Binance Academy Glossary Submission Bounty - ROUND 2 ...

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Support for all your IOTA (Cryptocurrency) related problems. For hatred of pending transactions, to advanced hatred of API, and volleyball.
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How to trade Bitcoin Future

How to trade Bitcoin Future


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Bitcoin is troublesome to use.
But bitcoin’s isue may build it additional valuable.
So, what’ reality regarding bitcoin’s future?
Bitcoin mining may be a senseless waste of energy.
As bitcoin hits mainstream media, the subject of bitcoin mining
bubble regarding to pop.For ten years, the media has enjoyed painting bitcoin as a bubble concerning to pop. They’ve gleefully pronounced the bubble popped and bitcoin dead … over 350 times. However the reality regarding bitcoin is that it keeps coming back back. Why?

Charlie Munger called bitcoin “worthless artificial gold.” Others in the media have likened bitcoin to a bubble, a “tulip mania,” and different strong statements
Each time bitcoin improves itself (like with Segwit
Segregated Witnesses. A protocol implemented by Bitcoin to extend transaction speed. SegWit allows a lot of transactions to be written into a single block on a blockchain.

or the Lightning Network), or will increase in value, the media is keen and ready to jump on it, decrying and denouncing it.
Therefore what’s the reality behind bitcoin’s price -- is it extremely a bubble?
The reality regarding bitcoin is straightforward; it's experiencing the same rise and fall cycles as each new technology and asset catego
The web also experienced a bubble. Shares of dotcom firms rose by a thousandpercent on a daily basis. Then it all tumbled down. However we have a tendency to’re still using the web, aren’t we have a tendency to? More than ever, in fact.

Stocks conjointly experienced big boom and bust cycles, especially in their early days.

We might feel like stocks have been around forever -- and to us they need. However stocks conjointly had a starting, and a rough one too. Once upon a time in 1531, when the first stocks were invented, they saw extraordinary volatility, scams, and no regulation. In fact, before stock exchanges, they were sold at occasional shops -- just like cryptocurrencies were sold on la peer to peer

marketplace, before exchanges came online.
Even property, viewed by the majority as “the safest investment” experienced a dramatic cycle. Business Insider reported that “Between 2006 and 2014, nearly ten million homeowners in America saw the foreclosure sale of their own homes.” And tens of thousands became homeless as a result of of it. Nevertheless --- we have a tendency to’re still living in homes, aren’t we?

The future of bitcoin would possibly be the identical as that of stocks, bonds, assets, and the web. It rises and falls like all the others, and it is currently terribly volatile -- but that’s as a result of it’s young.

Stocks have been around for 400 years. Dotcom corporations for forty years. Bitcoin is solely 10 years previous -- and cryptocurrencies, normally, are even younger. But slowly, they will become a part of our daily lives.

Rich investors are manipulating costs!
Look at this headline from the Independent: “Bitcoin price Crash: 'Manipulative Whales

Whale
A very wealthy individual capable of creating massive trades.
View full glossary
' cause Cryptocurrency Market Meltdown!”
It’s sensationalism, pure and straightforward. The article goes on to rant against these therefore-known as “whales” -- individuals who own voluminous dollars of BTC -- as evil-doers who’s solely thought is profit.

This type of sensationalism is meant to harm Bitcoin’s future; to scare people faraway from doing research and thinking for themselves.

Nonetheless, this statement is somewhat true. Up to eighty five% of Bitcoin’s supply is solely owned by onepercent of wallet addresses.




But there’s an important point to be made about these numbers. Most of the prime percentage of wallets is not owned by whales -- but by exchanges

Exchange
On-line platforms on which people can buy and sell cryptocurrencies.
View full glossary
.
However their result is getting smaller and smaller.
A company referred to as Chainalysis -- that makes a speciality of analyzing the Bitcoin blockchain

-- found that “the actual threat that all whales pose to the cryptocurrency economy is relatively low. If they sold off their entire holdings, it'd be effectively a $3.9 billion sale at current costs. That’s not even tenpercent of this total market capitalization of Bitcoin.”
This is as a result of, as I hinted above, several of those wallets holding such vast sums are the ‘cold wallets

’ (wallets held offline) belonging to major exchanges like Coinbase, Kraken, Binance, and more. These wallets cannot be used to manipulate the price, diminishing the potential impact of enormous ‘whales’ selling their positions.
Bitcoin is simply too slow for use as a currency.
The reality regarding Bitcoin is that yes, it's slower than VISA, Mastercard, and alternative centralized electronic payment systems.

Paying together with your credit cards takes seconds and the network can handle payments around the globe twenty fouseven. But, though Bitcoin can additionally be used around the world, confirmation

of payment takes an average of 10 minutes; during the bitcoin craze recently 2017, confirmation times might take hours.
Moreover, VISA on average processes around 2,00zero transactions per second (tps). This means the amount of payments individuals make per second on the network. VISA includes a maximum of twenty four,00zero TPS. Bitcoin, by distinction, has a maximum of ten TPS. This argument has been place forward by several critics over the years and picked up by the media as the doom of bitcoin’s future.

