This document provides a general introduction to Bitcoin. It begins with an outline and background on the speaker. It then discusses the history of Bitcoin and how it was created to solve the problem of double spending without a trusted third party. Technically, Bitcoin uses asymmetric cryptography, transactions between addresses recorded on a distributed blockchain, and mining to validate transactions through proof of work. Economically, it functions as a currency with a limited and predictable supply governed by math.
Introduction of Bitcoin, explain for newbie and financial person, easy to understanding.
Language
English 99%
Thai 1% (only "Bitcoin in Thailand)
Agenda
- What is Bitcoin
- Bitcoin and Gold, The human economy evolved
- The Bitcoin bubble
- How to can get Bitcoins
- What is Bitcoin Mining
- Total Bitcoins in circulation
- Bitcoin Supply
- How long does it take to mine a single Bitcoin
- Bitcoin consumption power
- B-Commerce
- Silk Road Case
- Tulip Mania 2.0?
- Bitcoin in Thailand
- Reference
Introductory lesson for the Bitcoin and Blockchain Technology course of Milano Bicocca University (2017)
Video (in Italian) available at https://goo.gl/tbB4Pu
this PPT has the answer to the following question:
1)How Did It Start?
2)Where Do Bitcoins Come From?
3)What is the Vision of Bitcoins?
4)What is the Value of a Bitcoin?
5)Who Sells Bitcoins?
6)how to Buy Bitcoins Locally?
7)Why Would You Want Some
Bitcoin?
This presentation provide the brief knowledge of Bitcoin. Bitcoin is a cryptocurrency and a payment system invented by an unidentified programmer, or group of programmers, under the name of Satoshi Nakamoto. Bitcoin was introduced on 31 October 2008 to a cryptography mailing list and released as open-source software in 2009. There have been various claims and speculation concerning the identity of Nakamoto, none of which are confirmed. The system is peer-to-peer and transactions take place between users directly, without an intermediary. These transactions are verified by network nodes and recorded in a public distributed ledger called the blockchain. Which uses bitcoin as its unit of account. Since the system works without a central repository or single administrator, the U.S. Treasury categorizes bitcoin as a decentralized virtual currency.
Introduction of Bitcoin, explain for newbie and financial person, easy to understanding.
Language
English 99%
Thai 1% (only "Bitcoin in Thailand)
Agenda
- What is Bitcoin
- Bitcoin and Gold, The human economy evolved
- The Bitcoin bubble
- How to can get Bitcoins
- What is Bitcoin Mining
- Total Bitcoins in circulation
- Bitcoin Supply
- How long does it take to mine a single Bitcoin
- Bitcoin consumption power
- B-Commerce
- Silk Road Case
- Tulip Mania 2.0?
- Bitcoin in Thailand
- Reference
Introductory lesson for the Bitcoin and Blockchain Technology course of Milano Bicocca University (2017)
Video (in Italian) available at https://goo.gl/tbB4Pu
this PPT has the answer to the following question:
1)How Did It Start?
2)Where Do Bitcoins Come From?
3)What is the Vision of Bitcoins?
4)What is the Value of a Bitcoin?
5)Who Sells Bitcoins?
6)how to Buy Bitcoins Locally?
7)Why Would You Want Some
Bitcoin?
This presentation provide the brief knowledge of Bitcoin. Bitcoin is a cryptocurrency and a payment system invented by an unidentified programmer, or group of programmers, under the name of Satoshi Nakamoto. Bitcoin was introduced on 31 October 2008 to a cryptography mailing list and released as open-source software in 2009. There have been various claims and speculation concerning the identity of Nakamoto, none of which are confirmed. The system is peer-to-peer and transactions take place between users directly, without an intermediary. These transactions are verified by network nodes and recorded in a public distributed ledger called the blockchain. Which uses bitcoin as its unit of account. Since the system works without a central repository or single administrator, the U.S. Treasury categorizes bitcoin as a decentralized virtual currency.
The almost complete guide explaining Bitcoin, philosophy, history, technology, use, the good/bad, how to buy, trading, and its future.
Thanks a lot for a cup of coffee.... =)
Bitcoin : 1ChyUCv7Qqz5fqfb4QhUsYYGmeMfz99vr7
Bitcoin Cash : 18AH4EyLo7djvfKHuRxjVh1cWPJH93ppAx
Ethereum : 0x449fFDBBcD2328662B67Ba3103ce83834d140bf7
Litecoin: 32XW2vssbd2V2tY1MbsRdRoz4UAUw2G4j6
Dogecoin : A8zoTQk9RauhRDbvEQF1bhB5h7dFtVnveX
Preferred Crypto Exchange : Binance
https://www.binance.com/?ref=10955776
Thank you.
Via Capgemini Consulting @CapgeminiConsul
BITCOIN
A Primer for Policymakers
BY JERRY BRITO AND ANDREA CASTILLO
Mercatus Center
George Mason University
3351 Fairfax Drive, 4th Floor
Arlington, VA 22201-4433
(703) 993-4930
mercatus.org
Bitcoin is the world’s first completely decentralized digital
currency.
bitcoin
cryptocurrency
There are two main ways the block chain ledger can be corrupted to steal
bitcoins: by fraudulently adding to or modifying it. The bitcoin system protects
the blockchain against both using a combination of digital
signatures and cryptographic hashes.
hashsalim@gmail.com
This article contains information about history of Bitcoin cryptocurrency. What is Bitcoin? Whom was it created by? This article resumes the whole history of Bitcoin since 2008 to 2018.
