You forgot an important word there that's also your username.
There were lots of digital money systems that worked but were centralized.
Re:Bitcoin's Academic Pedigree
by decentralised on Tuesday September 05, 2017 @11:48AM
(#15176371)
:-)
All money systems are digital money systems. Source: 20 years in FinTech.
What makes it special is that it was the first digital money that actually works.