#Hashcash
2 entries tagged Hashcash.
People (1)
- Adam Back Adam Back is a British cryptographer who invented the Hashcash proof-of-work scheme cited in the Bitcoin white paper, was the first person Satoshi Nakamoto is known to have emailed, co-founded the blockchain company Blockstream, and is a recurring Satoshi candidate that he denies.
Concepts (1)
- Hashcash Hashcash is the 1997 proof-of-work scheme that Adam Back devised to price email and deter spam by forcing a sender to compute a partial hash collision, and which the 2008 Bitcoin white paper cited as the model for the proof-of-work that secures the network and issues new coins.