optionalBlocks

Parameter used to indicate the type of optional data in key block headers. Refer to ANSI X9.143-2022 for information on allowed data type for optional blocks.

Optional block character limit is 112 characters. For each optional block, 2 characters are reserved for optional block ID and 2 characters reserved for optional block length. More than one optional blocks can be included as long as the combined length does not increase 112 characters.