is a property a passage has. A weak domain can carry strong testimony and frequently does.

The book contrasts testimony with plumbing, its name for the old authority-flow model, and says the same placement now gets judged twice, once as plumbing and once as testimony, with the second judging growing every month. Three buying criteria follow: relevance beats raw authority, accuracy beats anchor text, and breadth beats concentration.

Read about the book's argument.