Autor: blckfsh

Token(ICO) with huge potential – ƒilecoin A distributed data storage network

ƒilecoin

It is one of the first ICOs under the regulations recently approved by the United States.

The company intends to develop the project and has raised $ 52 million in a pre-ICO investor round.

The famous brothers Winklevoss have already invested in the project.

Practically you can only buy the coin. Minimize a coin = create money from home.
The mine will be more environmentally friendly because it requires less energy than mining other cryptones.
It is a Blockchain application a real problem. Critics often argue that Blockchain is “a solution looking for a problem.” In the case of Filecoin I can not say.

 

What is the project about?

Filecoin will be a distributed data storage system in which miners provide the space they do not use from their equipment to satisfy Filecoin’s “customer” storage requests.

What is the disruptive idea?

In the price of storage will be driven by supply and demand, not by departments of corporate prices, and competitive prices on factors such as reputation for reliability and price. In this way, customers who need to store their data will have a very personalized offer and adjusted in price.

 

When does the ICO start?

The next 7 of August.

 

Source

 

Anuncios

Que es Tether?

Tether le ofrece los beneficios conjuntos de la tecnología de bloques abiertos y la moneda tradicional al convertir su efectivo en un equivalente de moneda digital estable.

Acerca de Tether

Al aprovechar la tecnología Blockchain, Tether le permite almacenar, enviar y recibir fichas digitales vinculadas a dólares, euros y yenes persona a persona, global, instantánea y seguramente por una fracción del costo de cualquier alternativa.

¿Cómo funciona Tether?

Tethers existe en blockchains a través del Omni Protocol. El Omni Protocol es un software de código abierto que interactúa con blockchains para permitir la emisión y redención de fichas de criptoconversión, en nuestro caso, “ataduras”.

Tether Las monedas de la plataforma están 100% respaldadas por los activos en moneda fiduciaria reales en nuestra cuenta de reserva. Los Tethers son canjeables e intercambiables de acuerdo con los términos de servicio de Tether Limited. La tasa de conversión es de 1 dólar USD ₮ es igual a 1 USD.

La plataforma Tether está totalmente reservada cuando la suma de todas las correas en circulación es mayor o igual al saldo de la moneda fiduciaria mantenida en nuestra reserva. A través de nuestra página Transparencia, cualquiera puede ver estos dos números casi en tiempo real.

Para obtener una explicación técnica más detallada de cómo funciona la Plataforma Tether, descargue el papel blanco de Tether.

¿Qué monedas del mundo real soporta Tether?

Tether inicialmente soporta dólares estadounidenses (USD), Euros (EUR) y pronto Yenes japoneses (JPY). Representados por ₮, las monedas de la plataforma de correa se indican como USD ₮, EUR ₮ y JPY ₮.

¿Quién puede usar Tether?

Tether permite a las empresas – incluyendo intercambios, carteras, procesadores de pagos, servicios financieros y cajeros automáticos – utilizar fácilmente monedas fiat en block chains. Algunos de los negocios más grandes en el ecosistema digital de la moneda han integrado la correa.
Vea a los partidarios de la industria.

Los individuos también pueden crear una cartera Tether o usar plataformas habilitadas para realizar transacciones con cables.

¿Cómo protege Tether de la volatilidad de la criptografía?

Debido a que están anclados o “atados” a las monedas del mundo real.

Tethers son nuevos activos que se mueven a través de blockchain tan fácilmente como otras monedas digitales. Las monedas de tether no son dinero, sino que son fichas digitales formateadas para trabajar en blockchains. Tethers mantener su valor en 1: 1 a los activos subyacentes.

¿Cómo sé que mi Tether está seguro?

Tether está construido sobre la revolucionaria y criptográficamente segura tecnología de bloqueo abierto y se adhiere a la estricta seguridad y las leyes y reglamentos gubernamentales globales.

Todas las correas están vinculadas en forma individual con moneda fiat correspondiente (por ejemplo, 1 USD ₮ = 1 USD) y están respaldadas al 100% por los activos reales en nuestra cuenta de reserva. Como compañía totalmente transparente, publicamos un registro en tiempo real de todo el valor mantenido y transferido dentro y fuera de nuestra cuenta de reserva.

Los Tethers se pueden almacenar, enviar y recibir de forma segura a través de la cadena de bloqueo y se pueden canjear por dinero en efectivo (el activo subyacente) de acuerdo con los términos de servicio de Tether Limited

 

Fuente: https://tether.to/

Que son las ICOs

Que son las ICOs?

 

 

Esta infografía fue creada por DinarDirham. Toda la infografía aquí

Las fichas se venden a los inversionistas y enthisiasts por dinero o Bitcoin

Los eventos de la OIC tienen lugar antes del final del proyecto para ayudar al equipo de financiación con los gastos antes del lanzamiento

Los participantes de ICO se invierten en el éxito del proyecto y proveen la liquidez temprana de la moneda después del lanzamiento.

