Article | REF: H5538 V2

Cryptocurrencies and blockchains - How to create trust

Author: Jean-Paul DELAHAYE

Publication date: December 10, 2020, Review date: December 9, 2020

You do not have access to this resource.
Click here to request your free trial access!

Already subscribed? Log in!


Français

4. Proof of work

Let's take a look at the competition that takes place every 10 minutes between the main nodes to be designated the winner of 6.25 bitcoins.

A cryptographic hash function is a function h which, to any sequence of symbols S (e.g. numbers and letters), associates another (shorter) sequence of symbols h(S) = R, and above all, which is such that it is impossible in practice for any possible value R of the function h to find an S such that h(S) = R (practical impossibility of inversion). The value R is called the "hash" of file S, or the "fingerprint" of file S. If h is a good hash function, the h(S) values produced by someone trying various values for S are as unpredictable as if they were drawn at random with a lottery wheel. What's more, changing a single symbol of S produces a result that bears no apparent relation to the result before the change. The function used...

You do not have access to this resource.

Exclusive to subscribers. 97% yet to be discovered!

You do not have access to this resource.
Click here to request your free trial access!

Already subscribed? Log in!


The Ultimate Scientific and Technical Reference

A Comprehensive Knowledge Base, with over 1,200 authors and 100 scientific advisors
+ More than 10,000 articles and 1,000 how-to sheets, over 800 new or updated articles every year
From design to prototyping, right through to industrialization, the reference for securing the development of your industrial projects

This article is included in

Software technologies and System architectures

This offer includes:

Knowledge Base

Updated and enriched with articles validated by our scientific committees

Services

A set of exclusive tools to complement the resources

Practical Path

Operational and didactic, to guarantee the acquisition of transversal skills

Doc & Quiz

Interactive articles with quizzes, for constructive reading

Subscribe now!

Ongoing reading
Proof of work