Bitcoin Mixers and TOR Discussion

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Disclosure: I am not any kind of programmer nor expert, just a fan of BTC and enhanced privacy. In particular, I do not use TOR (don't know how, I could learn I suppose), and so have never used mixers with TOR addresses.

I have two items that may be worth discussing here in our community:

1)

In the time I have been here, I have only used two mixers, both "in the clear", SharedCoin (via blockchain.info) and Bitmixer.io (see ad below). My experience has been almost 100% positive using both, many times.

But, I have NOT used Bitcoin Fog, nor any of the other mixers with TOR (".onion") addresses. I believe that both bitmixer.io and SharedCoin have TOR options, but again, I have not used them.

I would be very interested to hear from users with positive and negative experiences (and costs/fees) from users of mixers via TOR.

2)

I have seen various rumors, which of course I have no ability to comment on, that TOR "is compromised".

-- Is this true?

-- In what way?

-- Can the threats to privacy using TOR be avoided somehow?

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Thank you for your help to our community to better understand both mixing via TOR and comments on how secure TOR is (especially for novices).