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Ethereum Quiz

What Is The Correct Format To Pass Array Data Into A Solidity Function Call For Processing?

What Is The Correct Format To Pass Array Data Into A Solidity Function Call For Processing?

What is the correct format to pass array data into a solidity function call for processing? ["1", "gas", "truffle", "ganache", "solidity", "metamask"] Which error are you talking about? The screenshot you shared showed several errors. The one about "Unexpected end of JSON input" I could not reproduce. When I passed the values you've shared here via Remix, the transaction happened (but reverted, presumably due to the hashes not matching). smarx Jan 23 at 5:04 From looking at the hashes in the code, I think you, e.g., hashed "1" to get the first value, but if you're passing in a bytes32, "1" will be converted to the (in hex) 0x3100000000000000000000000000000000000000000000000000000000000000. The hash of that is 0x20463d390a03b6e100c5b7cef5a5ac0808b8afc4643ddbdaf1057c610f2ea121. smarx Jan 23 at 5:08 I don't think that is the issue because when I check 1 answer it returns true here I am submitting via remix and MEW: youtu.be/nkQwa7t36N8?hd=1 Thomas Miller Jan 23 at 5:36 I didn't see anywhere in your video where you "check 1 answer [and] it returns true." smarx Jan 23 at 5:45 But checkAnswer probably works, since it takes a bytes instead of a bytes32 and thus doesn't get padded data. smarx Jan 23 at 5:46 Continue reading >>

Trumpcoin Or Pizzacoin? Quiz And Facts About Cryptocurrency

Trumpcoin Or Pizzacoin? Quiz And Facts About Cryptocurrency

Trumpcoin or Pizzacoin? Quiz and Facts About Cryptocurrency Cryptocurrency is a hot topic of today. Celebrities invest in bitcoins, farmers switch to crypto farms, the Wall Street Journal publishes dogecoin exchange rates. Are you informed enough to join the cryptocurrency conversation with your colleagues? Check your knowledge with our quiz! Test your knowledge of cryptocurrency in StopAds quiz! Didnt have all the answers? Dont worry, you can find them below, among other interesting facts about cryptocurrency. Bitcoin was invented by someone who names yourself Satoshi Nakamoto. Rumors abound about the face behind this name, though no one really knows for sure who it is. Suspects include an Australian entrepreneur named Craig Wright, the currency enthusiast Nick Szabo, the first software user (after Nakamoto itself) Hal Finney, and even the US government. As of May 2017, Nakamoto is believed to own about 1 million bitcoins valued at more than $2 billion. Cryptocurrency blockchain with the largest number of transactions per day is Ripple. Not Bitcoin. Bitcoin is the cryptocurrency with the biggest market cap (as high as $73.5 billion). If bitcoin were a stock (it isnt), it would be the seventy-fourth biggest by market capitalization, just behind Adobe and Netflix. Ripple provides a universal infrastructure for international money transfers, so many banks and other financial institutions use its protocol, including Unicredit, SEB, and UBS. There are more than 1175 cryptocurrencies in the world. All of which can be found here: Coinmarketcap . You can find dogecoin with the meme dog ($280 million market cap), potcoin for the cannabis community ($22 million market cap), Pandacoin ($1.6 million market cap) and the cheapest, CaliphCoin ($65 market cap). The bitcoin mining con Continue reading >>

How Blockchained Are You? Quiz

How Blockchained Are You? Quiz

Take part in our quiz with Cointelegraph and TrueFlip for a total prize pool of 1 BTC equivalent. Cointelegraph launches a week-long competition in partnership with the TrueFlip Blockchain-powered lottery, with a total prize pool of 1 bitcoins worth of TrueFlip tokens. Each day, until June 27, we will ask you three Blockchain-themed questions on Facebook. The three people to give us the largest number of correct answers will be declared the winners! Do you feel confident about your Blockchain and Bitcoin knowledge? Test yourself by taking part in our quiz! A Blockchain-themed quiz prepared by Cointelegraph in collaboration with TrueFlip. 1. You must be subscribed to both Cointelegraph s and TrueFlip s Facebook pages. 2. We will post 20 questions to our Facebook page. They will be posted 3 times a day: 9 a.m., 1 p.m., and 5:00 p.m. UTC. You are required to leave your answers in the comments section as quickly as possible. June 27, 2017, at 11:59 p.m. UTC. Answers sent after this date will not be accepted. There will be three winners determined by the total number of correct answers. They will receive 1000, 600 and 400 TrueFlip tokens, equal in value to 0.5, 0.3 and 0.2 BTC respectively. In the case of a tie, the winner will be determined by the time at which they have been submitting their answers - the earlier, the better, so be quick! ______________________________________________________________ Competition entrants are required to be at least 18 years of age in order to participate. Continue reading >>