However Bitcoin could be a technology that evolves.
Now let’s assume regarding Bitcoin’s past for a moment. The coin and its underlying technology -- the blockchain -- are only ten years previous. When the web was ten years old -- the year was 1989. Do you keep in mind the net in 1989? I sure do.



payments in exchange for not revealing sensitive info. So, in bound ways that, BTC and cryptocurrencies offer hackers a lot of options.
However money continues to be king for every criminality.
Though it’s true that hackers and phishers do typically ask for payment in BTC

There’s an aphorism: “money talks.” It means that that if you would like to get something done -- the best argument you can build is to place down a stack of money. When Bitcoin rose to fame, the primary headlines focused around Bitcoin being the prime choice for criminality.

But Lilita Infante, Special Agent for the DEA (Drug Enforcement Administration) has some contradictory info regarding this. She was one among a ten-person Cyber Investigative Task Force team whose primary aim was the dark web and crypto-related investigations. This cluster is no little force. They collaborate with the Department of Justice, FBI, and also the Bureau of Alcohol, Tobacco, Firearms and Explosives. And she went on the record to talk regarding what share of bitcoin transactions are literally being employed for illegal things; she said that “illegal activity has shrunk to about 10 p.c.”

Only tenp.c of all the transactions on the Bitcoin network could be used for illegal things. Which number is falling.

The fall in Bitcoin’s use among criminals is due to several factors. The most prominent factor is that Bitcoin is no longer anonymous. Sciencemag wrote a full report on how governments are developing and using techniques to explore the Bitcoin blockchain and notice criminals by tracing their bitcoin payments.

Paying with bitcoin isn’t simple.
I’ve heard this argument flow into widely throughout the years. I still hear it from my grandpa each vacation dinner. He didn’t see a Bitcoin checkout option at the grocery when he bought the turkey -- therefore it’ll never be used.



Perhaps Bitcoin is on its means to being such a store of worth. For 10 years now bitcoin has been ready to be saved and retrieved and exchanged -- and it’s worth has only gone up (bumpy but up).

Need to get more cryptocurrencies? Check out our top 5 cryptocurrencies to shop for, whether you’re a beginner or an experienced investor!

Bitcoin is difficult to use.
Bitcoin, like all new technologies, isn't the most user-friendly.

You would like to line up a wallet, bear in mind a seed phrase, and several additional steps. Sending and receiving BTC

payments additionally involves steps of copy/pasting long strings of random letters and numbers. It’s powerful, I hear ya.


I additionally keep in mind all the steps I needed to require to send emails back when those were new. Insert a CD from AOL into my computer. Install AOL. Unplug my phone line. Plug in my Modem. Wait for it to make all those noises and finally connect. Then set up my AOL email and password. It was quite the method.

My grandfather never thought emails would come out and even my mother said folks would perpetually like handwriting letters (and using a physical dictionary for spell check!) and sending through the post.


Think about it the approach we tend to assume about gold. Not everyone has gold. It’s also a bit difficult to own.

If you wish to own gold for its ‘store of price’ properties, you wish to seek out a specialized look to buy investment gold. You need to store it somewhere, sort of a personal safe or a bank vault, and bear in mind the password. This is somewhat troublesome.

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Perhaps Bitcoin’s problem will facilitate it retain its value, just like gold
You Might Conjointly Like: The 5 est Bitcoin Sports Betting Sites
https://www.cryptoerapro.com/bitcoin-future/
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What Is Proof of Work (PoW)?

What Is Proof of Work (PoW)?
Contents
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Introduction
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:
  • It’s expensive for you to mine.
  • You’re rewarded if you produce a valid block.
  • Knowing an input, a user can easily check its hash — non-mining users can verify that a block is valid without expending much computational power.
So far, so good. But what if you try to cheat? What’s to stop you from putting a bunch of fraudulent transactions into the block and producing a valid hash?
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 Stake

There 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 thoughts

Proof 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.
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Bitcoin (BTC)A Peer-to-Peer Electronic Cash System.

Bitcoin (BTC)A Peer-to-Peer Electronic Cash System.
  • Bitcoin (BTC) is a peer-to-peer cryptocurrency that aims to function as a means of exchange that is independent of any central authority. BTC can be transferred electronically in a secure, verifiable, and immutable way.
  • Launched in 2009, BTC is the first virtual currency to solve the double-spending issue by timestamping transactions before broadcasting them to all of the nodes in the Bitcoin network. The Bitcoin Protocol offered a solution to the Byzantine Generals’ Problem with a blockchain network structure, a notion first created by Stuart Haber and W. Scott Stornetta in 1991.
  • Bitcoin’s whitepaper was published pseudonymously in 2008 by an individual, or a group, with the pseudonym “Satoshi Nakamoto”, whose underlying identity has still not been verified.
  • The Bitcoin protocol uses an SHA-256d-based Proof-of-Work (PoW) algorithm to reach network consensus. Its network has a target block time of 10 minutes and a maximum supply of 21 million tokens, with a decaying token emission rate. To prevent fluctuation of the block time, the network’s block difficulty is re-adjusted through an algorithm based on the past 2016 block times.
  • With a block size limit capped at 1 megabyte, the Bitcoin Protocol has supported both the Lightning Network, a second-layer infrastructure for payment channels, and Segregated Witness, a soft-fork to increase the number of transactions on a block, as solutions to network scalability.

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1. What is Bitcoin (BTC)?

