Good morning Luke and list,

> (Aside, in case it wasn't clear on my previous email, the template-script idea
> would not make it mandatory to spend in the same block, but that the UTXO
> would merely cease to be valid after that block. So the 0-value output does
> not take up a UTXO db entry when left unused.)

Thank you for clearing this up.  It seems, I misunderstood.  So my earlier 
rumination, about having two options for Lightning, is incorrect.

For Lightning, we just need to add this 0-value OP_TRUE output always to 
transactions that require both side signatures (commitment, HTLC-timeout, 
HTLC-success), and it will always serve as a "hook" for  adding more fees if 

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