I had been thinking about the consequences of Ethereum switching to POS it and I woul like to share my thoughts and get your opinions on this.

We all know that the main innovation introduced by Ethereum is the capacity of creating different distributed applications in front of the Bitcoin network which is completely devoted to a single 'application': the transmission of value.

When switching to POS the Ethereum network will become completely self-sustained and disconnected from the physical world since miners and their hadrware won't be needed anymore. However, this means that you can create an Ethereum-like network with exact the same properties and security just by hardforking the original one. Since all the networks would be equivalent the difference would be given by the use which, in turn, would depend on the functionality deployed into them. Since the Ethereum network at present is mostly used as an investment vehicle rather than a gas-fueled dapp platform. Do you think that the original network could be overtaken as what happened with pure-POS coins Nem and Nxt (in fact Nem was just inspired in Nxt, but you know what i mean...)?

The idea is that you can request pictures from any place/event around the world or you can offer yourself to take pictures from your area. Internet pictures (if not copyrighted) have generally poor quality and do not usually fulfill what you want/need from a picture.

We have updated the application so that users can now offer their services as photographers. In the 'photographer' section of the user page, users can add different locations where they can take photos by clicking the location on the map and specifying the distance they can cover around this location. Other relevant information can be specified such as: photographer experience, available hardware, rates, coins accepted....

Hemos actualizado la aplicación para que los usuarios puedan ofrecerse como fotógrafos. En el apartado 'photographer' de la página de usuario se pueden añadir localizaciones donde el usuario se ofrece a realizar fotos: tan sólo se ha de marcar la localización en el mapa e indicar la distancia alrededor de dicha localización que puede cubrir el usuario. También se puede indicar cualquier otra informacion relevante como experiencia en fotografía, camaras de que dispone, tarifas, criptos aceptadas...

Nos gusta tu idea. En una próxima actualización incluiremos que los usuarios puedan ofrecerse como fotógrafos sobre el mapa indicando en qué zonas pueden hacer fotos y sus precios.

gracias!

gracias!! 

Nuestro esquema de encriptación de datos tenía una debilidad ante un ataque man-in-the-middle. Ya está corregido.

Our data encryption scheme was weak against a man-in-the-middle attack. We have solved this issue.

Thanks for your response. I didn't know that the private key was formatted like a Bitcoin address (version byte plus checksum bytes at the end). Is it possible to import a raw private key (i.e. a 256 bit random number) or is mandatory to format the key in that way?

Hi,

I've visited bitaddress.org to generate a paper wallet, but all the private adddresses generated start with '5H', '5J' or '5K'. Anyone knows if this is a bug of the RNG, javascript, browser... or whatever?

To make myself clear I've done the calculation of the acumulative probability of a collision as the addresses are generated. This probability increases with the square of the number of generated addrsses. If we consider the most restrictive case: the 160 bit space of the public key hash, a 1% probabiliy of bitcoin addresses collision will be reached when 1.2x10^23 bitcoin addresses are generated. This means that a million machines generating 30 million addresses/second each would need a thousand years to reach a 1% probability of a single collision.

2^256 is approx. 10^77, the age of our universe is 4x10^17 s approx. Even if you had a trillion machines (10^12) generating 100 million addresses per second since the big bang you would cover the 0.00000000000000000000000000000000000000001% of the 256 bit configuration space. It is more likely that a frappuccino pass through Mark Karperles by tunnel effect.

Edit: if we only consider the 160-bit space corresponding to the public key hash. The same trillion machines working since the Big Bang would only cover the 0.000000000001%, so it can be safely said that generating used keys is improbable.

Si es una moneda cuyo objetivo pricial es repartirla entre todos los españoles, por qué no hacer un clon de NXT en el que toda la masa monetaria está preminada y, simplemente, se reparte. Encuentro que en el concepto de esta moneda no encaja la minería.

Gracias por vuestros comentarios! En el post inicial iré poniendo todas las actualizaciones y mejoras que vayamos implementando.

saludos

gracias!

Thanks. Sorry for my ignorance, but what's this 'graphic' project from google? Did google put a smart camera on every corner of the planet and I didn't heard about it? 

Thanks for your comment. It wasn't our preferred name, but we chose it because it includes the keywords 'photo' and 'bitcoin' in the domain name and we didn't want something like: thisismyveryexplicativedomainname.com  

Thanks for your report. We registered both bitcoins4photos.com and photos4bitcoins.com and the confirmation e-mails are sent using the first domain, my fault . Just paste the confirmation URL in your browser and change bitcoins4photos.com for photos4bitcoins.com.

sorry for the inconvenience.

Hola a todo el mundo,

Me gustaría presentar nuestra pequeña contribución a la (micro)criptoeconomia: photos4bitcoins.com. Se trata de un sitio web en el que puedes obtener fotos de cualquier parte del mundo por criptomonedas. Si necesitas una foto para una web, una foto de un evento... o por cualquier otra razón, sólo tienes que ofrecer unas monedas y, tal vez, un bitcoiner (o altcoiner) hará la foto por ti. Por supuesto, también puedes obtener criptos enviando fotos para las peticiones de otros usuarios.

Si una de tus fotos enviadas es elegida por otro usuario se te requerirá que envíes una dirección para cobrar la recompensa. En ningún caso el sitio web se hace cargo de las monedas de los usuarios. Las transacciones con criptos se realizan directamente entre usuarios y el papel del sitio web se limita a la custodia de las fotografías digitales.

El sitio es bastante sencillo y utiliza una interfaz geográfica para simplificar la localizacion de las peticiones. Por ahora sólo está implementada la funcionalidad básica, pero iremos añadiendo funcionalidad basándonos principalmente en el 'feedback' de los usuarios.

Se agradecen sugerencias y opiniones. Esperamos que os guste!

PS: notareis que el sitio no utiliza certificado digital (odiamos pagar por un simple par de claves). Como el sitio no requiere un alto nivel de privacidad no lo consideramos imprescindible. Sin embargo, los datos más sensibles (email, password y direcciones de pago) se envian al servidor utizando encriptacion RSA de 1024 bits.

actualización 09-03-2014:
  - implementación de la encriptación servidor-cliente para la descarga de direcciones de pago.
  - visualización de direcciones de pago mediante códigos QR.

actualizacion 24-03-2014:
  - añadida opción para comentar las peticiones y botón para informar de contenido inapropiado.

Hello everyone ,

I would like to introduce our little contribution to the cryptoeconomy: photos4bitcoins.com. This is a website where you can get photos from anywhere in the world for cryptocurrencies. If you need a picture for a website, a photo of an event... or for any other reason, you just have to offer some coins and maybe a bitcoiner (or 'altcoiner') will take the photo for you. Of course, you can also get some cryptos by submitting photos to requests from other users.

If one of your submitted photos is chosen by another user you will be required to send a coin address to receive the reward. photos4bitcoins.com never takes charge of the users coins. Transactions are made directly between users and the role of the website is limited to the custody of digital photographs.

The site is quite simple and uses a geographic interface to simplify the location of the requests. For now, only basic functionality has been implemented, but we will be adding more functionality based mainly on user's feedback.

Suggestions and feedback will be greatly appreciated. We hope you find it useful!

PS : You'll notice that the site does not use digital certificate (we hate to pay for a simple pair of keys). As the site does not require a high level of privacy, we do not consider it as essential. However, the most sensitive data (email, password and coin addresses) are sent encrypted to the server using javascript-based 1024 bit RSA encryption.

update 09-March-2014:
  - implementation of server-client encryption for payment address download.
  - QR-code visualization of payment addresses.

update 24-march-20214:
  - added comment box and report button