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1. What is Bitcoin (BTC)?
2. Bitcoin’s core featuresFor a more beginner’s introduction to Bitcoin, please visit Binance Academy’s guide to Bitcoin.
Unspent Transaction Output (UTXO) modelA UTXO transaction works like cash payment between two parties: Alice gives money to Bob and receives change (i.e., unspent amount). In comparison, blockchains like Ethereum rely on the account model.
Nakamoto consensusIn the Bitcoin network, anyone can join the network and become a bookkeeping service provider i.e., a validator. All validators are allowed in the race to become the block producer for the next block, yet only the first to complete a computationally heavy task will win. This feature is called Proof of Work (PoW).
The probability of any single validator to finish the task first is equal to the percentage of the total network computation power, or hash power, the validator has. For instance, a validator with 5% of the total network computation power will have a 5% chance of completing the task first, and therefore becoming the next block producer.
Since anyone can join the race, competition is prone to increase. In the early days, Bitcoin mining was mostly done by personal computer CPUs.
As of today, Bitcoin validators, or miners, have opted for dedicated and more powerful devices such as machines based on Application-Specific Integrated Circuit (“ASIC”).
Proof of Work secures the network as block producers must have spent resources external to the network (i.e., money to pay electricity), and can provide proof to other participants that they did so.
With various miners competing for block rewards, it becomes difficult for one single malicious party to gain network majority (defined as more than 51% of the network’s hash power in the Nakamoto consensus mechanism). The ability to rearrange transactions via 51% attacks indicates another feature of the Nakamoto consensus: the finality of transactions is only probabilistic.
Once a block is produced, it is then propagated by the block producer to all other validators to check on the validity of all transactions in that block. The block producer will receive rewards in the network’s native currency (i.e., bitcoin) as all validators approve the block and update their ledgers.
Block productionThe Bitcoin protocol utilizes the Merkle tree data structure in order to organize hashes of numerous individual transactions into each block. This concept is named after Ralph Merkle, who patented it in 1979.
With the use of a Merkle tree, though each block might contain thousands of transactions, it will have the ability to combine all of their hashes and condense them into one, allowing efficient and secure verification of this group of transactions. This single hash called is a Merkle root, which is stored in the Block Header of a block. The Block Header also stores other meta information of a block, such as a hash of the previous Block Header, which enables blocks to be associated in a chain-like structure (hence the name “blockchain”).
An illustration of block production in the Bitcoin Protocol is demonstrated below.
Block time and mining difficultyBlock time is the period required to create the next block in a network. As mentioned above, the node who solves the computationally intensive task will be allowed to produce the next block. Therefore, block time is directly correlated to the amount of time it takes for a node to find a solution to the task. The Bitcoin protocol sets a target block time of 10 minutes, and attempts to achieve this by introducing a variable named mining difficulty.
Mining difficulty refers to how difficult it is for the node to solve the computationally intensive task. If the network sets a high difficulty for the task, while miners have low computational power, which is often referred to as “hashrate”, it would statistically take longer for the nodes to get an answer for the task. If the difficulty is low, but miners have rather strong computational power, statistically, some nodes will be able to solve the task quickly.
Therefore, the 10 minute target block time is achieved by constantly and automatically adjusting the mining difficulty according to how much computational power there is amongst the nodes. The average block time of the network is evaluated after a certain number of blocks, and if it is greater than the expected block time, the difficulty level will decrease; if it is less than the expected block time, the difficulty level will increase.
What are orphan blocks?In a PoW blockchain network, if the block time is too low, it would increase the likelihood of nodes producingorphan blocks, for which they would receive no reward. Orphan blocks are produced by nodes who solved the task but did not broadcast their results to the whole network the quickest due to network latency.
It takes time for a message to travel through a network, and it is entirely possible for 2 nodes to complete the task and start to broadcast their results to the network at roughly the same time, while one’s messages are received by all other nodes earlier as the node has low latency.
Imagine there is a network latency of 1 minute and a target block time of 2 minutes. A node could solve the task in around 1 minute but his message would take 1 minute to reach the rest of the nodes that are still working on the solution. While his message travels through the network, all the work done by all other nodes during that 1 minute, even if these nodes also complete the task, would go to waste. In this case, 50% of the computational power contributed to the network is wasted.