  • Bitcoin is a peer-to-peer cryptocurrency that aims to function as a means of exchange and is independent of any central authority. Bitcoins are transferred electronically in a secure, verifiable, and immutable way.
  • Network validators, whom are often referred to as miners, participate in the SHA-256d-based Proof-of-Work consensus mechanism to determine the next global state of the blockchain.
  • The Bitcoin protocol has a target block time of 10 minutes, and a maximum supply of 21 million tokens. The only way new bitcoins can be produced is when a block producer generates a new valid block.
  • The protocol has a token emission rate that halves every 210,000 blocks, or approximately every 4 years.
  • Unlike public blockchain infrastructures supporting the development of decentralized applications (Ethereum), the Bitcoin protocol is primarily used only for payments, and has only very limited support for smart contract-like functionalities (Bitcoin “Script” is mostly used to create certain conditions before bitcoins are used to be spent).

2. Bitcoin’s core features

For a more beginner’s introduction to Bitcoin, please visit Binance Academy’s guide to Bitcoin.

Unspent Transaction Output (UTXO) model

A 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.
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Nakamoto consensus

In 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.

The blockchain

Block production

The 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.

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Block time and mining difficulty

Block 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.
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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:
  1. Alice sends Bob 1 BTC, and Bob sends Merchant Carol this 1 BTC for some goods.
  2. Bob sends Carols this 1 BTC, while the transaction from Alice to Bob is not yet validated. Carol sees this incoming transaction of 1 BTC to him, and immediately ships goods to B.
  3. At the moment, the transaction from Alice to Bob is still not confirmed by the network, and Bob can change the witness signature, therefore changing this transaction ID from 12345 to 67890.
  4. Now Carol will not receive his 1 BTC, as the network looks for transaction 12345 to ensure that Bob’s wallet balance is valid.
  5. As this particular transaction ID changed from 12345 to 67890, the transaction from Bob to Carol will fail, and Bob will get his goods while still holding his BTC.
With the Segregated Witness upgrade, such instances can not happen again. This is because the witness signatures are moved outside of the transaction block into an extended block, and altering the witness signature won’t affect the transaction ID.
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 Network

Lightning 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.
https://preview.redd.it/cy56icarf3151.png?width=1601&format=png&auto=webp&s=b239a63c6a87ec6cc1b18ce2cbd0355f8831c3a8
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 proposal

Elliptic Curve Digital Signature Algorithm (“ECDSA”) signatures are used to sign transactions on the Bitcoin blockchain.
https://preview.redd.it/hjeqe4l7g3151.png?width=1601&format=png&auto=webp&s=8014fb08fe62ac4d91645499bc0c7e1c04c5d7c4
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.
https://preview.redd.it/axg3wayag3151.png?width=1601&format=png&auto=webp&s=93d958fa6b0e623caa82ca71fe457b4daa88c71e
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 distribution

The 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.
submitted by D-platform to u/D-platform [link] [comments]

CC - We've spent the past 8 months building Binance Academy, an entirely free educational portal with no advertisements.

Hi /CryptoCurrency
With the recent market upturn, the amount of people interested in blockchain technology has come with it.
We, Binance Academy, have spent the bear market building an entirely free educational platform for anyone to access. No ads, no paid content, free to use, always and available in 16 languages.

I'd like to know what you'd like to see next on Binance Academy - Are there any topics you'd like to learn?
Binance Academy Content:
Blockchain Security Economics
Byzantine Fault Tolerance Explained What Is a Dusting Attack What Are Forward and Futures Contracts
Blockchain Use Cases: Charity What Is Symmetric Key Cryptography MACD Indicator Explained
What Makes a Blockchain Secure? Pyramid and Ponzi Schemes What Is Technical Analysis
Hybrid PoW/PoS Consensus Explained What Is a 51% Attack Stochastic RSI Explained
Blockchain Use Cases What Is a DoS Attack What Is Quantitative Easing?
Blockchain Use Cases: Healthcare What Is Social Engineering? What Is Hyperinflation
Blockchain Use Cases: Supply Chain General Security Principles What Is Inflation
zk-SNARKS and zk-STARKS Explained Why Public Wifi Is Insecure What Is an ICO
Delayed Proof of Work Explained What Is a Replay Attack What Is Fractional Reserve
What Is a Coin Burn? What Is Public Key Cryptography Game Theory and Cryptocurrencies
Delegated Proof of Stake Explained History of Cryptography What Is Tulip Mania
What Is Ethereum? What Is a Multisig Wallet What Is Fiat Currency
Hard Forks and Soft Forks Ransomware Explained The 2008 Financial Crisis Explained
Proof of Stake Explained What Is CryptoJacking What Is Ripple
What is Lightning Network What Is a Keylogger Moving Averages Explained
What Is Cryptocurrency Sybil Attacks Explained Liquidity Explained
Blockchain Advantages and Disadvantages What Is Phishing What Is the RSI Indicator
What Is Ethereum Plasma? What Is Trust Wallet Bollinger Bands Explained
Proof of Authority Explained What are Makers and Takers
What Is Bitcoin?
Difference Between Blockchain and Bitcoin
History of Blockchain
What Is Cryptocurrency Mining?
What Is a Blockchain Consensus Algorithm
Proof of Work Explained
Proof of Burn Explained
What is Binance Coin?
How Does Blockchain Work?
What are Nodes?


Along with this, we also have a glossary with 143 crypto terms
submitted by Jager_Binance to CryptoCurrency [link] [comments]

Dxchain Alkademy - All about Mainnet?

Dxchain Alkademy - All about Mainnet?

Dxchain Mainnet

Recently, Dxchain team announced the launch of Dxchain project's mainnet alpha. You can find the article containing the release here.

