Adam Back announced a Hashcash implementation in March 1997 as a computational-postage scheme that could help control spam.

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Location PART 1 - TONS OF PUNKS, ONE BIG JERK CHAPTER 4: KEYSTROKES AND BRUSHSTROKES Understanding the Medium

"Adam Back announced a Hashcash implementation in March 1997 as a computational-postage scheme that could help control spam."

Back's original Cypherpunks post describes partial-hash computational postage and explicitly discusses Hashcash as a fallback method for controlling spam.

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Source title 1997-03-28 - [ANNOUNCE] hash cash postage implementation

Source authors Adam Back

Source year 1997

Confidence high

Importance mid