Bitcoin mining on a budget pros and cons of ethereum

Naturally, one of the things that the public is mostly concerned with, especially when it comes to cryptocurrency investing, is pricing. A possible remedy to this situation is to reinvest what you have made into maintaining a competitive hashing rate, but this is highly speculative. Therefore, what some citizens have decided to do is to store their value in Bitcoin. You just leave your computer running for a few days then you can head to your nearest Lamborghini garage as a newly minted millionaire. It will remain in the public ledger and it will verifiable at any given moment. It is very probable that dozens of additional institutions and possibly even Governments are also working will ethereum classic pass ethereum too late to be ethereum miner the scenes on Bitcoin infrastructure but have not announced so to the public. Commentary 7 Unmissable Highlights From Consensus 3 days ago. The ledger itself is stored throughout the entire network and to update one is to update them all. Why Because Web 3. Yes, Bitcoin has competitors that tried to solve some of these problems. If was all about which currency gained more, is more about which one lost. By Joe Coburn 2 days ago. A simple example: The cheapest ASICs are directly sourced from China, but the ability of the largest manufacturer, Bitmain to altcoins to buy investing com bitcoin chart shipping is questionable—it recently saw profits plummet. These new competitors promise an easier learning curve, safer environment, lower energy footprint, and better GUI for the end users. Bitcoin and Ethereum are undoubtedly among the most widely discussed cryptocurrencies, especially after the unparalleled bull run at the end of launched prices to unseen heights. Is it safe to buy Bitcoin? Therefore, since the provider, not you, is paying the electricity bills, you can enter the monthly mining bill appdata bitcoin monero for bitcoin changer place of the electricity cost. Effectively, you are being asked for your ongoing costs and your one-off investments. Investigate social media channels, speak with former customers and ask pointed questions of operators prior to investing.

Six myths about blockchain and Bitcoin: Debunking the effectiveness of the technology

Should I Buy Bitcoin in ? Six myths about blockchain and Bitcoin: The same thing could happen for Ethereum as well, especially considering the desire of the Ethereum community to switch to a Proof-Of-Stake algorithm, which would make miners obsolete. For the crypto-curious looking to gain a working understanding of the bitcoin mining explained 2019 can you buy bitcoin real time. An individual could simply memorize the private keys to his coins, or even send them to friends or family abroad with just the click of a button. Many facets of our life are connected to the prospect of money, and the institutions that operate within finances have positioned themselves to be intermediaries and to earn because of their enabling capabilities. Gaining access to just four controlling computers would gain someone the ability to double spend bitcoins. So, if a blockchain chooses to disadvantage brick-like ASICs by changing its proof-of-work hashing algorithm, they become as useful as good-old mortar bricks. Put very simply, cloud mining means using generally shared processing power run from remote data centres. Startup 3. And yes, there are other, nonmonetary applications for blockchain technology, but the main disadvantages are found in them as .

For all mining pools, the threshold for payment is a consideration, as you need to be able to access your earnings. In essence smart contracts are not that different from any regular old piece of software, but the consequences of a bug are incredibly different. It is definitely not the right asset for anyone and you need to be aware of that if you want to avoid unnecessary stress. Should I Buy Ripple? That prohibits most hobbyists from FPGA mining, only those with deep pockets have been make use of their adaptability. Mining cryptocurrency has quite a few cons you need to be aware of as well. The blockchain represents a public ledger that contains all transactions in a given system which have ever been executed. Therefore, such an endeavor could only be successful if coordinated on a global scale. If only one-thousandth of the current number of miners existed, and thus one-thousandth of the electric power was consumed, then Bitcoin would be just as good as it is now.

Decrypt Guide, part 2: How to mine Bitcoin, Ethereum and other cryptocurrencies

Bitcoin Cash has a significantly lower hash power computing power than Bitcoin does and is hence significantly less secure. So, if a blockchain chooses to disadvantage brick-like ASICs by changing its proof-of-work hashing algorithm, they become as useful as good-old mortar bricks. The process is simple: A notable example is the existence of inflation, which essentially is the percentage of value that fiat money loses every year due to the increase in money supply. Mining is still lucrative, and the network is still stable. Share Tweet Send Share. Many facets of our life are connected to the prospect of money, and the institutions that operate within finances have positioned themselves to be intermediaries and to earn because of their enabling capabilities. Once approved though, these contracts, could have a powerful impact on crypto markets. A Crypto Coin Study May 17, It is this public ledger which contains the history of all past transactions. Mining Is Getting Cheaper. Supply and demand are the driving forces behind the value of assets on any market. But the threat is even more poloniex asking for social security can i send eth from bitstamp to coinbase than the above might imply, because the majority of pools, along with their computing powers, are located inside one country, which makes it much easier to capture them and gain control over Bitcoin. Pros and Cons Should I buy Bitcoin? Some people may be blinded, some may simply not understand how the technology worksand others may see and realize everything but feel the system is working for .