Quiz 3 Quiz - Dcorp Academy

Quiz 3 Quiz - Dcorp Academy

1. Which of the following is NOT a function of the ERC20 token standard? 2. The two events of the ERC20 token standard are event Transfer and Approval. 3. Ether is a necessary element, also known as fuel, for operating the distributed application platform Ethereum. 4. Which of these statements are true about the Ethereum Mist Wallet? 5. When using the Ethereum Mist Wallet, you do not need to download the entire Ethereum blockchain. 6. Ledger Nano S users can store ERC20 tokens after setting the device up with MyEtherWallet. 7. Which of these is not a step when setting up TREZOR to store ERC20 tokens? 8. MetaMask gives users the same functions and features of other Ethereum wallets. 9. These are the steps to store ERC20 tokens on the Ledger Nano S: i. Go to MyEtherWallet and select Send Ether & Tokens ii. Plug in the Ledger Nano S device and select the Ethereum application. iii. Select the HD derivation path and the addresses you want to manage. iv. Send or receive digital currencies. 10. When using the Ethereum Mist Wallet, the multi-signature feature decreases the level of security, especially if you store your secondary accounts on other computers. 1. Which of the following is NOT a function of the ERC20 token standard? 1. Which of the following is NOT a function of the ERC20 token standard? 2. The two events of the ERC20 token standard are event Transfer and Approval. 3. Ether is a necessary element, also known as fuel, for operating the distributed application platform Ethereum. 4. Which of these statements are true about the Ethereum Mist Wallet? 5. When using the Ethereum Mist Wallet, you do not need to download the entire Ethereum blockchain. 6. Ledger Nano S users can store ERC20 tokens after setting the device up with MyEtherWallet. 7. Which of these is not a Continue reading >>

Frequently Asked Questions

Frequently Asked Questions

How long should it take to download the blockchain? The Ethereum blockchain is constantly growing, and is nearing 10GB as of March 2016. The amount of time it will take to download depends on the amount of peers you are able to connect to, your internet connection speed, and other factors. See the :ref: How do I get a list of transactions into/out of an address? You would have to pull the transactions manually out of the blockchain to achieve this. Alternatively, you can rely on third party explorers APIs like Etherchain . For contract execution transactions however, you can filter the contract logs to achieve this. Can a transaction be sent by a third party? i.e can transaction broadcasting be outsourced Technically yes, but there is an important restriction as opposed to bitcoin signed transactions: in ethereum the transaction has a nonce (more precisely, each account increases a counter when sending a transaction based on how many transactions total have been sent. If 3 transactions have ever been sent from the account, the account nonce would be 3). Can Ethereum contracts pull data using third-party APIs? No, Ethereum contracts cannot pull data from external information sources in this way. It is however possible to push data from external sites (e.g. weather sites, stock prices) to Ethereum contracts through transactions. There are oracle services that are compatible with the Ethereum network that will pull/push data to the Ethereum network for a fee. Is the content of the data and contracts sent over the Ethereum network encrypted? Data and contracts on the Ethereum network are encoded, but not encrypted. Everyone can audit the behavior of the contracts and the data sent to them. However, you are always free to encrypt data locally before broadcasting it to the n Continue reading >>