También obtienen el apoyo de otra adopción temprana de la moneda

ICO es una mezcla entre una donación y una inversión.

Se podría describir como poner el poder de crear nuevos proyectos o tokens digitales en las manos de la gente, en lugar de únicamente en los esfuerzos de una empresa.

Bancor completó exitosamente ICO que llevó a la compañía a casi $ 150 millones en las primeras tres horas. El crowdsale se convirtió en el más grande en la industria del blockchain.

Apenas unas semanas después del primer récord, una compañía más, Block.One, el desarrollador de la nueva plataforma de bloque de bloques EOS.IO, recaudó alrededor de 185 millones de dólares en los primeros cinco días de su ICO. Block.one tiene previsto distribuir un total de 1.000 millones de fichas y ya ha vendido el 20% de la criptoconversión.

ICOs en logística

La misión del proyecto IMMLA es una interacción simple, clara y conveniente entre el propietario de la carga y el transportista en todas las etapas del transporte de mercancías sobre la base de bloques de bloqueo de Etherium y contratos inteligentes. La nueva tecnología permite reducir drásticamente el déficit de confianza, las barreras de información y los costos legales.

La compañía de logística A2B Direct ha anunciado el inicio del ICO respaldado por Ethereum programado para el 12 de julio de 2017. La campaña que durará un mes tiene la intención de recaudar entre € 500.000 y € 3.000.000.

Comparación de las diferentes funciones en las diversas plataformas de”blockchain” que sostienen ICOs

Russia legaliza ICOs

El presidente Vladimir Putin se reunió con el creador de Ethereum Vitalik Buterin. “La conversación se llevó a cabo después de la reunión del Presidente con los jefes de las principales empresas extranjeras y asociaciones empresariales”, dice el sitio web oficial de Putin, y añadió que “el Sr. Buterin describió las oportunidades para usar las tecnologías que desarrolló en Rusia “.

-Después de leer todos estos artículos me pregunto si el potencial de las OIC está creando una carretera hacia el futuro de la economía

Fuentes:

https://www.coinspeaker.com/2017/07/20/logistics-using-blockchain-three-main-icos-of-july/
https://www.newswire.com/news/blockchain-multimodal-forwarder-immla-to-start-first-round-of-ico-with-19680569
https://www.coinspeaker.com/2017/07/04/logistics-company-a2b-direct-launch-blockchain-platform-ico-starts-july-12th/
http://www.altcointoday.com/russia-legalize-icos/
https://dinardirham.com/blog/initial-coin-offerings-ico-revised-edition/
http://www.altcointoday.com/russia-legalize-icos/

 

 

Propinas:

BTC: 1GVnCraoq5iXhTPt2zUSCrLPMdSLyEavgf

ETH: 0x8c98E0792dAe837cC20b051Fb07EB5D9267B387C

LTC address: LLUosZGm1xj66x5NCxq48j8vyLyEekYhe4

Top 10 free cloud mining sites – Get your cloud mining power – 2017

These sites give you free power (Mh/s or Gh/s). So that you can start mining for free
Just sign up an account then login it everyday and see your money is increasing.

1. Bitminer
Profit per minute: 40 Satoshi
Profit per day: 0.0006 Bitcoin
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2. Cryptostar
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8. Bitfire Mining

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9. Fleex

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10. FreeMiningBTC

Profit per day 0.00050000 BTC
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Que es Steemit?

Steemit es una red social que se ve y funciona mucho como Reddit, pero con una enorme diferencia:

Steemit paga tanto a los creadores de contenido cuando su trabajo se upvoted, así como las personas que curate el mejor contenido en el sitio por upvoting otros trabajo.

Esto es posible porque la plataforma Steemit está construida sobre un nuevo tipo de moneda digital. (Piense Bitcoin, que es otra clase de moneda digital que ha estado alrededor por un rato.)

Cada día, nuevas unidades de la moneda son creadas por la red y distribuidas a sus usuarios, que pueden intercambiar estas unidades monetarias digitales por dinero real real.

No cuesta un centavo para empezar.

Puedes crear una cuenta de usuario de Steemit de forma gratuita y publicar su contenido directamente en el sitio en cuestión de minutos usando las herramientas de publicación / publicación de Steemit.

Primero que nada hacemos una búsqueda para entender superficialmente que es Steemit

¿Cómo funciona Steemit?
En algunos aspectos, Steemit es similar a otras monedas digitales. Por ejemplo, las unidades monetarias de Steemit pueden ser negociadas, compradas y vendidas en el mercado libre al igual que todas las otras monedas digitales.

Con otras criptografías como Bitcoin, las unidades monetarias reales que se crean cada día se distribuyen a las personas que ejecutan un programa de software bitcoin especial en sus equipos que realizan un proceso llamado Bitcoin Mining. La cantidad de poder de computación que tiene dicta cuánto dinero obtendrá.