In this article, the team summarized briefly on what mainnet entails as quoted below:

It is well known that mainnet is the fundamental of a blockchain project, cryptocurrency is not a real blockchain technology until the Mainnet launch. Any concepts, ideas or theories are not realizable. DxChain has been committed to building a secure and efficient decentralized big data storage and computing network from the beginning. The construction, development and performance of DxChain network are what DxChain engineers caring about. The release of DxChain Mainnet Alpha represents that DxChain has basically completed the construction of the public chain framework, in which smart contracts, storage contracts, DPoS consensus algorithms, mining and other functions have been developed; also represents DxChain's transformation from cryptocurrency to a real public chain.

The explanation is concise enough for an average crypto user to understand what mainnet is. In this article, I will try to expand a bit farther on the idea of mainnet and why it is necessary for a project like DxchainNetwork to have a mainnet.

In the forum discussion I started here, I gathered knowledge of how mainnet works which gave me the clear insight of what I needed to know. Firstly, let us take a deeper look of what a mainnet is.

What Is A Mainnet?

Before now, On July 8, Dxchain launched her testnet and officially announced it here. It evidenced that the Dxchain Team had the prototype of the project up for running. That brings me to contrasting between Mainnet and Testnet. A Mainnet stands for the "Main Network" is the “real” cryptocurrency network where testnet represents a dummy alternatively network for the purposes of testing only. The cryptocurrency coins/token generated on testnet mostly aren't real since they do not have any monetary value as compared to that of mainnet with monetary value.

The functionality of transferring a digital currency between the parties involved is rendered on the mainnet. It is on the mainnet that the decentralized applications are developed and deployed.

According to Binance Academy ,Mainnet is the term used to describe when a blockchain protocol is fully developed and deployed, meaning that cryptocurrency transactions are being broadcasted, verified, and recorded on a distributed ledger technology (blockchain).
In cryptocurrencies, mainnets are the end products in blockchain projects that make it possible for transactions to be carried out. It also undergoes changes from time to time when there is need for updates or review. Before an investors makes his decision to invest in an Initial Coin Offering (ICO), it appears very crucial to be sure the blockchain project has a mainnet. Both mainnet or a testnet indicate the seriousness of a project as they affect the price of a cryptocurrency in one way or another.

Does Mainnet Affect Price of coin?

On Dxchain's telegram communuty, I have witnessed several users asking questions like "Admin, Why the pump?, "Admin, price is high. Why! and so on. It is obvious there are so many who seem not having the right information before investing in a coin resulting in them either losing or missing out of good projects. This accounts for why this article is necessary. Continuous upgrades and revision of the mainnet function is a must if a cryptocurrency project is to enjoy wide success in terms of rising price which I believe the Dxchain Team have in their routine plan board. For instance, Bitcoin is one project that has enjoyed immense success in cryptocurrency environment, in part because of Mainnet upgrades.

Recently, the top cryptocurrency by market capitalization launched Lightning Network -a mainnet feature that added a second layer on the blockchain. The Off-chain solution was a significant update intended to make BTC more scalable thus allowing the blockchain to handle more transactions per second.`

Conclusion

In conclusion, a mainnet launch is a planned and or defining time for a blockchain project to open to public and commence mass adaptation. When a blockchain project team is ready to roll out their official end product, they will carry out a “mainnet launch”, putting the product into actual production and operations.


Resources
Reference 1
Reference 2
Website
Telegram
Reddit
submitted by Bobelr to DxChainNetwork [link] [comments]

