I'm learning about proof of stake and I'm kinda confused. Most sources I've come across say that the first proof of stake was peercoin but it was a mix with proof of work or something, and then there were NXT, blackcoin, and several others.
But then I also see a project called Algorand claiming they’re the first “pure proof of stake” platform. What is the difference? Does that mean Algorand is the first proof of stake? This is so confusing..
And if it’s not correct, why are they claiming it?