align BlockSeal type with protobuf schema

[illia-malachyn]

Closes: #766

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 86.07595% with 11 lines in your changes missing coverage. Please review.

Project coverage is 56.65%. Comparing base (f5edcfd) to head (3ae9ebc).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
access/grpc/convert/convert.go	83.33%	6 Missing and 3 partials ⚠️
test/entities.go	92.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #780      +/-   ##
==========================================
- Coverage   56.67%   56.65%   -0.03%     
==========================================
  Files          35       35              
  Lines        6050     7269    +1219     
==========================================
+ Hits         3429     4118     +689     
- Misses       2127     2657     +530     
  Partials      494      494              

Flag	Coverage Δ
unittests	56.65% <86.07%> (-0.03%)	⬇️

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