Steemit permite la minería de divisas, así, pero no es la principal manera de ganar dinero. Cada día, nuevas unidades monetarias de Steemit que son creadas por la red y distribuidas a las personas que se relacionan con el sitio. Cuanto más se involucre, más obtendrá.

Las personas que crean contenido son recompensadas por su contenido. Las personas que valoran el contenido son recompensadas por ayudar a curar el mejor contenido disponible en el sitio. Los comentaristas que agregan a las discusiones son pagados también.

Las 3 unidades monetarias de Steemit:
Lo primero que debe entender es que hay tres tipos diferentes de unidades monetarias de Steemit.

Tenemos Steem, Steem Power y Steem Dollars.

Confundir la derecha? Era para mi. Pero todo tendrá sentido en un minuto.

Steem:
Steem son las unidades que se compran y venden por dinero real en los mercados abiertos. Usted puede negociar como lo haría bitcoins o acciones de una empresa.

Pero usted no desea aferrarse a éstos por demasiado tiempo porque más unidades de Steem se crean cada día. Si usted se aferra a Steem Units por un largo tiempo, se diluirán y perderán valor.

Steem Potencia:
La propiedad de Steem Power Units es esencialmente como hacer una inversión a largo plazo en la moneda, ya que no puede vender Steem Power Units por 2 años. Pero hay muchas buenas razones para tener Steem Power.

Al mantener su moneda como Steem unidades de energía, usted será capaz de hacer mucho más dinero en el largo plazo, ya que esencialmente tienen la propiedad en la red. A medida que la red crece, también lo hará su pedazo del pastel.

Y serás muy recompensado en el camino. La forma en que se establecen las cosas ahora, el 90% de la nueva moneda Steem que se genera cada día se distribuye a las personas que ya tienen Steem Power Units en forma de Steem unidades adicionales. (El otro 10% va a creadores de contenidos y curadores).

La mitad del pago que usted recibe por su contenido estará en Steem Power Units.

Además, cuantas más Unidades de Poder Steem tenga, más contará su voto de censura. Usted tendrá más influencia en el sitio y también se le pagará más por upvoting trabajo de otras personas. (Cuando subes el trabajo de alguien, recibirán más dinero también.)

Steem Power Units también desempeñan un papel final y muy importante. Evitan los cambios masivos de precios y la volatilidad en los mercados abiertos. Debido a que todo el mundo está encerrado en 2 años, no todos podemos vender nuestra moneda de una vez si el mercado comienza a hundirse, lo que se bloquearía el precio si fuera a suceder.

Steem Dólares:
Steem Dólares son la tercera y última forma de la moneda y nunca se diluye o perder su valor. Están diseñados para ser una moneda estable que puede vender en cualquier momento. Cuando usted crea contenido popular, el 50% de su paga será en Steem Dollars.

Y usted será recompensado por la celebración de dólares Steem también. No es tanto como las recompensas por la celebración de Steem Power. Pero debido a que todavía mantiene la moneda en la red, la celebración de Steem Dollars paga un 10% de interés.

-Referencia:  https://steemit.com/@blckrbbt

Mejores Altcoins del 2017

Ethereum

J.P Morgan Chase, Microsoft e Intel se aliaron para crear el rival más feroz de Bitcoin en circulación hoy: Ethereum. El objetivo principal de la iniciativa era programar acuerdos vinculantes dentro de la cadena Blockchain. Esto encarnó en la ahora popular característica de contrato inteligente.

Curiosamente, Ethereum no es sólo una moneda. Es una plataforma Blockchain potenciada por la criptografía Ether. El New York Times describe la tecnología como “una sola computadora compartida que es dirigida por la red de usuarios y en la que los recursos son repartidos y pagados por Ether”.

Ripple

Ripple atrajo una gran cantidad de capital de riesgo durante su creación. El inicio de altcoin respaldado por Google logró atraer más de 50 millones de dólares de instituciones bancarias, reuniendo una impresionante cantidad de 90 millones de dólares en financiamiento total. Ripple es único en que permite realizar transacciones con cualquier unidad de valor, desde moneda fiat a millas de viajero frecuente.

“Ripple proporciona soluciones globales de liquidación financiera para permitir que el mundo intercambie valor como si ya intercambia información dando lugar a una Internet de Valor (IoV). Las soluciones de Ripple reducen el costo total de liquidación al permitir a los bancos realizar transacciones directas, instantáneas y con certeza de liquidación “, lee la copia de la compañía en su sitio web oficial.

Inicialmente un contendiente mediano, Ripple ha ganado impulso en el mercado de la criptocercencia, viendo un aumento marcado a principios de este año. De hecho, Ripple experimentó un aumento del 100 por ciento en valor dentro de un período de 24 horas a finales de marzo.

