feat: optimize the signing process of unverified contracts.

[overcat]

Checklist

• App update process has been followed
• Target branch is develop
• Application version has been bumped

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@           Coverage Diff           @@
##             pub2      #52   +/-   ##
=======================================
  Coverage        ?   89.36%           
=======================================
  Files           ?        5           
  Lines           ?     2688           
  Branches        ?        0           
=======================================
  Hits            ?     2402           
  Misses          ?      286           
  Partials        ?        0           

Flag	Coverage Δ
unittests	89.36% <ø> (?)

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