Bit Coins are one most disruptive technologies in recent times with an impact that may ultimately be as big as the internet. Bitcoin uses peer-to-peer technology to operate with no central authority or banks. Managing transactions and the issuing of bitcoins is carried out collectively within a network. Bitcoin is open-source; its design is public, nobody owns or controls Bitcoin and anyone can take part. Through many of its unique properties, Bitcoin allows exciting uses that could not be covered by any previous payment system. Bitcoin is a virtual currency and the Bitcoin user experience will be very important for widespread adoption and use. In my talk I am going to talk about the evolution of currency, crypto currencies and Bit Coins. I will also discuss Bitcoin experiences and the Bitcoin platform eco-system, Bit Coin facts, and the possible future of Bit Coins.
Here is the Bitcoin Report. The report involves every aspect of Bitcoin that one need to understand Bitcoin from scratch. Following are the contents that are being covered by the report:-
· Abstract
· Introduction
· History and its Creation
· Working of Bitcoin
· Advantages
· Disadvantages
· Challenges to Bitcoin
· Scope of Bitcoin
· Conclusion
Hope this will help
Sunstone Capital, Avalanche 2014 - Bitcoin: Primer, State of Play, DiscussionYacine Ghalim
Every winter, Sunstone hosts an offsite event with the participation of executives from our portfolio companies, fellow VCs, and various thought leaders.
The event is designed to mix informal networking, stimulating discussions around key topics shaping our industry, and intense skiing. We find that the best inspiration and ideas are generated when you least expect it, and in company with people that challenge your thinking.
This year's edition took us to Courmayeur in the Italian Alps, and Bitcoin was on the list of topics we discussed. Here are the supporting slides from our Jan 24th presentation "Bitcoin: Primer, State of Play, Discussion".
http://www.sunstone.eu
Introduction to Bitcoin, prepared by Bitcoin Manchester to initially be presented at the Manchester Free Software Festival in February 2014.
Contents:
* What is money?
* What is good money?
* How does fiat money work?
* What is Bitcoin?
* How does Bitcoin work?
* Why is Bitcoin important?
An Introduction to BitCoin and Cryptocurrency EcosystemJalal Rohani
A very short introduction to BitCoin and cryptocurrency market capital. Also you can can see a brief introduction to one of the new business made over the concept, CoinBase.
The almost complete guide explaining Bitcoin, philosophy, history, technology, use, the good/bad, how to buy, trading, and its future.
Thanks a lot for a cup of coffee.... =)
Bitcoin : 1ChyUCv7Qqz5fqfb4QhUsYYGmeMfz99vr7
Bitcoin Cash : 18AH4EyLo7djvfKHuRxjVh1cWPJH93ppAx
Ethereum : 0x449fFDBBcD2328662B67Ba3103ce83834d140bf7
Litecoin: 32XW2vssbd2V2tY1MbsRdRoz4UAUw2G4j6
Dogecoin : A8zoTQk9RauhRDbvEQF1bhB5h7dFtVnveX
Preferred Crypto Exchange : Binance
https://www.binance.com/?ref=10955776
Thank you.
Via Capgemini Consulting @CapgeminiConsul
BITCOIN
A Primer for Policymakers
BY JERRY BRITO AND ANDREA CASTILLO
Mercatus Center
George Mason University
3351 Fairfax Drive, 4th Floor
Arlington, VA 22201-4433
(703) 993-4930
mercatus.org
Bitcoin is the world’s first completely decentralized digital
currency.
bitcoin
cryptocurrency
There are two main ways the block chain ledger can be corrupted to steal
bitcoins: by fraudulently adding to or modifying it. The bitcoin system protects
the blockchain against both using a combination of digital
signatures and cryptographic hashes.
hashsalim@gmail.com
This article contains information about history of Bitcoin cryptocurrency. What is Bitcoin? Whom was it created by? This article resumes the whole history of Bitcoin since 2008 to 2018.
Bit Coins are one most disruptive technologies in recent times with an impact that may ultimately be as big as the internet. Bitcoin uses peer-to-peer technology to operate with no central authority or banks. Managing transactions and the issuing of bitcoins is carried out collectively within a network. Bitcoin is open-source; its design is public, nobody owns or controls Bitcoin and anyone can take part. Through many of its unique properties, Bitcoin allows exciting uses that could not be covered by any previous payment system. Bitcoin is a virtual currency and the Bitcoin user experience will be very important for widespread adoption and use. In my talk I am going to talk about the evolution of currency, crypto currencies and Bit Coins. I will also discuss Bitcoin experiences and the Bitcoin platform eco-system, Bit Coin facts, and the possible future of Bit Coins.
Here is the Bitcoin Report. The report involves every aspect of Bitcoin that one need to understand Bitcoin from scratch. Following are the contents that are being covered by the report:-
· Abstract
· Introduction
· History and its Creation
· Working of Bitcoin
· Advantages
· Disadvantages
· Challenges to Bitcoin
· Scope of Bitcoin
· Conclusion
Hope this will help
Sunstone Capital, Avalanche 2014 - Bitcoin: Primer, State of Play, DiscussionYacine Ghalim
Every winter, Sunstone hosts an offsite event with the participation of executives from our portfolio companies, fellow VCs, and various thought leaders.
The event is designed to mix informal networking, stimulating discussions around key topics shaping our industry, and intense skiing. We find that the best inspiration and ideas are generated when you least expect it, and in company with people that challenge your thinking.
This year's edition took us to Courmayeur in the Italian Alps, and Bitcoin was on the list of topics we discussed. Here are the supporting slides from our Jan 24th presentation "Bitcoin: Primer, State of Play, Discussion".
http://www.sunstone.eu
Introduction to Bitcoin, prepared by Bitcoin Manchester to initially be presented at the Manchester Free Software Festival in February 2014.
Contents:
* What is money?
* What is good money?
