Here's the URL that scammed me:  http://bitblenduun5mnwp.onion/
Strange; here's something I found on Reddit, which says that the abovementioned URL at the beginning of the thread is owned by the same URL that ripped me off! I used to use Bitcoin Blender a few years ago, many times without incident, but I don't recall the URL. Anyway:

WARNING- Scammed by bitcoin blenders.

Dear reddit and darknet users,

Beware of utilising crypto currency mixing services such as bitcoin blender (refer to all links below links) Below are the blockchain links to my wallet and the deposit address along with an attached image confirming there is no BTC within the account.

Now I realise this was a small amount of BTC/mBTC but regardless consider the following a WARNING.

The following tor links are all owned by the same entity and do not use them under any circumstances..

bitblenduun5mnwp.onion

bitblendervrfkzr.onion

bitblender.org