Litecoin

El ex ingeniero de Google Charles Lee creó este altcoin en un esfuerzo por mejorar Bitcoin. A saber, la velocidad para generar un nuevo bloque se mejora dramáticamente. Las transacciones son mucho más rápidas. De la misma manera, sin embargo, esta velocidad hace que Blockchain de Litecoin sea más grande y más propenso a producir bloques huérfanos.

Dash

Dash, una combinación de las palabras “digital” y “efectivo”, es el dinero en efectivo de Internet. Dash es rápido. Sus transacciones son instantáneas. “Tu tiempo es valioso. Los pagos de InstantSend se confirman en menos de un segundo “, afirma Dash. En comparación, las transacciones de Bitcoin pueden tardar hasta una hora en procesarse.

La minería de GPU / CPU ya no es rentable. Con el fin de mina, necesitará hardware específico, las computadoras conocidas como ASICs para completar Dash ‘s prueba de trabajo rompecabezas.

Ethereum Classic

Una plataforma paralela de Ethereum existe y sostiene un uso considerable con una tapa del mercado que se cierne justo debajo de $ 430 mln.

¿Por qué existen dos versiones de la misma plataforma?

La comunidad Ethereum se fracturó cuando un desacuerdo sobre cómo un robo técnicamente legal de los fondos debe ser manejado. La mayoría de los usuarios deseaban cambiar el código de Ethereum para recuperar los fondos perdidos. Una minoría cree que Ethereum no debe ser manipulado o alterado por terceros. Incluso en casos de usuarios que explotan la característica de contrato inteligente para engañar a otros, Blockchain debe permanecer “inmutable”. Así, la minoría creó la versión clásica de Ethereum, que todavía sobrevive y prospera.

Monero

Monero está orientado hacia aquellos que desean un mayor anonimato. La criptoconversión le permite “enviar y recibir fondos sin que sus transacciones sean públicamente visibles en Blockchain”. Las transacciones son completamente imposibles de rastrear debido al aprovechamiento de firmas de anillos de Monero. Desafortunadamente, debido al énfasis de Monero en la privacidad, ha sido adoptada por la darknet y otras organizaciones criminales.

 

Referencia: https://steemit.com/@blckrbbt

Open Bitcoin ATM

Open Bitcoin ATM

This Open Bitcoin ATM might be a simply way to distribute Bitcoin in establishments that want to use it for sales. Just make sure no one walks away with the big box of cash.

“Open Bitcoin ATM is the worlds first open-source automated teller machine for education and experimentation.

Want to make one? Here’s a step by step tutorial. It takes about 7 – 10 hours to build with simple tools. Cost of components are less than $500 new but used parts can be purchased for even less on eBay.”

See the project Here

Securing Your Wallet

You should note that there aren’t actually any bitcoins stored in your wallet.

A bitcoin is really nothing more than a balance recorded in a publically shared ledger. Transactions are orders to the Bitcoin network to transfer some of your balance from your bitcoin address to someone else’s. The way you prove to the network that you own the bitcoins associated with a particular address is by signing your transactions with the private key that matches that address. Here’s what they look like:

Bitcoin Address: 12CbHSwuMVxbwdGzCZaiLnXgxFBj3YE2ax

Private Key: L32qYhUt93qg7MWUSYCUaPKS9qeaKEZquV566Qfh7wZfqqmvZZum

Without the private key, you can’t spend your bitcoins. It is this private key (or keys if you use more than one address) that is stored in your wallet. Needless to say, if your keys are lost or stolen, your bitcoins are gone forever. Hence, why you need to take precautions to prevent that from happening.

Hot Wallet vs. Cold Storage

In Bitcoin parlance a “hot wallet” is a wallet that is connected to the internet, while “cold storage” refers to wallets that are kept offline. The distinction is important because wallets that are connected to the internet are susceptible to being hacked and having the keys stolen. We’re going to talk about some steps you can take to prevent your hot wallet from being hacked, but it’s not possible to completely eliminate this risk. Cold storage, on the other hand, if done correctly eliminates the possibility that your wallet can be hacked.

As a general rule, you should treat your hot wallet very much like the real wallet that you carry around with you. You wouldn’t go walking down the street with thousands of dollars of cash in your pocket. To do so would just be asking to get mugged. Instead you might carry one or two hundred dollars tops. Certainly nothing more than you can afford to lose if you did get mugged. Hot wallets are the same way. Given the potential for theft, you don’t want to keep any more than a couple hundred dollars worth of bitcoins in a hot wallet. If you own more than that, the rest should be kept in cold storage and only removed when you actually need to spend the bitcoins. It may sound like I’m just offering up a suggestion here, but if you don’t want your bitcoins stolen, this practice should not be considered optional.