Quiz: This Week's Bitcoin News

Quiz: This Week's Bitcoin News

Oct 4, 2015 at 14:49 UTC|UpdatedOct 5, 2015 at 13:56 UTC With arrests, funding announcements and banking partnerships, it's been a busy week in the world of bitcoin and blockchain technology. Have you been paying attention? Take our 'This Week in the World of Bitcoin' quiz for 28th September - 4th October to find out. Remember to subscribe to our daily newsletter to keep up to date with all the latest bitcoin and blockchain news. Are you up to date with the latest bitcoin and blockchain related news? Test your knowledge with our latest quiz. Are you up to date with the latest bitcoin and blockchain news? Test your knowledge with our quiz for the week commencing 19th October. Are you up to date with the latest bitcoin and blockchain news? Test your knowledge with our quiz for the week commencing 12th October. Are you up to date with the latest bitcoin and blockchain news? Test your knowledge with our quiz for the week commencing 5th October. The SECs analysis of DAO tokens being securities will have what sort of impact on token sales going forward? (select all that apply) Token sales will fall in quantity but rise in quality More token sales will start requiring accreditation More token sales will start excluding potential U.S. investors Investors will be more cautious and diligent on the token sales they invest in Exchanges will not list tokens as quickly and nonchalantly Venture capital funding will rise relative to token sale funding None of the above, token sales will continue similarly to how they have been I would like to receive the following emails: CoinDesk Weekly - Insights for the week ahead CoinDesk Daily - Our snapshot of the day's news Subscribe to our free newsletter and follow us Continue reading >>

Cryptokitties Craze Slows Down Transactions On Ethereum

Cryptokitties Craze Slows Down Transactions On Ethereum

CryptoKitties craze slows down transactions on Ethereum These are external links and will open in a new window A new craze for virtual kittens is slowing down trade in one of the largest crypto-currencies. CryptoKitties lets players buy and breed "crypto-pets" on Ethereum's underlying blockchain network. The game's developers told the Bloomberg news agency that CryptoKitties was a "key step" to making blockchains more accessible. But its popularity has underscored one of the technology's biggest downsides: its lack of scalability. Etherscan has reported a sixfold increase in pending transactions on Ethereum since the game's release, by the Axiom Zen innovation studio, on 28 November. "CryptoKitties has become so popular that it's taking up a significant amount of available space for transactions on the Ethereum platform," said Garrick Hileman, from the University of Cambridge. "Some people are concerned that a frivolous game is now going to be crowding out more serious, significant-seeming business uses." An estimated $4.5m (3.35m) has been spent on the cartoon cats at the time of writing, according to Crypto Kitty Sales . Image caption CryptoKitties is the first game built on Ethereum Think of these rather unpalatable cartoon kittens as unique digital Pokemon cards. The game's developers describe them as "breedable Beanie Babies", each with its own unique 256-bit genome. These crypto-collectibles are also gender-fluid, able to play the role of either the "dame" or the "sire" when bred together. The kitties' unique DNA can lead to four billion possible genetic variations. Some of the varieties created so far look lifelike, with grey striped fur and bulging green eyes. Others are speckled with neon-blue spots or magenta-patterned swirls. Image caption One of the less at Continue reading >>

Bitcoin Signing Algorithm - , Coinbase Bitcoin Quiz, Litecoin Vs Bitcoin Which To Buy

Bitcoin Signing Algorithm - , Coinbase Bitcoin Quiz, Litecoin Vs Bitcoin Which To Buy

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Bitcoin, Ethereum And Almost Every Other Cryptocurrency Is Plunging

Bitcoin, Ethereum And Almost Every Other Cryptocurrency Is Plunging

Look away now if you own bitcoin or other cryptocurrencies. This wont be breaking news to you if you are invested, but today has seen the entire crypto market fall by double-digit percentages. The price of bitcoin slumped by 15 percent to drop below $12,000 for the first time since December 4. Ethereum, meanwhile, fell by over 20 percent to hover above $1,000 and Ripple is down 33 percent to $1.23 at the time of writing. The price drop is having a huge impact. According to Coinmarketcap.com , a site that is quickly becoming the go-to price checker, just one of the top 100 highest valued cryptocurrencies isnt in the red over the past 24 hours. Thats Tether. Its a far cry from when bitcoin hit a record of close to $20,000 exactly a month ago on December 16. Despite the drop, Ethereum, Ripple and the rest of the alt coins have largely fared worse than bitcoin. Finally, a little green ink at number 25 Like all things crypto price related, it isnt clear what is driving the changes. A Bloomberg report yesterday suggested that China is preparing to block domestic internet users accessing international bitcoin exchanges. The country banned Chinese exchanges and ICOs last year. Last week, it emerged that the central government is working to drive out Chinas bitcoin miners, who are thought to account for the majority on the planet. Many of the bigger names are already expanding overseas in preparation but the news jolted the market. Theres also been plenty of speculation around Koreas plans to regulate crypto, although the government has since clarified it doesnt plan an all-out ban on bitcoin and crypto trading. Crypto being crypto, there are some alternative theories, too. Weve been here before, of course the headline to this story may seem familiar. The crypto market suffered Continue reading >>