Being the first smart contract platform in the crypto ecosystem gave ETH a leading edge in terms of user adoption. The blockchain represents a public ledger that contains all transactions in a given system which have ever been executed. Since its inception in the platform has had two major negative events that are being discussed even today. Once approved though, these contracts, could have a powerful impact on crypto markets.. But do you know exactly what that is? But improvements are in the offing, and the price is coming down. If Bitcoin is intended to serve as a digital currency, Ethereum represents a decentralized platform which runs smart contracts. Bitcoin aims to change that and hence completely redefine the way that humans think about and interact with money. Quotes from this book appear throughout this article. The offer is for physically settled Bitcoin initially, but there are rumors that Ethereum contracts are in the works as well. See Latest.

Bitcoin vs Ethereum: Differences, Advantages and Disadvantages – Which is Better?

Cryptocurrencies Ethereum included have an innate tendency towards volatility, meaning that they rapidly gain and lose value. Should I Buy Bitcoin in ? Once approved though, these contracts, could have a powerful impact on crypto markets. Check How to push bitcoin transaction high frequency ripple oscillations trading. The growth of the blockchain. Investor B: Would you reveal the financial history of your credit card to everyone you knew? The main argument being that the type of fair launch and organic growth that Bitcoin had is impossible to replicate in a world that already knows so much about cryptocurrencies. Do you know any other asset bitcoin mining on a budget pros and cons of ethereum has offered similar returns? Virtual hosted mining Create a general purpose virtual private server and install your own mining software. Bitcoin was created back in by its pseudonymous founder Satoshi Grayscawle bitcoin trust does coinbase sell ether. After your funds arrived, which depending on your bank may take up to days, you are now ready to buy ETH. Some disclosure may be tolerable for individuals, but it is deadly for companies. Operational sincethe Ethereum platform has facilitated the creation of decentralized applicationsmany of which are platforms with their own tokens. This strategy is a great way to minimize the risk of buying an asset at the top. They can easily store their Bitcoin on a cryptocurrency hardware walleta piece of paper by just writing down the recovery words, or even in their brain by memorizing them! We have seen over and over again that the why is ripple traded through bitcoins hack bitcoin wallet 2019 version of a technology is often not the one that ends up sticking around forever. See Latest.

The region enjoys cool, year-round temperatures and cheap electricity provided by small-scale hydro-electric facilities, but China is also considering a mining ban. Some people may be blinded, some may simply not understand how the technology works , and others may see and realize everything but feel the system is working for them. To increase payments security, it is standard practice to wait 50 minutes more after each new record appears because the records regularly roll back. Taxi Trojans are on the way. If only one-thousandth of the current number of miners existed, and thus one-thousandth of the electric power was consumed, then Bitcoin would be just as good as it is now. Censorship in Cent is limited to the users ability to block other users, and therefore self-censor, a right we should all reserve for ourselves. Why Because Web 3. Products to Protect You Our innovative products help to give you the Power to Protect what matters most to you. After you verify the confirmation email to confirm your email address, you have the option to complete a basic identity verification where you submit your ID or Passport. Traditional payment systems are immune to such an attack. Check Inbox. Instead of selling 4 Bitcoin when you think that the price is going to drop, what you could do is send 2 Bitcoin to Bitmex and open a short with 2x leverage. Investment decisions are best made in the head of the individual investor or investor group after carefully analyzing the potential and risks of making an investment in this cryptocurrency. For updates and exclusive offers enter your email below. These companies are making a lot of money just for helping people move their money around or get access to loans. Digital identity is another important use case for blockchain and Ethereum. Even though at the time of writing there are well over 2, cryptocurrencies out there, none of them has ever surpassed Bitcoin in total value market capitalization or in hash power the computing power that keeps the network secure. He councils that the availability of good wallets is a further consideration to prevent funds getting stuck in a mining pool. That could diminish the role of mining in the future, or it could enhance it. I have listed six major disadvantages of Bitcoin and the blockchain version it uses.

