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Background
I have a relative who has been trying to get into Bitcoin mining. He accidentally installed malware onto his home PC twice, thinking it was a mining tool. He understands mathematics but is not well versed with modern technology, PCs, etc.
Question
What sort of hardware/software/etc would I purchase if I want to have a standalone device sitting (quietly) in the corner of my office that would have a reasonable expectation (95%+ CI) of earning a single coin within, ideally, 6 months? The power/hydro bill isn't a problem, as I'll be paying it. It's to my understanding that I need to consider ASIC/FPGA-based boards to be remotely competitive.
Goal
My goal is to pre-mine a single coin, give him the box as a birthday present, and have a cron job add the coin to his wallet at a set date. I think it'd make his day (day he always felt lucky).
Additional info
How do I help him legitimately cash-out his single bitcoin, so that the bulk of the face-value is cashed out, and he has a receipt he can file properly at tax time?
You can pre-mine a block, but that might become invalid if you sit on it too long. – jiggunjer – 2017-10-03T07:15:41.650
@jiggunjer what? How do you 'pre-mine a block'? – MeshCollider – 2017-10-03T11:56:36.690
@meshcollider I'm not sure, I just figured it would be theoretically possible. You just need to not broadcast it when finished? – jiggunjer – 2017-10-03T15:22:00.143
1@MeshCollider After looking through this more thoroughly, your assertion sounds correct. If you convert that comment to an answer, I'll mark it "accepted". Thanks. – Cloud – 2017-10-03T17:06:12.003
@jiggunjer mining is a race, if you didn't broadcast it when finished you'd be wasting your time completely and would get nothing because someone else would find a block and yours wouldnt make it into the chain – MeshCollider – 2017-10-03T18:08:04.890