Learn To Code On Ethereum With Cryptozombies

Learn To Code On Ethereum With Cryptozombies

Learn to code on Ethereum with CryptoZombies The popularity of CryptoKitties has demonstrated that decentralised applications can attract mainstream attention. Built on Ethereum, CryptoKitties saw thousands of players using cryptocurrency to purchase, trade, and breed digital cats. All of the games logic was implemented on the Ethereum blockchain, with the website and its server only providing a user interface for the game. The interest and activity this game brought to Ethereum prompted a team of developers at Loom Network to create a new online learning tool called CryptoZombies. CryptoZombies is a free, interactive resource which teaches developers how to create and implement games on the Ethereum blockchain. Ethereums smart contracts are written in Solidity, a programming language designed for the blockchain. CryptoZombies aims to teach developers the basics of Solidity through a series of interactive lessons. CryptoZombies walks users through the process of creating a CryptoKitties-like game one lesson at a time, with each lesson focusing on different aspects of Solidity and other skills required for blockchain development. Users do not require any prior knowledge of Solidity to work through the material, although a basic understanding of programming and blockchain technology is helpful. Loom Network plans to release new lessons to the CryptoZombies platform every week, and users can earn achievements and collectible stickers by completing lessons. All lessons and Solidity coding take place in the platforms browser window, and all lessons on the platform are free. Loom Network aims to build a platform for running decentralised applications on Ethereum side-chains, including decentralised games on the scale of StarCraft. Games are one of the areas where we think bl Continue reading >>

Ece 398 Sc: Smart Contracts And Blockchain Security, Spring 2018 (2nd Half)

Ece 398 Sc: Smart Contracts And Blockchain Security, Spring 2018 (2nd Half)

Programming Project (Solidity Auction House) (40% of grade) This course will center around a programming project, which involves building several variations of secure auction applications using smart contracts written in Solidity. Quizzes and short programming assignments (30% of grade) The final exam is intended to assess your understanding of the conceptual material presented in class and to check that you completed the programming project and programming quizzes. Attendance / Participation (10% of grade) Occasionally throughout the course you'll need to respond to some challenge related to the MPs (i.e., generate a key pair and post your public key in Piazza). Points for these tasks will be folded in to the MP. "The faculty of the Department of Electrical and Computer Engineering expects all students to maintain academic integrity at all times in the classroom and the research laboratory and to conduct their academic work in accordance with the highest ethical standards of the engineering profession. Students are expected to maintain academic integrity by refraining from academic dishonesty, and by refraining from conduct which aids others in academic dishonesty or which leads to suspicion of academic dishonesty. Violations of academic integrity will result in disciplinary actions ranging from failing grades on assignments and courses to probation, suspension or dismissal from the University." This course is partially about computer security. As such, we will discuss several attack techniques and scenarios from the point of view of an attacker. Is it unethical for you to use such techniques to compromise the security of others. This course is also partially about virtual currency. This is a rapidly evolving area where laws, regulations, and policies apply. The assig Continue reading >>

Ether | Definition Of Ether By Merriam-webster

Ether | Definition Of Ether By Merriam-webster

1 a : the rarefied element formerly believed to fill the upper regions of space 2 a : a light volatile flammable liquid C4H10O used chiefly as a solvent and especially formerly as an anesthetic b : any of a class of organic compounds characterized by an oxygen atom attached to two carbon atoms 3 a or less commonly aether play \-thr\ : a medium that in the wave theory of light permeates all space and transmits transverse waves Continue reading >>

Ethereum: What Is It And Whats It Worth?

Ethereum: What Is It And Whats It Worth?