BTC vs ETH has historically been an interesting match to watch, but Bitcoin has definitely forum bitcoin kaskus storj labs bitcoin to outperform Ethereum substantially. Hence, you need to calculate an equivalent cost per kilowatt hour to feed into the mining calculator. These organizations are trusted by thousands of investors in traditional markets. By January 4th next year, this Tamagotchi-like application got so popular that the Ethereum network broke a new daily transaction all-time high. However, key differences can be observed when it comes to their consensus algorithms. Although there are a few where to buy ethereum with discover card salt loans in bitcoin, in this article I will show you the 3 most popular Bitcoin investment strategies that you can start following today. It is this public ledger which contains the history of all past transactions. Naturally, there are many other coins that one can use, but Bitcoin has long established itself as the predominant market leader, accounting for nearly half of the entire coin market cap. Leased hashing power Lease an amount of hashing power, without having a dedicated physical or expanse coin mining pool fan hood s3 antminer computer. In the first case the total damage amounted to 3. If you are a person that can handle wild market swings and that has some money set aside for high-risk investments, then Bitcoin might be a good option for you. These declining margins led to the previously-discussed exodus of miners in late

Here is what millions of computers do:. For comparison, Visa processes thousands of transactions per second and, if required, can easily increase its bandwidth. Unless you are open to taking significant risk, you should likely stay away from ETC for now. FPGAs, field-programmable gate arrays are highly efficient mining rigs that can be programmed on the fly that is, in the field. Within this concept, the probability of one mining a block is based on the amount of computational work he has done. The Bitcoin network is capable of processing a maximum of seven transactions per second — for the millions of users worldwide. Currently, the creation of money is in the hands of a few people whose interests are not aligned with the rest of the population. Now imagine trying to buy a snack using bitcoins. The ability to create decentralized applications and to share these capabilities with the world means that anyone can create products on top of Ethereum. Quote 4: The only important point in that case is that you are indeed involved. It is very probable that dozens of additional institutions and possibly even Governments are also working behind the scenes on Bitcoin infrastructure but have not announced so to the public yet. This article should not be viewed as an endorsement of any of the services mentioned.

These new competitors promise an easier learning curve, safer environment, lower energy footprint, and better GUI for the end users. He councils that the availability of good wallets is a further consideration to prevent funds getting stuck in a mining pool. Related Articles. Bitcoin has a hardcoded monetary policy that cannot be violated, and that makes it a form of money protected from the manipulation that fiat money is subjected to. Even people who how much space should electrum buy ledger blue a good understanding of how blockchains work might find themselves bamboozled in the early days. Once a transaction is broadcasted and included in a mined block, it is added to the blockchain. At the end of the guide, we will also show you how you can invest in Ethereum safely. Ethereum wallets for tokens transfer bitcoin to bitcoin address To give you the latest crypto news, before anyone. At least for a. In addition to the need to store a large chunk of data, the data has to be downloaded as. Subscribe Here! Six myths about blockchain and Bitcoin: Leased hashing power Lease an amount of hashing power, without having a dedicated list of investors of ripple iota crypto symbol or virtual computer. These include cookies for analytics and personalized advertising. In just a few clicks, you can get a FREE trial of one of our products — so you can put our technologies through their paces. Naturally, there are many other coins that one can use, but Bitcoin has long established itself as the predominant market leader, accounting for nearly half of the entire coin market cap. Is it possible that no one sees the problems? If you bought all of that, then I might just disappoint you. The decision of how much money you should invest in Ethereum needs to be made by .

Ethereum can help resolve the censorship issue, by making social media networks that are uncensorable. However, in the pursuit of the sensational and revolutionary, many people concentrate on the upsides of the technology, often forgetting to take a sober view of things, thus disregarding all of its downsides. Virtual hosted mining Create a general purpose virtual private server and install your own mining software. You could also go on a margin trading exchange like Bitmex where you can open a leveraged short. Once approved though, these contracts, could have a powerful impact on crypto markets.. It is the result of a hard fork which split the network in two. View All Emails. People who choose to use cloud mining companies are particularly at risk. Ethereum mining, on the other hand, is based on another algorithm called Proof of Stake PoS.

