}
	return p, nil
}

// treeProofIndex builds the list of indexes needed to construct
// the sub-proof related to the subtree containing records [lo, hi).
// See https://tools.ietf.org/html/rfc6962#section-2.1.2.
func treeProofIndex(lo, hi, n int64, need []int64) []int64 {
	// See treeProof below for commentary.
	if !(lo < n && n <= hi) {
		panic("tlog: bad math in treeProofIndex")
	}

	if n == hi {
		if lo == 0 {