public async Task <IReadOnlyList <ByteString> > GetRecordMutations(ByteString recordKey)
{
var mutations = await RecordMutations.Where(m => m.RecordKey == recordKey.ToByteArray()).ToListAsync();
return(mutations.Select(m =>
{
return new ByteString(m.MutationHash);
}).ToList().AsReadOnly());
}
