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Fist bitcoins in, First out.

Will this assumption allow individual bitcoin tracking possible?


Addresses A, B and C each has 50 BTC


  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)

    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),… – 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. :) – Feb 20 '13 at 1:47

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. – Feb 18 '13 at 9:19 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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