Following up Ken’s and Matthew’s suggestion, here are some sources on guthis in Nepal < goṣṭḥī in Licchavi inscriptions:
Bernhard Kölver and Hemraj Śakya, Documents from the Rudravarna-Mahävihära, Pätan. 1. Sales and Mortgages
(1985), esp. disc. on pp. 18–21.
U. N. Sinha, Development of Panchayats in Nepal (Patna, 1973, chapter IV.
John K. Locke, Buddhist Monasteries of Nepal (Kathmandu: Sahayogi Press, 1985), esp. pp. 10, 14, and passim.
You may wish to look into the surviving, vestigial manifestation, in the form of the guṭhī
of Newar society in Kathmandu. There is a Wikipedia article on the subject
https://en.wikipedia.org/wiki/Guthi
(though it's misspelled there with a dental instead of retroflex
consonant). But I imagine that the literature on Newar sociology and anthropology with have more - perhaps some of the others on the list
can help with bibliography in that area.
Matthew
Matthew Kapstein
Directeur
d'études,
Ecole Pratique des Hautes Etudes
Numata Visiting Professor of Buddhist Studies,
The University of Chicago