Hashcash is a proof-of-work system used to limit email spam and denial-of-service attacks. Hashcash was proposed in 1997 by Adam Back and described more...

environmentalists for their energy consumption. One popular system, used in Hashcash, uses partial hash inversions to prove that computation was done, as a...

He is the CEO of Blockstream, which he co-founded in 2014. He invented Hashcash, which is used in the Bitcoin mining process. Back was born in London,...

Reusable Proofs of Work proposal, which itself was based on Adam Back's 1997 Hashcash proposal. Bitcoin, released in 2009, was the first widespread implementation...

the service provider. One popular system – used in Bitcoin mining and Hashcash – uses partial hash inversions to prove that work was done, to unlock a...

The concept was independently rediscovered by Adam Back who developed Hashcash, a proof-of-work scheme for spam control in 1997. The first proposals for...

may look similar to hashcash, except that the receiver side verification is a negligible amount of work, while a typical hashcash algorithm would require...

Nakamoto in 2008. Nakamoto improved the design in an important way using a Hashcash-like method to timestamp blocks without requiring them to be signed by...

functions Comparison of cryptography libraries Hash function security summary Hashcash HMAC International Association for Cryptologic Research (IACR) Trusted...

a proof-of-work algorithm (more precisely, as the hash function in the Hashcash proof-of-work algorithm). It was first implemented for Tenebrix (released...