There are lots of other channels that vendors could use. http://3suaolltfj2xjksb.onion/hiddenwiki/index.php/Main_Page#Web_Hosting Freedom Hosting http://xqz3u5drneuzhaeo.onion -- Requires invite, but they are floating around TorHost http://torhostg5s7pa2sn.onion -- Free if you just want to put up a text file with your key OnionHosting http://bj6sy3n7tbt3ot2f.onion -- Costs 5 BTC but is your security worth that much? You can also create a Wordpress.com account over Tor and post your key there, and at some other clearnet blogging service. Post your key to 2 or 3 of those places before you put it in your profile. Create an account on the forum and introduce yourself, referencing the other places where your key can be found.