How do you know which Bitcoin you are spending?

I have purchasing Bitcoin using DCA, but my question is when I make purchases how do I know which of my Bitcoins I am spending. I have purchased Bitcoin anywhere from $3500 to $11,000 in the past 3 years without the intent of spending any. There have been a few opportunities that have come so I have been using Bitcoin to make purchases. This is the one part that I do not understand and would appreciate any insight.


use a tracker like, this will help you calculate based on FIFO (first in first out)

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