Try installing Tor first then using bitcoincore.org's hidden service to fetch binaries

For improved privacy we ought to try an amend the script to download bitcoin binaries and signatures from bitcoincore.org's new hidden service: http://6hasakffvppilxgehrswmffqurlcjjjhd76jgvaqmsg6ul25s7t3rzyd.onion/

See [blog post](https://bitcoincore.org/en/2020/03/27/hidden-service/)

Read the shell installation scripts and trace how Bitcoin binaries and signatures are currently downloaded. Check the linked bitcoincore.org hidden-service post, then determine where Tor availability and the .onion endpoint fit. Done means the script tries Tor first and fetches the binaries and signatures through the hidden service.

Written by the indexing model from the issue text.