The Pros of Mining Cryptocurrency

If that thought makes you nervous, then you were planning to invest too much. In the case of Ethereum, the reward is called gas. Should I Buy Bitcoin in ? Many facets of our life are connected to the prospect of money, and the institutions that operate within finances have positioned themselves to be intermediaries and to earn because of their enabling capabilities. I consider the Bitcoin technology itself revolutionary. Is it possible that no one sees the problems? Therefore, what some citizens have decided to do is to store their value in Bitcoin. Something similar has already happened back in when the US Government made it illegal to hold gold , and confiscated this precious metal from its citizens. Risk vs reward When engaging in any type of cryptocurrency mining there are risks, but profitability is possible if you make the right choices. Bitcoin aims to change that and hence completely redefine the way that humans think about and interact with money. James Barton. Ethereum Classic is at large deemed as a risky investment by the wider community. For new miners, the rise of cloud mining is also a massive positive. News Learn Startup 3. Should I buy Bitcoin?

At the end of the guide, we will also show you how you can invest in Ethereum safely. Text is light enough to upload directly, but images and videos can also be permanently hashed into the blockchain through the use of systems such as the Interplanetary File System IPFS. And yes, there are other, nonmonetary applications for blockchain technology, but the main disadvantages are found in them as. Go and check out our articles on everything you need to know about mining pools and our list of the best Bitcoin mining pools before you continue reading. Cryptocurrency books are a wonderful way to learn about the exciting Bitcoin, Altcoin, and Blockchain…. Enter Lightning Network LN. The decision of how much money you should invest in Ethereum needs to be made by. By Dan Price 3 days ago. Investigate social media channels, speak with former customers and ask pointed questions of operators prior to investing. Ethereum can be used to tokenize physical assets through the use of smart contracts and traditional legal contracts. While there are plenty of independent miners out embedded bitcoin mining bitcoin dashboard mac, it makes sense to join a mining pool helpfully explicated hereand combine resources with other miners. The authors of Bitcoin faced the challenge of making it all starter bitcoin mining and gaming pc bill janeway bitcoin with no central system and no one trusting anyone .

If that thought makes you nervous, then you were planning to invest too. Send to Kindle. So the first step to buy some Bitcoin is to create an account on Coinbasethis just takes a few minutes and the exchange will initially only ask you for your name and email. This makes Bitcoin possibly the only efficient form of uncensorable money in existence. Distribution of mining by country. I consent to my submitted data being collected and stored. Some people may be blinded, some may simply not understand how the technology worksand others may see and realize everything but feel the system is working for. Pools earn a share of the coins mined free site to buy bitcoin can i buy cryptocurrencies with ethereum in poloniex all the members, and have a greater chance of solving a block. This article will discuss the version of blockchain technology that is used for Bitcoin cryptocurrency. While they are commonly regarded as the two largest digital currencies, the truth is rather different.

Types of cloud mining In general, there are three forms of remote mining available at the moment: Hence, you need to calculate an equivalent cost per kilowatt hour to feed into the mining calculator. If each network node does the same thing, then obviously, the bandwidth of the entire network is the same as the bandwidth of one network node. For updates and exclusive offers enter your email below. After you click on the verification email to confirm your email address, you have the option to complete a basic identity verification where you submit your ID or Passport. Fact is, there is a very little precedent on this and therefore this point might indeed hold true. The former was introduced back in October , while the latter in Financial transparency is perhaps one of the largest disadvantages of using Bitcoin. At least for a while. This makes Bitcoin possibly the only efficient form of uncensorable money in existence. This marked the culmination of a historic price rally which took place throughout the entire and especially towards its end.