* How does fiat money work?
* What is Bitcoin?
* How does Bitcoin work?
* Why is Bitcoin important?
An Introduction to BitCoin and Cryptocurrency EcosystemJalal Rohani
A very short introduction to BitCoin and cryptocurrency market capital. Also you can can see a brief introduction to one of the new business made over the concept, CoinBase.
La cartographie brevet est pour l'entreprise un stimulateur de créativité, un outil de veille technologique, une source de renseignements sur sa concurrence et ses partenaires : un atout informationnel pour son business et son positionnement.
Une conférence organisée par l'Interface Entreprises-Université de Liège, le 27 mars 2015. Invité : PICARRE
Introduction to Bitcoin & Blockchain - Societing Summer School 2015Raffaele Mauro
Introduction to Bitcoin & Blockchain
Societing Summer School - August 2015 @ Ruralhub
http://www.ruralhub.it/event/societing-summer-school-2015/
http://www.progetto-rena.it/blockchain-smartrurality-rural-socinn/
A introduction to Bitcoin for ecommerce merchants, held at Magento North East in Newcastle upon Tyne, September 2016.
The talk was given by Richard Carter, senior Magento consultant at ecommerce agency Peacock Carter Ltd.
There is an accompanying blog post on Bitcoin on the Peacock Carter blog at: http://www.peacockcarter.com/blog/bitcoin-ecommerce-guide-merchants/
Introduction to Bitcoin & Blockchain @ darefest16Sam Wouters
A brief introduction on what Bitcoin and the blockchain really are, why they exist, how they work and what we can do with them.
Interested in learning more? Check out my website or book me as a speaker: http://samwouters.com/
Twitter: https://twitter.com/SDWouters
LinkedIn: https://www.linkedin.com/in/samwouters
Los mexicanos dicen ser felices, que la tecnología digital puede hacer mejor la vida y que los medios online le permiten expresarse con libertad; también concuerdan en que la alimentación y la mente son dos aspectos de la salud que les interesan, así como les preocupa tener una vida más larga. Esto son algunos de los hallazgos del Reporte Prosumers: Vida Moderna en México de Euro RSCG México, que permitirá a las marcas comerciales conocer las tendencias y oportunidades, así como su influencia en los consumidores.
John Mardlin of Coin Forest, and Gareth MacLeod of Tinkercoin's presentation on why Bitcoin is important, and explain the concepts of the proof of work, and block chain technology that make it revolutionary.
Regardless of what happens to Bitcoin Itself, crypto currencies are here to stay, and will have immense and unforeseen impacts in the near future.
How to demystify cross-border payments in traveltnooz
Payment efficiency and security for cross-border payments are essential in today’s global marketplace.
However, there are many gaps in understanding foreign currency and reconciliation issues once payment is made.
During this session we will discuss currency and cross-border strategies for operating in a global travel economy.
Topics include:
Evaluation of currency types
Strategies for pairing currencies
Exotic currencies
Products and technology to simplify payment intricacies
Join these industry experts and Tnooz for our FREE webinar:
Noel Goddard, founder, FTT Global
Kristin Mollison, senior technical product manager, WEX
Kevin May, moderator and editor, Tnooz
Gene Quinn, producer and CEO, Tnooz
This webinar took place on Thursday 29 January 2015.
A visual, and easy to undertsand outline of the Bitcoin Protocol.
In this talk, I explain the 'legend' of Satoshi Nakamoto, and the protocol that he conceived. The specific aspects covered are Wallets, Addresses, Trasactions, The Block Chain, Mining and currency Issuance.
The intention is to help a general audience understand HOW Bitcoin achieves a decentralized peer to peer currency.
Armed with this understanding, groups are better equipped to have a critical discussion about the economic, social and political impacts of this technology.
The outline, and visual presentation seem to be effective for the purpose, so the content belongs to the creative commons. I ask that you credit me for the work, but you are free to copy and revise as you wish.
You can find the original content here (you'll have to copy the file to your own Google Drive in order to edit it):
http://bit.ly/1gyJmx2
A Business Pitch to Create a comprehensive, Filipino-centric
online money remittance, bill payment, savings and financial consulting system that helps Filipino Nationals working
oversees conveniently manage their hard earned money.
Ocean Systems briefly summarizes their highly intuitive FedLink Wire Transfer Core System. The FedLink system is a scalable wire transfer software solution that integrates various modules to automate, simplify, and comply with all compliance and wire transfer related requirements.
Is Poor Scalability Bitcoin’s Next Problem?InvestingTips
This could be a long term problem for Bitcoin when, for years, it was touted as the alternative investment free from such influences. Now there is another issue as Bitcoin returns to economic viability, scalability. Is poor scalability Bitcoin’s next problem and why?
https://youtu.be/GGlNhwOslE4
Bitcoin is a peer-to-peer electronic cash system and the first truly decentralized network for sending and receiving value over the Internet. This presentation gets into the details of the technology and answers common questions related to the bitcoin, how it works.
Overview of bitcoin regulation challenges and opportunities.
The research focused on ineffective controls used by western regulators to control Bitcoin and cryptocurrency .
Kristof V. explained the basics of blockchain and smart contracts. Starting with the mechanics of bitcoin (introduced by the 2009 paper of Satoshi Nakamoto) he explains concepts of pseudonymisation, encryption, blockchain, mining, and distribution. After skimming high-level through some use cases he moves to "(smart) contracts", using the example of an auction.
