OP_CAT to BIP 0003 format, add usecase

[EthanHeilman]

• Add two use cases to motivation
• Add BIP 003 versioning

[murchandamus]

If you have have concluded all planned work on this proposal, have you considered advancing this BIP to Complete?

[EthanHeilman]

@murchandamus From a content perspective, I don't plan to add anything else. If @arminsabouri agrees, I see no reason not to mark it as complete.

If at some future point, in response to rough consensus we may create an activation client, I plan to document the activation details in this BIP. Rereading BIP 0003, it doesn't say it explicitly, but it seems like the intention is for this to be done after the BIP is complete as part of preparing the BIP for deployed status. I'm I understanding BIP 0003 correctly here?

[arminsabouri]

Ack e681ec8

[murchandamus]

Ethan wrote:

If at some future point, in response to rough consensus we may create an activation client, I plan to document the activation details in this BIP. Rereading BIP 0003, it doesn't say it explicitly, but it seems like the intention is for this to be done after the BIP is complete as part of preparing the BIP for deployed status. I'm I understanding BIP 0003 correctly here?

You’re right, there is so far no explicit guidance regarding when the activation mechanism would be expected or how it should be formatted. Given that any deployment strategy matters only temporarily and doesn’t otherwise impact the content of the Specification, it seems reasonable to me that the activation mechanism may be added after a BIP is moved to Complete.

[murchandamus]

Do you feel that this proposal needs test vectors? If so, they should be added/referenced for it to be moved to Complete.
The Elements implementation does appear to have some that could perhaps be adapted: ElementsProject/elements@9fea017

[EthanHeilman]

Good point! The reference implementation does have test vectors. I'll update this PR with them when I get a moment

[murchandamus]

Great thanks!