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> I wonder if this is possible as a soft fork without using segwit? Increasing the sigop count for a NOP would be a hard fork, but such a change would be fine with a new segwit version. It might require specific support in the altcoin, which might be troublesome..
It is a soft fork since it makes things that were previous allowed disallowed. If it decreased the sigop count, then you could create a block that had to many sigops due to the old rules.
With this rule, it increases the count. If the sigop count is valid under the new rules, it is also valid under the old rules.
There is no need for specific support on the altcoin. It allows the Bitcoin network act as trusted 3rd party so that you can do channels safely on the altcoin, even though the altcoin still suffers from malleability and doesn't have OP_CHECKLOCKTIMEVERIFY.
With regards to seg-witness, Ideally, the opcode would work in both old and new scripts by re-purposing OP_NOP3.
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