Bitcoin be anonymously purchased through
tor in a secure and private fashion?
My question is related to:
but more focused on anonymous and private purchasing transactions.
First of all, anonimity and privacy are two different things. Bitcoin is designed to be pseudonimous - which is close to anonimity, but instead of being completely anonimous, you're linked to your bitcoin address, or pseudonym. You cannot make a private transaction on the Bitcoin network, but you can try to be as anonymous as possible.
It is possible to run Bitcoin Core as a Tor hidden service, and connect to such services. The first step is running Bitcoin Core behind a Tor proxy. This will already anonymize all outgoing connections, but more is possible.
More instructions at github: https://github.com/bitcoin/bitcoin/blob/master/doc/tor.md