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..

On 11 Feb 2016 20:05, "Tier Nolan via bitcoin-dev" <bitcoin-dev@lists.linuxfoundation.org> wrote:
There was some discussion on the bitcointalk forums about using CLTV for cross chain transfers.

Many altcoins don't support CLTV, so transfers to those coins cannot be made secure. 

I created a protocol.  It uses on cut and choose to allow commitments to publish private keys, but it is clunky and not entirely secure.

I created a BIP draft for an opcode which would allow outputs to be locked unless a private key was published that matches a given public key.
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