What technology was being used for peer-to-peer consensus before blockchain arrived on the scene?
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IBM discovered proof of work and proof of stake concepts way before blockchain became a thing.
To my knowledge none other than direct communication between wallets and exchanges. For more info you are most welcome to join our highly engaged and active Facebook crypto group for more insights, analysis, discussions, ICOs, trading, predictions, bitcoin, altcoin and news: https://www.facebook.com/groups/cryptofans/