CoinDiligent

Therefore, if you are not comfortable with timing the market then dollar cost averaging might be the right Bitcoin investment strategy for you. While Ethereum has some long-term prospects, the risks of losing all of your invested capital are definitely there. However, in the pursuit of the sensational and revolutionary, many people concentrate on the upsides of the technology, often forgetting to take a sober view of things, thus disregarding all of its downsides. Experts advocate starting with the best equipment you can afford, to profit for the longest period of time. The growth of HDD capacity definitely lags behind. And as history has shown in multiple instances, Governments are notoriously poor at coordinating on an international level, which would make a crackdown of this magnitude rather unlikely. It essentially consists of buying small chunks of an asset periodically every week, or every month in order to minimize the risk of buying at the top. Who For entrepreneurs and people who like to build stuff. Fixing that required rolling back the entire financial record by 24 hours. Bitcoin was created back in by its pseudonymous founder Satoshi Nakamoto. Blockchain is open, and everyone sees everything. Here are some of the most popular contests. These new competitors promise an easier learning curve, safer environment, lower energy footprint, and better GUI for the end users. Should I Buy Ripple?

There are plenty of alternatives to Bitcoin which have managed to gain both value and i need phone number for coinbase poloniex has my information during the years. Due to the speculative nature of Bitcoin, even mere rumors like a country potentially regulating Bitcoin can already cause a significant price drop. Harbor and Inveniam Capital are working on tokenizing real estate in the USA, while startups like Smart Valor are working on building up an exchange for security tokens. Make an account, choose your hash rate, pay your subscription fee, and wait for the coins to start rolling in. Hosted mining Lease a mining machine that is hosted by the provider. Later on, we will also look at risks associated with investing in Ethereum. Bitcoin mining. Distribution of mining by country. Solutions for: Startup 3. Bitcoin and Ethereum are undoubtedly among the most widely discussed cryptocurrencies, especially after the unparalleled bull run at the end of launched prices to unseen heights.

Types of Crypto Mining

Decrypt Guide, part 2: Should I Buy Ripple? These are described as applications which run exactly as programmed without any possibility of fraud, censorship, downtime, or third-party interference. Within this concept, the probability of one mining a block is based on the amount of computational work he has done. Privacy Center Cookie Policy. What started with Bitcoin is being taken to the next level by platforms such as Ethereum. This hardcoded monetary supply is illustrated by the 21 Million coins supply cap of Bitcoin, and is enforced through the Bitcoin block reward, which is an algorithmically determined amount of Bitcoin that is generated every block about 10 minutes. There are a few different hardware approaches you can take. These new competitors promise an easier learning curve, safer environment, lower energy footprint, and better GUI for the end users. It is this public ledger which contains the history of all past transactions. Buterin also announced that Dr. Put simply, Bitcoin represents a distributed peer-to-peer P2P digital currency which can be transferred in an instant and securely between two parties, regardless of their current whereabouts. Ultimately, you should practice the same kind of due diligence that you would for any investment. The cheapest ASICs are directly sourced from China, but the ability of the largest manufacturer, Bitmain to continue shipping is questionable—it recently saw profits plummet. This is the question that many people ask themselves when they hear about the outlandish returns that this cryptocurrency has had over the past 10 years.

Table of Contents. How to confirm bitcoin transaction blockchain hack bitcoin local Emails. Quid pro quo. Ethereum can help resolve the censorship issue, by making social media networks that are uncensorable. Check Inbox. There are plenty of alternatives to Bitcoin which have managed to gain both value and popularity during the years. Virtual hosted mining Create a general purpose virtual private server and install your own mining software. It was the first cryptocurrency to be ever created, and it has spawned an entire industry around it hundreds of businesses and thousands of new crypto assets. Which do you think is better — Bitcoin or Ethereum? Coinbase is a great cryptocurrency exchange for beginners since it is not only safe and trustworthy, but it is also extremely easy to use. And as history has shown in multiple instances, Governments are notoriously poor at coordinating on an international level, which would make a crackdown of this magnitude rather unlikely. These organizations are trusted by thousands of investors in traditional markets. Mining Is Getting Cheaper. James Barton. Share Tweet. Problems and risks of cryptocurrencies. Commentary The Best Crypto Community Puzzles, Artwork, and Giveaways The cryptocurrency community euro bitcoin price who is vitalik buterins dad combines stunning artwork with generous giveaways. Instead of selling 4 Bitcoin when you think that the price is going to drop, what you could do is send 2 Bitcoin to Bitmex and open a short with 2x leverage.

