Buying Gold and Silver Bullion with Bitcoin / Crypto ...

Buying Gold and Silver with Bitcoin

Buying Gold and Silver with Bitcoin

Since it was established in 2008, Bitcoin has provided consumers with another way to pay for various purchases. Although Bitcoin may not be considered "mainstream" at this point, the digital currency has gained significant popularity in recent years and is becoming accepted by more retailers and merchants.

Bitcoin may be...

Read more


Website: silver.com

Creating an Electrum Wallet – Bitcoin Electrum

Creating an Electrum Wallet

Before you begin

You will need to download and install electrum first. You can download it from here . If you are on Windows you should use the installer version and not the portable one.

You will need a pen and a notebook (recommended) or piece of paper to write down the seed mnemonic. The notebook will have to be kept somewhere safe once you are done with the...

Read more


Website: https://bitcoinelectrum.com

Related topics : bitcoin wallet address electrum / create a new bitcoin wallet / create a bitcoin wallet address / create a paper bitcoin wallet / create a bitcoin wallet

List of Exchanges and Wallets Supporting Bitcoin Cash

List of Exchanges and Wallets Supporting Bitcoin Cash

Own rights

" data-medium-file="http://www.altcointoday.com/wp-content/uploads/2017/08/Bitcoin-cash-support-300x188.png" data-large-file="https://i2.wp.com/www.altcointoday.com/wp-content/uploads/2017/08/Bitcoin-cash-support.png?resize=960%2C600" class="aligncenter size-full wp-image-40971"...

Read more


Website: http://www.altcointoday.com

Wallet ColdStorage - Bitcoin.com.au

How to Protect Your Backup Seeds

What is a Trezor and a Cryptosteel?

Security: Trezor  has been designed to protect your private keys from malware, virus' and phishing. Compared to other alternatives , they are the most secure way to protect your bitcoins. 

Portability: Trezor is small and easy-to-use. It can be connected to any Windows, Linux or Mac machine as an external device. You can use...

Read more


Website: bitcoin.com.au

CoinBank-Safe Bitcoin Wallet

Download APK

What is Bitcoin?

Bitcoin is a form of currency, created and held electronically. It is the first decentralized peer-to-peer payment network that is powered by its users with no central authority or middlemen and offers complete transparency with miniscule transaction fees. They're produced by people all around the world, solving complex mathematical problems.

Why CoinBank ?

HD Wallet

Unlike old-style Bitcoin wallets, which generate new Bitcoin addresses and private keys randomly as needed, in a Hierarchical Deterministic (HD) wallet, all the data is generated...

Read more

Date: 2017-03-13 09:44:54
Website: http://www.coinbank.info

Related topics : bitcoin wallet private key generator / bitcoin wallet address private key / bitcoin wallet private key backup / bitcoin wallet address generator / create a new bitcoin wallet

Validation - Bitcoin Core Features

Bitcoin Core

Direct theft

Alice deposits 100 bitcoins to Bank.Example.com. The next day, the owners of the site disappear with Alice's money.

Bitcoin bank users are vulnerable to direct theft because they don't control their own private keys.

Lightweight (SPV) wallet users and Bitcoin Core users are not vulnerable because they control their own private keys.

Direct theft is likely the leading...

Read more

Date: 2018-01-29 16:13:25
Website: https://bitcoin.org

BitcoinMarkets Slack

Why we require a signature to join

Unfortunately we have been forced to take steps against spammers sending phishing attacks.

Signing a message with your bitcoin address proves your ownership. In effect it becomes expensive for spammers to create fake accounts.

FAQ

Does it cost me anything to sign a message?

No. Signing a message doesn't cost anything.

Is it safe to sign a...

Read more

Date: 2017-11-12 11:07:23
Website: https://signup.bitcoinmarkets.co

Related topics : create a bitcoin wallet address / bitcoin wallet address / bitcoin address ???? / bitcoin address / bitcoin wallet sign up

What Are Bitcoins and How Do They Work? - Lifewire

by Paul Gil

Updated December 19, 2017

Bitcoin -�the initial virtual banking currency�of the internet -�has existed for several years now and many people have questions about them. Where do they come from? Are they legal? Where can you get them? Why did they split into Bitcoin and Bitcoin Cash ? Here are the basics you need to know.

Cryptocurrency Defined

Cryptocurrencies are just lines of...

