C7

CDOL1 Related Data Length is an M/Chip-proprietary single byte stating the length of data related to CDOL1 (8C, covered earlier) that the card uses during the first GENERATE AC - a bookkeeping field specific to how M/Chip's own implementation of the CDOL mechanism tracks the data it's working with, rather than a core EMV concept. Because CDOL1 itself is already a variable-length, self-describing tag-and-length list, a terminal doesn't strictly need C7 to correctly build or parse a CDOL1-driven request - C7's role is internal to how M/Chip's own card-side logic manages that data, which is why a generic EMV implementation typically doesn't need to interpret it beyond recognising its presence. Consistent with the rest of this small M/Chip-proprietary cluster, its source citation in the underlying acervo carries a verificar vigencia flag, preserved unchanged rather than promoted to confirmed. See Mastercard M/Chip 4 Card Application Specification.