Has anyone created a Bitcoin payment module?

I'm aware that Bitpay provides a module for zencart, but it involves a whole unnecessary process that uses Bitpay as a payment processor, who charges 3%. The beauty of Bitcoin is payments are free and you don't have to use any company like Bitpay as a payment processor. So I want to avoid that.

During checkout the module would pull and remove one address from a database you pre-fill, tell the customer to send to that address, set the order to Pending, poll the Bitcoin network in a cron job or something to confirm that the amount was paid, and when confirmed it sets the order status to Processing.