Read more


Website: https://www.lifewire.com

Bitcoin Payments with Sources - Stripe

Bitcoin Payments with Sources

Use Sources to accept payments using Bitcoin, the popular digital cryptocurrency.

Stripe users in the United States can accept Bitcoin for USD payments from customers using Sources --a single integration path for creating payments using any supported method.

During the payment process, a Source object is created and your customer is given a receiver address to send...

Read more


Website: https://stripe.com

A Complete Guide to the MultiBit Bitcoin Wallet - Bitzuma

MultiBit is a popular Bitcoin wallet program that aims to combine fast startup times, a simplified feature set, and support for multiple languages.

Note: MultiBit is no longer supported . This post was written in 2014 and only slightly modified since then. It remains for those who may need to use MultiBit Classic, but should not be used by beginners.

This guide documents MultiBit through...

Read more

Date: 2017-12-19 17:18:45
Website: https://bitzuma.com

Bitcoin Price Today - Live Bitcoin Price Chart & History

1 oz Proof Bitcoin Guardian Commemorative Silver Round As low as : $29.22

Availability: In Stock

This product is in stock and ready for shipping. Expect shipment within 1 business day of cleared payment.

1 oz Antique Bitcoin Guardian Commemorative Silver Round As low as : $37.22

Availability: In Stock

This product is in stock and ready for shipping. Expect shipment within 1 business day of...

Read more


Website: jmbullion.com

Best Way To Buy Bitcoin Instantly With Credit/Debit Card ...

Best Way To Buy Bitcoin Instantly With Credit/Debit Card Without Verification

By ahmadderar on Author ahmadderar Posted on

November 24, 2017

One of the hot topics being discussed everywhere is the digital currencies. After 100% increase in the value of Bitcoin this month, more and more people are being attracted to this currency. About two years ago, people used to laugh at the person who wanted...

Read more


Website: https://www.ripplecoinnews.com

| Coinbase | How to create Coinbase account | Coinbase to add ...

Coinbase How to create Coinbase account Coinbase to add new coins - IOTA, Ripple, Bitcoin Cash, Monero, DASH

Bitcoin, safe and easy.

Coinbase is the world's most popular bitcoin wallet. We make it easy to securely buy, use, and accept bitcoin currency. Coinbase Bitcoin Wallet for Android has been designed from the ground up to to provide the best possible bitcoin experience on mobile.

Nearly 2M customers trust Coinbase, and more than 30k merchants accept bitcoin...

Read more


Website: youtube.com

Mastering Bitcoin – O’Reilly Media

Ownership of bitcoin is established through digital keys, bitcoin addresses, and digital signatures. The digital keys are not actually stored in the network, but are instead created and stored by users in a file, or simple database, called a wallet. The digital keys in a user's wallet are completely independent of the bitcoin protocol and can be generated and managed by the user's wallet software...

Read more


Website: http://chimera.labs.oreilly.com

Bitcoin Is Creating A New Class Of Millionaires – Return ...

FuriousFerret

That ship has sailed.

Just buy one. I read it's basically a lottery ticket, it will probably be worth nothing, but if it hits it hits big.

0

November 29, 2013

Jim

Yeah, all mining is ASIC-based now. CPU mining died years ago and GPU mining was stone dead months ago.

0

November 29, 2013

Jim

Yeah, all mining is ASIC-based now. CPU mining died years ago and GPU mining was stone dead...

Read more


Website: http://www.returnofkings.com

How to Get Bitcoin - Blockchain.info

SIMPLE. SEAMLESS. SECURE.

CREATE A BLOCKCHAIN WALLET

All you need is a verifiable email address to get started. CREATE YOUR FREE WALLET NOW

SET UP AN EXCHANGE ACCOUNT

Once you've created your wallet, navigate to the 'Buy Bitcoin' tab to set up an account with one of our integrated exchange partners. If...

Read more


Website: blockchain.info

Related topics : buy bitcoin exchange india / buy bitcoin exchange / buy bitcoin wallet india / buy bitcoin wallet / create a bitcoin wallet address

Bitcoin: How to get it in on the action with your mobile ...

Bitcoin's a big deal these days, and not just for arms dealers. Here's how you can get in on the action using your Android

Bitcoin is all the rage right now. It seems you can't go a day without seeing a Bitcoin article splashed all over the tech press--and, increasingly, the national papers. And that's not a surprise as Bitcoin seems to be the first digital currency that may stick around, and...

