Adam Back

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Adam Back

Adam Back (born July 1970) is a British cryptographer and crypto-hacker. Adam Back is a British cryptographer and crypto-hacker notable as the inventor of Hashcash, the proof-of-work system used by Bitcoin.


He is the inventor of hashcash, the proof-of-work system used by several anti-spam systems. A similar system is used in bitcoin.[1] Hashcash has also been used in a number of other protocols such as combating blog spam, and defending against user namespace pollution.

He implemented credlib, a library that implements the credential systems of Stefan Brands and David Chaum. He was the first to formalize the Non-Interactive Forward-Secrecy[2] security property for email and to observe that any Identity Based Encryption scheme can be used to provide Non-Interactive Forward Secrecy. He is also known for pioneering the use of ultra-compact code with his 3-line RSA in Perl[3] signature file and non-exportable T-shirts to protest the United States cryptography export regulations. Today he is CEO of Blockstream, a company that seeks to further the development of bitcoin and blockchain technology.

One of the main developments of Adam, through which he received universal recognition of the crypto community, was Hashcash. It is this technology, with some changes, formed the basis of bitcoin. At the moment Adam is focused on working within the project Block stream, which aims to expand peer-to-peer security bitcoin to other assets.

"It is a great honor for me to take the position of CEO at this important moment for the company and help Block stream realize its full potential. We have a team of the highest level, which is fully committed to the idea of building the Foundation on which the transformation of Finance will be based for many years to come.[4]"

It is the greatest mind of the blockchain industry. Defends the position of privacy information of users. He has a Computer Science PhD from University of Exeter.

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