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🔗Bots de trading Bitfinanzas: https://bitfinanzas.com/servicios/
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Pagina Personal: http://danielmuvdi.com
CANAL DE TRADING (NO YT): https://lbry.tv/@DanielMuvdi:8
—————————————————————————————————————————
SEÑAL PELIGROSA DE CORRECCION EN BITCOIN ETHEREUM Y LA PELEA POR SMART CONTRACTS – DANIEL MUVDI

Recuerden, Daniel Muvdi y ningún miembro del TEAM DM jamás les dará teléfono ni correos, tampoco les pedirá dinero para ningún tipo de inversión, si reciben algún mensaje que tenga estas características es una ESTAFA !!!!!

La única manera de contactarnos es a través de las redes oficiales que están en la descripción del video. Saludos.

Suscríbanse, Like, Compartan recuerden darle a la campanita en “todas las notificaciones”

—————————————————————————————————————————
🎓 CURSO GRATIS COMPLETO DE TRADING GRATIS: https://www.youtube.com/watch?v=VsGl6…
📗 CURSO GRATIS DE CRIPTOMONEDAS Y PSICOLOGÍA DEL TRADING: https://www.youtube.com/watch?v=adDYp…
📘 CURSO GRATIS SOBRE NODOS EN CRIPTOMONEDAS: https://www.youtube.com/watch?v=OH1P6…

—————————————————————————————————————————
¡Recuerda Suscribirte!

🌎 Contactame en mis redes sociales:

Canal de discord Gratis https://discord.gg/Ktny7nT
Grupo de Facebook: https://www.facebook.com/groups/Grupo…
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Facebook: https://www.facebook.com/DanielMuvdiYT/
Twitter https://twitter.com/DanielMuvdiYT

Correo: danielmuvdiYT@gmail.com

Advertencia!

La inversión en mercados de riesgo como lo son las criptomonedas y otros activos puede llevar a pérdidas de dinero en este canal no nos hacemos responsables por el uso indebido de esta información, recordamos que el único propósito de estos videos es el Informativo

Muchas Gracias por su comprensión y bienvenido. wti daniel muvdi

There was a lot of news this week that got pushed aside because of the market turning red. We need to talk new contracts, stimulus, new partnerships, and large investments into Bitcoin by large companies!

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Nothing I say is meant to be taken as legal, tax or investing advice. For entertainment purposes only.

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******
DISCLAIMER: All Rock Cloud videos are strictly personal opinions. Please make sure to do your own research before investing in any digital asset or stock. Never take one person’s opinion for financial guidance. There are multiple strategies and not all strategies fit all people. Only invest what you can afford to lose. These videos ARE NOT financial advice.

Rosco Kalis of General Protocols & AnyHedge talks about the abilities and limits of smart contracts on Bitcoin Cash and how AnyHedge works – the new platform that permits you to long BCH or stabilize the fiat value of your BCH on-chain with a new oracle system. Great interview!

https://cashscript.org/
https://kalis.me/

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Contact on Telegram : @CryptoVal22
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🚀 CryptoVal Disclaimers 🚀

THIS IS NOT FINANCIAL ADVICE – Any Information you receive from CryptoVal is provided for educational, informational, and entertainment purposes only.

You should not make any decision, financial, investment, trading or otherwise, based on any of the information presented on this material without one’s own due diligence and consultation with a professional broker and/or financial advisory.

You understand that you are using any and all Information available, produced by CryptoVal, at your own risk. Buying Traffic may not be suitable for all people, please use caution.

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🚀 CryptoVal Disclaimers 🚀

– My channels are for entertainment purposes only Iam not a financial adviser nor am I recommending you invest in anything I talk about crypto is risky and has no guaranties. We can win or lose anything we put into crypto and you need to be aware of this. I make an affiliate commission if you do click an of my links and these affiliate commissions are available to anyone who shares a link. I am not a paid promoter and have never accepted payment or any sort of compensation for making my videos.
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This Automated System is a powerful on demand digital marketing education suite and engine for all businesses in any niche and gives all people worldwide the opportunity to learn and earn instant and direct peer to peer payments in Bitcoin for Sharing this powerful e-learning suite with others worldwide.

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Forsage is a Ethereum earning program that functions on a Smart Contract. It allows you to work from home or anywhere you choose, as you see your account grow with crypto earnings. The program is powerful, flexible and has no time limits, targets, or pressure. Forsage works on the specific features of the Ethereum Cryptocurrency, allowing users to earn a long-term residual Ethereum income through a powerful referral system.