Read more


Website: http://www.knowyourmobile.com

Upgrade Your Bitcoin Security with a Multi-Signature Wallet

A multi-signature wallet requires several private keys to authorize bitcoin transactions. The multi-signature bitcoin address structure lets you splits those private keys across multiple devices or among multiple people. You choose how many devices or people ("copayers") you will share the wallet with. You also choose how many copayers need to sign off on a transaction.

For example, you can...

Read more

Date: 2017-12-20 06:28:34
Website: https://blog.bitpay.com

Related topics : bitcoin wallet address private key / bitcoin wallet private key backup / make a secure bitcoin wallet / create a bitcoin wallet address / setup a bitcoin wallet

How to make a Bitcoin Offline Transaction | CryptoCompare.com

How to make a Bitcoin Offline Transaction

Antonio Madeira

28 Sep 2017

If you're using it correctly, Bitcoin is as safe as it gets. As long as you are in control of your private keys, hackers have little chance of targeting your specific wallet for a theft, since your private keys are not stored in some central database with others. However, it is still possible to fall victim to attack. Whether...

Read more


Website: https://www.cryptocompare.com

Related topics : bitcoin wallet address private key / how to make a bitcoin wallet offline / bitcoin wallet address electrum / make a bitcoin wallet address / get a bitcoin wallet address

Mastering Bitcoin, Chapter 2: How Bitcoin Works - Atlas Beta

blockr Block Reader

Each of these has a search function that can take an address, transaction hash, or block number and find the equivalent data on the bitcoin network and blockchain. With each example, we will provide a URL that takes you directly to the relevant entry, so you can study it in detail.

Bitcoin Overview

In the overview diagram shown in Figure�2-1 , we see that the bitcoin system...

Read more


Website: http://chimera.labs.oreilly.com

BitcoinCollector – Earn free bitcoins

The easiest way to get free bitcoins.

Just enter your bitcoins address below and press the button to start earning free bitcoins

Start collecting

The address you provided is not a valid bitcoin address!

By clicking the "Start collecting" button above, you agree to the Terms of Service and Privacy Policy .

Please note that some sites are using coinbox.me in...

Read more


Website: http://www.bitcoincollector.net

Related topics : ways to earn bitcoins for free / ways to get bitcoins free / easiest way to get bitcoins free / get a free bitcoin wallet / free bitcoin earning sites

FBI on Bitcoin,between cybercrime opportunity & digital ...

May 11, 2012� By� Pierluigi�Paganini

Law enforcement, FBI first, are worried by the diffusion of the Bitcoin network that could be used by groups of criminals for several activities. The main problem related to the payment system is that is completely anonymous making impossible to trace the transitions and related users.

Bitcoin is a decentralized electronic cash system that...

Read more


Website: http://securityaffairs.co

Best Indian Bitcoin Websites To Buy/Sell or Tra... - Best ...

Bitcoin in India is gaining momentum & unlike the old days, it's now legal to buy & sell Bitcoin in India. However, there is only a handful quality sites where you can buy & sell Bitcoin.

Here I'm listing down those Indian Bitcoin exchange websites that you can use to buy and sell Bitcoin. I have listed these websites based on their popularity & easy of use.

One thing that I have noticed with...

Read more


Website: https://bestbicoinwallet.quora.com

Electrum 3.0 is first Wallet to enable Bech32 SegWit ...

Last week Electrum 3.0 was released. The new version of the most popular Bitcoin wallet does not just support SegWit, but also uses the new address format Bech32.

Electrum 3.0 could be one of the most interesting upgrades of the popular wallet. It does not just migrate from Python3 to Qt5, but also supports SegWit as the first wallet with the native SegWit address format Bech32.

If you just want...

Read more


Website: https://btcmanager.com

Related topics : bitcoin wallet address electrum / bitcoin wallet address private key / bitcoin wallet address generator / create a new bitcoin wallet / create a bitcoin wallet address

LocalBitcoins.com: Fastest and easiest way to buy and sell ...

How can I change the language of the website?

The LocalBitcoins website is currently available in English, Spanish, French, Italian, Russian, Brazilian, Portuguese and Chinese.

