Ok, that's good, that closes a lot of attack vectors (e.g. creating fake jobs to collect TX_BOUNTIES).
Or rather their tax deposits, right? Well, yes that would be not possible here.
What do you think about this scheme ... for now these were just random thoughts that popped into my head this morning.

Well, I like it, but I have close to zero technical understanding, therefore what I like or not isn't exactly important

Yeah, I meant the deposits.
I'm not sure, where unclaimed deposits should go to, though
Initially, I liked the idea to put them in the bounty pool, but that would not penalize every form of malicious activity. A miner could make lots of deposits, if they can be sure that they get them back, once they find (or already have) a valid solution
Although I don't see why a miner would do this instead of sending in the right solution and just claim the bounty.
unclaimed deposits ? Has XEL distributed yet or has anyone claimed their deposits yet ? I'm confused !
No, mainnet hasn't started.
I guess you have to read a few posts back to know what I mean, but I admit that the way I wrote it is a little misleading

By deposit I mean XEL that is paid to send a hash (TX_BOUNTY) before the solution is sent (TX_BOUNTY_REVEAL). This is a means to prevent spamming the network and the question is, where does this deposit go?
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Just a note, that it seems your discussion goes more ad more towards a mining-only solution, but the origin of XEL is/was to make it decentralized supercomputer that is capable of doing various types of computations, ie. distributed rendering (like Golem's current main focus), and potentially scientific applications too.
What I mean is that basically the terminology should be general enough to cover as many as possible potential applications.
If it looks that way, it probably is because at the moment, there are a lot of discussions about very specific cases. Sometimes, you get lost in the details, but the main goal hasn't changed.