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=================================================
Must Watch Videos!
– Interview with CZ Binance CEO – https://youtu.be/mF-iCOlnL_8
– Interview with Rain Crypto Exchange Co-founder – Rain is the first regulated Crypto Exchange in the Middle East – https://youtu.be/Bdz0YTTipJE
– $100 Million Bitcoin Mining IPO on NYSE or Nasdaq – https://youtu.be/5TStZ_LnKDk
=================================================
#Bitcoin #Ethereum #XRP #Ripple #Crypto #Cryptocurrency #Blockchain
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and contained the following message in its coinbase transaction:
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– YouTube Cancels Cointelegraph’s BTC Halving Livestream for Being ‘Harmful Content’
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– Total AUM of crypto hedge funds doubled to over $2 billion in 2019, according to a new report by PwC and Elwood Asset Management
=================================================
Bitcoin, BTC, Bitcoin Halving, Bitcoin Mining, Crypto, Cryptocurrency, Crypto Market, Ethereum, Eth, XRP, Ripple, Tezos, XTZ, Chainlink, Blockchain, Altcoins, Alt Season, DeFi, Binance, Coinbase, Tokens, Coins, Stocks, Recession, Inflation, Fed, Federal Reserve, Donald Trump, Crypto Regulations, bakkt, Fidelity Digital Assets, ErisX, Grayscale Investments, Bitcoin News, Crypto News, Bull Run, Bitcoin Price, Bitcoin Price Prediction
=================================================
Disclaimer – Thinking Crypto and Tony are not financial or investment experts. You should do your own research on each cryptocurrency and make your own conclusions and decisions for investment. Invest at your own risk, only invest what you are willing to lose. This channel and its videos are just for educational purposes and NOT investment or financial advice.

Nexxus Coin http://nexxuscoin.com (My Ether Wallet & Ether Delta Tutorials english/espanol)
EtherScan http://etherscan.io
Exodus http://exodus.io
Coinomi https://coinomi.com/
Blockchain Demo https://anders.com/blockchain/
Nexxus Graphical Business Summary http://nexxuspeople.com
It’s time to ditch Skype and TeamSpeak. Discord https://discordapp.com/

BNB launches smart contracts, Swiss Crypto Valley in Ruins, Bloomberg Condemns Fed
—————————–

Check out my other channels:

My other channels and subscribe!
https://www.youtube.com/channel/UCMAe… — Food channel
https://www.youtube.com/user/Iamaninj… — Photography channel and backup crypto stream

https://www.youtube.com/channel/UC3La… — Crypto Update channel, 1 video per day summarizing all of the day’s important crypto events

My other social media:
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*this is not financial advice, trade at your own risk

Please consider supporting me on Patreon:
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BNB launches smart contracts, Swiss crypto valley hit by Virus, DSLR still dominate photo awards
Paypal donation address: webmaster@java-gaming.com

*This is for entertainment purposes only, not financial advice

Speaker: Edison Lim

Blockchain is a topic of great interest, and it has the potential to radically change the economy that we know of today. At the core is the idea is decentralised application – which consists of smart contracts that could connect any developers to a network of global liquidity through public blockchain network. Blockchain and smart contract could potentially be more efficient in bringing together multiple parties to work together, automating process flow and bringing efficiency through automated pieces of pre-agreed logic called smart contract.

What is blockchain?
What are decentralised apps and how they are different from other apps
Getting started with smart contract programming and dApp development

Profile:
Edison is a software engineer who specialises in blockchains, web application and data. He has spent the last three years on blockchain development and has experience working on Ethereum, Hyperledger Fabric and Zilliqa blockchain. In his past roles, he has built a security tokenisation technology, custody software and token exchange.

Edison is currently the Head of Engineering at Aqilliz – a Singapore-based marketing technology company which aims to make marketing more efficient and transparent. Before joining Aqilliz, Edison is the Application Engineering Lead and the first application engineer at Zilliqa, a Singapore-based high-throughput and secure public blockchain platform. Zilliqa is the first to implement sharding, a technology that improves the transactional capacity of a public blockchain network and is famous for the creation of a new smart contract programming language called Scilla.

