Hi, I am a fiction writer doing a story on the darknet/undernet and services paid for using bitcoins.
Could you please take a few moment to help me understand a few things.

I gather activity on the undernet is virtually untraceable, not impossible, but virtually so if using i2p and a VPN.
Is it the same for use of bitcoins when you buy goods or services through the undernet using bitcoins - are they
less traceable than a credit card, for example?
Thanks for any information you can offer.