Good morning Stepan, and Nadav,

Both additions seem good idea to me.

> - Sally generates the invoice with the preimage `S` (i.e. x-coordinate of 
> this point to make it 32-bytes long)

Does this require Bob to attempt both positive and negative sign for the 
y-coordinate?
Alternately we can force Sally to always use a scalar such that generated point 
has a fixed sign (or some other property to derive the sign of the missing 
coordinate).

Regards,
ZmnSCPxj
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