Contentssubmitted by D-platform to u/D-platform [link] [comments]
Proof of Work (commonly abbreviated to PoW) is a mechanism for preventing double-spends. Most major cryptocurrencies use this as their consensus algorithm. That’s just what we call a method for securing the cryptocurrency’s ledger.
Proof of Work was the first consensus algorithm to surface, and, to date, remains the dominant one. It was introduced by Satoshi Nakamoto in the 2008 Bitcoin white paper, but the technology itself was conceived long before then.
Adam Back’s HashCash is an early example of a Proof of Work algorithm in the pre-cryptocurrency days. By requiring senders to perform a small amount of computing before sending an email, receivers could mitigate spam. This computation would cost virtually nothing to a legitimate sender, but quickly add up for someone sending emails en masse.
What is a double-spend?A double-spend occurs when the same funds are spent more than once. The term is used almost exclusively in the context of digital money — after all, you’d have a hard time spending the same physical cash twice. When you pay for a coffee today, you hand cash over to a cashier who probably locks it in a register. You can’t go to the coffee shop across the road and pay for another coffee with the same bill.
In digital cash schemes, there’s the possibility that you could. You’ve surely duplicated a computer file before — you just copy and paste it. You can email the same file to ten, twenty, fifty people.
Since digital money is just data, you need to prevent people from copying and spending the same units in different places. Otherwise, your currency will collapse in no time.
For a more in-depth look at double-spending, check out Double Spending Explained.
Why is Proof of Work necessary?If you’ve read our guide to blockchain technology, you’ll know that users broadcast transactions to the network. Those transactions aren’t immediately considered valid, though. That only happens when they get added to the blockchain.
The blockchain is a big database that every user can see, so they can check if funds have been spent before. Picture it like this: you and three friends have a notepad. Anytime one of you wants to make a transfer of whatever units you’re using, you write it down — Alice pays Bob five units, Bob pays Carol two units, etc.
There’s another intricacy here — each time you make a transaction, you refer to the transaction where the funds came from. So, if Bob was paying Carol with two units, the entry would actually look like the following: Bob pays Carol two units from this earlier transaction with Alice.
Now, we have a way to track the units. If Bob tries to make another transaction using the same units he just sent to Carol, everyone will know immediately. The group won’t allow the transaction to be added to the notepad.
Now, this might work well in a small group. Everyone knows each other, so they’ll probably agree on which of the friends should add transactions to the notepad. What if we want a group of 10,000 participants? The notepad idea doesn’t scale well, because nobody wants to trust a stranger to manage it.
This is where Proof of Work comes in. It ensures that users aren’t spending money that they don’t have the right to spend. By using a combination of game theory and cryptography, a PoW algorithm enables anyone to update the blockchain according to the rules of the system.
How does PoW work?Our notepad above is the blockchain. But we don’t add transactions one by one — instead, we lump them into blocks. We announce the transactions to the network, then users creating a block will include them in a candidate block. The transactions will only be considered valid once their candidate block becomes a confirmed block, meaning that it has been added to the blockchain.
Appending a block isn’t cheap, however. Proof of Work requires that a miner (the user creating the block) uses up some of their own resources for the privilege. That resource is computing power, which is used to hash the block’s data until a solution to a puzzle is found.
Hashing the block’s data means that you pass it through a hashing function to generate a block hash. The block hash works like a “fingerprint” — it’s an identity for your input data and is unique to each block.
It’s virtually impossible to reverse a block hash to get the input data. Knowing an input, however, it’s trivial for you to confirm that the hash is correct. You just have to submit the input through the function and check if the output is the same.
In Proof of Work, you must provide data whose hash matches certain conditions. But you don’t know how to get there. Your only option is to pass your data through a hash function and to check if it matches the conditions. If it doesn’t, you’ll have to change your data slightly to get a different hash. Changing even one character in your data will result in a totally different result, so there’s no way of predicting what an output might be.
