Use unique DNS key

[mojoX911]

Fixes #348

Made on top of #345

Only review from commit 4fb34ee

[codecov]

Codecov Report

Attention: Patch coverage is 44.44444% with 20 lines in your changes missing coverage. Please review.

Project coverage is 72.92%. Comparing base (81618fe) to head (0c42b56).
Report is 10 commits behind head on master.

Files with missing lines	Patch %	Lines
src/market/directory.rs	45.71%	19 Missing ⚠️
src/market/rpc/server.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #349      +/-   ##
==========================================
- Coverage   72.97%   72.92%   -0.05%     
==========================================
  Files          33       33              
  Lines        4107     4118      +11     
==========================================
+ Hits         2997     3003       +6     
- Misses       1110     1115       +5     

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