OTP Registers is located in layer "OTP Registers" from 80h to 109h. 
"Program OTP Registers" function programs user-programmable OTP bits from 85h to 88h and from 8Ah to 109h.
"Program Lock Registers 0 & 1" function programs data from adresses 80h and 89h.
Read and Verify OTP Registers functions work with the whole "OTP Registers" area. 

For more information see device datasheets.