Newdex Creates A One-Stop Service For Users

Originally posted by ankarlie :
https://steemit.com/eos/@ankarlie/newdex-creates-a-one-stop-service-for-users-fa5ab781031d5est
Newdex is a new kind of Decentralized Exchange that is able to provide unprecedented user experience of decentralized trading, which is only possible with highly scalable blockchain technology. The previous generation decentralized exchanges are not able to do this due to blockchain technological limitations their DEX are based on. The Newdex team chose to build on top of one of the most scalable blockchains known in the industry, EOS and has been continuously improving its DEX adding features after features to bring more value into its ecosystem.
On-chain Execution
It has become the world’s leading decentralized exchange that features on-chain matching and settlement) through the utilization of smart contracts. In simple words, all trading activities done on the exchange are triggered and recorded in the EOS high-performance blockchain achieving a whole new level of trust without the wait and associated cost seen in previous blockchain generations. This makes fast and high-frequency trading not only possible but feasible due to the EOS’ unique transactionless design and resource allocations. More importantly, data in the DEX are transparent and immutable.
Non-Custodial Trading
It also features non-custodial trading where users never lose custody of their digital assets, not until the moment the conditions of their trades are met and thereby executed. By doing so the exchange does not attract unwanted attention from hackers looking for their next crypto honeypot to exploit. Since wallets used in Newdex are non-custodial wallets there will never be a point where users can be restricted from access of their own digital assets. Unlike centralized exchanges, Newdex does not ask for the custodianship of tokens. While there are some feature in Newdex that requires locking up of some assets, unlocking them are within the power of users and does not require access to Newdex website.
Zero Deposit and Withdrawal Fees
Additionally, deposits and withdrawals in Newdex are instant and users will never be charged with fees. This allows frictionless trading within its platform and presents a quick way of having access to all available digital assets in the non-custodial wallet that has been linked. Once wallets are linked all cryptocurrencies contained in the wallet will immediately be detected by Newdex for immediate trading. This is a more efficient and cost-effective way of having access to digital assets. CEX requires users to send each of the assets one by one which is not only cumbersome but also costly as users have to spent transfer fees or resources to send them.
Private Keys not required
As an additional layer of security, Newdex decentralized bourse will never ask for the private keys of its users. Instead, users can log in using the widest range of wallets available for EOS, EOS sidechains, and TRON. This is one of the most striking features of Newdex as it essentially supports almost all types of login options for all supported platforms. Desktop wallets, Chrome extension wallets, and mobile wallets can be used to login to its DEX without having to ask the users to reveal their private keys. This highlights Newdex’s emphasis on security, privacy, and ease of use.
Pervasive
Newdex has become the quintessential DEX in EOS space becoming the go-to listing partner of many EOS-based projects and has been supported by virtually every wallet service provider that supports EOS. This demonstrates the market penetration of Newdex and the reputation it has gained throughout its existence. Its presence and market influence is the direct result of providing the first truly global decentralized exchange based on EOS and continuously building on its brand by providing high quality, relevant and timely products, and services.
Newdex Platform Ecological Token (NDX)
Newdex issued its own utility token dubbed as the Newdex platform Ecological Token (NDX). Its primary purpose is to serve as the platform’s primary currency for services its offers. These include VIP membership Fee, repurchase and destruction, staking concessions, Token airdrops, advertising bidding, independent listing and more. It is currently listed in Newdex with pairs of NDX/EOS and NDX/USDT. Recently it has been used to rewards those who opted to undergo identity verification for OTC services of the Newdex Platform.
Newdex Free CPU trades for VIP members
Newdex has been built on top of one of the most scalable and feature-filled blockchains in the entire cryptocurrency ecosystem. To elevate the trading experience of its users further, Newdex is giving its users limited Free CPU placing order in trades depending on their VIP levels. The CPU-free placing order time as shown below:
📷
This would allow its traders to execute trades without having to worry on having enough CPU-time EOS resources.
Multilingual
Newdex is designed to be a frictionless and borderless decentralized exchange, as such, it offers multilingual support to cover all the most active crypto trading jurisdiction in the world. Currently, it supports English, Korean, Chinese and Chinese tranditional. It is expected that more languages will be supported in the future as Newdex expands to new markets.
Simple yet Power User Interface (UI)
One of the first things users will notice about Newdex is its simple yet powerful user interface (UI) that enables them to gain access to all important features easily and conveniently. Its design is clean and purposeful without excess information clottering the screen enabling users to concentrate on what they are doing. The additional features of the DEX are carefully tucked away but easily accessible through the many non-intrusive menus buttons smartly positioned for optimal use. Hidden behind this elegant UI is a new breed of decentralized exchange that truly raises the bar of excellence in Decentralized Finance (DEFI) particularly the DEX sector.
Multi-Chain Trading
The recent support for TRON reveals its openness and intent of supporting other high-performance public blockchains to achieve multi-chain trading. This opens up unlimited opportunities for growth for Newdex not only in terms of partnerships with other blockchain projects but also in terms of user base as each of these projects typically has its own supporters and believers. The willingness of the Newdex Team to work in both EOS and TRON platform demonstrates their flexibility and agility to react to current market conditions in a meaningful and timely fashion.
Excellent Tech support
To give the very best tech support to its users, Newdex has hired the services of Zendesk, a software company that is headquartered in San Francisco and listed on the New York Stock Exchange. The support page is very well organized and response times are top-notch. Nothing less is be expected from a professional tech support team. The same company is also used by many well-established blockchain-based companies who want professional-level services for its tech support.
Highly ranked among dApps Trading Platforms
📷
It comes to no surprise that Newdex has consistently ranked on top of dApps data services providers, such as the Dappradar, in terms of the trading volume. This makes them the top EOS-based DEX in the space. This is just a confirmation of what we already knew about Newdex and about its team who tirelessly seek out new innovative products and services with the purpose of bringing to the crypto trading community the very best of what DEX trading has to offer. But wait there is more! Its newest innovation is explained in the next section where it tries to marry traditional and blockchain-based fintech together.
How to Join the Newdex OTC marketplace?
Regulatory compliance requires the Newdex team to ask its users to accomplish KYC and AML procedures before they can avail of the OTC services. Prospective users are required to declare their identity, contact information and to submit proof to validate the information submitted. Once this information has been approved users can start using the OTC market.
While the Newdex team values the privacy of its customers they also acknowledge the need for such procedures for the safety of its users since the service entails interaction with government-issued assets (fiat) as well as to be able to resolve disputes when the need arises. Currently, the platform only offers Renminbi or the Chinese Yuan CNY for fiat purchases and has expressed the intention to expand to other fiat options in the near future.
NDX Rewards For OTC Participants
As a way to celebrate the launch of their OTC services and to rewards participants who undergo KYC procedures the Newdex Team have initiated the Newdex OTC NDX Rewards Program. Users who will participate in Identity Verification Procedures will receive NDX. The program started November 25, 2019, and will end at 9:00 am Decemver 16, 2019 (UTC).
There are two activities where users can join and they are allowed to join both so long as they qualify. Rewards are limited and will be distributed based on a first come first serve basis. Since the rewards program is sponsored by Newdex, their final interpretation of the results of the rewards program are final and cannot be reconsidered.
The first activity (Activity 1) is the real name verification. The total rewards for this activity is 2,500 NDX
Activity Rules: During the activity, users who log in to Newdex and complete the real name verification on the OTC fiat trading page can claim NDX reward:
Reward 500 NDX via completing the primary verification (3,000 openings).
Reward 2,000 NDX via completing the intermediate verification (3,000 openings).
The second activity (Activity 2) is the fiat trading which has a total reward of 2,200 NDX
Activity Rules: During the activity, users who log in to Newdex and complete EOS or USDT trading on the OTC fiat trading page can claim NDX reward:
One time reward of 200 NDX for a single order ≥ 50 EOS/150 USDT
One time reward of 2,000 NDX for a single order ≥ 500 EOS/1500 USDT
Newdex’s One-Stop Service
Newdex has proven once again why it is the leading high-performance decentralized exchange in the space as follows:
Providing scalable decentralized exchange trading
Instant and Secure
Non-custodial
On-Chain matching and Settlement
Transparent and Immutable
No Deposits and Withdrawals Fees
Top-rated trading dApps
Highest trading volumes
Most supported DEX by top wallet service providers
Offering the widest range of EOS-based tokens including EOS Native Tokens and EOS Sidechains
Multichain Trading
Added Support to Tron-based Tokens
Plans to support other high-performance blockchains
Providing innovative opportunities for its users
Newpool multichain staking pool
Widest range of EOS-based Stablecoins offering
OTC trading desk for fiat trading
The list goes on......
The diverse and extensive product/service offerings from Newdex have truly created a One-Stop Service where users can enjoy the fullest benefit of their digital assets as well as opening the floodgates of OTC fiat trading. With this new service, it has empowered its users the flexibility to conduct trades with both blockchain-based and fiat assets.
For more information about Newdex please follow its official links below:
Website: https://newdex.io/
Twitter: https://twitter.com/NewdexOfficial
Medium: https://medium.com/@marketing_27690
Let's Connect!!!
submitted by rillita to eos [link] [comments]

