[bo1024]

Interesting point. A big problem with blockchain-style ledgers is that the definition of "ownership" is nebulous and far from instant, only increasing in certainty over time. We each might have a different time frame before we're sure a transaction has taken place.

If there's a particular group responsible for paying out the security, then it makes more sense to me for that group to just host a ledger on their site and officially endorse all transactions (which can use the same crypto that blockchains use). This would be instant and transparent.

I don't understand how security trading works, but if there is truly no trusted authority responsible for either paying out the security or enforcing that it gets paid, then I guess I see the possibility for using a blockchain (but probably you also would want cryptocurrency...).