the lock script in a tx output field:
"asm": "OP_DUP OP_HASH160 36a8181bca44ef1fa43df647a6c8aa87ec27ca9c OP_EQUALVERIFY OP_CHECKSIG 73706b71e1c0b8310dafd3c8c4d741b2dbd6b99a00e40b5402000000 OP_DROP"
this field f73706b71e1c0b8310dafd3c8c4d741b2dbd6b99a00e40b5402000000
how he data before OP_DROP generate?