Entries tagged with this topic. Spans across types and sources — explore connections between people, events, and themes.
13 entries
Adam Back's reply enumerating seven monetary-design issues in b-money and proposing Hashcash as its minting mechanism: "to create value you burn CPU time, just like with hashcash."
The earliest known email from Satoshi Nakamoto: contacting Adam Back to verify the Hashcash citation and sharing a pre-release draft titled 'Electronic Cash Without a Trusted Third Party'.
Adam Back announces Hashcash to the Cypherpunks list — a proof-of-work postage scheme against spam, framed within the digital-cash discourse as a stop-gap or fallback for digicash.
Adam Back replies to Wei Dai on Cypherpunks, identifying seven monetary-design issues in b-money and proposing Hashcash as the minting mechanism — a substantive analysis ten years before Bitcoin.
Bitcoin v0.1 reuses one cypherpunk primitive (PoW from Hashcash), borrows general CS components (Merkle trees, linked timestamping, ECDSA), and synthesizes the rest (UTXO, mining, 21M cap, P2P).
Hashcash's inventor and the first person Satoshi contacted. In April 2026 the NYT named him the closest stylometric match among 620 cryptography-mailing-list writers. The evidence, weighed.
Satoshi thanks Adam Back for the b-money reference and reveals he was not previously aware of Wei Dai's proposal. Historically significant line: 'my ideas start from exactly that point.'
Adam Back suggests Satoshi look at Ron Rivest's 1996 MicroMint paper on k-way hash collisions. Back admits he has not yet read the draft — a decision he later called 'probably my biggest mistake.'
Satoshi writes Adam Back for the final time, thanking him for paper suggestions and announcing the Bitcoin software launch. Includes Hal Finney's project overview from the Cryptography mailing list.
John Levine dismisses Bitcoin's security assumption — botnet operators control 100,000+ machine zombie farms, and hashcash failed for the same reason: bad guys outweigh good guys computationally.
Adam Back reflects on his August 2008 email exchange with Satoshi, his regret at not reading the whitepaper carefully, and his COPA v Wright testimony where the complete chain became public.
Satoshi Nakamoto's earliest known email. He contacts Adam Back to verify the Hashcash paper citation and shares a pre-release draft titled 'Electronic Cash Without a Trusted Third Party' (ecash.pdf).
Adam Back confirms the Hashcash citation and suggests Satoshi look at Wei Dai's b-money proposal. This referral led Satoshi to contact Wei Dai and cite b-money in the Bitcoin whitepaper.