[Cryptography] Robust Linked Timestamps without Proof of Work.

[Allen]

>
> From one perspective, I suppose, though on the other hand you can't just
> take a million dollars and buy a day's worth of hashing power - most of the
> existing hashpower isn't for sale. To purchase enough new hashing power
> to own 50% of the Bitcoin network (1,487,398 TH/S) would cost
> approximately 114,415 Antminer S9 (13 TH/S) units at $2,500, or *$286m** in
> hardware costs *and 1.4 KW * 114,415 * $0.08 KW/H, or *$12,815** an hour
> in electricity costs*. Except for the small fact that there aren't that
> many S9 units available for purchase either...
>

Are you sure about that?  Because I think for about $100K or so I could
take over a whole mining pool, which would give me 1/3 of the hashing power
on the bitcoin network.  I think 50% of the bitcoin hashing power could be
pnwned for a lot less than people think...
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