Maybe I don't understand clearly how it works so apologise if this does not make sense...
But if a user settles more than 5% I will have some time to fill in my BTS collateral? Since I have the offsetting portfolio (which if I don't want ruin risk I can keep identical to the calculating feed (see below)), I can just liquidate 5% of that portfolio within the allowed time (is it 24h?) change it to BTS and settle, would it work?
For the price feed it would be the weighted average price of the underlying securities, as an actively managed portfolio such a weights will change at regular interval (say 1d but to make it simpler 1 month) and the weights will be left to the portfolio manager to decide. Ideally the PM will have some rules (like a prospectus in traditional funds) and should he move outside the boundaries pre-agreed the investor can simply settle and remove the funds.
I agree that with a UIA the process would be much simpler, the UIA is just a IOU to the investor (and will work a simple accounting measure). But in this case they will have full credit risk on the manager of the portfolio.
With a customized Smart Contract there will be a suitable level of collateral that will make the investor comfortable enough to invest (maybe we don't need 105% but say 60% is sufficient)... I would let the market settle that.
But as long as the manager:
- keeps the offsetting portfolio he has in line with the price feed
- monitor the inflows and outflows and liquidate/invest assets accordingly
- change the portfolio weights regularly
The manager should not face much ruin risk and hence the investor should be happy because its collateralised...