Securing Your Hot Wallet

There are three different types of wallets — software wallets, web based wallets, and mobile wallets. We’ll skip discussion of mobile wallets since they are a bit more experimental and I wouldn’t expect you to keep that many bitcoins on your phone anyway. Software wallets install on your computer and store your keys on your hard drive. For example, the windows version of the reference client, Bitcoin-Qt, stores the keys in a wallet.dat file located in the C:\Users\YourUserName\AppData\Roaming\Bitcoin directory. Any hacker attempting to steal your keys will be looking for this file. We should note that, by default, this file in unencrypted. All it takes is for a hacker to copy this file and they have your keys. Wallets will typically let you encrypt this file to protect it. In Bitcoin-Qt you can encrypt it from the settings menu.

Bitcoin-Qt When encrypting your wallet make sure you use a strong password. As you hopefully know, a brute force attack becomes exponentially more difficult as the length of your password increases. Random passwords of 12 or more characters should take hundreds of thousands of years to brute force. Some people make the mistake of picking a long word then changing some of the letters to symbols in an attempt to create a password they can remember. For example: @r3V0LuTi0n#. The problem with these type of passwords is that there are algorithms out there that will pick a word from the dictionary and check 10,000 combinations of that word per second. So while you think you’ve got a strong password, it can be broken pretty easily. There’s no substitute for plain old random characters: 8t$e2%?U(qHr3t!

Unfortunately, even encrypting your wallet file isn’t going to completely protect you. If your computer gets infected with malware that logs your keystrokes, an attacker could get the password to your wallet and steal your bitcoins. If someone is capable of hacking into your computer and stealing the wallet.dat file, he’s also likely to be able to get your password. Installing anti-virus software and keeping it up to date can help, but it isn’t foolproof.

AuthenticatorAnother option you have is to use a web based wallet such as Blockchain.info. These wallets works similarly to a software wallet except the keys are stored on a web server rather than on your hard drive. Like a software wallet, the keys are encrypted and can only be decrypted with your password.

An additional security feature that web based wallets will frequently offer is two-factor authentication. The two most popular two-factor services are Yubikey and Google Authenticator. Yubikey requires a USB drive to use while Google Authenticator requires that you download an app on your phone. Setting up a wallet with two-factor authentication is extremely easy. It may take a minute at most. Once enabled, you will be required to sign in with both your password and the two-factor validation code. You can see what Google Authenticator looks like on the right. It refreshes the validation code every 30 seconds making it impossible to brute force. If you have two factor enabled, an attacker will not only need your password, but also your cell phone or yubikey USB drive to steal your bitcoins.

While web based wallets will offer two-factor authentication as an optional service, it is NOT optional if you don’t want to get your bitcoins stolen. The history of bitcoin is replete with people who thought they didn’t need two-factor only to lose hundreds of bitcoins. Don’t be one of them — use two-factor authentication.

Blockchain.info also allows you to enter a second password that will be used for making transactions (separate from the password used to log in). This password is entered using your mouse and an on-screen keyboard to avoid keyloggers. Again, never pass up an opportunity to increase the security of your wallet. It will be worth it even it is less convenient.

Also, there is a particular type of attack that someone could attempt which involves altering the javascript that your browser downloads when it connects to the site. When you sign in, your password would be sent to the attacker allowing him to access your wallet. To prevent this, Blockchain offers Chrome and Firefox browser extensions that can be downloaded from the Chrome Web Store or Firefox add on manager and launched from the apps menu. The extension downloads the javascript onto your computer rather than loading it from the internet preventing this type of attack.

Browser Extension You can tell you’re using the extension because the Blockchain logo at the top of the page will have the Chrome logo next to it. If you don’t see the Chrome logo, don’t sign in! You really should never be logging in to your web wallet through the internet, only through the browser extension. Doing otherwise is unnecessarily putting your bitcoins at risk. Blockchain Chrome Logo On a final note, always backup your hot wallet. If your hard drive crashes or the server where your keys are stored goes down, you’ll lose your bitcoins. Most software wallets will have an option in the menu to backup your keys or you could simply copy the wallet.dat file to a flash drive, the cloud, or another computer. Web based wallets will give you an option to download a backup or have one emailed to you.

Cold Storage

Now we’re going to talk about how to securely create a cold storage wallet. Keep in mind it isn’t as simple as generating a new Bitcoin address, copying the private key to a flash drive, then deleting the key off your computer. If you do this while connected to the internet, someone could steal your keys in the window between when you generated the keys and when you deleted them from your computer. There are better options for doing this securely.

Option 1: This is the preferred method for creating a cold storage wallet. You will need a second computer that you are committed to keeping offline permanently. An old computer or laptop that you don’t use anymore will work provided that it isn’t liable to crash on you.

  1. Install the Bitcoin software on this computer.
  2. Unplug it from the internet or disable your WiFi connection. Be sure that you NEVER reconnect it after this point.
  3. Generate a new Bitcoin address and private key. With Bitcoin-Qt you can just delete the wallet.dat file and it will create a new one when you restart the software.
  4. Copy these keys to flash drives in case your computer crashes. Keep the flash drives in separate locations. You might want to hide one in your floorboards or put one in a safe deposit box.
  5. Send bitcoins from your hot wallet to the address you just generated.

