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Fist bitcoins in, First out.

Will this assumption allow individual bitcoin tracking possible?

example,

Addresses A, B and C each has 50 BTC

Transactions, 

  tx1 - A > D - 10 BTC (D - 10 BTC)
  tx2 - B > D - 15 BTC (D - 25 BTC)
  tx3 - C > D - 20 BTC (D - 45 BTC)

  tx4 - D > E - 20 BTC (E - 20 BTC, D - 25 BTC)

  Now,
    D has none of BTC received from A, 5 BTC from B and 20 BTC from C
    E, fist 10 BTC was received from A, next 10 BTC was received from B
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related question (1), bitcoin.stackexchange.com/questions/450/… –  vi.su. Feb 18 '13 at 8:42
    
Yes, but it's not a meaningful metric, if, say, the bitcoins were sold. –  Nick ODell Feb 18 '13 at 9:36
    
Would you do this for transaction fees as well? –  David Schwartz Feb 20 '13 at 1:23
    
transaction fees? yes, but only if it is > 1 satoshi. :) –  vi.su. Feb 20 '13 at 1:47

1 Answer 1

This is only true if one does not mix transactions. Otherwise you will have coins that are for example 50% from source A, 10% from B, 40% from C and so forth.

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you are right. mixing services only could make it very difficult. blockchain doesn't know anything about intermediate addresses. –  vi.su. Feb 18 '13 at 9:19
    
@vi.su. If someone set up a mixing service properly to completely separate various coins, it would be nearly untraceable, or at least highly deniable. –  ThePiachu Feb 18 '13 at 9:46

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