The percentage of wasted computational power would proportionally decrease if the mining difficulty were higher, as it would statistically take longer for miners to complete the task. In other words, if the mining difficulty, and therefore targeted block time is low, miners with powerful and often centralized mining facilities would get a higher chance of becoming the block producer, while the participation of weaker miners would become in vain. This introduces possible centralization and weakens the overall security of the network.
However, given a limited amount of transactions that can be stored in a block, making the block time too longwould decrease the number of transactions the network can process per second, negatively affecting network scalability.
3. Bitcoin’s additional features
Segregated Witness (SegWit)Segregated Witness, often abbreviated as SegWit, is a protocol upgrade proposal that went live in August 2017.
SegWit separates witness signatures from transaction-related data. Witness signatures in legacy Bitcoin blocks often take more than 50% of the block size. By removing witness signatures from the transaction block, this protocol upgrade effectively increases the number of transactions that can be stored in a single block, enabling the network to handle more transactions per second. As a result, SegWit increases the scalability of Nakamoto consensus-based blockchain networks like Bitcoin and Litecoin.
SegWit also makes transactions cheaper. Since transaction fees are derived from how much data is being processed by the block producer, the more transactions that can be stored in a 1MB block, the cheaper individual transactions become.
The legacy Bitcoin block has a block size limit of 1 megabyte, and any change on the block size would require a network hard-fork. On August 1st 2017, the first hard-fork occurred, leading to the creation of Bitcoin Cash (“BCH”), which introduced an 8 megabyte block size limit.
Conversely, Segregated Witness was a soft-fork: it never changed the transaction block size limit of the network. Instead, it added an extended block with an upper limit of 3 megabytes, which contains solely witness signatures, to the 1 megabyte block that contains only transaction data. This new block type can be processed even by nodes that have not completed the SegWit protocol upgrade.
Furthermore, the separation of witness signatures from transaction data solves the malleability issue with the original Bitcoin protocol. Without Segregated Witness, these signatures could be altered before the block is validated by miners. Indeed, alterations can be done in such a way that if the system does a mathematical check, the signature would still be valid. However, since the values in the signature are changed, the two signatures would create vastly different hash values.
For instance, if a witness signature states “6,” it has a mathematical value of 6, and would create a hash value of 12345. However, if the witness signature were changed to “06”, it would maintain a mathematical value of 6 while creating a (faulty) hash value of 67890.
Since the mathematical values are the same, the altered signature remains a valid signature. This would create a bookkeeping issue, as transactions in Nakamoto consensus-based blockchain networks are documented with these hash values, or transaction IDs. Effectively, one can alter a transaction ID to a new one, and the new ID can still be valid.
This can create many issues, as illustrated in the below example:
Since the transaction malleability issue is fixed, Segregated Witness also enables the proper functioning of second-layer scalability solutions on the Bitcoin protocol, such as the Lightning Network.
Lightning NetworkLightning Network is a second-layer micropayment solution for scalability.
Specifically, Lightning Network aims to enable near-instant and low-cost payments between merchants and customers that wish to use bitcoins.
Lightning Network was conceptualized in a whitepaper by Joseph Poon and Thaddeus Dryja in 2015. Since then, it has been implemented by multiple companies. The most prominent of them include Blockstream, Lightning Labs, and ACINQ.
A list of curated resources relevant to Lightning Network can be found here.
In the Lightning Network, if a customer wishes to transact with a merchant, both of them need to open a payment channel, which operates off the Bitcoin blockchain (i.e., off-chain vs. on-chain). None of the transaction details from this payment channel are recorded on the blockchain, and only when the channel is closed will the end result of both party’s wallet balances be updated to the blockchain. The blockchain only serves as a settlement layer for Lightning transactions.
Since all transactions done via the payment channel are conducted independently of the Nakamoto consensus, both parties involved in transactions do not need to wait for network confirmation on transactions. Instead, transacting parties would pay transaction fees to Bitcoin miners only when they decide to close the channel.
One limitation to the Lightning Network is that it requires a person to be online to receive transactions attributing towards him. Another limitation in user experience could be that one needs to lock up some funds every time he wishes to open a payment channel, and is only able to use that fund within the channel.
However, this does not mean he needs to create new channels every time he wishes to transact with a different person on the Lightning Network. If Alice wants to send money to Carol, but they do not have a payment channel open, they can ask Bob, who has payment channels open to both Alice and Carol, to help make that transaction. Alice will be able to send funds to Bob, and Bob to Carol. Hence, the number of “payment hubs” (i.e., Bob in the previous example) correlates with both the convenience and the usability of the Lightning Network for real-world applications.