Dxchain Whitepaper Explained SR-4

Dxchain Whitepaper Explained SR-4


By @cryptopreach

Hello Readers,
TodayI will be taking you through the fourth series of the Dxchain White Paper Explained. Previous series you can find this SR-1, SR-2, SR-3.
Overtime, Dxchain Project experienced a very considerable growth and it continually seeing the expected development. There are couple of announcements and release over the past weeks, all of which you can find on Dxchain Blog site. In discussion I had with @olivia -member of the Team, it came to my knowings there has been slight changes in the course of executing the whitepaper. This is due to continuous technological advancement together with external factors that might be about change in paradigm. This series is basically to walk you through the avenue at which Dxchain Utility token -DX operates.

DX Token And Its Usage.

What Is A Token?
There is a clear distinction between Blockchain and Cryptocurrency. Blockchain being "a well" where the water takes its source and "crytpocurrency" acting as what you need to fetch out the water in an amount you need for sufficiency. This basically explains the deep relationship between them. They both co-exist where one acting as the platform and another what is built upon it. Blockchain has a distinctive nature which uses a tokenized transactions which are referred to as cryptocurrencies.
A cryptocurrency token is a store of asset value, and what asset is being represented varies wildly based on the blockchain. In a vanilla blockchain like Bitcoin, the cryptocurrency BTC represents financial value. In a commodity-backed blockchain like Hempcoin, the cryptocurrency THC represents industrial hemp. 
DUAL-TOKEN BLOCKCHAIN
There exist blockchains that use Dual-token system such as NEO/GAS. While NEO serves as the digital security token, GAS's usability is to power tokenized transactions on the NEO network. Ethereum as a blockchain supports development of additional or dual cryptocurrency tokens. Projects like EOS, VeChain, TRON etc started as Ethereum-based tokens before they moved to a self-hosted blockchain. This brings me to differentiating between a TOKEN and a COIN. Ethereum chain supports other coins which is why it has different token protocols referred to as `Ethereum Request For Comment (ERC) Standards.`Some of the known ERC standards are ERC-20, ERC-223, ERC-721(used for non-fungible crypto collectibles like CryptoKitties) etc

Difference Between A Token And A Coin.
Coins are digital money, created using encryption techniques, that store value over time. Basically it is a digital equivalent of money. The major characteristics of a coin is that: they are fungible, divisible, acceptable, portable, durable and have limited supply. Example of a coin is Bitcoin, LiteCoin, Ripple etc. In contrast, according to the medium article here ,
Tokens are digital assets, issued by the project, which can be used as a method of payment inside project’s ecosystem, performing similar functions with coins, but the main difference is that it also gives the holder a right to participate in the network. It may perform the functions of digital asset, represent a company’s share, give access to the project’s functional and many more — with the launching of new projects unknown facets of tokens’ functional are discovered. Token-hosting platforms like Ethereum created a divide in crypto in which the term “coin” is used to describe self-hosted cryptocurrencies like Bitcoin, while “token” is used to describe proprietary tokens hosted on third-party blockchains.

What Is DX Token?


DX Token

According to Dxchain Whitepaper, DX is a non-refundable functional utility token which will be used as the unit of exchange between participants on the DxChain Network. The goal of introducing DX is to provide a convenient and secure mode of payment and settlement between participants who interact within the ecosystem on the DxChain Network. DX is an ERC-20 standard compatible token. That is, It is initially created on the Ethereum network and can be stored using wallets with same compatibility.

