Thanks for the reply!
All of the documentation for each approach is linked directly in the text as hyperlinks in-line, but I'm dropping the key documentation here as well to be sure you can access it:
Initial "stealth address" proposal: https://www.mail-archive.com/bitcoin-development@lists.sourceforge.net/msg03613.html BIP 47: https://bips.dev/47/ PayNyms, an implementation of BIP 47: https://samouraiwallet.com/paynym Silent Payments: https://gist.github.com/RubenSomsen/c43b79517e7cb701ebf77eec6dbb46b8 Private Payments: https://bips.dev/351/