Improving Bitcoin Baselayer Privacy with Dandelion++

"Dandelion was first proposed for Bitcoin routing on the Bitcoin mailing list in 2018, and has since been improved in Dandelion++, Dandelion Lite and Clover, and has been implemented in privacy first currencies and protocols like Monero and Mimblewimble. On Bitcoin, the implementation of Dandelion was rejected due to Denial of Service concerns."

https://www.nobsbitcoin.com/improving-baselayer-privacy-with-dandelion/