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Adam Back

Cryptographer who invented Hashcash, the proof-of-work system cited in the Bitcoin white paper, and later co-founded Blockstream.

Cryptographer who invented Hashcash, the proof-of-work system cited in the Bitcoin white paper, and later co-founded Blockstream.

Cryptographer who invented Hashcash, the proof-of-work system cited in the Bitcoin white paper, and later co-founded Blockstream. The linked coordinates show the person's projects, ideas, disputes and historical effects.

Inclusion documents influence, not endorsement. Separate verifiable work and public record from reputation, marketing and speculation.

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Influence is not endorsement

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Claims are linked to a source record

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Related entries show projects and disputes

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People do not control Bitcoin consensus

DOC · 001Adam Back — personal site and HashcashPrimary
Reviewed 25 July 2026Source-first · No investment advice