Fix zkpi to eels

[ClementWalter]

• Handle None to in normalize
• Split verification in several calls
• Fix ancestors order

Solves: #890

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.80%. Comparing base (a048607) to head (ada024d).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #901   +/-   ##
=======================================
  Coverage   77.80%   77.80%           
=======================================
  Files          64       64           
  Lines       16683    16683           
=======================================
  Hits        12981    12981           
  Misses       3702     3702           

Flag	Coverage Δ
ci	77.80% <ø> (?)

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