Implement GPG Verification (Bitcoin-OTC)

I'm looking to implement a "Verify with Bitcoin-OTC" feature for my web app. The general idea is the user would prove he owns a particular account on the external site Bitcoin-OTC and my app would accept/deny him based on his rating there.

Here's how I'm thinking of implementing this:

1. User provides Bitcoin-OTC username.


2. My app looks up his GPG fingerprint using this bitcoin-otc gem.


3. My app presents the user with his encrypted one-time password and asks him to decrypt it.


4. User provides decrypted password.


5. My app verifies it with the gpg everify command on Freenode and accepts/denies the user.

The part I'm struggling with is step #5. I'm doing it this way because I'm not sure Bitcoin-OTC exposes an API. I'm not sure how to programmatically communicate with the bot on their IRC channel.

Steps 1-5 are basically how a user would verify himself on the Bitcoin-OTC IRC channel except my app is acting as a middleman.

My questions are:

• How can I achieve step #5?


• Does adding my app into this flow introduce any security risks?