I'm looking for some kind of API service (like blockr.io) that will return the price of BTC (for any exchange, but preferably Bitstamp or something) at a point in the past.

So I could do something like:

http://some.api.com/get_price?date=[timestamp]

and it would return the price as it was on that timestamp. All the API's that I've been able to find will only return the current price.

Here is a screenshot of what I have so far:



Basically its just a crypto coin price watcher. You can enter a public key and the app will pull the amount (sourced from various block explorer's json api), and the price (sourced from various exchanges json api's) and calculate the total for each wallet entered. I built it with python and django 1.6. I'll put the code up on github probably this weekend. The nest tasks are to implement displaying different fiat currencies (for instance changing the display fiat from USD to EUR or GBP), and to implement this: https://github.com/LazarSoft/jsqrcode

btw I'm calling it "CoinStove" until I can come up with a better name

DAMNIT its a good thing I only registered coinsentry.pw which is only like 3 bucks a year

bumping this because i want this too

I was hoping wikipedia had a chart, but couldn't find one

The benefit is that you can access your bitcoin wallet from anywhere.

Blockchain.info is designed so that the private keys are stored in the client's browser and never make it to the server. Some people think this is more secure because blockchain.info never sees the private key, but now the private keys live in your browser's localStorage. Its just as likely to get hacked there is it is to get hacked on blockchain.info

I have an idea for a bitcoin wallet system that works like this:

1. You go to a website. Enter you credit card / pay with bitcoin.
2. Once the card has been charged / the transaction confirms, a new VPS instance is created for you.
3. On that VPS instance, bitcoind, nginx, and the CoinSentry software is installed. (basically a django based web wallet)
4. A domain name is set to that VPS instance (something like bob.coinsentry.com)
5. A SSL cert is installed
6. An email is sent to the user when the server has been built giving them their hostname and login details. Also they get the SSH keys so they can ssh into their newly created VPS instance.

Not the user has a hosted wallet running in their own server. Think something like blockchain.info wallet, but running in their own private server. You get the advantage of a hosted wallet, without giving up your private keys.

The user can change the SSH keys which locks out EVERYBODY to that machine.

The downside to this architecture is that you'd have to pay $5 a month to keep the VPS going. But you'd be the only person using that server, so it would be super fast.

Another problem is making sure no one else can get into the VPS server except for the user. Some VPS providers (such as AWS and Digital Ocean) provide an "out of band" console to the instance, which we would need to disable.

What do you all think? Is this something that sounds interesting? Basically the idea is split into two parts: The VPS creator (which is like a single purpose heroku), and the wallet software itself (which I'm calling CoinSentry). I had the idea for a project using a similar architecture (for performance reasons), but realized that this architecture may also work for a bitcoin wallet as well.