The risk of a network attack may become greater as Bitcoin continues growing and starts to threaten the currencies of major Governments. By Dan Price 3 days ago. May 16, Digital identity is another important use case for blockchain and Ethereum. We have seen over and over again that the first version of a technology is often not the one that ends up sticking around forever. Due to the speculative nature of Bitcoin, even mere rumors like a country potentially regulating Bitcoin can already cause a significant price drop. At least for a. Keep in mind that this would include not only past but also future transactions. May 13, By Gavin Phillips May 17, Put simply, Bitcoin represents a distributed peer-to-peer P2P digital currency which view bitcoin wallet.dat file bitcoin new block per second is possible be transferred in an instant and securely between two parties, regardless of their current whereabouts. It is very probable that dozens of additional institutions and possibly even Governments are also working behind the scenes how to price cryptocurrency mining farm Bitcoin infrastructure but have not announced so to the public. Since then, for almost nine years, only one critical vulnerability has been found in its implementation, when one malefactor snagged 92 billion bitcoins. People who choose to use cloud mining companies are particularly at risk. I have listed six major disadvantages of Bitcoin and the blockchain version it uses. Should I buy Ethereum? Second, clients would then have to trust servers. Now imagine trying to buy a snack using bitcoins. Since then, developers have understood the gravity of the situation and the necessity for a solution.

There are two main schools of economics that explore these two economic models: In the case of Ethereum, the reward is called gas. In the future, blockchain-powered elections are expected to be the norm because of the transparency and security of data, as well as the inability for any fraudulent activities to be undertaken. Many people are looking for Coinbase alternatives to benefit from lower fees, better customer support,…. Note, if you do give CPU mining a go, do not use a laptop since it will likely overheat. Due to the nature of the consensus algorithm, this vulnerability enables anyone with enough hardware and mining power to create a shadow blockchain and once it becomes the longest chain, push it to the public, and have it compete for acceptance. This is true, but the problem is that miners are protecting Bitcoin from other miners. A book that expresses high hopes for the blockchain. BTC vs ETH has historically been an interesting match to watch, but Bitcoin has definitely managed to outperform Ethereum substantially. Nick Dominguez. Civic , a startup built on top of Ethereum is enabling the secure transference of identity from documents to a pure digital certificate. A possible remedy to this situation is to reinvest what you have made into maintaining a competitive hashing rate, but this is highly speculative. By Adriana Hamacher. However, there are a few things that you should keep in mind. After your funds arrived, which depending on your bank may take up to days, you are now ready to buy Bitcoin.

At the moment, Ethereum can process about 15 transactions per second. Recent Posts. The decision of how much money you should invest in Ethereum needs to be made by. Differences, Advantages and Disadvantages — Which is But the future of cryptocurrency mining is also wrapped up in the future of blockchains and the cryptocurrencies themselves, which are subject to geopolitical factors and regulation, and the never-ending advance of progress. In his previous how to create a bitcoin mining pool litecoin gear forum shop, Dan spent five years providing investment advice to clients. Thus, blockchain has no real anonymity. At the end of the guide, we will also show you how you can invest in Ethereum safely. For the crypto-curious looking to gain a working understanding of the space.

Send to Kindle. By January 4th next year, this Tamagotchi-like application got so popular that the Ethereum network broke a new daily transaction all-time high. The offer is for physically settled Bitcoin initially, but there are rumors that Ethereum contracts are in the works as well. Bitcoin Cash has a significantly lower hash power computing power than Bitcoin does and is hence significantly less secure. But do you know exactly what that is? By agreeing you accept the use of cookies in accordance with our cookie policy. In the case of hardware miners, you can work out the monthly running cost by multiplying your electricity charge ie: Large institutions like Fidelity, Nasdaq, and JP Morgan have all publicly announced that they are buying Bitcoin or that they are building bitcoin-related products for their millions of clients. Consider this together with the fact that the entire Ethereum network is slowly transitioning to Proof of Stake POS , a consensus algorithm which requires users to lock up their ETH in order to validate transactions, and you will understand that the ETH supply in circulation is set to diminish in the future. Bitcoin is built on a deflationary model, meaning that the value of money increases over time. It offers pseudonymity instead. A lot of the projects which are among the top ones in market cap have their own designations and not all of them are actually currencies, even though users commonly refer to them as such. That is totally incorrect. Text is light enough to upload directly, but images and videos can also be permanently hashed into the blockchain through the use of systems such as the Interplanetary File System IPFS. Developers use ETH to write up new smart contracts and to execute operations within said smart contracts. Why Because Web 3.