By creating a cold storage address this way, you can guarantee that your private keys will never touch the internet, thus making it impossible for your keys to be stolen. That is, unless someone physically accesses your computer or flash drives. But that is why you encrypt them after all.

How you can generate a new key pair while offline. How do you know that the bitcoin address you generate isn’t already taken? The answer is there are so many possible bitcoin addresses that the probability you will generate an address that is in use by someone else (or vise versa) is remote. Put it another way, if you were generating bitcoin addresses non-stop every day, the Sun would turn into a red giant and engulf the Earth before you would stumbled across an address already in use.

Option 2: If you don’t have a second computer, there is another way of creating a cold storage wallet, but keep in mind this option doesn’t 100% guarantee that your keys won’t be stolen the way option 1 does.

  1. Disconnect from the internet and turn off your modem.
  2. Open the Bitcoin software and generate a new bitcoin address.
  3. Copy your wallet.dat file to a flash drive (or multiple flash drives)
  4. Delete the wallet file from your computer.
  5. Restart to clear your memory of any data that may be stored by malware.
  6. Reconnect to the internet and send bitcoins from your hot wallet to the new cold storage address.

While I’m not an expert on malware, I’m going to assume that it is possible for malware to copy your private keys (after you generate them offline) to your hard disk and upload them once you reconnect to the internet. I haven’t heard of this happening, but I suppose the possibility is still there.

It is possible to mitigate this risk if you want to go through the trouble of booting into another OS. If you are unaware, you can boot into temporary operating system directly from a DVD or USB drive without actually installing the OS on your computer. Doing so will isolate your work environment from any malware that you might already have on your computer. In my opinion, the best OS to use for this purpose is the Linux based Tails operating system. Tails is specially configured to not use your computer’s hard disk, only the memory. That means if you accidentally download malware while using tails, it will be erased when you reboot into your normal OS. This should prevent malware from copying your keys and broadcasting them when you finally reconnect to the internet. It may sound like booting into another OS is difficult, but it really isn’t. The Tails website has easy to follow instructions. It really amounts to little more than downloading an .iso file, burning it to a DVD, then rebooting with this DVD in your drive. It’s that simple.

I should probably also mention that Coinbase runs free hosted wallet service. They keep approximately 90% of the bitcoins their customers store with them in cold storage (safe deposit boxes to be exact) and about 10% in a hot wallet so they can spend them at their convenience. If you’re not comfortable making a cold storage wallet yourself, you might want to consider outsourcing it to them. Considering their livelihood is on the line if they fail to keep your bitcoins safe, I would say they are pretty secure. The only problem would be if the U.S. government decided to raid Coinbase, you would lose all your bitcoins. That wouldn’t happen if you store them yourself.

Paper Wallets

Instead of (or in addition to) keeping your cold storage private keys on a hard drive or flash drive, you can print them onto a piece of paper. Paper Wallet You could do this by using either options 1 or 2 from above. There are several websites that offer paper wallet generators. Blockchain.info, Bitcoinpaperwallet.com, and Bitaddress.org among others.

If you are going to use these services DO NOT just generate the paper wallet in your browser. You could be victimized by the same javascript attack I mentioned earlier. You can avoid this by using the Chrome or Firefox browser extentions if you are using Blockchain.info or by downloading the source code for the other sites from GitHub and running the script natively. If you’re paranoid that your roommate or a bank employee (if using a safe deposit box) might steal your paper wallet, you might want to consider printing it out with a BIP 38 encrypted private key.

Brainwallets

The only reason you actually need to store a private key somewhere is because it’s so difficult to memorize it. If you could memorize it, then you wouldn’t need to worry about your computer being hacked. Enter brain wallets. A brian wallet is a bitcoin wallet that is generated deterministically from an easily memorizable passphrase. For example:

Passphrase: Man made it to the moon,, and decided it stinked like yellow cheeeese.

Private Key: 5JhmqDih2bTprJLZJYwUgnsAiHNbU8DReuBFMKCq5nPAmj1PeYQ

Bitcoin Address: 1CeU9ugjwfsnzrhqjKy1HUBzXCCXVC76m1

So long as you can remember the passphrase, you can always generate the corresponding private key and bitcoin address at a time of your choosing. This would especially useful for people trying to smuggle bitcoins across international borders. You wouldn’t need to try to create a hidden partition on your hard drive or hide a flash drive on you somewhere. You could simply store your bitcoins in your head and clear customs with no problem.

