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 There’s all sorts of atomic swaps available these days 
 can atomic swap guarantee you to have not tainted coin ? 
 I think that depends on the service? 
 what?
how does one define "taint"?

the whole point is that taint is an arbitrary Chainanal and CEX definition we have no control over.
its a byproduct of a transparent ledger.

therefore two UTXOS with different histories are nonfungible by definition.

1 btc != 1 btc 
 In my definition a tainted coin is a coin is one that’s been moved after minting 
 lol 
well its a good thing we dont have to worry too much about your definition  
 Yes