Interesting - I didn't know about the verifier role you mention (Peter Buchan). A search on him brings a range of interesting articles to read.

The Case against Peter Buchan, Sigrid Rieuwerts (a book chapter via JSTOR)

If you can't read the JSTOR version, it looks like it was shared here ("Bluegrass Messengers") Scroll down to the second article for this paper. Or here it is a downloadable PDF.

Wikipedia on Peter Buchan

Papers of and relating to Peter Buchan (1790 - 1854), and his family from JISC Archives Hub (in the UK)

The high-kilted muse: Peter Buchan and his secret songs of silence by M. Shoolbraid at ResearchGate

Notes: ResearchGate is a social networking site for scientists and researchers to share papers, ask and answer questions, and find collaborators. According to a study by Nature and an article in Times Higher Education, it is the largest academic social network in terms of active users. . . . Overall, this is a Pro-Science source, however caution is needed as some Predatory Research may slip through the cracks. (D. Van Zandt 5/17/2018)

Peter Buchan, 1790 - 1854. Collector of Scottish ballads National Galleries of Scotland, W. and A.K. Johnston.