Podcasting 2.0 blip

[satoshisstream]

Thanks Lucas from LL helping drafting the blip

Based on the TLV registry: https://github.com/satoshisstream/satoshis.stream/blob/main/TLV_registry.md please find a formalized blip in this PR.

Let me know if I need to do something!

[lucasdcf]

🚀🚀🚀

[ryanthegentry]

Hi @satoshisstream, thanks so much for documenting! Some initial housekeeping, could you please:

1. rename the doc to blip-0010, given Github's numbering convention
2. include in this PR an update to blip-0002 "registering" TLV type 7629169 with name Boostagram (?) and a link to the future blip-0010. I assume this is an update_add_htlc message like keysend, so can follow that PR as an example if you'd like.
3. include in this PR an update to the README adding blip-010 (again following the keysend bLIP as an example).

[satoshisstream]

Thanks!

How about that? :)

[satoshisstream]

Thank you @t-bast . I believe I have addressed all your good comments.

[TheBlueMatt]

Thanks for taking the time to write this up!

[t-bast]

Thanks! I haven't verified the test vector myself though.

There is something that is still unclear to me, related to this comment: #10 (comment)

If you want this to work without being directly connected to the person you pay, your TLV shouldn't be in the update_add_htlc namespace, it should be in the payment_onion_payload namespace (for which you should create a new section in blip 2)?

Do note that this heavily restricts the amount of data available, as onions have a small fixed size.

[satoshisstream]

Added the payment_onion_payload part. For blip2 I just follow what you say, the chapters are a bit unclear to me. Hope I did it correctly ;)

[t-bast]

Added the payment_onion_payload part. For blip2 I just follow what you say, the chapters are a bit unclear to me. Hope I did it correctly ;)

Thanks, that looks good enough.

Unfortunately we don't have a great way to reference the onion used inside update_add_htlc (the bolts don't explicitly name it) but I think it should be easy enough to understand for readers (we do want to distinguish onions used in update_add_htlc from onions used in onion messages as they don't use the same tlvs).

Looks good to me now 👍

[ryanthegentry]

LGTM 🎉