Buy and sell currencies – Debates and Help

To buy and sell currencies, a Forex trader needs a good means of trading and the broker is the medium in exchange operations. Before selecting our agent, we should check several things from that agent to obtain adequate facilities and security from them. FXdirects is an honest and safe operations broker in this challenging market and they have been operating in this market for many years. I never face any re-quote or slip problem during my operation.

of currencies – Obtaining cash in USD in Munich in cards of the United Kingdom

There are at least ATMs at the airport where you can receive cash payments in US dollars and I'm relatively sure that ReiseBank has an ATM in the main train station, which can also deliver you notes in US dollars.

However, I do not assume that this is the cheapest solution. The German ATM operators noticeably hide all kinds of strange fees and I would expect that if you try to make a payment in US dollars in a German ATM from a UK card, the ATM operator will convert the amount in US dollars to Euros at a low exchange rate. and then load your card in EUR and not directly in US $.

The change of currency in regular banks is often only provided to bank customers and is also usually quite expensive. The most prominent exchange offices, eg. Western Union or ReiseBank do not offer very good exchange rates either. I guess the best solution is to get EUR with your card from an ATM and then go to any of the smaller independent exchange offices. Many of them are located in the area south of the main train station between Bayerstra├če and Schwanthaler Stra├če.

probability – What is the correct mathematical answer for a cryptographic hash function like in digital currencies?

Most tutorials on digital currencies (such as BitCoin) say that a hash function is a cryptographic function that takes an input and always returns a binary string of length $ 256 $ in such a way that a small change in the input would result in a totally different hash.

Obviously, in the simplest interpretation, the hash function must be injective. However, since the length of the incoming messages is unlimited while there is only $ 2 ^ {256} $ binary strings, it is obvious that an injective function can not exist.

So, what is the correct interpretation? I tried to formulate a possible interpretation and I looked it up in Google to see if there is a real mathematical definition of the hash function as in the BitCoin tutorials, but I had no luck.

Anyway, here is my interpretation:

Leave $ mathcal {M} $ denotes the set of messages. We can think of this set as binary strings of unlimited length, that is, $$ mathcal {M} = Large { large (a_1, a_2, a_3, cdots, a_n, cdots) large mid a_i = 0,1 ( forall i in mathbb {N}) Large } $$ We can define a distance in this set as follows:

$$ d (m_1, m_2) = sum_ {i = 1} ^ { infty} frac {a_i} {2 ^ i} $$

Then the statement becomes something like this:

$$ forall m_1 in mathcal {M}: , , mathbb {P} ( {{f (m_2) | f (m_2) neq f (m_1) }}) = 1 – frac {c} {2 ^ {256}} $$

Where $ mathbb {P} $ It is the uniform distribution in the set of binary chains of length. $ 256 $ Y $ c $ it's a constant that $ c ll 2 ^ {256} $. For example, $ c leq 2 ^ {10} $.

Are there alternative interpretations? A formal definition maybe?

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By

blockchainerz

Facebook, is a social network based on Web2 that has 2.4 billion active users, has recently announced a change to Web3. The medium "Facebook launching a cryptocurrency" is being introduced. The reality is more complex. Facebook plans to launch its own distributed ledger, token, Libra, and Calibra's wallet manages a native token. Libra It is assumed that through the back door of this portfolio, the company is making a move to govern the future of providing global sovereign digital identities. Facebook users will be able to use the Libra tokens for online purchases and P2P remittances through that wallet for "low to none" rates. The technical document indicates that Libra, a stable token, is backed by several fiduciary currencies. It would be competition for state-of-the-art technology providers and credit card companies. It could be a token that charges merchants as much as 2.5 percent or more in purchases. In addition, it could compete with money transfer companies that many expatriates around the world use to send funds to friends and family in their home countries.

Key elements of the Libra Network:

Infrastructure

Libra runs in a federated authorized and distributed ledger, as a security mechanism. That does not use a "chain of blocks". Security is established through legal contracts between known actors of that federated network. However, a time-stamped block chain is very important without empowerment networks like Bitcoin or Ethereum. Where validators can join and leave the network at any time, without permission.