As a result, if you want to create a block, you’re playing a guessing game. You typically take information on all of the transactions that you want to add and some other important data, then hash it all together. But since your dataset won’t change, you need to add a piece of information that is variable. Otherwise, you would always get the same hash as output. This variable data is what we call a nonce. It’s a number that you’ll change with every attempt, so you’re getting a different hash every time. And this is what we call mining.
Summing up, mining is the process of gathering blockchain data and hashing it along with a nonce until you find a particular hash. If you find a hash that satisfies the conditions set out by the protocol, you get the right to broadcast the new block to the network. At this point, the other participants of the network update their blockchains to include the new block.
For major cryptocurrencies today, the conditions are incredibly challenging to satisfy. The higher the hash rate on the network, the more difficult it is to find a valid hash. This is done to ensure that blocks aren’t found too quickly.
As you can imagine, trying to guess massive amounts of hashes can be costly on your computer. You’re wasting computational cycles and electricity. But the protocol will reward you with cryptocurrency if you find a valid hash.
Let’s recap what we know so far:
That’s where public-key cryptography comes in. We won’t go into depth in this article, but check out What is Public-Key Cryptography? for a comprehensive look at it. In short, we use some neat cryptographic tricks that allow any user to verify whether someone has a right to move the funds they’re attempting to spend.
When you create a transaction, you sign it. Anyone on the network can compare your signature with your public key, and check whether they match. They’ll also check if you can actually spend your funds and that the sum of your inputs is higher than the sum of your outputs (i.e., that you’re not spending more than you have).
Any block that includes an invalid transaction will be automatically rejected by the network. It’s expensive for you to even attempt to cheat. You’ll waste your own resources without any reward.
Therein lies the beauty of Proof of Work: it makes it expensive to cheat, but profitable to act honestly. Any rational miner will be seeking ROI, so they can be expected to behave in a way that guarantees revenue.
Proof of Work vs. Proof of StakeThere are many consensus algorithms, but one of the most highly-anticipated ones is Proof of Stake (PoS). The concept dates back to 2011, and has been implemented in some smaller protocols. But it has yet to see adoption in any of the big blockchains.
In Proof of Stake systems, miners are replaced with validators. There’s no mining involved and no race to guess hashes. Instead, users are randomly selected — if they’re picked, they must propose (or “forge”) a block. If the block is valid, they’ll receive a reward made up of the fees from the block’s transactions.
Not just any user can be selected, though — the protocol chooses them based on a number of factors. To be eligible, participants must lock up a stake, which is a predetermined amount of the blockchain’s native currency. The stake works like bail: just as defendants put up a large sum of money to disincentivize them from skipping trial, validators lock up a stake to disincentivize cheating. If they act dishonestly, their stake (or a portion of it) will be taken.
Proof of Stake does have some benefits over Proof of Work. The most notable one is the smaller carbon footprint — since there’s no need for high-powered mining farms in PoS, the electricity consumed is only a fraction of that consumed in PoW.
That said, it has nowhere near the track record of PoW. Although it could be perceived as wasteful, mining is the only consensus algorithm that’s proven itself at scale. In just over a decade, it has secured trillions of dollars worth of transactions. To say with certainty whether PoS can rival its security, staking needs to be properly tested in the wild.
Closing thoughtsProof of Work was the original solution to the double-spend problem and has proven to be reliable and secure. Bitcoin proved that we don’t need centralized entities to prevent the same funds from being spent twice. With clever use of cryptography, hash functions, and game theory, participants in a decentralized environment can agree on the state of a financial database.