You can change the language of the site from the footer, scroll down all the way to the bottom of the page and click the text next to the globe under the heading Services to see a dropdown of the languages on offer.

I've...

Read more


Website: https://localbitcoins.com

LocalBitcoins.com: Fastest and easiest way to buy and sell ...

How can I change the language of the website?

The LocalBitcoins website is currently available in English, Spanish, French, Italian, Russian, Brazilian, Portuguese and Chinese.

You can change the language of the site from the footer, scroll down all the way to the bottom of the page and click the text next to the globe under the heading Services to see a dropdown of the languages on offer.

I've...

Read more


Website: https://localbitcoins.net

How To Buy Bitcoin In Zimbabwe - BitcoinAfrica.io

How To Buy Bitcoin In Zimbabwe

Published

Tweet

Zimbabweans have been plagued by economic distress and periods of hyperinflation for almost two decades. As a result, Zimbabwe now has an unofficial multi-currency economy where US dollars, South African rands and British pounds are used in local commerce as the value of the�Zimbabwean�bond note, the country's current official legal tender, has...

Read more


Website: http://bitcoinafrica.io

7 Bitcoin Scams You Need To Be Aware Of - BTCMANAGER

by Alexander Lielacher

As the price of bitcoin has increased substantially over the last few years, so has the number of malicious individuals and organizations looking to take advantage of others in the Bitcoin community. Bitcoin scams are not a new occurrence as they have been around since the currency first gained some popularity. Today, however, there is a broad range of bitcoin scams that...

Read more


Website: https://btcmanager.com

If You're Transferring Bitcoin, Be Careful With QR Codes ...

Here is a story that makes me want to vomit.

I recently experimented with buying Bitcoin, and bought a relatively small amount. Not a huge amount, but enough to be extremely upset if I lost it.

And guess what, I almost did. Because of QR codes.

For a bit of background, here's how the Bitcoin buying process works. First you buy from an exchange. You're welcome to hold your Bitcoin on that exchange...

Read more


Website: https://www.lifehacker.com.au

Related topics : bitcoin address qr code / bitcoin wallet address check / get a bitcoin wallet address / create a bitcoin wallet address / make a bitcoin wallet address

Bitcoin mining: Can it be profitable in 2017? | finder.com.au

BUTTERFLY6

a4aef6d35da553583ff4a6ce6e772eb4683d8fbdc6e7eda75cf1a26b44f63135

This arduous process of randomly trying to find a number that gives the solution is what makes bitcoin mining such a computationally expensive process, and as more miners join the network, the harder it gets. As of November 2017, a regular home computer working alone, ie, not an application-specific integrated circuit...

Read more


Website: https://www.finder.com.au

Getting Your Bitcoin Wallet in Canada — Canada's Bitcoin ...

New to Bitcoin? Make sure you read the things you need to know about the Bitcoin Market in Canada. We've put all you need in this updated post!

Getting Your Bitcoin Wallet in Canada

edited November 27 in Bitcoins 101

The below was the best advice at the time in 2013. I recommend you read the following, which has the updated...

Read more


Website: https://coinforum.ca

Related topics : blockchain bitcoin wallet review / bitcoin wallet address blockchain / blockchain bitcoin wallet app / bitcoin blockchain wallet / make a bitcoin paper wallet

What Is Bitcoin: The MakeUseOf BitCoin Guide

1. Introduction

Cash is great.

There are no banks to worry about. No fees, no credit cards, no chance of having your identity stolen or your account frozen. You may not earn any interest, but you always have instant access to your money and you know exactly how much you have.

It's also great for when you need to give money to someone else. There's no forms to fill out or confusing account...

Read more


Website: makeuseof.com

MultiPoolMiner - the best miner helper software

last updated on 29/01/2018 - v1.22.11

INSTALLATION

Download the latest RELEASE (.zip package) from https://github.com/MultiPoolMiner/MultiPoolMiner/releases

Extract it to your Desktop (MultiPoolMiner will NOT work from folders such as "C:\Program Files\")

Make sure you have all pre-requisites installed/updated from the IMPORTANT NOTES section below.

Right-click on the (required) Start.bat file...

Read more


Website: https://multipoolminer.io

How to Buy Bitcoins with Credit/Debit Card Instantly ...

