Risks and considerations for bitcoin transactions

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1. This was already answered 3 days ago:

In the last few days I get nodes from Russia

The relays of the Tor network are not operated by the Tor Project itself but rather by a global community of volunteers, including some volunteers running nodes in Russia (you can check the metrics on Tor Metrics). Although operating Tor nodes or other censorship circumvention technology is not legally forbidden in Russia, there are multiple attempts from the Russian authorities (such as Roskomnadzor) to block the Tor Project main website and the Tor network. But, regarding your question about…

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2. In 2020, there was an exit node operator/attacker that got caught messing up with cryptocurrency exchanges. We covered this bad relay case in detail on the Tor blog.
   As a recommendation: if you are concerned about the security of your cryptocurrency transactions, please consider following these measures
   a) Mitigate the risk by using onion services, which provide end-to-end encryption.
   b) Be caution and don’t use sketchy cryptocurrency exchanges, and avoid using platforms that don’t even set a proper HTTPS connections.
   c) Starting from Tor Browser 11.5 release (July 2022), HTTPS-only mode is enabled by default. It’s crucial not to overlook the “Secure Site Not Available” alert.