|Rate (per day)||107.80||1494.28|
Generated with BBoe's Subreddit Stats
Pictures of “Technical Preplan on Blocking Bitcoin overseas Transaction” were circulated in Wechat group and later posted on weibo around 18pm 16 September. The document describes the preplan of blocking bitcoin exchanges and Bitcoin blockchain data-syncing, along with a list of overseas exchanges. The news caused panic sell, a daily low of 16,661 was observed on OKCoin around that time ... You already had the chance to see how Bitcoin miners take their “job” seriously in this post, when we wrote about the Frankenstein-like computers experts and amateurs were building in order to create digital currency.. If you still had any doubt about their commitment to the mining career, the next pictures will show you that they’re here to stay. Click the large blue Download Bitcoin Core button to download the Bitcoin Core installer to your Downloads folder. Optional: Verify the release signatures. If you know how to use PGP, you should also click the Verify Release Signatures link on the download page to download a signed list of SHA256 file hashes. The 0.11 and later releases are signed by Wladimir J. van der Laan’s releases key w First called MegaBigPower, a simple mining farm with just a single rig - the farm has now grown exponentially in size to become America’s largest Bitcoin mining farm! Carlson has earned millions from mining and has invested a good portion of that back into the business. He did this in 12 months! Carlson has also begun selling mining equipment to those interested in mining. People say that mining can’t be done on a home computer but that’s not entirely true. Any computer can be used to mine Bitcoins, Here's how. The Bitcoin.com mining pool has the lowest share reject rate (0.15%) we've ever seen. Other pools have over 0.30% rejected shares. Furthermore, the Bitcoin.com pool has a super responsive and reliable support team. BENGALURU — India’s ICICI Bank Ltd has begun utilizing satellite tv for pc pictures of farmland to assist assess farmers’ credit-worthiness, a transfer the bank says helps lower journey prices and make sooner lending choices in a world hit by the COVID-19 pandemic.The lender, India’s fourth largest by property, is utilizing photos taken from house and analysed by a third-party agency ... Users will be able to stake their tokens in three separate pools to farm – earn profits by providing staked liquidity – BEL tokens over a 30 day period starting Wednesday. A week later, on Sept. 16, Binance will list BEL for trading and open trading pairs on its exchange for BEL/BTC, BEL/BNB, BEL/BUSD and BEL/USDT. Any electronic flaw (which could happen with ageing and intensive use) that results in a small fire could spread to your entire farm like this! Small electric problems can, and do, happen in miners! Google Cowboy Miner's facility in Thailand if you are not convinced! Other than that - thanks for sharing these pictures. I love to see how people ... 08.12.2017 - Entdecke die Pinnwand „Mineworxx Bitcoin Mining“ von patrickhorn86. Dieser Pinnwand folgen 8654 Nutzer auf Pinterest. Weitere Ideen zu Neue wege, Bitcoin logo, Native advertising.
[index]          
Bigger Bitcoin, BTC Donations, Binance Trading Pairs & LTC Giveaway The Modern Investor. Loading... Unsubscribe from The Modern Investor? Cancel Unsubscribe. Working... Subscribe Subscribed ... Send Your Mining Rig Pics in Discord to be featured in upcoming Community Mining Rigs Episodes/Live Streams! ... "The Bitcoin Standard ": https://geni.us/NH5spNd Donation Addresses! Always ... My Second Channel: https://www.youtube.com/channel/UCvXjP6h0_4CSBPVgHqfO-UA ----- Supp... SUBSCRIBE TO CHANNEL NOW - http://fuk.io/yt - CLICK HERE TO SUBSCRIBE #bitcoin #yieldfarming #binance http://fuk.io/coinex share 10 000 USDT with new account... Amazon Affiliate Link - (If You Buy Something On Amazon, I Get A Small Commission As A Way To Support The Channel) - (There is NO extra cost for you) https://amzn.to/39MXp4q ----- My Second ... My Second Channel: https://www.youtube.com/channel/UCvXjP6h0_4CSBPVgHqfO-UA ----- Supp... Buy Bitcoin, Economic Turmoil, Binance US Listing 30 Coins & Massive Bitcoin Mining Farm - Duration: 43:03. The Modern Investor 27,708 views. 43:03 . How Much Ether Do You Need?, China Crypto ... Amazon Affiliate Link - (If You Buy Something On Amazon, I Get A Small Commission As A Way To Support The Channel) - (There is NO extra cost for you) https://amzn.to/39MXp4q Computer I Use To ... My Second Channel: https://www.youtube.com/channel/UCvXjP6h0_4CSBPVgHqfO-UA ----- Supp... Support Me On Patreon! https://www.patreon.com/TheModernInvestor ----- Protect And Sto...