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Bruxelles
Benjamin [email protected]
Nicolas Van [email protected]
http://www.meetup.com/fr-FR/Meetup-Blockchain-Ethereum-Bruxelles/
Blockchain
Ethereum
Kraken
Mist
Coding
Mining
In 2008, Bitcoin was launched as a peer-to-peerdatabase that relied on a new data structurereferred to as the ‘blockchain’.
■The blockchain consists of blocks, where eachblock holds a set of transactions and areference to the previous block. This helpedcreate a chain of all transactions that everoccurred.
■This data structure is replicated across allparticipating nodes so that every participant isaware of the transactions without having to getthem from a central authority.
Blockchain
What is in the
blockchain ?
Bob
Claire
Jean
Bob
Claire
Jean
Bob
Claire
Jean
Bob
Claire
Jean
Transaction block chains
Adding blocks to the chain
~ 10mins for bitcoin~10 sec for ether
Mining Rig
An application-specific integrated circuit (abbreviated as ASIC) is an integrated circuit (IC) customized for a particular use, rather than intended for general-purpose us
https://github.com/ethereum/webthree-umbrella/releases
Try Mining within a pool
Ethereum.exe windows install
ethminer.exe -F http://eth1.nanopool.org:8888/0xc4Ff503879fe07ac61e10a393F51f5e8E3A037d0/miner1 -G
Do NOT use CONTRACT addresses for mining.
check workerhttp://nanopool.org/account/0xc4Ff503879fe07ac61e10a393F51f5e8E3A037d0
check balancehttps://etherscan.io/address/0xc4Ff503879fe07ac61e10a393F51f5e8E3A037d0
What is Pooled Mining Ether miners join mining pools, which are groups of people who combine the processing power of multiple computers to generate Bitcoins and they distribute any bounty generated
https://github.com/ethereum/webthree-umbrella/releases
Mining Stats/Profitability
Distributed Consensus
Secure
Transparent
Blockchain
Ethereum
Contract
Ethereum
Contract
Ether
• Slow (code runs 5-1000x slower than native code)
• Expensive to use (basic computation, memory and storage cost are ~1950s levelsnot always immediatlydecisive(action of the last 60sec may be reorganised)
Cons
Ethereum is a “world computer”: a place where anyone can upload and run programs that are guaranteed to be executed exactly as written on a highly robust and decentralized consensus network consisting of thousands of computers around the world.
• Cannot failed, becensored, be stopped
• Trully global singleton (one computer for the planet for now and forever)
• Ubiquitous wherever thereis internet there isethereum
• Natively multi user (has as many account as isneeded)
• Accessible (wherever thereis javascript there isethereum)
• Verifyable & auditable (all code honoured now and forever)
Pros
Ethereum
ContractEther
Ethereum is versatile
Blockchain for All !
Contract
If a contract does not include any programmed instructions, it behaves as an account. It has an address and a balance. This account can receive/send ethers from/to other accounts/contracts.
Ether is required to call a contract, this is done to ensure that infinite execution does not occur as the execution stops the moment the ether amount sent along with the call is consumed
When a contract is called, a small amount of ether is required to be sent along with the call. However, when a contract is called, an amount of ether can be directly transferred to that contract there by instituting a balance transfer like in the case of a payment
Which Exchange Office?
What about Kraken’s Tier levels?
Before Trading, you need Funding
Trading: Dashboard
Two-factor Auth
Trading: New Order
Trading: Ledger
Trading: Trends
Mist –Ethereum Wallethttps://github.com/ethereum/mist/releases
Meetup Contract
• Address : 0xc0D801061070FB92622d1d58Fe27872F07F0ea60 • Balance : 0• Fields
• Members (list of member)• nextMeetupDescription• nextMeetupDate• Votes
• Methods• Vote• AddMember• NewMeetupProposal• ExecuteProposal
• Events• Vote• AddMember• NewMeetupProposal• ExecuteProposal
Hashtable
Inheritance
Modifier
LLL, Serpent, and Solidity all can be used to write
contracts
Events
Thanks !
Source: Dr Gavin Wood (ethereum.org)Vitalin Butelik (ethereum.org)Ethereum white paper https://github.com/ethereum/wiki/wiki/White-Paper#code-executionFabian Vogelsteller feinduraTerek Judi Ethereum Ontario