Link to examples of "smart contracts": https://dapps.ethercasts.com
Link to the event follow-up page: https://www.meetup.com/Brussels-Legal-Hackers/messages/boards/thread/50920056
Legal hackers: https://www.meetup.com/Brussels-Legal-Hackers
Bitcoin is a digital, decentralized, partially anonymous currency, not backed by any government or other legal entity, and not redeemable for gold or other commodity. It relies on peer-to-peer networking and cryptography to maintain its integrity. A purely peer-to-peer version of electronic cash would allow online payments to be sent directly from one party to another without going through a financial institution. Digital signatures provide part of the solution, but the main benefits are lost if a trusted third party is still required to prevent double-spending.
Bitcoin – for some people, this may be something making them excited and sleepless while for some others, it may be the first time they have come across such a term.
BlockChain Tutorial | Getting Started With BlockChain | BlockChain Certificat...Edureka!
This Edureka "Getting started With BlockChain" tutorial will help you in understanding the fundamentals of BitCoin and Blockchain. Below are the topics covered in this tutorial.
1. Issues with Current Banking Systems
2. How Bitcoin solves these issues?
3. Bitcoin Transaction
4. BlockChain to the rescue
5. BlockChain Concepts
6. BlockChain Features
7. BlockChain Use Cases
8. Demo – Banking Use Case
Here is a structured training on BlockChain, check out the details: https://goo.gl/Z9rJgU
Bitcoin is a decentralized electronic cash system using peer-to-peer networking to enable payments between parties without relying on mutual trust. It was first described in a paper by Satoshi Nakamoto (widely presumed to be a pseudonym) in 2008. Payments are made in bitcoins (BTC's), which are digital coins issued and transferred by the Bitcoin network.
Bitcoin Technology” Bitcoin is an innovative technology that offers several benefits, such as fast transaction speeds, low costs, and the elimination of the need for a third-party intermediary to process transactions. Unfortunately, BitCoin has faced resistance from regulators because the technology has been used for nefarious purposes, including online drug purchases and Ponzi schemes. This note provides a basic explanation of how BitCoin works and is currently regulated on federal and state levels. This note argues that BitCoin should not be forced into old regulatory frameworks that do not adequately balance security concerns with the benefits of BitCoin. BitCoin should not be regulated at the federal level. Instead, state regulations should focus on BitCoin providers that can unilaterally transfer or block transfers of BitCoin on behalf of users. State regulators should require such providers to register with their given states, maintain adequate books and records, implement advanced cyber security standards, conduct audits of their operations, and submit reports to state regulators. In crafting these regulations, regulators should keep in mind that vague or poorly drafted regulations will chill innovation. A Bitcoin would allow online payments to be sent directly from one party to another without going through a financial institution. Digital signatures provide part of the solution, but the main benefits are lost if a trusted third party is still required to prevent double-spending. We propose a solution to the double-spending problem using a peer-to-peer network.
Le "Diagnostic Propriété Intellectuelle (PI)" est une méthodologie simple et pragmatique proposée par Picarré. Elle permet aux entreprises d'identifier ses actifs PI et de les exploiter pour renforcer ses avantages concurrentiels par une approche globale et transversale. Le Diagnostic PI aboutit à des constats objectivés et un plan de recommandations, qui permettent de changer de posture en considérant la PI non plus comme une contrainte mais comme un outil de croissance de l'entreprise.
Pour une société innovante ou technologique, les besoins de trésorerie et de développement sont importants. Et il est souvent compliqué d’obtenir des financements dont les montants sont suffisants et les délais compatibles avec les nécessités des projets. Il est pourtant possible de convaincre son banquier à condition de considérer sa demande dans une stratégie globale qui intègre les autres sources de financement.
Le programme européen Eurêka vise la mise au point de nouveaux produits, procédés ou services assez proches du marché, en permettant à des PME et des unités de recherche d'y collaborer. Contrairement à d'autres initiatives européennes, il est plus souple, moins contraignants avec un taux de succès relativement élevé. Le Service Public de Wallonie est le point de contact pour concrétiser l'introduction de ces projets. Et l'Interface Entreprises ULiège, via son intégration dans des réseaux tels qu'EEN, peut aider à identifier des partenaires européens. Ces services sont à la disposition des entreprises innovantes et des chercheurs wallons.
La réforme du code des sociétés qui sera bientôt d’application est une profonde révolution en termes de capitaux, de gouvernance, de responsabilité des fondateurs et dirigeants d’entreprise, … Elle impacte les sociétés existantes tout autant que celles en création et concerne donc les dirigeants, les porteurs de projet et les investisseurs.
L'analyse multicritère proposée par Innovatech est un outil méthodologique constructif qui consiste à dresser une cartographie des facteurs de risques d'un projet d'innovation technologique. Combinant interviews et analyses, il permet de challenger l'entreprise par rapport au projet, de mettre en évidence ses points forts et faibles et d'identifier les mesures correctrices susceptibles de le renforcer. Cette démarche de progrès ouvre donc la réflexion, non seulement pour situer le projet dans son environnement mais également pour amener les améliorations structurelles qui contribueront à appréhender les futurs projets de manière plus professionnelle.
Jongler avec la fiscalité et les incitants du gouvernement, qui visent à favoriser les entreprises innovantes, c’est dégager du cash pour l’affecter directement au développement de son activité. Comprendre la philosophie de la loi permet d'être éveillé aux opportunités qu'elle apporte à l'entreprise. Attention toutefois, que l'on parle de dispense de précompte professionnel scientifique, de déduction d'impôt sur revenus d'innovation ou de Young Innovative Company, il y lieu de n'oublier aucune étape administrative préalable pour en bénéficier pleinement.
Une conférence organisée par l'Interface Entreprises - Université de Liège, le 26 octobre 2018.
