I've gotten messages from a few people asking how they can support my research. At the moment, the main roadblocks are time and money; time to learn/translate Japanese, and money to buy examples to illustrate the eventual book. While I don't expect anyone to donate anything toward what is technically just my own coin collection, I do think it could be useful to offer some nice, downloadable references that are more polished than the website. I've set the prices very low, but Ko-Fi allows you to pay whatever you'd like, allowing you to support the project however you see fit. I do want to be sure to point out that all of the information available here is also on my website for free. It's often harder to find, less user friendly, summarized, or in a different format (video vs. in writing), but it is there. I eventually plan to make all/most of these materials free in conjunction with the eventual release of the book, likely as a PDF of supplementary materials on the NNP. If there's anything you'd like to see available, let me know! You can message me on Ko-Fi or send me a message here: https://rectanglecoins.com/contact-me I don't mind if I never sell a single thing here; I'm just happy that people are interested in my research and excited to read the final book. Thank you for visiting!