It is VERY easy to let such a contract/bond run like a Ponzi scheme (selling bonds for a high price, pay the payouts from the IPO initially and after half a year or so "disappear", have "hardware errors", "a medical condition" or more or less anything else that could make people panic-sell. After 15 days pay 105% of the lower-than-IPO price + keep the remaining BTC.
It takes far more than 1 year until something like the above becomes unprofitable for you as the issuer...
I'm quoting something you wrote in another thread, because I still have a hard time grasping your suggested failure mode.
If I'm going to lie, cheat and steal, I can do this even if I proved that I control the hashrate.
If I "disappear" then I've already failed the contract. If I have hardware errors I will still pay on schedule. If I have a medical condition my family will pick up the handling of the bond. If I do anything that indicates I'm going to call the bond, if anything it will create a panic buy since this increases its value.
If I somehow do manage to create a panic sell, I'll need the panic to continue during the month it takes to affect the call price. During which there are 13 coupons payments. If I pay them then I don't see why people would continue panicking, if not then I may as well not pay the calling price at all.
Anything I would do along the lines you suggest would be a massive hit on my reputation. And again, I can do this even if I provably have the hardware.
tl; dr: If you trust that I will fulfill the contract, you should believe me when I say I have hardware, or at least trust that I will not pull any blatant dirty tricks.
All that said, I think that with the first batch of hardware I'll average about 1 block per week. This means that it will take months to demonstrate a given hashrate with any accuracy, during which my mining is suboptimal. Also, since I don't personally have physical access to the hardware, it may be harder to supply the desired proof. I can see what I can do,
if I can be made to understand what good that will do, or at least see there is sufficient demand for this that understanding is not required.
PS The first batch of hardware hasn't arrived yet, but it should happen really soon.