new research based on drone footage and sediment samples, suggests that the 5200-hole earthwork on Monte Sierpe in Peru was used for barter during Chincha and Inca eras: https://doi.org/10.15184/aqy.2025.10237
or as Dr. Jacob Bongers puts it: "This site may have been used as a large-scale accounting device, sort of like the Excel spreadsheet of the Inca empire" → https://youtube.com/shorts/n67JQCpvy0M
what's more, the structure appears to match the structure of a khipo/quipo found in the same valley!