Orateur : MoneyOak
Parmi les défis que rencontre une entreprise innovante, les rapports humains, qu'ils soient internes (gestion d'équipe) ou externes (partenariats avec des organisations de cultures différentes), jouent un rôle central et l'implication des partenaires est un des éléments-clés de réussite. Le SISEM (Self Implication Strategy for Ethics in Management) est une approche qui propose de comprendre les complémentarités, plutôt que de se focaliser sur les différences.
Un atelier-conférence organisé par l'Interface Entreprises-Université de Liège, le 30 mars 2018. Orateur : réseau SISEM
Pour soutenir l'activité innovante des entreprises situées sur son territoire, la Région wallonne a mis en œuvre différentes aides à la recherche et à l'innovation technologique qui peuvent être sollicitées pour tout projet de recherche industrielle ou de développement expérimental, visant la mise au point de nouveaux produits, procédés ou services, l'acquisition de nouvelles technologies ou encore le renforcement du potentiel scientifique et technologique.
Une conférence organisée par l'Interface Entreprises - Université de Liège, le 23 février 2018
Orateur : Service Public de Wallonie (SPW - DGO6)
Le Protocole de Nagoya et le Règlement européen 511/2014 qui le transpose régulent depuis octobre 2014 l'accès aux ressources biologiques utilisées comme objets de recherches et pourraient représenter un risque pour une entreprise ou un laboratoire de recherche qui les négligerait dans la gestion administrative et légale de son programme R&D.
Une conférence organisée par l'Interface Entreprises-Université de Liège, le 27 octobre 2017
Orateur : BELSPO
Les actifs immatériels représentent 85% de la valeur d'une entreprise. Les identifier, les évaluer et les valoriser dans une approche systémique, pour convaincre des investisseurs potentiels lors d'une levée de fonds, apporte une réelle plus-value.
Une conférence organisée par l'Interface Entreprises-Université de Liège, le 29 septembre 2017.
Orateur : WIZYOU S.A.
Les activités d'innovation technologique, d'un point de vue fiscal, nécessitent d'adopter une stratégie qui tienne compte des récents changements de la législation. Cette présentation fait un tour d'horizons des principaux incitants fiscaux en matière de R&D, au bénéfice des entreprises, qu'elles soient en phase de développement ou d'expansion.
L'environnement en matière de protection des données à caractère personnel est en pleine mutation et de nouvelles règles seront réalité à partir de mai 2018 (cf. General Data Protection Regulation - EU). Il convient donc de prendre la mesure de ces changements afin que les entreprises soient prêtes pour cette date fatidique.
Une conférence organisée par l'Interface Entreprises-Université de Liège, le 28 avril 2017.
Orateur : CRIDS - UNamur
Les technologies et applications de l'Intelligence Artificielle connaissent une évolution rapide et suscitent curiosité, enthousiasme et espoirs, aussi bien que méfiance, incrédulité ou oppositions. Mais leur utilisation soulève plusieurs interrogations sur le plan juridique, en particulier en matière de droit social, de vie privée, de propriété intellectuelle, de données personnelles, de discrimination et surtout de responsabilité.
Une conférence organisée par l'Interface Entreprises-Université de LIège, le 31 mars 2017.
Orateur : NAUTADUTILH
La réussite d'une négociation de la valeur d'une entreprise technologique face à un futur partenaire dépendra d'une bonne préparation, tant au niveau des données de l'entreprise et du modèle d'évaluation utilisé, que des attentes et de la stratégie des actionnaires. Outils, facteurs clés indispensables et bonnes pratiques sont ici parcourus.
Une conférence organisée par l'Interface Entreprises-Université de Liège, le 24 février 2017.
Orateur : DELOITTE
Cette brochure donne un aperçu non exhaustif des compétences de l’ULg sélectionnées selon les 6
axes du Pôle SKYWIN :
1. MATERIAUX COMPOSITES ET PROCESSUS INDUSTRIELS
2. ALLIAGES METALLIQUES ET PROCESSUS INDUSTRIELS
3. SYSTEMES EMBARQUES
4. SERVICES AEROPORTUAIRES
5. SYSTEMES ET APPLICATIONS A VOCATION SPATIALE ET DRONES
6. MODELISATION ET SIMULATION
Un point d’attention particulier a également été mis sur les compétences liées à l’Industrie 4.0 dont
les membres du Pôle sont en demande constante, notamment pour :
7. GESTION ET TRAITEMENT DES DONNEES (IOT, BIG DATA ANALYSIS, CLOUD COMPUTING, …)
8. ORGANISATION ET GESTION DES RESOURCES HUMAINES (ACCEPTABILITE, TYPES
D’ORGANISATION, …)
9. SIMULATION ET REALITE AUGMENTEE.
L'impression 3D ou Additive Manufacturing s'est imposée dans de nombreux secteurs industriels comme outil de prototypage voire de fabrication. Mais cette nouvelle technologie amène risques et enjeux pour les titulaires de droits intellectuels (e.a. droit des marques) et pour les différents acteurs du marché concernés.
Une conférence organisée par l'Interface Entreprises-Université de Liège, le 27 janvier 2017
Orateurs : SIRRIS, NAUTADUTILH
1. General Introduction to Bitcoin
Jérémie Dubois-Lacoste, PhD
jeremie.dl@gmail.com
Les Geeks Anonymes - Liège - 27/02/2015
2. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Preliminaries
Who am I?
Post-doc researcher in Computer Science
(AI lab of ULB)
Founder & Organizer of “Bitcoin Brussels” meetup group
(250 members)
Founder & Director of ASBL/VZW “Belgian Bitcoin
Association”
Involved in Bitcoin startups
2 / 57
3. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Preliminaries
Disclaimer
I own some bitcoins
Bitcoin should (still) be seen as an experiment
The topic is often hard, because of its paradigm novelty.