Keep in mind, if you are generating a brain wallet, your passphrase needs to be much longer and much more random than a typical password.  Possibly a random sentence containing over ten words and a few unique spellings and avoid using sentences or quotes found in published literature. Also, considering adding a salt to the end of your passphrase to increase the security:

Man made it to the moon,, and decided it stinked like yellow cheeeesea4uMj92Hnlx.

Like paper wallets, there are websites you can use to generate a brainwallet: Blockchain.info, Brainwallet.org, Bitaddress.org. Just like before, you want to use options 1 or 2 for creating the brainwallet offline and either use the browser extension or download the source code from github when running the script.

Removing Bitcoins From Cold Storage

If you are trying to remove bitcoins from cold storage, you must spend the entire amount. There have been plenty of people have tried spending only part of their cold storage balance only to lose everything. To understand why this is the case, you have to understand how bitcoin transactions work. When you go to spend bitcoins, you have to prove you own the amount that you are trying to spend. Your wallet does this by pointing to a transaction in the blockchain where you received this amount bitcoins or more. This amount is considered to be the transaction “input”. As per the protocol, transaction inputs and outputs must be equal. So lets say you want to spend three bitcoins. Your wallet might use a prior transaction where you received 10 bitcoins as the input. Since outputs must equal inputs, your wallet will send three bitcoins to the destination and seven bitcoins back to yourself as “change”. Many wallets, including Bitcoin-Qt, will generate a brand new bitcoin address for the change rather than send the change back to the original address. This is considered to be an anonymity feature.

If you import your private key into your hot wallet from cold storage and make a transaction for less than the full balance, your wallet will send the change to a newly generated change address. If you assume the balance is still in your original cold storage address and proceed to delete the new wallet file, you will be deleting the keys to the change address leaving your original cold storage address with a balance of zero.

So to eliminate this possibility, always spend the entire balance from your cold storage address. If you want to keep some funds in cold storage, go through the steps for creating a new cold storage address and send the balance there. It may be more convenient to create multiple cold storage addresses, each with a balance of 5 BTC, say, rather than a single address with a balance of 100 BTC. That way you would only have to remove 5 BTC from cold storage when you want to spend it, rather than the full balance.

Offline Transactions

Instead of going through the hassle of completely removing funds from cold storage every time you want to make a transaction, there is an advanced feature that allows you to make transactions directly from cold storage. If you use a second computer for cold storage like described in option 1 above, this is how you would do it:

  1. Create an unsigned transaction sending bitcoins from your cold storage address to the destination.
  2. Transfer the unsigned transaction to the cold storage computer via a flash drive.
  3. Have the cold storage client sign the transaction using your private key.
  4. Transfer the signed transaction back to the online computer and broadcast it.

Doing it this way, you can make a transaction without exposing your private keys to the internet, eliminating the possibility of theft. Currently, the bitcoin wallet Armory is the only wallet with this feature.

Hardware Wallets Trezor

Finally, we’ll wrap up with a new technology that should be hitting the market very soon — hardware wallets. As you can gather from our discussion thus far, the most secure way to use bitcoin is to use a second computer for cold storage and offline transactions. The problem is that most people don’t have a second computer available and even if they do, it takes some technical skill to set it up properly.

A hardware wallet essentially serves as your second computer. Your bitcoin address and private key are generated entirely on the device and never come in contact with the internet.  When you want to make a transaction, the hardware wallet signs the transaction and sends it over a USB cable to your computer for broadcast. The image on the right is of the Trezor hardware wallet which is scheduled to start shipping in either October or November. Butterflylabs is apparently also working on a hardware wallet, but I’ll believe that when I see it. They are notorious for over-promising and under-delivering.

iPhone 6 parts surface on Twitter

iPhone 6 parts surface on Twitter, hint at a larger screen on the way (update: likely fake)

Lately it seems like Apple can’t build anything without a few prototype cases leaking into public view, and now we’re seeing pictures of what could be the next iPhone. Posted by a Twitter user earlier today and addressed to several Apple-focused websites, the “iPhone 6” shells look very close to current models, but are thinner and have space for a larger edge to edge-style display, which has been rumored before. Sonny Dickson, who has previously obtained iPhone and iPad parts prior to the launch of new devices, has also apparently received the same pictures and tells MacRumors they came from a source in China. Based on the ports, MacRumors says the parts here are 2.6-inches wide, compared to the iPhone 5s which is 2.31 inches. Are these pics the real thing, and if they are, do they represent what we’ll likely see from Apple later this year? Without any details to back them up we can’t be sure, but you can check out a few more pictures for yourself after the break.

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Best Bitcoin mining software

Best Bitcoin mining clients

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Are you thinking of joining the Bitcoin mining universe? In case you don’t know, you can either mine on your own or as part of a pool. In terms of profit, there aren’t really many differences: solo mining will give you large and irregular payouts, as pooled mining will result in small and frequent payouts. In the end, they both add up to the same amount.

