Store proofType for blind/signed processes

[coveralls]

Pull Request Test Coverage Report for Build 1786023666

• 85 of 104 (81.73%) changed or added relevant lines in 6 files are covered.
• 10 unchanged lines in 5 files lost coverage.
• Overall coverage decreased (-0.04%) to 55.595%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
urlapi/entity.go	5	7	71.43%
urlapi/util.go	66	83	79.52%
<!--	Total:	85	104	81.73%	-->

Files with Coverage Reduction	New Missed Lines	%
database/pgsql/migrations.go	2	36.36%
database/pgsql/pgsql.go	2	55.56%
test/testcommon/apis.go	2	74.19%
urlapi/public.go	2	56.36%
urlapi/util.go	2	81.79%
<!--	Total:	10		-->

Totals
Change from base Build 1785131005:	-0.04%
Covered Lines:	1883
Relevant Lines:	3387

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💛 - Coveralls