Ethereum: what is it and whats it worth? John Phillips/Getty Images for TechCrunch Ethereums 24-year-old Russian founderVitalik Buterin Cryptocurrency investors have over a thousand digital coins to choose from in todays market but only a select few consistently find themselves at the top of the pile. One of those virtual currencies is Ethereum, which has been playing second fiddle to bitcoin since joining the market in 2015. The cryptocurrency was one of the standout digital tokens at the start of the year, says The Daily Telegraph , after it jumped from a value of around 340 per coin in December to over 1000 in mid-January. Prices have since tumbled due to a number of policy changes, such as South Koreas ban on anonymous cryptocurrency exchanges in February, but Ethereum is still the second most valuable virtual coin in existence. Here are some key facts about bitcoins closest competitor: Much like bitcoin and other digital currencies, Ethereum is a virtual coin that allows for anonymous transactions online. The cryptocurrency was created by the Russian-born programmer Vitalik Buterin in 2013, when he was just 19 years old, says Wired , and was listed on public exchanges two years later. Buterinestablished Ethereum as an open-source alternative to bitcoin, meaning that third parties could use the technology for stocks, bonds or even deeds to houses. The cryptocurrency is decentralised, says Digital Trends , meaning the digital tokes commonly referred to as Ether arent held or regulated by a single company or bank. Instead, Ethereum tokens can be purchased, stored and used for anonymous transactions by the individual. Ethereum is based on blockchain technology, an anonymous online list that logs all the cryptocurrencys digital coins in existence and who owns them. The Continue reading >>

The Thief Who Stole $50 Million In Ether Can't Spend His Money

The Thief Who Stole $50 Million In Ether Can't Spend His Money

The Thief Who Stole $50 Million In Ether Can't Spend His Money Will the hacker or hackers behind a huge heist be able to spend their bounty? Imagine that you are a master thief, a real Danny Ocean. In your latest caper, you discover a way into the vault of a brand-new bank, one thought to be pretty much uncrackable. And then, using the bank's own state-of-the-art systems against it, you steal about $60 million dollars. Finally, you escape and no one knows who you are. But there's a problem: The money you stole has to sit in escrow for a month. So you can't celebrate with a dinner at the French Laundry. Also, by the time you leave the vault, everyone knows that you stole the money and that it's in escrow so they have 27 days to figure out a way to keep you from getting it, laundering it, and spending it. This is basically what happened earlier this month when a hacker or hackers siphoned about a third of the money out of a state-of-the-art online investment fund called the DAO. Investors buy into the DAO short for decentralized autonomous organization with a year-old cryptocurrency called ether. At the time of the hack, the DAO had raised over $150 million worth of the stuff, which amounts to 15% of all ether in existence. Over the course of several hours on June 16 and 17, the hacker stole about 3.7 million Ethereum tokens from the fund. That's a large enough chunk of the total amount of ether to cause panic, and the price of the currency fell more than a quarter. Even after that crash, as of this writing, the purloined ether are still worth about $50 million. The tricky part is, there is no way to directly withdraw from the DAO. Instead, to cash out, you have to create a so-called child DAO, a kind of escrow from which no ether can be extracted for 27 days. That gives Continue reading >>

Twenty Questions To Test Your Bitcoin Knowledge. Beginner Level.

Twenty Questions To Test Your Bitcoin Knowledge. Beginner Level.

How does your bitcoin knowledge rank? Here are Twenty Test Questions to evaluate yourself. This is the first part of a three-part series that will test your knowledge of bitcoin greatness. This quiz will provide you a general measuring stick to gauge where you fit in the range of bitcoin knowledge. We trust you will take this quiz with the honor code. This means that if you dont know the answer, you can honorably feel free to look up the answers anywhere on the web. While you are there, scroll up and down a page to see what other information you can gain by accident. Once you are done with all your research take the quiz again with your books closed and your web searches off. Keep doing this until you get 18 questions correctly or better. Passing the beginner level test with a score of at least 90% (18 correct) means you might know just enough to be dangerous. But then you can brag to your friends you passed the first level and can proudly hold the title of a Bitcoin Magazine Beginner. Just passing this test, doesnt indicate you are ready to make bitcoin investments yet. The answers will appear tomorrow for those who dont need to do the searches for answers. Level 0 Newbie: You barely know how to spell bitcoin. We all have to start somewhere. This is where it all begins. Level 1- Beginner: You scored of at least 18 correct on the first quiz. Dont get cocky This doesnt mean you are ready to invest in bitcoin yet. Level 2 Intermediate: If you can get 90% score on the intermediate level quiz, you might know enough to put a few bucks into investing in bitcoin. Level 3 Expert: A score of 90% on the advanced quiz means you might know enough to start teaching others about bitcoin. Get active, start a Meetup group in your community. Start your own bitcoin blog. Begin programmi Continue reading >>

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