What is the current state of the Hashcash protocol that is cited in the Bitcoin whitepaper?

What is the current state of the Hashcash protocol that is cited in the Bitcoin whitepaper?

I have been reading the Hashcash paper which is referenced in the Bitcoin whitepaper. I would like to know what is the current state of the Hashcash protocol and what are the services that are actively using it?

http://bit.ly/2QRSj29

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