In other words, lets say some large exchange or whale is holding 10k BTC on a single addy, just send 1 satoshi of tainted BTC to this addy and the whole stack is worthless.
Or even worse, send 1 tainted satoshi to all public known collectible coin addresses... many manufactures has published the addies, so this is possible to do.
I don't think so.
My opinion on that matter is that, if what you explain in your example was to happen, then it would be either :
- A transaction using two inputs, a 10k BTC "clean" input, and a 1 satoshi "tainted input" and that will be publicly visible.
- Possible to use Coin Control to spend only the 10k BTC input that was received to the address, and leaving the tainted 1 satoshi sleep forever on that address.
If you did not overload a physical coin, then you should spend only the input that was produced by manufacturer.
Bitcoin Core and Electrum allow for Coin Control features.
And ... in the end ... Tim Draper doesn't complain that much about the fact, a huge stash of his coins is "Silk road" tainted.
Does an auction by the US States cleanses the bitcoin from all evil ? Pretty rad.