Edison holds an M.Sc from Carnegie Mellon University and is an avid guitarist and amateur cook.

https://twitter.com/EdisonLimjh
https://www.linkedin.com/in/edisonljh/
https://github.com/edisonljh

Event Page: https://www.meetup.com/Junior-Developers-Singapore/events/269002731/

Produced by Engineers.SG

http://0x1.tv/20191115AI

Agile Software Development Automated by Blockchain Smart Contracts (Michele Marchesi, SECR-2019)
* Michele Marchesi

————-

In this work we produced a prototype of framework where Scrum Agile Development is enhanced and automated by Smart Contracts deployed on an Ethereum blockchain testnet.

Product Owner duties are relieved and automated by the Solidity code into the Smart contracts.

Process workflow is transparent, fully recorded and accessible to authorized actors on the blockchain.

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We put significant emphasis on providing our clients with the ultimate security by considering a comprehensive threat model, implementing a full range of security solutions, and running regular penetration tests, security audits, and a bug-bounty program…

In this video we take an in depth look at the Ethereum Cryptocurrency. We talk about Smart Contracts, Ethereum 2.0 and Defi. I hope you guys get some valuable information from this video. Please Like, Subscribe and Share with your friends, family and workmates. Cheers.

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SCENERY AND MUSIC VIDEO USED: https://youtu.be/O7tYVSP3juo

CRYPTOCURRENCY WALLET GUIDE: https://blockgeeks.com/guides/cryptoc…

SOURCES:
https://ethereum.org/what-is-ethereum/
https://ethereumprice.org/updates/what-is-decentralized-finance-defi/
https://blog.sfox.com/ethereum-2-0-what-the-next-three-years-of-ethereum-will-look-like-b366a46f9704
https://btcmanager.com/what-sharding/?__cf_chl_jschl_tk__=6ff38413560d7451bb56ac5dcf3132028c07ac67-1576889847-0-Ac3gdOXrvhJTFqjYqHd9VTS8bpvBuA__1icL2VNy4geFZ8ksLmstFni-6_feBK199ym54yQpzYSmx1EXvl45lgloXs-AYzquQfPPuN4Cg3xSgaiQpla2t1Y47XR0UI2mzrcizVrhjl_Br6dxD9ZSajSETPNj9r7vt4tA4YOaMVifFieVSIBhZyZns6Sd4AUHLAxgMOEU7ljkh4UM0dCnNZRMsaYQqiz83jQQdGdypRItWlD3xA4a_QiI6ZVRQqB7IJhtaiyrH5dpCUmqwqiv0Zo
https://blockgeeks.com/guides/smart-contracts/

NEXO DEFI PLATFORM: https://platform.nexo.io/

***THIS IS NOT FINANCIAL ADVICE, JUST MY OPINIONS INTENDED FOR ENTERTAINMENT PURPOSES ONLY. DO NOT EVER INVEST IN ANYTHING JUST BECAUSE SOMEONE ELSE SAYS SO. DO YOUR OWN RESEARCH***

One of the hottest technologies of late is no doubt Blockchain. But what is a blockchain?Put simply, a blockchain is a digital transaction of records that’s arranged in chunks of data called blocks. These blocks then link with one another through a cryptographic validation known as a hashing function. Linked together, these blocks form an unbroken chain — a blockchain. A blockchain is programmed to record not just financial transactions but virtually everything of value.
Still confused about what can a blockchain really do? In this session, you will learn the fundamentals of blockchain, as well as learn how to implement Smart Contracts using Ethereum.

NDC Conferences
https://cph.ndcmini.com
https://ndcconferences.com

The Initial Coin Offering (ICO) boom has been powered by smart contracts, making them a hotter and more lucrative target than ever before. One might expect that being well-funded by security-sensitive investors would be enough to save this technology from the security sins of its forebears. Unfortunately, smart contract security is poorly understood, even by some of the field’s most prolific and successful developers. However, the wider Ethereum community is working to change that. An amalgam of academics, security enthusiasts, and industry professionals have created the first generation of audit and development practices focused on defense of smart contracts, along with a nascent tool suite to augment them.

This talk presents a digestible but robust set of tools and practices used by the authors to find real vulnerabilities in real contracts during the course of their work as security consultants. Audience members who develop smart contracts will leave with a strong understanding of development and test best practices to make sure they are not the next to be “popped”, while those interested in auditing them will learn a battle-tested practicum for finding vulns in the wild.

