https://www.havelockinvestments.com/fund.php?symbol=B.EXCHhttps://bitcointalksearch.org/topic/havelock-bitcoin-difficulty-derivative-bdd-430137Just crunching some numbers let me know what you guys think.
Mining with an antminer S9 vs buying B.Exch on havelock:
Antminer hashrate is 12.93 Th/s, one B.mine contract is equal to .25Th/s, so one B.mine contract is equal to 1/51.72. The S9 cost 3.05 Btc; if you divide that by 51.72 you get .05897. So that would be the bitmain equivalent cost of .25Th/s, only you don't need to buy a psu, pay pool fees, or pay the electricity cost to run the miner.
Currently you can buy the B.exch contract for .05945 which gives you one B.mine contract and one B.sell contract meaning you are paying .00048 premium for the B.sell contract and getting the B.mine contract for a discount to bitmain when you consider the cost of electricity and set up.
It looks as though when the block reward halving comes the fund will have just about 180 days of mining dividend in it (the threshold for the sell dividend payout). So any new purchases of the B.exch should result in a payout for the B.sell holders. Each purchase of B.exch will add .05945 to the fund if you divide that by 358 (contracts outstanding) you get a .000166 divided payout for each share of B.sell you own if difficulty stays the same. If this raises then the payout will be higher.
In closing it looks to me that if you want to earn BTC from mining then you are better off buying B.exch then buying an antminer S9, it's cheaper when you consider pool fees and electricity, and comes with a built in hedge in case the difficulty rises.