NewEpoch returns a new invalid epoch, containing an error describing why the epoch could not be retrieved.

NewEpochf is NewEpoch with ergonomic error formatting.

NewSnapshot returns a new invalid snapshot, containing an error describing why the snapshot could not be retrieved.

NewSnapshotf is NewSnapshot with ergonomic error formatting.

Epoch represents an epoch that does not exist or could not be retrieved.

Epochs is an epoch query for an invalid snapshot.

Params represents parameters for an invalid state snapshot query.

Snapshot represents a snapshot that does not exist or could not be queried.