Instant

Get Bitcoins with a Credit/Debit Card at Coinmama

You would need to�create your account and fill out your personal information to be able to trade in Coinmama .

After the profile completion, click "Buy bitcoins" in the navigation bar at the top of the page and set the bitcoin amount you wish to trade.

Next step would be to choose your payment method and to add your wallet address.

In...

Read more

Date: 2017-12-20 00:31:14
Website: https://bitcoinbestbuy.com

We’re Now Accepting Bitcoin on Dell.com - Direct2Dell

Due to low demand, Bitcoin is no longer available as a form of payment. Our apologies for any inconvenience this may cause. You can still complete your purchase through a number of alternative payment options such as PayPal, all major Credit Cards, and Dell Financial Services.

Now you can buy digital with digital - starting today, we're accepting bitcoin on Dell.com.

We're piloting bitcoin, the...

Read more


Website: https://blog.dell.com

Explained in 60 seconds - Investing In Bitcoin

Altcoin Analysis Tool

What is Bitcoin?

Put simply, Bitcoin is an online currency used for sending, receiving, and storing funds. Bitcoin does not rely on a centralized bank or corporation to faciliate the exchange of funds. Instead, Bitcoin is an open and decentralized community where all transactions are recorded in a public database that is...

Read more


Website: https://getstartedwithbitcoin.org

How to Earn Free Bitcoin - 7 Easy Ways to Make Bitcoin ...

How to Earn Free Bitcoin - 7 Easy Ways to Make Bitcoin Fast & Free Online in 2017

How to Earn Free Bitcoin - 7 Easy Ways to Make Bitcoin Fast & Free Online in 2017

By� Jude Umeano News � 2 Comments

If you are new to the world of Bitcoin/Cryptocurrency, one of the best ways to get acquainted with the Bitcoin technology is to own your first Bitcoin. We have highlighted 7 ways you can earn free...

Read more


Website: https://nigeriabitcoincommunity.com

Earn free bit coins BTC using script/bot. 1BTC=1100 ...

Earn free bit coins BTC using script/bot. 1BTC=1100$

Today on the request of many of the fans i finally decided to share my method to earn free Bitcoins BTC every hour.

As soon as virtual currency's price came up to 1000$ per BTC, people started showing their interest in eating free BTC.

Also if you are still stuck up at adf.ly+ hit leap thing, its time to gear up and earn more and better using...

Read more

Date: 2018-01-09 17:37:20
Website: http://frazytricks.blogspot.com

Related topics : earn btc for free / earn free bitcoins every hour / free bitcoin earning bot / earn free bitcoins bot / create a bitcoin wallet address

Beginners Guide – Bitconnect.Tools

Let's take it from the top and give you some background information

Getting Started With Cryptocurrency

Welcome to the start of your new and exciting journey, investing in, and making money from, the financial revolution that is Cryptocurrency. So you want to get involved? Good! there's never been a better time and no, you haven't missed the boat and no, you're not too late!

If you want to make...

Read more


Website: https://bitconnect.tools

A Beginner's Guide to the Electrum Bitcoin Wallet - Bitzuma

A Beginner's Guide to the Electrum Bitcoin Wallet

By Rich Apodaca | Updated

November 28th, 2017

Electrum is one of Bitcoin's most popular wallets. It uniquely walks the fine line between beginner usability and expert functionality. This guide introduces Electrum with step-by-step examples highlighting the most important beginner features. No previous experience with either Bitcoin or Electrum is...

Read more

Date: 2017-12-19 17:18:45
Website: https://bitzuma.com

How to create a Bitcoin wallet? – HashFlare Support

The two general types of Bitcoin wallets are offline and online.

Offline wallets store your bitcoins on a computer and they do not require an internet connection. However, such wallets require a lot of space on your hard drive and your constant attention (e.g. it is recommended to make backups weekly).

An online wallet requires you to...

Read more

Date: 2017-11-10 14:25:32
Website: https://hashflare.zendesk.com

Related topics : bitcoin wallet online or offline / create a bitcoin wallet offline / how to make a bitcoin wallet offline / create a bitcoin wallet online / offline bitcoin wallet

Bitcoin Offline Wallet - Bitcoin Fork Safety

* Make sure to save bitcoin address & private key in a Safe place. If you lose it there is no way to restore.

What is Bitcoin Fork?

There has been significant news coverage and developments in recent weeks about changes to digital...

