Thank you for your question.
If we reverse it, it will look like -
The structure of the protocol is -
0x0A - CRC-8Bit (calculated each time)
0x00 - Constant value (It will always be 0 here)
0x03 - Producers code (The Producer’s code can not be calculated it is written to the ROM and depend by the manufacturer.)
00-5B-7E-5A - Unique iButton serial no. (Printed on the cards)
0x01 - Family code
Hope this help you.