Advantages and disadvantages of permissionless blockchainBlockchain Council
Blockchain Technology surfaced with the surge of cryptocurrency. Today you may find every business, and all the big industries are talking about using Blockchain. They want to make it a part of their mainstream business operations. On the surface, we know that blockchain is a distributed ledger technology. It works on the principle of decentralisation and peer-to-peer transactions. It means that Blockchain culminates the need of having intermediaries. Thus it saves cost and time both. It is the prime reason that many of the financial institutions and businesses are trying to use Blockchain for their benefit.Check out the full article here >>
https://bit.ly/2zRdAyS
***** Blockchain Training : https://www.edureka.co/blockchain-training *****
This Edureka video on "Blockchain Explained" is to guide you through the fundamentals of the new revolutionary technology called Blockchain and its defining concepts. Below are the topics covered in this tutorial:
1. History of blockchain
2. What is Blockchain
3. Traditional Transaction vs Blockchain
4. How Blockchain Works
5. Benefits of Blockchain
6. Blockchain Transaction Demo
Here is the link to the Blockchain blog series: https://goo.gl/DPoAHR
You can also refer this playlist on Blockchain: https://goo.gl/V5iayd
Advantages and disadvantages of permissionless blockchainBlockchain Council
Blockchain Technology surfaced with the surge of cryptocurrency. Today you may find every business, and all the big industries are talking about using Blockchain. They want to make it a part of their mainstream business operations. On the surface, we know that blockchain is a distributed ledger technology. It works on the principle of decentralisation and peer-to-peer transactions. It means that Blockchain culminates the need of having intermediaries. Thus it saves cost and time both. It is the prime reason that many of the financial institutions and businesses are trying to use Blockchain for their benefit.Check out the full article here >>
https://bit.ly/2zRdAyS
***** Blockchain Training : https://www.edureka.co/blockchain-training *****
This Edureka video on "Blockchain Explained" is to guide you through the fundamentals of the new revolutionary technology called Blockchain and its defining concepts. Below are the topics covered in this tutorial:
1. History of blockchain
2. What is Blockchain
3. Traditional Transaction vs Blockchain
4. How Blockchain Works
5. Benefits of Blockchain
6. Blockchain Transaction Demo
Here is the link to the Blockchain blog series: https://goo.gl/DPoAHR
You can also refer this playlist on Blockchain: https://goo.gl/V5iayd
Global trade of goods has been growing at double-digit rates since the early 2000s. Digitzation had its time; but still we have manual paper based work exsisitng in most of the Trade finance activities. Now is the time to see value addition from Blockchain based platforms and how they can make this process faster, reliable and paperless.
La technologie blockchain peut-elle s’insérer dans l’écosystème IoT pour adresser les problèmes de confiance, d’identité et de protection des données ?
Ce talk est une introduction à blockchain avec un focus sur son impact sur l’IoT.
The Blockchain - The Technology behind Bitcoin Jérôme Kehrli
The blockchain and blockchain related topics are becoming increasingly discussed and studied nowadays. There is not one single day where I don't hear about it, that being on linkedin or elsewhere.
I interested myself deeply in the blockchain topic recently and this is the first article of a coming whole serie around the blockchain.
This presentation is an introduction to the blockchain, presents what it is in the light of its initial deployment in the Bitcoin project as well as all technical details and architecture concerns behind it.
We won't focus here on business applications aside from what is required to present the blockchain purpose, more concrete business applications and evolutions will be the topic of another presentation I'll post in a few weeks
Overview of what is Bitcoin, Ethereum, Smart Contract and Blockchain.
First explained what is Bitcoin and its entities involved. Then Ethereum and what is called Blockchain.
Examples of the existing platforms those are using Ethereum.
Blockchain became a popular technology trend because of cryptocurrencies. But, this technology has its applications beyond the Bitcoin and other cryptocurrencies.
What is Blockchain?
Advantages of Blockchain
Working of Blockchain
Challenges Blockchain
Blockchain in Bitcoin
Satoshi Nakamoto brief intro
Blockchain Mining
Need & Types of Blockchain Mining
Crypto currencies usage is growing in a more connected world. The traditional banking industry is being disrupted by a decentralized network, rich in computing resources and connectivity.
Full quality version here -> https://www.scribd.com/document/333257162/Crypto-Currency-Mining-Science
Présentation pragmatique et accessible à tous niveaux sur la génèse du Bitcoin, ses principes de fonctionnement, concepts, mises en application et ses perspectives économiques potentielles. Il s'agit d'un survol synthétique, accessible - mais néanmoins complet - de la crypto-monnaie la plus connue.
Principales thématiques abordées : génèse du projet, blockchain, décentralisation, preuve de travail, minage, plateformes d'échanges, comment acheter / vendre / stocker, contextualisation avec d'autres actifs financiers (l'or), atouts et faiblesses.
