But in any other case, how could Big Brother possibly add your "more info" if all transaction in the past are fulfilled?
Imagine that weight of a real (weight = 100%) link between IN and OUT is 5% (that's how Big Brother sees it). U use this OUT to buy something from a website that is later seized by BB. Now he knows one of ur real IPs, this increases that link weight from 5% to 12%.
Even worse, some other guy reveals his real transactions, this automatically increases weights of all the other links involved into the same mixing session.
And the other thing: what's the issue with the 'joincoin approach'? I.e. if n senders sends 5Nxts then n receiver receives 5Nxts. So, nobody could differentiate who exactly transferred whom 5Nxt. They send collectively n*5 Nxts and they receive collectively n*5 Nxts.
"
nobody could differentiate who exactly transferred whom 5Nxt" is correct, but actually some non-zero probability is enough to use approach described above to deanonymize u.
