Function apply_sealed 

pub fn apply_sealed<F>(
    base: &Bundle,
    deltas: &[Bundle],
    seal_fn: F,
) -> Result<ApplyResult>
where
    F: FnOnce(&[u8]) -> Result<Vec<u8>>,

Materialize a delta chain and authenticate its final manifest using seal_fn. The caller must authenticate every input and authorize the output signer.