1. What is Block Chain
2. How Does it Work
3. What are the key attributes of Blockchain
4. What are applications areas for Block Chain
5. What are the advantages and Disadvantages of Block Chain
Amazon EC2 provides a broad selection of instance types to accommodate a diverse mix of workloads. In this session, we provide an overview of the Amazon EC2 instance platform, key platform features, and the concept of instance generations. We dive into the current generation design choices of the different instance families, including General Purpose, Compute Optimized, Storage Optimized, Memory Optimized, and GPU instance. We also detail best practices and share performance tips for getting the most out of your Amazon EC2 instances.
Global trade of goods has been growing at double-digit rates since the early 2000s. Digitzation had its time; but still we have manual paper based work exsisitng in most of the Trade finance activities. Now is the time to see value addition from Blockchain based platforms and how they can make this process faster, reliable and paperless.
La technologie blockchain peut-elle s’insérer dans l’écosystème IoT pour adresser les problèmes de confiance, d’identité et de protection des données ?
Ce talk est une introduction à blockchain avec un focus sur son impact sur l’IoT.
The Blockchain - The Technology behind Bitcoin Jérôme Kehrli
The blockchain and blockchain related topics are becoming increasingly discussed and studied nowadays. There is not one single day where I don't hear about it, that being on linkedin or elsewhere.
I interested myself deeply in the blockchain topic recently and this is the first article of a coming whole serie around the blockchain.
This presentation is an introduction to the blockchain, presents what it is in the light of its initial deployment in the Bitcoin project as well as all technical details and architecture concerns behind it.
We won't focus here on business applications aside from what is required to present the blockchain purpose, more concrete business applications and evolutions will be the topic of another presentation I'll post in a few weeks
Overview of what is Bitcoin, Ethereum, Smart Contract and Blockchain.
First explained what is Bitcoin and its entities involved. Then Ethereum and what is called Blockchain.
Examples of the existing platforms those are using Ethereum.
Blockchain became a popular technology trend because of cryptocurrencies. But, this technology has its applications beyond the Bitcoin and other cryptocurrencies.
What is Blockchain?
Advantages of Blockchain
Working of Blockchain
Challenges Blockchain
Blockchain in Bitcoin
Satoshi Nakamoto brief intro
Blockchain Mining
Need & Types of Blockchain Mining
Crypto currencies usage is growing in a more connected world. The traditional banking industry is being disrupted by a decentralized network, rich in computing resources and connectivity.
Full quality version here -> https://www.scribd.com/document/333257162/Crypto-Currency-Mining-Science
Présentation pragmatique et accessible à tous niveaux sur la génèse du Bitcoin, ses principes de fonctionnement, concepts, mises en application et ses perspectives économiques potentielles. Il s'agit d'un survol synthétique, accessible - mais néanmoins complet - de la crypto-monnaie la plus connue.
Principales thématiques abordées : génèse du projet, blockchain, décentralisation, preuve de travail, minage, plateformes d'échanges, comment acheter / vendre / stocker, contextualisation avec d'autres actifs financiers (l'or), atouts et faiblesses.
1. What is Block Chain
2. How Does it Work
3. What are the key attributes of Blockchain
4. What are applications areas for Block Chain
5. What are the advantages and Disadvantages of Block Chain
Amazon EC2 provides a broad selection of instance types to accommodate a diverse mix of workloads. In this session, we provide an overview of the Amazon EC2 instance platform, key platform features, and the concept of instance generations. We dive into the current generation design choices of the different instance families, including General Purpose, Compute Optimized, Storage Optimized, Memory Optimized, and GPU instance. We also detail best practices and share performance tips for getting the most out of your Amazon EC2 instances.
27. living example : DAO
• Decentralized Autonomous Organization
• by slock.it
• crowdfunding
• vote by your share
• profit by your share
• child DAO
• to prevent abuse of majority voting
28. living example : DAO
• Recursive calling vulnerability
• propose a split -> execute the split -> withdraw
• propose a split -> execute the split -> propose a split ->
execute the split -> withdraw
31. living example : DAO
• function payOut
problem1
• address.call.value(amount)
• supply with enough gas
• if address refers to a contract, it triggers fallback function
• do what whatever you want as long as enough gas remaining
• call to splitDAO again in fallback function
32. living example : DAO
• function splitDAO
problem2
• cleans up his/her balance after sending the money
33. living example : DAO
• counter measure :
• use address.send(amount)
• 2300 gas
• don’t execute address.call.value(amount) to untrusted code
• limit gas in address.call.value(amount)
• address.call.gas(gas_amount).value(amount)
• cleans up the balance before sending money
• then check if sending succed, if not ,rollback
34. living example : DAO
• what happens after?
• votes for hard fork
• choose to stay, becomes ETC
• choose to fork, becomes ETH
• Ethereum foundation, token holders, immutability believers
• too much money to fail? lawsuits?
• what do you believe?