Don’t be frustrated if you don’t get 100% :-)
3 / 57
4. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Outline
Outline
Bitcoin in a Nutshell
Technical Overview
Economical Overview
Business Development Overview
Conclusion
4 / 57
5. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Bitcoin in a Nutshell
Outline
Bitcoin in a Nutshell
History
What is Bitcoin?
Technical Overview
Economical Overview
Business Development Overview
Conclusion
5 / 57
6. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Bitcoin in a Nutshell
History
Apparition of Bitcoin
Money based on cryptography: an old cypherpunk ideal
b-money (Wei Dai, 1999)
bitgold (2005, Nick Szabo)
Main issue with these attempts: requires a trusted third-party to
avoid “double-spending”
6 / 57
7. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Bitcoin in a Nutshell
History
The Tour de Force of “Satoshi Nakamoto”
Scientific Article (November 2008) :
Complete description of the concept
Introduce the idea of the blockchain
Implementation (January 2009)
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8. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Bitcoin in a Nutshell
What is Bitcoin?
Outline
Bitcoin in a Nutshell
History
What is Bitcoin?
Technical Overview
Economical Overview
Business Development Overview
Conclusion
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9. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Bitcoin in a Nutshell
What is Bitcoin?
What is Bitcoin? (1/3)
Formal Answer
Bitcoin: Information exchange protocol (like http, smtp...),
that allows the transfer of units of account; these units
behave like the money we are used to.
Durability
Portability
Fungibility
Divisibility
Relative rarety
bitcoin(s): name of the unit of account circulating on the
Bitcoin network
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10. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Bitcoin in a Nutshell
What is Bitcoin?
What is Bitcoin? (2/3)
Informal Answer - Micro Scale
A system for people to send and receive payments
Without depending on any third-party
Reasonably privately
Instantly
Reliably
Typical transaction fee today: zero or 0.03C
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11. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Bitcoin in a Nutshell
What is Bitcoin?
What is Bitcoin? (3/3)
Informal Answer - Macro Scale
Money supply policy governed by maths; known in
advance
Without border
Distributed
Open source software; community developed
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12. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Bitcoin in a Nutshell
What is Bitcoin?
What is the core innovation of Bitcoin?
In the “usual” world
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13. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Bitcoin in a Nutshell
What is Bitcoin?
What is the core innovation of Bitcoin?
In the “usual” world
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14. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Bitcoin in a Nutshell
What is Bitcoin?
What is the core innovation of Bitcoin?
In the “usual” world
Trusted third parties are “keeping the books”
Centralized consensus
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15. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Bitcoin in a Nutshell
What is Bitcoin?
What is the core innovation of Bitcoin?
In Bitcoin world
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16. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Bitcoin in a Nutshell
What is Bitcoin?
What is the core innovation of Bitcoin?
In Bitcoin world
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17. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Bitcoin in a Nutshell
What is Bitcoin?
What is the core innovation of Bitcoin?
In Bitcoin world
No trusted parties, “keeping the books” is done collectively
without trust
Decentralized consensus
The mechanism to allow that is called the blockchain
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18. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Bitcoin in a Nutshell
What is Bitcoin?
What is the core innovation of Bitcoin?
In Bitcoin world
Remark: Bitcoin use decentralized consensus
to determine ownership.
Much more can be done (outside the scope of this talk...)
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19. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
Outline
Bitcoin in a Nutshell
Technical Overview
Addresses and keys
Transactions
The Blockchain
Bitcoin Mining: Blocks
Economical Overview
Business Development Overview
Conclusion
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20. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
Addresses and keys
Addresses and keys
Assymetric cryptography (public/private key pair)
Bitcoins exchanged between addresses:
1JwSSubhmg6iPtRjtyqhUYYH7bZg3Lfy1T
Everybody can see the amount associated to an address
Only owners of corresponding private key can spend them
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21. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
Addresses and keys
Private keys can be stored...
On a computer
On a USB stick, a DVD-Rom
Printed or written on paper
Only in your memory: “brain-wallet”
On a specific device
In poetry
etc.
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22. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
Transactions
Outline
Bitcoin in a Nutshell
Technical Overview
Addresses and keys
Transactions
The Blockchain
Bitcoin Mining: Blocks
Economical Overview
Business Development Overview
Conclusion
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23. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
Transactions
Transactions
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24. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
Transactions
Paul received 3 BTC via 2 transactions
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25. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
Transactions
Paul wants to send 3 BTC to Jacques
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26. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
Transactions
Paul wants to send 3 BTC to Jacques
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27. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
Transactions
Once the transaction is confirmed
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28. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
Transactions
How to do this without trusted third-party?
How does Jacques know that Paul really had 3 BTC
available?
How to avoid that Paul spends them again?
→ Blockchain
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29. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
The Blockchain
Outline
Bitcoin in a Nutshell
Technical Overview
Addresses and keys
Transactions
The Blockchain
Bitcoin Mining: Blocks
Economical Overview
Business Development Overview
Conclusion
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30. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
The Blockchain
Blockchain
Contains all transactions and distributed on every node
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31. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
The Blockchain
Secured by Mining
The miners “clear” transactions and secure the blockchain
by recording them in blocks
In exchange, they are rewarded with new bitcoins created
ex-nihilo (at a fix rate)
Emerging behavior: the system as a whole acts honestly
as long as a large enough majority acts honestly
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32. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
Bitcoin Mining: Blocks
Outline
Bitcoin in a Nutshell
Technical Overview
Addresses and keys
Transactions
The Blockchain
Bitcoin Mining: Blocks
Economical Overview
Business Development Overview
Conclusion
27 / 57
33. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
Bitcoin Mining: Blocks
Hashing Algorithms
Hashing Algorithms take inputs of any size, and produce
outputs (hash) of standard sizes:
“haha” -> bcb4fe6563d225fbc7b0e90571fc670f1ee197f18ba18e52a39c2ca80672812f
“hello world” -> a948904f2f0f479b8f8197694b30184b0d2ed1c1cd2a1ec0fb85d299a192a447
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34. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
Bitcoin Mining: Blocks
Hashing Algorithms: SHA256
SHA256 State-of-the-art hashing algorithm, used for many
applications in the world, and also for bitcoin mining.
