What would prevent them from building their own blockchain? There is not really a need to use the bitcoin blockchain right?
Banks would need to use the same blockchain to make transactions though, which could complicate things..
Banks would need to use the same blockchain to make transactions though, which could complicate things..
Here's how one of the world's biggest banks wants to use bitcoin technology
Banks mostly aren't interested in bitcoin, but they are interested in the software that runs the digital currency — the blockchain.
...
Belinky told BI: "We’re very excited about distributed ledgers and blockchain technology. They really have the potential to disrupt many of the basic processes we have underlying our transactional products."
"What we see as the foundation use case, which is international payments, we don’t really need a coalition of 50 banks to make it work. We have ten major geographies. Just us connecting our ten major geographies will allow 100 million customers to make instant payments worldwide. If we partner with two or three banks similar to us we’ve got pretty much global coverage."
But Faura adds: "This thing will only be interesting if many banks take part and collaborate. We are talking and experimenting with several banks."
http://uk.businessinsider.com/santander-has-20-25-use-cases-for-bitcoins-blockchain-technology-everyday-banking-2015-6?r=US
good luck with your intranet - i hope the other banks dont cheat...
xD 