Schnorr Signature upgrade proposalElliptic Curve Digital Signature Algorithm (“ECDSA”) signatures are used to sign transactions on the Bitcoin blockchain.
However, many developers now advocate for replacing ECDSA with Schnorr Signature. Once Schnorr Signatures are implemented, multiple parties can collaborate in producing a signature that is valid for the sum of their public keys.
This would primarily be beneficial for network scalability. When multiple addresses were to conduct transactions to a single address, each transaction would require their own signature. With Schnorr Signature, all these signatures would be combined into one. As a result, the network would be able to store more transactions in a single block.
The reduced size in signatures implies a reduced cost on transaction fees. The group of senders can split the transaction fees for that one group signature, instead of paying for one personal signature individually.
Schnorr Signature also improves network privacy and token fungibility. A third-party observer will not be able to detect if a user is sending a multi-signature transaction, since the signature will be in the same format as a single-signature transaction.
4. Economics and supply distributionThe Bitcoin protocol utilizes the Nakamoto consensus, and nodes validate blocks via Proof-of-Work mining. The bitcoin token was not pre-mined, and has a maximum supply of 21 million. The initial reward for a block was 50 BTC per block. Block mining rewards halve every 210,000 blocks. Since the average time for block production on the blockchain is 10 minutes, it implies that the block reward halving events will approximately take place every 4 years.
As of May 12th 2020, the block mining rewards are 6.25 BTC per block. Transaction fees also represent a minor revenue stream for miners.
Hello, readers of my blog. In previous atomic wallet articles I described how to buy BTC with a credit card and transfer assets to other resources. This article will consider buying ETH.submitted by FVB15 to CryptoICONews [link] [comments]
This is a multi-currency wallet that supports most major cryptocurrencies and tokens of different projects. The platform interface is simple and user-friendly. At the moment, it supports more than 300+ tokens and periodically adds new coins. The application constantly updates and improves security, for the safe storage of users’ crypto active assets.The Swap option is very convenient and helps you, for example, exchange LTC for BTC inside the wallet, without using exchangers. Swap Markets has user orders, and you can choose the right volume and price for you. There is also a great option to exchange cryptocurrency inside the wallet. We go to the exchange, choose an asset for exchange and for which cryptocurrency you want to exchange. The action takes place through the partners of the platform and does not take much time.Mobile application you can download here https://play.google.com/store/apps/details?id=io.atomicwallet
Decentralized wallet solution is a criterion of transparency, reliability, and security, in my opinion, the most important components for storing your assets. Atomic Wallet supports most blockchains (XRP, XLM, XMR, and others).In more detail, you can familiarize yourself with the project on their official website https://atomicwallet.io/Great app for storing your assets. According to the developers, the security of your funds is fully protected. Everything is under your control, passwords are stored with you, you can restore the wallet using the mnemonic 12 words that you write down during installation. Read more about this and how it works here https://atomicwallet.io/what-are-private-keys-and-how-they-work
Your safety is completely in your hands. Do not store keys and mnemonic words on the computer.Compliance with decentralization makes this wallet private and I think users will appreciate the development of a team of project professionals.
This video will help you understand how to buy ETH
Go to the Buy crypto tab:
After confirming your identity, you choose an amount that is automatically converted into euros or US dollars, then Simplex approves your request and exchanges.
Cryptocurrency can be bought with a credit card. Consider a purchase, on the example of the card Simplex. Simplex is a company that provides secure payment processing worldwide, with minimal risk and no fraud. The technology of this company has proven itself on the market from the positive side and allows you to process online payments, for users, with great speed and increased conversion of declined transactions. Among the partners of the system are well-known exchanges Binance, Kukoin, and many other companies. In more detail, on the official website https://www.simplex.com/
Simplex ensures that exposure to risk is reduced to zero and is responsible for returns in case of fraud. The project acts as a trusted guarantor of the transaction and makes a confirmation only when all parties report that the transaction was successful. The reputation of the platform can be judged by numerous well-known partners who cooperate with the company Simplex.The collection of personal information is used to provide exchange services and prevent unauthorized actions. Information of users does not apply to third-party resources, and operates only within the system and is provided to companies that participate in a trade operation. At any time, you can delete your data, for this you need to write in support of the site.When you first purchase ETH, you need to go through the verification process (only once). The minimum threshold for acquiring cryptocurrency is $ 50. Credit or debit cards, Visa and MasterCard are accepted. Basically, the entire operation takes less than a day, but in most cases, much earlier. In less than an hour. If a problem arises, you will get a rejection and a full refund.
