BuildUnits constructs one verification unit for each segment, together with its associated revocations.

StartVerification builds the units for the given segMetas and sRevInfos and spawns verify method on the units.

Verify starts the verification for the given segMeta and sRevInfos.

Unit contains multiple verification items.

RevVerificationFailed is the callback for a failed revocation verification.

RevVerified is the callback for a successful revocation verification.

SegVerificationFailed is the callback for a failed segment verification.

SegVerified is the callback for a successful segment verification.