Thanks for the reply!

I think you will find that the "distributed ledger" system such as Ripple uses will be "the" dominant system in the future, mainly because of the many problems associated with Blockchains. Blockchain technology, such as Bitcoin uses, is just too slow to be taken seriously for international transactions. The distributed Ledger System is also a lot more secure, and as yet has not been subject to hacking as the Blockchain system has.

"Once hailed as unhackable, blockchains are now getting hacked
More and more security holes are appearing in cryptocurrency and smart contract platforms, and some are fundamental to the way they were built."
https://www.technologyreview.com/s/612974/once-hailed-as-unhackable-blockchains-are-now-getting-hacked/

The Difference Between Blockchains & Distributed Ledger Technology
https://medium.com/@markusandersson/the-difference-between-blockchains-distributed-ledger-technology-a0fe4ba3d316

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