After confirming your identity, you choose an amount that is automatically converted into euros or US dollars, then Simplex approves your request and exchanges.
Atomic Wallet, eliminates the problem of interaction between different cryptocurrencies, it is a very convenient wallet that allows you to manage your assets in one place. Atomic Wallet charges you 2% commission.
Atomic Wallet: https://atomicwallet.io Buy Bitcoin - https://atomicwallet.io/buy-bitcoin Buy Litecoin - https://atomicwallet.io/buy-litecoin Buy Ethereum - https://atomicwallet.io/buy-ethereum Buy Ripple - https://atomicwallet.io/buy-ripple Buy Bitcoin Cash - https://atomicwallet.io/buy-bitcoin-cash
INFORMATION IN THE ARTICLE DOES NOT CALL ON EVERYONE TO BUY ANYTHING. IT PROVIDES AUTHOR'S ARTICLE ABOUT THE PROJECT.
Bitcointalk Username: FVB Bitcointalk Link: https://bitcointalk.org/index.php?action=profile;u=1808846
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News by Cointelegraph: Jinia Shawdagor
Earlier on, when Bitcoin (BTC) arrived on the scene, most cryptocurrency enthusiasts held on to their coins, as there were only so many places they could be spent. Nowadays, the list of marketplaces and retailers accepting Bitcoin and other cryptocurrencies is significantly larger, providing crypto enthusiasts with more options for making real-world purchases.
After all, with recognizable organizations like Microsoft and Wikipedia now accepting Bitcoin as payment, conversations about Bitcoin and the power of cryptocurrencies are becoming more prominent.
Currently, several fast-food restaurants and coffee shops have started accepting Bitcoin as payment. This will likely provide traction for mass adoption as cryptocurrency payments become increasingly commonplace in day-to-day purchases.
Granted, there are some jurisdictions that do not consider Bitcoin or any other cryptocurrency as legal tender. Despite this set back, even big tech companies like Facebook are coming up with payment systems that mimic cryptocurrencies.
Here are some of the leading retailers, merchants and companies that will let you book flights and hotels, buy coffee or pizza, or even go to space with crypto.
Pay for a burger in Germany with cryptoThe German branch of fast-food restaurant chain Burger King now claims to accept Bitcoin as payment for its online orders and deliveries, but this is not the first time Burger King has warmed up to Bitcoin as a form of payment.
The company, headquartered in Florida in the United States, had its Russian branch announce in 2017 that it would start accepting Bitcoin payments, but it ultimately did not take off. The global fast-food retailer reports an annual revenue of about $20 billion and serves about 11 million customers around the world. If all its outlets move to accept Bitcoin as payment, cryptocurrency adoption would inevitably spread.
Spend crypto at Starbucks and other placesFor crypto payments to gain traction, merchants need to implement systems that enable swift and easy cryptocurrency spending. Starbucks is one of the companies taking advantage of this concept through Flexa, a U.S.-based payment startup that is helping the cafe giant, as well as dozens of other companies, accept cryptocurrency payments.
The company developed an app called Spedn that enables crypto holders to make purchases with merchants like Starbucks. The company’s CEO believes that by making cryptocurrencies spendable in the mainstream, commerce will realize the full benefit of blockchain technology all over the world.
Crypto enthusiasts in Silicon Valley’s Palo Alto might already be familiar with Coupa Cafe for other reasons apart from its coffee and food. Through its partnership with a Facebook software developer, Coupa Cafe has been accepting Bitcoin as payment since 2013.
Reports show that the cafe received a steady stream of Bitcoin revenue as soon as they started implementing crypto payments — a clear sign of how eager its customers were to pay in Bitcoin. Coupa Cafe is among the few physical businesses in Palo Alto that accept Bitcoin at the moment. The cafe owners believe that their collaboration with the Facebook software engineer will create more traction in terms of Bitcoin adoption.