It is to be noted that DX is proposed to be in a native currency of the platform which can only be on the self-owned blockchain. Recently, Dxchain launched mainnet-alpha - a development showing that Dxchain will own a native cryptocurrency sooner. This, usually brings about swapping of token with the native currency of the platform.

Dxchain completed her sales long ago, now listed and trading on several exchanges thus: Bilaxy, Kucoin , Gate.io, IDEX Coinsuper,Bgogo. For token statistics (supply, M.cap etc), see coinmarketcap.


What Is The Use Of DX Token?

DX is a major component of the ecosystem on the DxChain Network, and is designed to be used solely as the primary token on the network.. The primary usage of DX is for interaction among the participants of DxchainNetwork. For instance, Dxchain being a decentralized storage platform needs a convenient way of sealing transactions for justify the advantage of using the platform for effective cost control using cloud service hence DX will serve the purpose of this.

It will be used a means of incentivizing members of the newtwork. Quoted here, DX is required as virtual crypto “fuel” for using certain designed functions on the DxChain Network, providing the economic incentives which will be consumed to encourage participants to contribute and maintain the ecosystem on the DxChain Network. DX is a vital and integral part of the ecosystem as it serves as a means of incentives to get participants engaged in the network.

DX is also required for the smooth validation and verification of additional blocks on the Dxchain. The providers of such services on the Network would require payment for the consumption of these resources (i.e. ”mining” on the DxChain Network). Lastly. the utility of DX is also to maintain network integrity. It will serve as the unit of exchange to measuring and payment for the costs of the consumed computational resources on the chain.


Resources
Reference 1
Reference 2
Website
Telegram
Reddit
submitted by Bobelr to DxChainNetwork [link] [comments]

Atomic Swap with USDT: Swap Online solution in two hundred lines of code

Atomic Swap with USDT: Swap Online solution in two hundred lines of code
https://preview.redd.it/3mx7amtio9g11.png?width=696&format=png&auto=webp&s=f2bd956843196fa2f51048a86f9608b6e714f62e
On the eve of the release on the mainnet, the team of the cross-chain wallet Swap Online is publishing a research study and the code of the atomic swapusing USDT.

USD Tether — the equivalent of the dollar on Omni Layer

The solution described above with the protocol “over” the Bitcoin network gave life to one of the most controversial cryptocurrency projects of the last two years — Tether. Tether (symbol Tether — ₮, ticker — USDT) is a hybrid cryptocurrency with a rate binding to one US dollar. Moreover, according to the assurances of Tether Limited, the issuer of the given tokens, the “binding” is to be understood literally, as each purchased token of USDT corresponds to one US dollar available at the disposal of the company.
If we take the three largest exchanges based on their daily turnover of transactions at the time of writing (Binance, OKEx and HuObi), and then track the five most popular trading pairs for each, we will encounter USDT in 13 out of 15 cases.

USDT — the token with the largest capitalization in the world.

All this generates great community interest in faster, safer and cheaper solutions for exchanging Tether into other currencies. Obviously, such a solution could be atomic swaps, which are instant, decentralized cross-chain exchanges. The Komodo laboratory, the main headliners of this technology, who presented it in the autumn of 2017, reported on the successful exchange of KMD to USDT carried out on the BarterDEX platform, Komodo’s own exchanger.
https://preview.redd.it/z7tx3cv0p9g11.png?width=597&format=png&auto=webp&s=f0944434f691d69ae45c5b80e00fed2736423f7a
At the same time, according to our data, the developers of Komodo made a swap on the ERC20-a version of Tether, which is only available in 3% of cases. Approximately 60 million USDT from global turnover can thus be exchanged using this method, which, obviously, cannot be considered as a solution to the problem. Striking examples of imperfections of existing solutions can be found even on Etherscan.
https://preview.redd.it/39nc2ji6p9g11.png?width=800&format=png&auto=webp&s=992a4adc022175d90d111f030047ba8adeda14f8
This fall, the team of Swap Online is ready to present an atomic swap with Tether. And here’s how we did it.

How Omni conducts transactions

To carry out the Omni transaction, a user needs to create a regular Bitcoin transaction-transfer of 546 satoshi (minimum) with an additional output storing payload using the OP_RETURN op-code. An example of such a transaction. The payload is a mandatory part of any Omni transaction, as it is a sequence of bytes containing all the necessary information about the transaction.

Let us consider what information is stored in the payload itself

transaction marker — 4 bytes, the mandatory part of any Omni payload is always equal to 0x6f6d6e69 — ASCII code omni. If the first 4 bytes of the sequence are not equal to 0x6f6d6e69, then this sequence is not a payload of Omni.
version — 2 bytes, an analog version of the transaction in Bitcoin. For the described algorithm to work, version 0 is used, or that is the same as 0x0000.
transaction type — 2 bytes, transaction type, for an atomic swap it is sufficient to use only “Simple send” transactions, as simple send is the usual sending of omni currency from its address to the address of the recipient. Simple send corresponds to the transaction type code 0, that is, the next 2 bytes 0x0000. Other possible types of transactions exist in Omni.
token identifier — 4 bytes, identifier of the currency used. For example TetherUS has the identifier 31 or 0x0000001f. All tokens created by the Omni protocol at this time can be seen via the following link.
amount — 8 bytes, for a transaction of type Simple send, this is the amount of the sent currency.
As you can see, payload does not store the addresses of senders and recipients of the transactions, these addresses are determined by the Bitcoin transaction in which the payload output was detected. By scanning inputs, the Omni protocol determines who makes the transfer by finding the output of the corresponding address from among the inputs of the transaction p2pkh.
Thus, for a transfer from Alice to Bob of, for example, 50,000,000 TetherUS, we need to create a Bitcoin transaction where one of the inputs will refer to the p2pkh output corresponding to the Alice address. It is also important that this entry be the first in this transaction (the index of this entry in the received transaction would be is minimal or none at all). One of the outputs of this transaction should be the output of p2pkh to Bob’s address, and another output must have been one of the outputs with the following payload:
https://preview.redd.it/0kmuzds8p9g11.png?width=575&format=png&auto=webp&s=af2f496596684af18091fb044f4e20b7e546c32f
Example 1
Example 2

