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bitcoin обозначение The first half of the first step prevents transaction senders from spending coins that do not exist, the second half of the first step prevents transaction senders from spending other people's coins, and the second step enforces conservation of value. In order to use this for payment, the protocol is as follows. Suppose Alice wants to send 11.7 BTC to Bob. First, Alice will look for a set of available UTXO that she owns that totals up to at least 11.7 BTC. Realistically, Alice will not be able to get exactly 11.7 BTC; say that the smallest she can get is 6+4+2=12. She then creates a transaction with those three inputs and two outputs. The first output will be 11.7 BTC with Bob's address as its owner, and the second output will be the remaining 0.3 BTC 'change', with the owner being Alice herself.bitcoin ваучер x2 bitcoin bitcoin 3 sell ethereum bitcoin poker bitcoin take bitcoin магазины tether программа blake bitcoin cryptonight monero bitcoin foto

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One issue holding bitcoin back from wider adoption is the lack of businesses that accept the digital currency as payment. This is a chicken-and-egg problem. If more businesses had the ability to accept bitcoin, it might encourage consumers to start obtaining and spending it, and vice versa.

With this in mind, here is our guide to accepting bitcoin in a physical store.

Person-to-person payments
The easiest way to accept bitcoin payments is in-person, simply by getting your customer to send the correct amount of bitcoin (BTC) to your digital wallet. This is similar to thinking of it as a cash-in-hand payment.
This can be done via many smartphone apps, such as the Bitcoin Wallet app by Andreas Schildbach, on Android. There are also options available on the Windows Phone app store for users of that OS.

Some months ago, Apple removed all bitcoin wallet apps from its App Store. However, on 2nd June, the company rescinded this policy, once again paving the way for wallet apps on iOS devices. These are already starting to appear, with Blockchain, Coinbase and others apps now available. We can expect many more to arrive in coming months too.
Another alternative is CoinBox which is specifically designed for merchants wanting a straightforward option to receive payments. In these scenarios, the merchant enters the price of an item or service into the phone, which then presents a QR code containing the amount to be paid and the address the funds are sent to. The customer scans the QR code with their bitcoin wallet app and the payment is sent.

All of these simple systems are ideal for small businesses testing bitcoin acceptance or for those doing odd-jobs for small amounts. Businesses which are larger in scale will likely look into a dedicated solution that fits in with their existing POS systems.

Merchant bitcoin point-of-sale (POS) solutions
There is also a growing number of commerce-specific options that aim to streamline the process of taking bitcoin payments. The following services offer a variety of POS solutions for merchants, both online and off.

Coinify
Coinify, a Danish firm that acquired BIPS and Coinzone, offers POS solutions for both brick-and-mortar and online stores. Merchants can get paid in bitcoin or fiat currency – or a mixture of the two – and its mobile app, Coinify POS, works with both Android and iOS devices.
For online sellers, Coinify offers various integration tools, such as payment buttons, shopping cart plugins or hosted invoicing.

CoinKite
CoinKite is a new startup that offers a bitcoin payment terminal looking exactly like the over-the-counter chip-and-PIN terminals we are so used to using in stores today. This handset reads a bitcoin-based debit card, also offered by CoinKite. The handsets can also serve as a bitcoin and litecoin ATM, as well as offer the option to print QR codes for customers to scan with their smartphone apps.

CoinBase
Coinbase is another payment processor that provides a point of sale app (Android) for bricks-and-mortar retailers. While it currently only supports US bank accounts as a funding source, it offers extensive e-commerce support. Not only does it offer an HTML code segment for easily inserting payment buttons into your website, it also provides plugins for WordPress, WooCommerce, Megento, and ZenCart.

BitPay
BitPay is an international payments processor for businesses and charities. It is integrated into the SoftTouch POS system for bricks-and-mortar retail stores. However, BitPay has an API which could be implemented into any other POS system with some coding work. BitPay has various tariffs that merchants can subscribe to, enabling features such as using the service on a custom domain (for online stores), exporting transactions to QuickBooks, etc.

Blockchain Merchant
Blockchain have also produced a merchant app for Android devices. Blockchain Merchant promises instant transactions, 0% fees on payments and it has multiple linguistic versions for use around the world.