Public, many open source implementations, can be
downloaded or implemented yourself.
Typically installed on every computer.
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35. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
Bitcoin Mining: Blocks
Hashing Algorithms: SHA256
SHA256 State-of-the-art hashing algorithm, used for many
applications in the world, and also for bitcoin mining.
Public, many open source implementations, can be
downloaded or implemented yourself.
Typically installed on every computer.
Let’s play with it!
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36. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
Bitcoin Mining: Blocks
Quite chaotic
Example!
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37. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
Bitcoin Mining: Blocks
Not Reversible: Brute force!
Find the English word that produces the hash:
3dc3ae00e6d09d5e491895aca9237b14a87deabad03bfb9f5679eb49ff8b9744
Example!
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38. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
Bitcoin Mining: Blocks
Not Reversible: Brute force!
Find the English word that produces the hash:
3dc3ae00e6d09d5e491895aca9237b14a87deabad03bfb9f5679eb49ff8b9744
Example!
Must try all words in English dictionary until you try with
“zebra”
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39. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
Bitcoin Mining: Blocks
Link with bitcoin mining
Bitcoin mining is nothing else than “brute force” as we just
did.
But the goal in bitcoin mining is not to find input with
specific hash (that would be too hard).
The goal is to find input with a hash that starts with enough
’0’ at the beginning:
0000000006d09d5e491895aca9237b14a87482b6d03bfb9f5679eb49ff8b9744 -> OK
adc3ae4af8ec45b812ac2e5f6b4c5d79114d4741av1895aca9237b14a87dea78 -> not OK
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40. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
Bitcoin Mining: Blocks
Let’s be a Minner!
Our goal is to find a hash starting with one ’0’.
Our input are the recent transactions that happened on the
bitcoin network. Here we simplify all these data to the
string of characters “block-data”:
Example!
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41. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
Bitcoin Mining: Blocks
Let’s be a Minner!
Our goal is to find a hash starting with one ’0’.
Our input are the recent transactions that happened on the
bitcoin network. Here we simplify all these data to the
string of characters “block-data”:
Example!
Hash NOT OK
We can include an arbitrary number (“nonce”) to obtain
more hashes for our data.
So we “mine” (brute force) this:
“block-data free-number=<we_can_choose>”
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42. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
Bitcoin Mining: Blocks
Let’s be a Minner: Success!
We found a hash OK, we can confirm the block and tell
everyone. They check themselves that indeed the hash is
OK
We earned 25 BTC
Bitcoin mining is nothing more complex than that
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43. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
Bitcoin Mining: Blocks
Real Bitcoin Mining: same thing but (much) harder
In reality, the (current) goal is to find hashes starting with
17 ’0’ in a row.
We did 4 trials in few seconds to mine a block starting with
one ’0’.
Miners together are doing 350 thousands of billions of
trials per second (350 Peta hashes / s) to find hashes
starting with 17 ’0’.
The difficulty adapts automatically to the network hash
rate, to keep one block confirmation every 10mn
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44. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
Bitcoin Mining: Blocks
Bitcoin total mining power
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45. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
Bitcoin Mining: Blocks
Blockchain = sequence of blocks
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46. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Technical Overview
Bitcoin Mining: Blocks
Blockchain = distributed consensus
The blockchain is a database that everybody can freely
read...
But it is hard to expand...
And excessively hard to “rewrite”
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47. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Economical Overview
Outline
Bitcoin in a Nutshell
Technical Overview
Economical Overview
Money Supply
Number of base units
Price
Business Development Overview
Conclusion
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48. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Economical Overview
Money Supply
Money supply of Bitcoin
Central bank, state-backed currency:
Monetary policy decided/updated regularly
Bitcoin:
Fixed since the very beginning, known in the future forever
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49. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Economical Overview
Money Supply
Money supply of Bitcoin
Inspired from gold mining
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50. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Economical Overview
Number of base units
Number of units
21 Millions of BTC will exist maximum, ever
Divisible up to 8 decimals (for now...)
In fact, this number has very little economic relevance!
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51. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Economical Overview
Price
Price
The bitcoin system itself does not include any price setting
mechanism
Like any scarce resource, supply and demand determine
price wrt. things outside of the system.
Price discovery happens only at the boundaries of the
system where it meets another one (think forex)
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52. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Business Development Overview
Outline
Bitcoin in a Nutshell
Technical Overview
Economical Overview
Business Development Overview
Example of Potential Market Disruption
Investments in Bitcoin Ecosystem
Conclusion
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53. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Business Development Overview
Example of Potential Market Disruption
Remittance Market
Significant part of GDP in many countries
414bn$ sent to developing countries in 2013 (x4 amount of
2000!)
Source: World Bank
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54. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Business Development Overview
Example of Potential Market Disruption
The case of Africa
In Africa, the amount sent back by migrants is 3 times
amount of aid from developed countries
On average, an African migrant sending 200$ home will
pay 25$ (12%)
Source: World Bank
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55. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Business Development Overview
Example of Potential Market Disruption
Fees Africa <-> Africa
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56. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Business Development Overview
Example of Potential Market Disruption
Fees overall
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57. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Business Development Overview
Example of Potential Market Disruption
What when they will use Bitcoin?
