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I'm writing a scifi novel set about 150 years from now, where digital coin is standard.
Part of the plot needs the hero to join the dots from a single bitcoin-like transaction to other clues.
I wanted to ask:-
1) is it possible to trace the expenditures / receipts relating to a single public key via the blockchain?
2) is it possible to trace movements of bits from one public key to another to form a relational "tree" of where money has come from / gone?
3) what kind of mechanisms would someone use to "launder" bits, so they were clean? I don't really care how it works at the binary level, just need to know the names / basics of some techniques.
I don't want to trace back to whoever owns the key, just to know if you can link / see other connected Transactions, and if hey can be obfuscated. It's one piece of a larger real-world puzzle.
Not a bitcoin expert – I want to get these details right to avoid nerdflames.
Thanks for your help.