One of the hottest technologies of late is no doubt Blockchain. But what is a blockchain? Put simply, a blockchain is a digital transaction of records that’s arranged in chunks of data called blocks. These blocks then link with one another through a cryptographic validation known as a hashing function. Linked together, these blocks form an unbroken chain — a blockchain. A blockchain is programmed to record not just financial transactions but virtually everything of value.

Still confused about what can a blockchain really do? In this session, you will learn the fundamentals of blockchain, as well as learn how to implement Smart Contracts using Ethereum.

NDC Conferences
https://ndcminnesota.com
https://ndcconferences.com

There has been a recent explosion of interest in blockchain-based distributed ledger systems such as Bitcoin, Ethereum, and many others. Much of this work originated outside the distributed computing community, but the questions raised, such as consensus, replication, fault-tolerance, privacy, and security, and so on, are all issues familiar to our community.

This talk surveys the theory and practice of blockchain-based distributed systems from the point of view of classical distributed computing, and how treating blockchains as a distributed computing problem simplifies everything.

One of the hottest technologies of late is no doubt Blockchain. But what is a blockchain? Put simply, a blockchain is a digital transaction of records that’s arranged in chunks of data called blocks. These blocks then link with one another through a cryptographic validation known as a hashing function. Linked together, these blocks form an unbroken chain — a blockchain. A blockchain is programmed to record not just financial transactions but virtually everything of value.
Still confused about what can a blockchain really do? In this session, you will learn the fundamentals of blockchain, as well as learn how to implement Smart Contracts using Ethereum.

NDC Conferences
https://ndcoslo.com
https://ndcconferences.com

A panel on March 3, 2017, on Smart Contracts feature panelists Christian Catalini, Fred Kayne (1960) Career Development Professor of Entrepreneurship and Assistant Professor of Technological Innovation, Entrepreneurship, and Strategic Management, MIT Sloan School of Management; Charley Cooper, Managing Director, R3; Nina Kilbride, Head of Legal Engineering, Monax Industries, Ltd.; Scott O’Malia, Chief Executive Officer, International Swaps and Derivatives Association; and moderator Alexander Dyck, Professor in Corporate Governance and Professor of Finance and Business Economics, the University of Toronto Rotman School of Management, Academic Director of the Director’s Education Program, and YLS Visiting Senior Research Scholar.

Your Daily Fix Of Cryptocurrency, Blockchain, Bitcoin, & Ethereum News – Friday, August 30th, 2019
😀 𝙏𝙝𝙖𝙣𝙠 𝙔𝙤𝙪 𝙁𝙤𝙧 𝙒𝙖𝙩𝙘𝙝𝙞𝙣𝙜!

► CME Futures Article – https://www.trustnodes.com/2019/08/30/bitcoins-price-tends-to-rise-after-cme-futures-expire
► Bollinger’s Puzzling Bitcoin/Alt Price Prediction – https://twitter.com/bbands/status/1167460723171061760
► Updated CMC Rankings Coming – https://blog.coinmarketcap.com/2019/08/30/updated-ranking-methodology-new-liquidity-metric-soon/
► Aragon Founder Denounces Facebook Libra – https://cryptobriefing.com/aragon-dao-facebook-crypto/
► Lightning Network Vulnerability – https://lists.linuxfoundation.org/pipermail/lightning-dev/2019-August/002130.html
► Mike Novogratz’ Current Market Thoughts – https://www.forbes.com/sites/billybambrough/2019/08/30/billionaire-investor-promises-bitcoin-revolution-will-happen-eventually/#734b97031bda
► Ethereum OPCODEs – https://ethervm.io/
► Hard Fork Raising Concerns Over EIP 1884 – https://eng.ambcrypto.com/ethereum-istanbul-hard-fork-developer-raises-concerns-over-implementation-of-eip-1884/
► Bug In Parity Client – https://www.coindesk.com/amberdata-discovers-rpc-call-bug-in-parity-ethereum-client
► China’s CBDC Is “speculation” – https://twitter.com/globaltimesnews/status/1166544019192549376
► China’s Digital Bank Currency Research By Binance – https://info.binance.com/en/research/marketresearch/CBDC.html#fn14
► 40 Million ETH Added To Supply In 3 Years – https://www.trustnodes.com/2019/08/29/40-million-eth-added-to-supply-in-the-past-three-years
► Brexit Is Forcing Coinbase To Move Euro Accounts – https://www.trustnodes.com/2019/08/30/brexit-forcing-coinbase-to-move-euro-accounts
► PNC = First Bank On RippleNet – https://www.fintechfutures.com/2019/08/pnc-becomes-first-us-bank-on-ripplenet/
► RippleNet Site – https://www.ripple.com/ripplenet/
► Coinbase Research Shows Education For Crypto Has Grown – https://blog.coinbase.com/highereducation-c4fb40ecbc0e
► Boeing Joins Hashgraph Governing Council – https://www.coindesk.com/boeing-becomes-latest-member-of-hedera-hashgraphs-governing-council
► Anne Frank Quote – https://twitter.com/rogerkver/status/1167085875383037953