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58. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Business Development Overview
Investments in Bitcoin Ecosystem
Outline
Bitcoin in a Nutshell
Technical Overview
Economical Overview
Business Development Overview
Example of Potential Market Disruption
Investments in Bitcoin Ecosystem
Conclusion
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59. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Business Development Overview
Investments in Bitcoin Ecosystem
Venture Capital Investment in Bitcoin (1/3)
Source: coindesk.com
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60. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Business Development Overview
Investments in Bitcoin Ecosystem
Venture Capital Investment in Bitcoin (2/3)
Source: coindesk.com
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61. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Business Development Overview
Investments in Bitcoin Ecosystem
Venture Capital Investment in Bitcoin (3/3)
Similarly to Internet historical development, US dominates...
Source: coindesk.com
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62. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Conclusion
Outline
Bitcoin in a Nutshell
Technical Overview
Economical Overview
Business Development Overview
Conclusion
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63. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Conclusion
More info (online)
http://www.blockchain.info
http://www.bitcoin.org
https://en.bitcoin.it/wiki/
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64. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Conclusion
More info (in real life)
http://www.bitcoinassociation.be
http://www.meetup.com/Bitcoin-Brussels
jeremie.dl@gmail.com
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65. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Conclusion
The first five times you think you understand bitcoin, you don’t – Dan Kaminski
I’m a big fan of Bitcoin, regulation of money supply needs to be depoliticized – Al Gore
There are 3 eras of currency: commodity based, politically based, and now, math
based – Chris Dixon
We have elected to put our money and faith in a mathematical framework that is free of
politics and human error – Tyler Winklevoss
Bitcoin is a technological tour de force – Bill Gates
This may be the purest form of democracy the world has ever known, and for one I am
thrilled to be here to watch it unfold – Paco Ahlgren
It will be everywhere, and the world will have to readjust. World governments will have
to readjust – John McAfee
Bitcoin will do to banks what email did to the postal industry – Rick Falkvinge
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66. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Additional
Asymmetric Cryptography and Bitcoin Transactions
(A)symmetric Cryptography?
Before talking about asymmetric cryptography, what is
symmetric one:
Symmetric cryptography is simply encoding something
with a secret password that is required to decode it later.
In other words, it is just the “good old way” to encrypt and
decrypt messages.
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67. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Additional
Asymmetric Cryptography and Bitcoin Transactions
Asymmetric Cryptography
What’s different in Asymmetric cryptography:
Term “asymmetric”: there are two “keys” instead of a single
“secret password”.
One key is called “public” and can be shared with
everyone, one key is “private” and is kept by user.
Keys are just large numbers:
6589841676498741318947564149846542118715985245454020989874567891618907498
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68. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Additional
Asymmetric Cryptography and Bitcoin Transactions
Asymmetric Cryptography
What’s different in Asymmetric cryptography:
Term “asymmetric”: there are two “keys” instead of a single
“secret password”.
One key is called “public” and can be shared with
everyone, one key is “private” and is kept by user.
Keys are just large numbers:
6589841676498741318947564149846542118715985245454020989874567891618907498
Let’s use graphics instead to explain the concept
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69. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Additional
Asymmetric Cryptography and Bitcoin Transactions
Asymmetric Cryptography explained with Graphics
This is an asymmetric-crypto lock
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70. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Additional
Asymmetric Cryptography and Bitcoin Transactions
Asymmetric Cryptography explained with Graphics
These are Filip and Chris
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71. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Additional
Asymmetric Cryptography and Bitcoin Transactions
Asymmetric Cryptography explained with Graphics
This is Filip’s public key, everybody has it (Chris too)
Turn only clock-wise
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72. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Additional
Asymmetric Cryptography and Bitcoin Transactions
Asymmetric Cryptography explained with Graphics
This is Filip’s private key, only him has it
Turn only counter clock-wise
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73. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Additional
Asymmetric Cryptography and Bitcoin Transactions
Asymmetric Cryptography explained with Graphics
What fun stuff can we do with this lock and these two keys?
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74. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Additional
Asymmetric Cryptography and Bitcoin Transactions
Fun Stuff #1
(Not directly related to Bitcoin)
1. Chris puts a message in the box
2. He closes the lock using the public key of Filip.
3. Only the private key can now open the box.
→ Chris can send 100% private messages to Filip!
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75. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Additional
Asymmetric Cryptography and Bitcoin Transactions
Fun Stuff #2
(Directly related to Bitcoin, time to wake up!)
1. Filip puts his message in the box
2. Filip closes the lock using its private key.
3. Chris open the box with Filip’s public key and knows that
only the private key of Filip could have closed the box on
the “left” position!
→ Filip can send messages to Chris, and prove he his the
writer: called digital-signature.
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76. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Additional
Asymmetric Cryptography and Bitcoin Transactions
Fun Stuff #2 and Bitcoin
Instead of a message to Chris only, Filip writes to
everybody (leaving many boxes in public places).
Everybody can check he his actually the writer of the
message.
His message is for instance:
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77. A General Introduction to Bitcoin Jérémie Dubois–Lacoste jeremie.dl@gmail.com
Additional
Asymmetric Cryptography and Bitcoin Transactions
Fun Stuff #2 and Bitcoin
We just did a bitcoin transaction! :-)
In the Bitcoin system, a public key is a bitcoin address to
receive money.
The corresponding private key is used to “spend” the coins
from that address and send them to somebody else.
Everybody can send coins to Filip just knowing his address
Only Filip can send coins associated with his address to
somebody else (spend them). People know that it is really
Filip who decides to spend them.
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