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Disintermediation of financial transactions could be a massive market. It is the accounting software yes. But it is also the network of types of transactions and types of players. There will be winners and losers. There will eventually be IPOs.
What is unique is that what ever it is being exchanged is standardized on a particular network set up for that type of transaction. It is secure because it is distributed. Everyone has a copy of the ledger and my guess is nobody is going to be using Chromebook computers for this. Me, I would immediately back up my computer upon my execution, buy or sell, of a trade. There will be so many copies of the accounting ledger that nobody can fraudulently change it and the transaction is there for all to see who are part of the network.
I am sure that they will find a way for banks or brokerages to immediately transfer funds on a trade based on the faith they have in the network. And I would think like credit cards the software can inquire if the funds are available. The network may not have to have a whole lot of money reserved to back up failed trades like clearing houses do.
I think there is going to be a lot of competing networks and within a type of financial instrument there will eventually be a consolidation with one or three big players.