Just discovered that Apple is using Hashcash in their oauth header for iMessage (and maybe other products?).
https://github.com/beeper/imessage/blob/2c45fc5619cbc33f2441cb07fedb3ca18604ee89/imessage/appleid/hashcash.go
But, isn't that wasting power?
Or has Proof of Work got a utility and it actually makes sense to use it?
😏🫂
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