Exactly. I had another look at the block explorer and docs, then made a correction comment and came to the same conclusion

> it's impossible to know which is the true spend Not impossible. My tool *automatically* detects the true spend 1 in 15 times. Better tools (like ciphertrace's) do better. Lightning is superior.

you can't stop lying can you? you are using heuristic analysis, which is NOT a deterministic relationship. your tool identfies the *likely true spend at a certain (undefined) probability and it does it no better than random chance (but automatically! 🙄) I suggest if you're actually interested in operating in good faith you prioritize telling the user the probability your heuristic analysis is accurate. ie, the odds an old ouput decoy WOULD be used in a ring etc

thank you, that (final paragraph) is excellent feedback and a very good idea