We need a way for the payee to know that the previous owners did not sign any earlier transactions. For our purposes, the earliest transaction is the one that counts, so we don't care about later attempts to double-spend. The only way to co…[6] A. Back, "Hashcash - a denial of service counter-measure," http://www.hashcash.org/papers/hashcash.pdf, 2002.
[7] R.C. Merkle, "Protocols for public key cryptosystems," In Proc. 1980 Symposium on Security and Privacy, IEEE Computer Soc…
Adam Back
computer scientist · 2 mentions across 1 reading
In this course
Adam Back is a cryptographer best known for developing Hashcash, a proof-of-work system that predates Bitcoin and solves the computational puzzle problem central to preventing double-spending in distributed ledgers. In the course readings, Back's work is cited as foundational to the cryptographic mechanisms that enable trustless consensus in blockchain systems, positioning his ideas as a critical bridge between traditional cryptographic protocols and contemporary AI infrastructure that increasingly relies on decentralized validation. His contribution represents a crucial moment where computational difficulty becomes a substitute for institutional trust, a pattern that recurs throughout discussions of algorithmic governance and machine learning systems.
Mentioned in 1 reading
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