Thank you for compiling and publishing the list! It looks like the IRS has changed the link for their exempt organizations search tool. [Edit because the forum auto-blocked the link as suspicious ] Domain is the same, but directory portion of the URL is now: /charities-non-profits/tax-exempt-organization-search

I'm hoping to have our educational nonprofit, the okTurtles Foundation, added to the list. On our donation page, we have two BTC addresses, with one supporting segwit.

okTurtles Foundation : 47-1188610 : Miami, FL : okturtles.org

Thanks