📅 Original date posted:2015-07-22
📝 Original message:Rather than re-enable OP_LEFT, a NOP could be re-purposed in a soft fork.
OP_DUP OP_HASH160 [pubKeyHash[:LEN_PARAM]] [LEN_PARAM] OP_LEFTEQUALVERIFY
OP_DROP OP_CHECKSIG
A B L OP_LEFTEQUALVERIFY checks if the leftmost L bytes of A and B match.
If not, then the script immediately fails. If either array is less than L
bytes or if there are fewer than 3 values on the stack, then it also fails.
The OP_DROP is needed as the new opcode must count as a NOP for legacy…