In a Q&A video on his YouTube channel posted on July 7, Bitcoin advocate Andreas Antonopoulos has said that Bitcoin is not a privacy coin. He added that it was unlikely that Bitcoin would add privacy features or implement those of popular privacy coin Monero (XMR).
Regarding the technical difficulties behind implementing privacy preserving features, Antonopoulos said that Bitcoin’s design wouldn’t allow for such changes as zero-knowledge proofs, stealth addresses and ring signatures. He also added that a lot of controversy would be generated if Bitcoin were to implement such changes.
Referring to Schnorr, Taproot, and Tapscript, privacy-oriented improvements that have been suggested by the development community, Antonopoulos believes that these will most likely bring some privacy changes, but they would not make Bitcoin a privacy coin.
I think what we’re going to see soon is Schnorr, Taproot, and Tapscript, which open the door to a lot of improvements. But they still do not involve zero-knowledge proofs or the types of ring signatures and stealth addresses that are done in Monero. Bitcoin is not a privacy coin.
Although he said that he would like to see more privacy in Bitcoin, he does not expect it to happen, noting that exchanges would come into conflict with authorities.