Buy food with cryptoWith over 50,000 takeaway restaurants listed on its United Kingdom-based site, OrderTakeaways is one of the surest ways to get a pizza paid for with crypto delivered to your doorstep. The company has been accepting Bitcoin payments for online takeout orders since 2018. And other similar services include the Korean platform Shuttledelivery as well as German-based service Lieferando and its subsidiaries in several other countries.
Apart from online orders, crypto can also be spent at a regular Subway restaurants. As early as 2013, several Subway branches started accepting Bitcoin as payment. Now, for a fraction of a Bitcoin, a Subway sandwich can be purchased at select restaurants.
Pay with Bitcoin to tour spaceBesides buying food and inexpensive, day-to-day items with crypto, a trip to space can now be bought with Bitcoin. That’s right. Richard Branson’s space tourism company, Virgin Galactic, started accepting Bitcoin as payment as far back as 2013. Although Branson’s predicted date for the first commercial flight has been pushed back several times, the company achieved its first suborbital space flight last year. Perhaps soon, people will be able to tour the moon on crypto’s dime.
Buy jewelry with BitcoinA brick-and-mortar American jewelry company called Reeds Jewelers accepts Bitcoin for both its physical and online stores. What’s more, if a purchase is worth more than $25,000, the company provides free armored delivery for safety. Other jewelry companies accepting Bitcoin include Blue Nile Jewelry, Stephen Silver Fine Jewelry and Coaex Jewelry, to name a few.
A big advantage of purchasing large ticket items — like a diamond — with crypto is that it makes moving around large amounts of money cheap and effortless. Reports show that more Silicon Valley investors are buying jewelry with Bitcoin. Last year, Stephen Silver Fine Jewelry reported a 20% growth in crypto transactions, leading to a boost in the company’s sales. The company has been accepting Bitcoin since 2014.
Send and redeem gift cards with BitcoinGyft, a digital platform that allows users to buy, send and redeem gift cards, was one of the first merchants enabling cryptocurrency adoption to gain traction in the real world. The mobile gift card app allows Bitcoin to be used to purchase gift cards from several retailers, some of which include Burger King, Subway, Amazon and Starbucks. The company has also partnered with popular crypto exchange Coinbase to enable users to buy gift cards from their Coinbase wallets.
Travel and pay in BitcoinIf a traveler only has Bitcoin at their disposal, the following merchants will gladly offer services in exchange for it. TravelbyBit, a flight and hotel booking service, accepts cryptocurrencies like Bitcoin, Binance Coin and Litecoin (LTC) as payment.
With a network of over 300 crypto-friendly merchants, the platform is one of the biggest supporters of crypto adoption. TravelbyBit can also alert you to upcoming blockchain events in order to interact with other crypto enthusiasts from around the globe. Other platforms to book flights with crypto include Destinia, CheapBizClass, CheapAir, AirBaltic, Bitcoin.Travel and ABitSky, among others.
Use crypto to book a five-star hotel in ZurichIf ever one finds themselves traveling to Zurich Switzerland, either BTC or Ether (ETH) can be used to pay for a stay in a five-star hotel in Zurich. In May 2019, five-star hotel and spa Dodler Grand announced that it will start accepting Bitcoin and Ether as payment.
The hotel has partnered with a fintech firm Inacta as well as Bity (a Swiss-based crypto exchange) to facilitate the payment and conversion of crypto to fiat money. The hotel boasts an amazing view of the Swiss landscape among other enticing amenities that come with a five-star hotel.
Pay for electronics and more with cryptoFor all the gadget lovers, there are a bunch of platforms that allow electronic purchases with cryptocurrency. Newegg, for instance, is an electronic retail giant that uses BitPay to process payments made with digital currencies. Even though one cannot get refunds for Bitcoin purchases, Newegg has a good reputation for quality items.
Plus, the company boasts its being among the first merchants to support cryptocurrency adoption. Other platforms for gadget junkies include Eyeboot (a platform that sells crypto mining rigs in exchange for crypto), Microsoft, FastTech and Alza (a U.K.-based online store that sells phones and beauty products).
An ever-expanding listIt seems clear that more retailers are warming up to the idea of accepting cryptocurrencies. There is still a long way to go before full adoption can be achieved, but many companies have nevertheless benefited from being early adopters. Despite the volatile price movements of cryptocurrencies, all evidence points to a future cashless society that uses digital currencies, and crypto is leading the way.
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