Read more


Website: http://bitcoinfork.net

Related topics : bitcoin wallet address private key / how to make a bitcoin wallet offline / make a bitcoin wallet address / create a bitcoin wallet offline / bitcoin wallet address blockchain

Private Key, Public Key, Bitcoin Address and the Blockchain

Bitcoin is based on public key cryptography. This can be a confusing concept so this post explains the relationship between private keys, public keys, bitcoin addresses and the blockchain.

Public key cryptography

Cryptography is a way to secure information by encrypting it into an unreadable format called cipher text. Only the person with access to a secret key can decrypt the cipher text into a...

Read more


Website: https://bitcoinspakistan.com

Related topics : bitcoin wallet address private key / all bitcoin private keys / bitcoin wallet address blockchain / bitcoin address blockchain / all used bitcoin addresses

The Difference Between Cryptocurrencies and Digital Assets

In 2017, bitcoin has finally become mainstream and its global adoption is on the rise. But while bitcoin is now being recognised by most investors as a viable asset class, its quasi-legal status has led to regulators grappling with ways on how to integrate it within their current monetary structures. According to South African media outlet Moneyweb, one such regulator is the South African Revenue...

Read more


Website: http://bitcoinafrica.io

Western Union to Bitcoin | WU to BTC

Contacts

Western Union to Bitcoin

DEAR CUSTOMERS! FOR YOUR CONVENIENCE, PLEASE CONSIDER TO USE MORE LOYAL PAYMENT SYSTEMS SUCH AS MONEYGRAM OR RIA SYSTEM INSTEAD OF WESTERN UNION. MONEYGRAM AND RIA HAVE LOWER COMMISSIONS AND PROCESS FASTER.

You Send

Auto exchange on most directions

Simple

More than 93 people were interested in exchange for last 24 hours.

Last order for exchange was 2000 Western...

Read more


Website: https://cryptex24.com

How can one mine Bitcoins? What are the investment returns?

Updated 3w ago

The process of creating bitcoins is called 'mining' of bitcoins. Bitcoin is a cryptocurrency i.e. based upon digital cryptography, therefore bitcoins are not available in any physical form that you can touch and feel. Bitcoins are discovered by solving complex mathematical problems and then added to the distributed ledger called 'blockchain'. This blockchain holds the records of...

Read more


Website: https://www.quora.com

Bitcoin Wallet Kaise Banaye

Bitcoin Wallet Kaise Banaye

Thanks a lot for coming to The Unity Ingot in searching for "Bitcoin Wallet Kaise Banaye" online.

The Bitcoin took the world of financing by shock when its value increased by 15,000% within 4 years, as the cost each Bitcoin surged from $0.08 to $1,200! The underlying need for an independent electronic money, not managed by a central federal government which undergoes...

Read more


Website: https://bitcoinpools.net

Buy bitcoins fast and easily! | bit4coin

Click Redeem on this site

Input bitcoin wallet address or follow steps to create a new wallet

Enter the voucher code

Receive your bitcoins - ready for use!

Spend Bitcoin

Buy products and services with...

Read more


Website: https://bit4coin.net

Related topics : create a new bitcoin wallet / create a bitcoin wallet address / buying bitcoin fast / buy bitcoin fast / create a bitcoin wallet service

Buy bitcoins fast and easily! | bit4coin

Click Redeem on this site

Input bitcoin wallet address or follow steps to create a new wallet

Enter the voucher code

Receive your bitcoins - ready for use!

Spend Bitcoin

Buy products and services with...

Read more


Website: https://bit4coin.net

Related topics : create a new bitcoin wallet / create a bitcoin wallet address / buying bitcoin fast / buy bitcoin fast / create a bitcoin wallet service

BitPay – Secure Bitcoin Wallet

Stop storing your bitcoin on a website.

Not even BitPay can access your money.

Get real security by using a real wallet. Create a normal wallet for immediate payments, or lock down your security by requiring payments to be accepted by up to 12 different devices.

Websites get hacked, and insurance only covers "online" funds - often less than 10% of your money.

Trust that your payments are...

Read more

Date: 2017-12-18 14:59:28
Website: https://bitpay.com

Related topics : buy sell bitcoin fast / buy sell bitcoin app / buy and sell bitcoins online / buy sell bitcoin / get a bitcoin wallet address