Consensus

An authorization system is executed from Libra. You can use a more productive consensus algorithm that does not need batch transactions. Because transaction history is much less likely to work in a configuration of trusted network actors. Libra uses a modified version of Practical Byzantine Fault Tolerance (BFT), an experienced and well-known algorithm. LibraBFT seems to be a bifurcation of the consensus protocol of hot things.

Smart contracts

The Libra network is delineated with intelligent contract capabilities. "Move" is the vernacular intelligent contracting language. The question of whether it makes sense to develop a new language without solving. It is still unpredictable how the language is rich in functions and user-friendly for the developer. Both aspects would influence the problems of the security of intelligent contracts and the resistance of the network. Like Ethereum, Libra's smart contracts will have mandatory network payments to execute the code. It means that all operations require the payment of Libra as network transaction fees.

Governance of the Network

As an authorized general ledger, only members of the network can validate transactions. "The founding members are consortiums with established reputations, which makes it unlikely that they act with malice," says the white paper. These activities range from traditional payment networks. "(Mastercard, Visa) for the Internet giants and concert economy (eBay, Lyft) to block the natives, (Xapo) for VCs (Andreessen Horowitz, Thrive Capital)". Another range of participation nodes from NPO to Paypal, Uber, Women & # 39; s World Banking, Mercy Corps, etc. The Libra Association is based in Geneva, Switzerland, with almost 30 interested parties so far.

conclusion

Facebook is planning to launch a cryptocurrency. It is expected to "transform the global economy". As seen in the ongoing speech of Facebook with the CFTC. The era of unregulated digital assets has come and gone: ICOs currently increase 58 times less than a year ago, while STOs increased 130% in the first quarter of 2019.

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Wallet: how to create generation addresses for various crypto currencies

I am trying to understand how to generate 1 mnemonic addresses for multiple cryptocurrencies.

I needed a read-only wallet, so I think I need to use a xpub key. But I am struggling to understand the structure of the wallet tree and how to achieve it.

So far I can do this.

const bip39 = require (& # 39; bip39 & # 39;)
var HDKey = require (& # 39; hdkey & # 39;)


const mnemonic = bip39.generateMnemonic ()
const seed = bip39.mnemonicToSeedSync (mnemonic) .toString (& # 39; hex & # 39;)
let hdkey = HDKey.fromMasterSeed (Buffer.from (seed, & # 39; hex & # 39;))
var childkey = hdkey.derive ("m / 0/0/1")
console.log (childkey.publicExtendedKey);

leave publicExtendedKey = hdkey.publicExtendedKey;
hdkey.publicKey

My requirement is that a user can save 1 mnemonic on their side, and I have a public key with which I can generate addresses for multiple cr

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Bitcoin declined more than 10% today, falling to almost $ 7,500 as the broader digital currency markets experienced a decline.

At this point, the cryptocurrency had lost approximately 12% in the last 24 hours and more than 17% from its recent peak of almost $ 9,100, as revealed by the additional CoinDesk figures.

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Bitcoin declined more than 10% today, falling to almost $ 7,500 as the broader digital currency markets experienced a decline.

At this point, the cryptocurrency had lost approximately 12% in the last 24 hours and more than 17% from its recent peak of almost $ 9,100, as revealed by the additional CoinDesk figures.

They are offering the best bitmex bot, as you can see in the previous image, #TRX orchestrating the continuous gain.

18% profit in #TRX of a scalping operation generated through Bot.

Just configure it once and enjoy the lifetime gains.

These are extraordinary and constant benefits. Let the automated trading strategy get benefits for you in Bitmex.

What is the point of trading too many currencies when you get constant profits from the best strategy produced for Bitmex?

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How do I get the inflation rate for cryptographic currencies in csv format?

I am interested in doing an econometric analysis of cryptographic currencies and yields based on the inflation rate. Any csv file that has all the currencies and the inflation rate? Thank you.

Is there a way to trade digital currencies locally after the ban on local currencies? [on hold]

I can not find local btc merchants at localbitcoins.com.
Is there any way to buy bitcoins locally, since I am in a country where exchanges do not allow me to buy btcs from Syria?

Is there a bitcoin scanner that can visualize where currencies flow from one direction to another?

I remember playing with a bitcoin explorer tool a while ago, where you can enter a bitcoin address and see all the currencies flowing in a tree-like structure. I want to be able to investigate where the coins come from. What is this tool?