I just had an idea that I think would be excellent for increasing bitcoin popularity among merchants.

Example:

I'm selling something that I charge £100 for, but I also take bitcoin as payment and the buyer chooses to pay using bitcoin. I use an exchange's API to query the buy orders and calculate how many bitcoins I would need to immediately sell in order to earn £100. This is the cost of the product in bitcoins. The buyers sends that amount of bitcoins directly to the exchange using the sellers deposit address and the coins are automatically sold immediately. Once the coins have been sold, the exchange notifies the merchant and the merchant completes the buyer's order.

This would require the bitcoin client to allow you to enter a reference number and send it as a comment.

What an exchange could do to help with this.

• Implement a new api call that takes a currency value as its parameter and returns a bitcoin value. The bitcoin value is the number of bitcoins that would need to be immediately sold to earn the specified currency value.
• Implement functionality that allows bitcoins to be automatically sold as soon as they are deposited. In the case of confirmations being required, the coins could be "virtualy" sold until the required number of confirmations has been met. The buy orders would be temporarily removed until then and if the deposit could not be confirmed, the buy orders would be reinstated.

Here's a Windows Namecoin GUI for managing your wallet and domain names. It also allows you to manage your bitcoin wallet as well. Switching between namecoin and bitcoin is as simple as clicking Tools -> Switch to, then choosing either Bitcoin or Namecoin. It's written in C# and requires the Microsoft .NET Framework 4. Let me know of any features you'd like to see implemented and of course, any bugs you come across.

If you are not interested in using it for bitcoin, just leave the bitcoind path empty.



NamecoinGUI-0.5.0.18
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NamecoinGUI-0.5.0.18-source
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0.5.0.18
Fixed bug with the send fields causing an exception while the form is refreshing.
Fixed namecoin address validation (bitcoin addresses were being treated as valid namecoin addresses).
Fixed "Couldn't communicate with server" error when trying to send all coins. It now asks to try again with 0.0005 tx fee applied.
Added context menu to transaction lists.
Added transaction details. Either double-click or use the context menu.
Added transaction alerts to context menu.
Added success message after sending coins.

0.4.3.17
Disallowed new accounts named "Default".
Suppressed "Couldn't communicate with deamon" message while starting the daemon.
Tries to initially connect to the daemon every 10 seconds now instead of every 30 seconds.
Adding "Refresh rate" to "Settings" form, default value set to 30 seconds.
Fixed icon on "Settings" and "New Account" forms.

0.4.2.16
Fixed Send functionality which I completely broke in 0.4.1.15
Added currency and number globalisation support.

0.4.1.15
Fixed bug with form closing while controls are being updated.
Disabled command controls while daemon is offline.
Removed Send/Move Amount numeric input validation.
Fixed Send/Move accounts not being updated immediately.
Changed the default account name from being empty to "Default" in the tab lists.
Fixed multiple "Couldn't communicate with deamon" messages when the deamon is taking longer than usual to start.
Fixed account and transactions being filled before the information panel.

0.4.0.14
Undid 0.3.1.13 changes which caused the the GUI to freeze to while downloading the block chain.
Fixed a bug stopping names from being registered.
Implemented name_list
Implemented name_scan
Tidied up the GUI a bit
Only one deamon runs at a time now.

0.3.1.13
Code cleanup - removed background worker and delegates. Caused form freezing.

0.3.0.12
Added Bitcoin wallet support.
Added domain name check, pre-order, registration and update functionality (converts to IDNA format when applicable).

0.2.0.7
Implemented minimize to tray.

0.1.0.6
Pretty much takes cares of the wallet management side of things.
Removed the All transactions tab
Tidied up the code a bit

0.0.0.5
Implemented account balances.
Implemented send from account.
Implemented moving coins between accounts.
Implemented backup wallet.

0.0.0.4
New accounts and transactions show up immediately