Bitcoin is not the first Digital currency created but I think the first cryptocurrency created which is decentralized. I think there's an article written by investopedia somewhere in the internet. It's an interesting read, try it.
Is the article u said is this one?
https://www.investopedia.com/terms/b/bitcoin.asp , but then again it may not be the first digital currency created but look where is bitcoin now? if it surpassed the old currency that are made from the past maybe it would even surpassed the one we have today.
I just want to share this article that I've read and I hope it can help somebody, and it's very interesting to read also, thumbs up to this article, the summary of it is a currency a digital currency game, the asset called PDE (Project Entorpia Dollars).
The game itself called is Entropia universe which is released on time of 2003, which players able to earn money, real money.
Article:
https://steemit.com/gaming/@enjar/bitcoin-not-first-digital-currency-i-profited-from