upload blob data to server

(a) - User's computer (no Box account)
(b) - Server (Box account)

I'm trying to enable uploads to be sent to my Enterprise account on UTBox.
This will work by having a user (a) access a website we're running ,programmed in javascript. On the website they will record audio. The audio (blob data) will then be automatically
uploaded to our box account (b) without input by the user.

Currently were having issue sending the blob data to our UTBox server. Do you have any example code that we could use to allow this? If so, what infomation do we have to program into the
javascript?