By popular request, here is an explanation, video demo, and proof of concept website where I demonstrate my first privacy tech for bitcoin: #WhisperAddresses. https://github.com/supertestnet/whisper-addresses
Try it out on bitcoin's testnet. Or mainnet, if you like. In addition to helping with censorship resistance, it's also a way to generate fresh donation addresses on a blog without btcpay -- just copy/paste some javascript.