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I wonder how many wallets you would need before it becomes a problem to track. I would guess in the millions or more since graph algorithms are pretty efficient these days.

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And there is the issue that what is inefficient today may become efficient tomorrow. The blockchain will be there waiting for new forensic techniques.

How long of a linked list do you need to be unable to reach its tail?

There are exchanges which allow transactions from e.g bitcoin to monero. As soon as you’re on such a private chain, you most likely broke the link.

I was thinking more along the lines of a directed graph where each of the wallets pass the funding received to multiple other wallets before the money finally converges to a destination wallet, it doesn't have to be a straight linked-list style line of wallets.

In any case, the transaction costs alone probably makes this prohibitive for more than a few dozen wallets.

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