Atomic Swap on Omni Layer

Suppose that Alice and Bob are willing to make an inter-blockchain exchange of cryptocurrencies. Alice wants to exchange the units of any Omni currency, for example TetherUS (the given currency has the currency identifier # 31 in the Mainnet, then in the text we will only talk about this currency of the Omni protocol, since it is the most popular at the moment, but the algorithm below will work for any currency of the Omni protocol as well) for b units of a cryptocurrency working on another blockchain. (Omni works on top of the Bitcoin blockchain, of course, according to the algorithm below it is possible to exchange TetherUS for Bitcoins, but due to their work on one and the same blockchain, this exchange can be done in a different, more efficient way).

Glossary

A — blockchain of Bitcoin.
B — the blockchain of the cryptocurrency for which TetherUS is being exchanged.
a — the sum of TetherUS, which Alice wants to exchange.
b — the sum of the cryptocurrency of the adjoining blockchain B, to which Alice wants to exchange her a TetherUS.

Creating a Transaction

1) Bob generates a random value secret.
2) Bob calculates the secretHash by performing the following operation: secretHash = RIPEMD160 (secret)
3) Bob creates and sends an htlc transaction sealed by secretHash
4) Bob sends Alice a secretHash value, and a hash of the hrlc transaction he created in the previous paragraph in order for Alice to make sure that the correct htlc transaction is actually present in the B blockchain.
5) Alice received from Bob the secretHash and hash of the htlc-transaction Bob created, and is convinced that such a transaction is really present in the B blockchain, and that this is indeed a htlc-transaction sealed by the secretHash value.
6) using the received secretHash, Alice creates the following transaction and translates it into the Bitcoin blockchain:
https://preview.redd.it/oxri5a7gp9g11.png?width=735&format=png&auto=webp&s=14e88db4fc4d1743406939343d42e33352b05782
Let us call such a transaction financing_tx. In fact, it is almost an ordinary Bitcoin htlc transaction that is used in atomic swap with the only difference that in the amount field, 546 satoshi is the minimum number of Bitcoins that can be at the output of the transaction, below this value, Bitcoin counts the transaction as dust and does not conduct it.
7) Alice creates a transaction according to the following scheme:
https://preview.redd.it/awz9uzuhp9g11.png?width=1000&format=png&auto=webp&s=9ca79e77ca6aff631a39ae95dfaa70aa06d695ec
Let us call this transaction redeem_tx. Alice creates such a transaction with two inputs: the first is the input referencing the output of funding_tx, which contains the htlc script. Alice does not sign this script, that is, the SigScript field remains completely empty. The second input is the input referring to any unspent exits of Alice, the main condition is that at this output stage there are enough Bitcoins to pay the transaction fee, and this entry is signed by Alice with her private key with the signature type SIGHASH_ALL (that is, she signs the entire transaction except for SigScript fields on the inputs transaction, which makes this transaction immutable. The outputs of the same transaction are the elementary Simple Send and a TetherUS from Alice to Bob (details of what Simple Send, payload is and how it works can be found in another section).
8) Alice sends Bob the redeem_tx created in the previous paragraph and the one she signed herself.
9) Bob got the redeem_tx sent by Alice, checks it, just looks through the inputs and outputs, making sure that this is really a transaction that Alice should have created using the real algorithm. After that, Bob signs the transaction with his private key and provides the secret value in the SigScript of the corresponding redeem_tx entry.
10) Bob sends the signed redeem_tx transaction to the blockchain, thereby transferring the TetherUS currency from Alice to himself. Note — before carrying out this step, we still need to check that Alice’s address has the necessary amount of TetherUS.
11) Alice looks through blockchain A and gets the value secret and uses it in the B blockchain to transfer the funds using the htlc transaction Bob created in point 3. The exchange ends here.
Stating the obvious: naturally the timelock value used by Bob when creating the htlc-transaction must be significantly longer than the timelock that Alice uses, since her htlc transaction should be spent earlier than the htlc created by Bob. This is necessary so that Bob cannot manage to spend both htlc.

Conclusion

Thus, connecting Omni Layer to Swap Online allows users to cover transactions.

Full research you may find in our Github

C++ source code for creating TX
C++ source code for redeem TX

Swap.Online Essential Links

Website: https://testnet.swap.online GitHub: https://github.com/swaponline Email: [email protected] Telegram: https://t.me/swaponline Facebook: https://www.facebook.com/Swaponline Twitter: https://twitter.com/SwapOnlineTeam Wiki: https://wiki.swap.online/ Bitcointalk: https://bitcointalk.org/index.php?topic=4636633
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