If the merchant revealed her address, nothing would be private.
Zcash or Monero are more well suited for this kind of transacting, Zcash was conceived with this precise kind of transaction in kind, or a Birthday present for example on the positive side.
Was zcash in existence by 2014?
Yes, in 2011 it was already being drafted on a white paper to resolve these privacy issues pertaining to psuedoanonymous identifiers being used as addresses.
Adam Back complemented the developments as being potentially required if the big brother state figured out how to beat Bitcoins weak privacy preserving layers.
Do you know who Adam Back is?
No I don’t know who Adam back is. Is he the developer?
Adam Back invented, what is mining. Hash Cash was his baby, which bitcoins SHA-256 algo was based on. Adam Back is one of a handful of developers who interacted with the satoshi nakamoto alias early in bitcoins development.
I am very supportive of Adam Backs work on PoW.