OP_NUMEQUALVERIFY is similar to OP_NUMEQUAL but with an additional verification step. It performs the same numerical equality check and then executes an OP_VERIFY, meaning that the script will only continue if the comparison is true. This opcode is used in scripts where an equality check is crucial to the script's subsequent operations.
OP_Code Walkthrough
Compares the top two items of the stack for equality, stops executing if false
Pop Top Item a
Pop Top Item b
Check if a is equal to b, if not, script fails