A couple more clarifications of the clarifications, for clarifications' sake...
3) When shares are sold, bitcoin are not necessarily sold at any external exchange.
The same is true of all ETPs: shares can be traded back and forth between different holders all day long, sometimes adding up to a significant percentage of the total shares outstanding. That need not have any impact at all on the circulation of the underlying entity in the broader economy. Likewise, you and I could trade 1 Bitcoin back and forth between ourselves all day long if we wanted.
Is there a potential confusion here between shares being sold (traded from one holder to another) and shares being redeemed (converted from shares into Bitcoins)?
4) Shares can be sold short, through the use of collateral.
5) The Collateral need not be bitcoin (it likely rarely or never will be).
I wonder whether there might be some confusion created by two completely different uses of the word 'collateral'? In the case of collateral for shorting, the word refers to nothing more than something of value which the short seller provides to the entity who is providing whatever it is they are short selling. The short seller provides the collateral to secure their commitment to later cough up the cash to re-purchase whatever it is they bought to sell short and return it to the entity which provided it in the first place. It would make no sense at all for the collateral
ever to be identical to the thing which is being sold short, because if the short seller already had it, they could just sell it, not short sell it.
In the fiat world, collateral is normally the rest of the investor's equity portfolio plus cash.
But
this use of the word 'collateral' has nothing at all to do with what backs the ETF itself. If I want to short sell some Google, and my portfolio has sufficient value to collateralise my short sale, nobody complains that I am not putting up some Google before I short Google, and nobody suggests that my short sale is somehow going to leak Googleness out of Google or break the link between Google shares and underlying Google.
6) There is no firm linkage between shares value and bitcoin value (share value is somewhat linked to Audited Net Asset Value of the trust, not to value of bitcoins held in the trust).
Hmm, here again, I wonder whether some readers could find this confusing...
If, by "share value", you mean "the value of a share as set by the market" (i.e.,
price), then generally speaking there is never any such linkage except that which is enforced by arbitrageurs. (Provided that can be done; in the case of closed end funds, the price may vary by quite a bit relative to net asset value.)
If, however, you mean "the value of the underlying Bitcoins held by the trust", then the share value is,
by definition, the net asset value of those Bitcoins per share.
7) Redemption of shares may not give you Bitcoin, the debt may be settled through fiat, redemption may not be honored for legal reason, or logistical reason.
On the contrary, redemption of shares by Authorized Participants
always yields Bitcoins delivered to the AP by the trust. The passage in the S-1 which you've referred to previously is describing the process which will be followed if the AP fails to deliver a basket of shares to be redeemed by 9:00 a.m. on a particular day of the week, not the other way around. In other words, the passage about collateralization of that commitment, etc., etc., has nothing to do with failure by the trust to redeem shares in Bitcoin, it has to do with failure of the AP to deliver shares when redeeming for Bitcoin.
8. No bitcoins are need to be borrowed from anyone for the selling short of ETF shares (ETF shares are lent not bitcoin).
Naturally, no Bitcoins need to be borrowed from anyone prior to short selling ETF shares, since the requirement is for ETF shares to be borrowed.
10) Short selling of ETF shares is not so much limited by the amount of bitcoin in the vault of the trust as it is limited by the ability of short sellers to post adequate collateral (in say, Euros, US Dollars, Mortgage Backed Securities, or whatever is accepted).
The short selling of ETF shares is very precisely limited by the number of ETF shares available to be shorted.
If what you're referring to is actually the practice of
naked short selling -- selling something that you have not first borrowed -- then clearly that has nothing to do with collateral, or Bitcoins, or anything else that is specific to this example. Naked short selling is a broader issue, and abusive naked short selling in particular brings with it a whole raft of legal considerations.
Then the ETF share price can be driven to up or down highly without increasing or decrementing the bitcoins available to the market from the trust.
If the problem you're getting at is just that, like any other commodity ETF, the trust must hold some of the underlying entity (in this case, Bitcoins) in order to exist at all, then that seems to me an entirely different discussion than all of the above about collateral and redemption and the difference between trading and redeeming.