Revel
As mentioned in our recent report: “Revel Systems offers a range of POS solutions for quick-service restaurants, self-service kiosks, grocery stores and retail outlets, among other merchants. POS packages start at $3,000 plus a monthly fee for an iPad, cash drawer and scanner.” It was recently announced that Revel will also include bitcoin as a method of payment in its POS software.

BitXATM
Germany-based startup BitXatm has announced the arrival of its Sumo Pro – a cryptocurrency ATM with a POS (point of sale) function that will appeal to merchants seeking to easily accept payments from customers in digital currencies.

Costing €2,900 (around $3,993), the stand-alone machine offers a generous 17-inch touchscreen and has the ability to accept any fiat currency. Additionally, it can accept or dispense any digital currency, according to the company’s website.

Paystand
California-based online payment processor PayStand provides US-based websites and mobile applications another way to accept payments such e-checks, credit cards and bitcoin. Paystand have recieved $1m in investment as part of its initial seed-funding round.

Founded in 2009, PayStand aims to be a multi-payment gateway that eliminates merchant transaction fees, in part by supporting digital currency acceptance.

Coin of Sale
A new bitcoin POS system, Coin of Sale, is trying to make it easier for merchants to accept bitcoin payments for their goods and services.

Created by Singapore-based expat Thomas Forgac, Coin of Sale works with both Android and iOS devices. When users sign up for an account, they are automatically set up with an Electrum wallet.

The merchant must simply enter the amount of money that needs to be charged and the app will automatically generate a QR code for it. The customer then scans this QR code to complete the payment.

XBTerminal
XBTerminal

provides a bitcoin POS device that allows the merchant’s customers to pay from any mobile bitcoin wallet by NFC or QR code. Payment from offline mobile devices is supported by bluetooth. Payments take place through the company’s platform and, if desired, bitcoin can be converted instantly to fiat currency at the time of sale.

The company also provides web apps and an online interface for its payments solution for those that wish to invest in third-party hardware.

DIY
With bitcoin, it is possible to forego the fees of using a payment processor or provider, and simply integrate payments into your own custom system. Those with a technical background have achieved this, such as Stephen Early, who integrated bitcoin payments into the POS system of his UK pubs single-handedly.

Get noticed
Whether you have an online or a bricks-and-mortar store, if you accept bitcoin, you need to publicize the fact. You can find a ‘bitcoin accepted here’ sign at the bitcoin wiki.
A sign with more impact may alert customers to the fact you accept bitcoin. Cryptocables produces a range of neon and LED signage.

Additionally, Coco Mats ’n More offersitcoin-logoed doormats and ‘Bitcoin Accepted Here’ mats for merchants wanting to advertise the cryptocurrency as a payment option.



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The key to protecting yourself from data loss of any kind is to have redundant backups so that if one is lost or destroyed, you still have others you can use when you need them. All good wallet software asks their users to write down the seed recovery phrase of the wallet as a backup, so that if your primary wallet is lost or damaged, you can use the seed recovery phrase to restore access to your coins. If you have more than one backup location, they should be in places where various disasters won't affect both of your backups. For example, its much better to store two backups in a home safe and in a safe deposit box (as long as your seed is protected by a passphrase) than to store two backups in your bedroom and one in your garage.оплата bitcoin

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The approach to supply that Bitcoin has adopted is different from most fiat currencies. The global fiat money supply is often thought of as broken into different buckets, M0, M1, M2, and M3.7 M0 refers to currency in circulation. M1 is M0 plus demand deposits like checking accounts. M2 is M1 plus savings accounts and small time deposits (known as certificates of deposit in the United States). M3 is M2 plus large time deposits and money market funds. Since M0 and M1 are readily accessible for use in commerce, we will consider these two buckets as medium of exchange, whereas M2 and M3 will be considered as money being used as a store of value. As part of their monetary policy, most governments maintain some flexible control over the supply of currency in circulation, making adjustments depending upon economic factors. This is not the case with Bitcoin. So far, the continued availability of more tokens to be generated has encouraged a robust mining community, though this is liable to change significantly as the limit of 21 million coins is approached. What exactly will happen at that time is difficult to say; an analogy would be to imagine the U.S. government suddenly ceased to produce any new bills. Fortunately, the last Bitcoin is not scheduled to be mined until around the year 2140.8 Generally, scarcity can drive value higher. This can be seen with precious metals like gold.bitcoin dogecoin bitcoin greenaddress

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