🚩 Remember to subscribe and hit the bell “🔔” icon, so you don’t miss your daily cryptocurrency news!
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💎►Donate Ether and Ethereum-Based Tokens: 0x1466032B4F0F13910DA35B16371807428CB40714
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💎►Donate Using Paypal: https://goo.gl/7m1X4Z
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(っ◔◡◔)っ 𝙈𝙐𝙎𝙏 𝙃𝘼𝙑𝙀
► Ledger Nano S Crypto Hardware Wallet – https://bit.ly/2TQG8PZ
► Personal Book Recommendations, Crypto Clothing, & More – https://www.amazon.com/shop/obham001
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**Nothing I state, share, express, or allude to should be considered professional advice or recommendations of action. This channel is intended for educational and entertainment purposes only. All content contained within is all just my own opinion and experience. Consult a professional (or two…or more) for any tax, accounting or legal related questions you may have.
#bitcoin #ethereum #cryptocurrency #blockchain #crypto
#economics #investing #trading #futurism #cryptonews
#btc #eth #eos #litecoin #technology

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Photo Credit To:
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APOLLO CURRENCY VISION AND ROADMAP 2019/2020!
https://medium.com/@apollocurrency/announcing-apollo-2020-vision-42afdabb1003
CHAINLEAK APOLLO ARKNET ARTICLE!
https://chainleak.com/2019/08/10/apollo-post-blockchain-technology/

ADF PARTNERSHIP BREAKDOWN WITH APOLLO CURRENCY AFRICA- ARTICLE FILLED WITH FACTS THAT ASTOUND!
https://medium.com/@cryptouniverse101/international-investment-company-is-advancing-cryptocurrency-adoption-across-africa-a8a6e5568546

BUY APOLLO WORLDWIDE!
https://www.bitmart.com/trade/en

MY VIDEOS ON COIN GECKO’S TV WEBSITE
https://www.coingecko.com/en/channels/toptech-services

APOLLO WIKI PAGE!
https://www.apollowiki.net/index.php?title=Main_Page

PAXOS WEBSITE
https://www.paxos.com/pax/

APOLLO REVIEW!THE CRYPTO VAPER CHANNEL https://www.youtube.com/watch?v=FgHmdUdbASY

FORBES ARTICLE TOP PRIVACY COINS CAN WE SAY APOLLO!
https://www.forbes.com/sites/geraldfenech/2019/01/24/the-privacy-coin-dilemma-what-are-the-options-on-offer/#3bbdecc6707d

Awesome Apollo Article! https://hacked.com/apollo-currency-apl-has-top-twenty-altcoins-in-sights-with-418-weekly-growth/

FORBES ARTICLE!
https://www.forbes.com/sites/geraldfenech/2019/01/08/case-study-identifying-the-best-featured-cryptocurrency/#78e39e107ef2

BUY APOLLO GEAR AT THEIR ONLINE STORE!
https://apollocurrency.org/

https://www.apollocurrency.com/

BUY APOLLO WORLDWIDE!
https://www.bitmart.com/trade/en

https://www.idax.pro/#/

https://medium.com/@apollocurrency

TROJAN/MALWARE PROTECTION THE BEST!
https://www.malwarebytes.com/

APL CRYPTOSLATE SITE
https://cryptoslate.com/coins/apollo-currency/

HAVE FUN-https://aircoins.co/

MY CHANNEL
https://www.youtube.com/channel/UCUnu83Ff49Aqs3jOWR6lkaA?

