.range(0..)?
.next_back()
.and_then(|result| result.ok())
.map(|(_height, hash)| BlockHash::load(*hash.value())),
),
}
}
}
.range(0..)?
.next_back()
.and_then(|result| result.ok())
.map(|(_height, hash)| BlockHash::load(*hash.value())),
),
}
}
}