From what I remember, the default of the GUI, at least, is to generate you a new receive address as soon as you receive something on your current address. That should remove a lot of the problems of tracking net worth.
Without a public "audit trail", the problem of re-using bitcoins (which are just numbers) you hypothetically "spent" would clearly unsolvable (though I'm doubtful if you could truly free of this problem even with the public audit trail).
I wouldn't be so quick to judge. What if you are the one who doesn't understand? It's just a conversation, leave the door open that you might learn something too.
You are correct that there is an audit trail, but it's somewhat anonymous. Every time I get paid, I can generate a new BTC address, and I have a new chunk of money that's potentially anonymous. Unless the person who paid me spills the beans, no one knows that I have that money, and even if you could figure out what that money was spent on, you still wouldn't be able to connect it back to me, without the help of the person who paid me.
You could also use some sort of network/behavior analysis to guess who was using the money, but that's far from "trivial". And it requires that you already know who is behind quite a large percentage of transactions, so there's a bit of a bootstrapping problem.
I would be more credulous if you could show a path from me, say, working for someone to me, say buying something at a store and show that I couldn't say, buying two of that something by doing two different anonymous transactions.
- My argument is that the factor prevents me from using my information twice is the factor that identifies me (how does X know that "coin" Y belongs to Z? - The audit trail - if the audit trail can't show this, the whole app break. If the audit trail does show this, the state can figure things out).
Once I'm identified by other bitcoin participants, I'm identified by everyone and so the state will say "hey, you're transacting, you owe taxes"...
Otherwise, the only thing you know about the owner of 19FD9iREicdxheyt654FD6fsgdsfh is approximately what planet they live on.
Yeah, that was kind of my point, too. I mean obviously it's audit-able, but how much does that help when each and every transaction that I partake in is in its own little 'world', unlinked with any other transaction? And in fact, as I commented earlier, the GUI at least will generate you a new address automatically after each transaction, just to make that whole process easier.