APOLLO TWITTER PAGE FOR APL BREAKING NEWS
https://twitter.com/ApolloCurrency

L.A. TIMES ARTICLE
https://www.latimes.com/dp-ugc-article-which-crypto-project-will-be-the-best-perform-2019-01-02-story.html

Crypto is useful enough to create a whole new future, says CZ as he addresses wash trading concerns

https://finance.yahoo.com/news/real-consequences-cryptocurrency-market-manipulation-090045377.html

https://dailyhodl.com/2019/07/10/coinbase-and-ripple-back-ethereum-eos-and-tron-competitor/https://dailyhodl.com/2019/07/10/coinbase-and-ripple-back-ethereum-eos-and-tron-competitor/

https://fortune.com/2018/06/06/ripple-codius/

Follow me on Twitter: @moonlamboio

DISCLAIMER: I am not a financial adviser. None of what I have communicated verbally or in writing here should be considered financial advice; it is not. Do your own research before investing in any digital asset, and understand that investing in any cryptocurrency is inherently risky. If you do, you need to be prepared to lose your entire investment.

Die Folien vom Vortrag bekommst du hier: https://i-unlimited.de/youtube

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Verpasse kein YouTube Video mehr: https://i-unlimited.de/youtube
Kryptowährungen kaufen erklärt: https://julianhosp.com/de/sicherbitcoinkaufen/

► Willst du wissen, wie die erfolgreichsten Menschen der Welt, Business, Beziehungen und eigene Hobbies unter einen Hut bekommen? Lese Julians neuesten Bestseller “Das Timehorizon Prinzip”: https://buch.i-unlimited.de/timehorizon

► Komplett NEU? Hier mein Buch “Kryptowährungen einfach erklärt”: http://geni.us/krypto_einfach

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https://products.cryptofit.de/cryptofitakademie

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https://products.cryptofit.de/blockchainakademie

Wenn dir das Video gefallen hat, abonniere meinen Kanal, gib einen “Daumen hoch” und teile dieses Video um gemeinsam AT, DE und CH #cryptofit machen 🙂

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Mein Name ist Dr. Julian Hosp oder einfach nur Julian.
In meinen Videos geht es um Bitcoin, Ethereum, Blockchain und Kryptowährungen generell, um Scam, Abzocke und Betrug besonders im Mining keinen Platz zu geben. Ich spreche darüber, wie du schlau investieren kannst und das Ganze rational und simpel angehst. Viel Spaß!

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Linda Xie, Co-Founder and Managing Director, Scalar Capital

How do Bitcoin, blockchain, smart contracts and ICOs really work? And where will we first see these frameworks used to operate and protect businesses? In this fast-moving seminar, leading experts will guide attendees through the core elements of bitcoin, distributed systems and smart contracts. Technology and legal practitioners—the front line—look for pockets of crypto opportunity, design for scale and craft for regulatory approval. Participants will see how the dark side of today’s attacks and scams has already changed operational security, the regulatory landscape and legal considerations.

David Chan, CyberSecurity Sr Mgr, E&Y LLP

How do Bitcoin, blockchain, smart contracts and ICOs really work? And where will we first see these frameworks used to operate and protect businesses? In this fast-moving seminar, leading experts will guide attendees through the core elements of bitcoin, distributed systems and smart contracts. Technology and legal practitioners—the front line—look for pockets of crypto opportunity, design for scale and craft for regulatory approval. Participants will see how the dark side of today’s attacks and scams has already changed operational security, the regulatory landscape and legal considerations.

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In this paper, a new replay attack based on Ethereum smart contracts is presented. In the token transfer, the risk of replay attack cannot be completely avoided when the sender’s signatures are abused, which can bring the loss to users. And the reason is that the applying scope of the signatures is not properly designed in the smart contracts. To test and verify this loophole, we selected two similar smart contracts for our experiment, at the same time, we used our own accounts in these two contracts to carry out the experiment. Because the same signatures of the two contracts were used in the experiment, we got a double income from sender successfully. The experiment verified that the replay attack is really exist. Besides, the replay attack may exist in multiple smart contracts. We calculated the number of smart contracts with this loophole, as well as the corresponding transaction activities, which find some Ethereum smart contracts are risked for this loophole. According to the vulnerability of the contract signature, the risk level is calibrated and depicted. Furthermore, the replay attack pattern is extended to within contract, cross contract and cross chain, which provide the pertinence and well reference for protection. Finally, the countermeasures are proposed to fix this vulnerability.

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