Don't fetch trusted inputs and pubkeys twice.

[nodech]

Related issue: #18

[codecov-io]

Codecov Report

Merging #25 into master will decrease coverage by 0.11%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master      #25      +/-   ##
==========================================
- Coverage   81.75%   81.64%   -0.12%     
==========================================
  Files          11       11              
  Lines        1069     1073       +4     
  Branches      128      130       +2     
==========================================
+ Hits          874      876       +2     
- Misses        195      197       +2

Impacted Files	Coverage Δ
lib/txstate.js	94.77% <50%> (-1.38%)	⬇️

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