Arden
Vyemm Raider
This was Hashcash created by Adam Back and referenced in the Bitcoin Whitepaper and was a primary influence in the creation of the Proof-of-work system combined with a difficulty adjustment Satoshi invented, solving the Byzantine General problem. Worth understanding at a basic level if you're into this space as the idea is fundamental to how all this works.
Hashcash - Wikipedia
en.wikipedia.org
Basically a pow source of friction instead of a monetary one.
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