Whatever your choice might be, remember you need to follow certain steps to successfully mine Bitcoins: get the right hardware, get the best software that matches your needs, arrange a way to receive the profits of mining and start solving algorithms.

This is where you stop and think: but what is the best software for me if I don’t even know them all? Well, let’s make a small list of the most used software and help you choose.

1. CGminer

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This software is, currently, the most popular GPU/FPGA/ASIC miner. CGminer is an open source GPU miner written in C available for several platforms like Windows, Linux and OS X. One of the things that make it extremely popular is the fact that it’s based on the original code Cpu Miner, which you can discover in Bitcoin Wiki.

This software includes overclocking, monitoring, fans peed control and remote interface capabilities. His other features include self detection of new blocks with a mini-database, binary loading of kernels, multi GPU support and CPU mining support. There are a lot of other characteristics you can discover here, at CGminer official forum.

Download CGminer here.

2. BFGminer

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This software is a derivative of the previous CGminer, designed specifically for FPGA and ASICs, but without the central focus on GPUs like CGminer. The latest update on BFGminer, the 3.1.1 version launched in April 2012, features dynamic clocking, monitoring and remote interface capabilities.

Besides being a super versatile program, BFGminer has really interesting features: vector support, integrated overclocking and fan control, ADL device reordering by PCI bus ID, support for mining with free Mesa/LLVM OpenCL and for getblocktemplate decentralized mining protocol and also crypt mining support for both CPU and OpenCL (GPU).

A little reminder: if you’re mining with a ModMiner, X6500 or ZTEX devices, you need to download bitstreams to make sure BFGMiner 3+ works with your device. You can find them in the official BFGminer forum and check BFGminer’s official website here.

Download BFGminer here.

3. BitMinter

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We can say that, although BitMinter might not be the most popular mining software, it’s certainly one of the best when it comes to connect with users and potential “clients”. The software’s official website is quite complete and straightforward: for the creators of the program, it’s all about making Bitcoin mining “easy” and winning “high payouts”.

BitMinter is different because it’s a software that belongs to a mining pool, so your initial step is to register and fill in the pool sign-up form. So, it’s a great option if you’re looking for a simple installation.

Besides being available for operative systems like Windows, Linux and Mac OS X, BitMinter assures a good mining speed and long polling in order to reduce stale work. It also allows you to mine on OpenCL-compatible GPUs or ASICs/FPGAs (BFL, Block Erupter and other Icarus-compatible). The official BitMinter forum can be found here.

4. BTCMiner

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This open source Bitcoin mining software for ZTEX USB-FPGA Modules 1.15 runs on the operative systems Linux and Windows. Yet, Windows users need to install the libusb driver first, which you can find here. The FPGA boards supported by BTCMiner (USB-FPGA Modules 1.15b and 1.15d, USB-FPGA Modules 1.15x and USB-FPGA Modules 1.15y.) have a USB interface, which can be used for communication and programming, allowing the user to build low cost FPGA clusters with standard components (like USB hubs, for instance). In practical terms, this means no JTAG programmer is required and the program allows to run large mining rigs from just one software instance.

The software features a ready-to-use Bitstream, which doesn’t require any Xilinx Software or a license, so this is an advantage. However, its dynamic frequency scaling is based on error measurement: so, BTCMiner automatically chooses the frequency with the highest rate of valid hashes. You can find BTCMiner official website here and discover more about this mining software.

Download BTCminer here.

5. Poclbm

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Poclbm is a python GPU Bitcoin mining software, which uses the OpenCL framework to perform the hashing computations in a quick way. This framework, which allows programmers to write code that will work across a big variety of hardware, reveals all its potential when used with a modern GPU, producing hash rates of higher magnitude than what can be achieved with a normal CPU.

The program works perfectly with AMD – 4xxx and up, as well as with Nvidia – 8xxx and up (also video cards). According to some users talking in the official Poclbm forum, the software is great for experimentation and also multiple machine mining (not so good for the masses).

Download Poclbm here.

6. DiabloMiner

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This program is a Java GPU Bitcoin miner that uses the OpenCL framework, like Poclbm. This way, DiabloMiner also allows its users to quickly perform the hashing computations. The software, which is a command line kind of program, works on current Nvidia drivers and ATI Stream SDK 2.1. This characteristic means that the users need to open a terminal (cmd.exe, Terminal.app/iTerm2 or xterm, among others) and run the program from there.

If you’re mining in multiple pools, it’s important to know that DiabloMiner supports unlimited pools and is able to switch to the next pool on connection failure, returning to the first one every 60 minutes, according to information available on the software’s website. To read some opinions of users go to the DiabloMiner official forum.

Download DiabloMiner here.

 

After presenting you these different software miners and its characteristics, it’s safe to say one thing: more important than rating them and placing them on a podium, you need to know them to correctly choose the one that’s better for your needs and already available hardware. If you’re looking for a technical comparison, check these tables at Bitcoin Wiki. Good mining!