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One of the first proposals for blockchain was a email with a minuscule, verifiable fee to make email spam uneconomical.

Spamming emails is one of the cheapest things you can do with a network connection. Even $1 per 1,000 emails would make spam untenable.

And the first proposal for proof-of-work was having emails include a proof-of-work to make it computationally expensive to mass-send emails.

I'd rather have my ISP donate 0,1 cent to some national park foundation when I send an email or whatever than have me waste power though.