Authenticate use of offer blinded paths (Blinded Paths, Compact Blinded Paths, Bolt12, Offer, Auth)

Jul 19, 2024 18:00 UTC in the #review-club channel on our Discord server.

https://github.com/lightningdevkit/rust-lightning/pull/3139

Host: vincenzopalazzo  -  PR author: jkczyz

Notes

Questions

1. Did you review the PR? Concept ACK, approach ACK, tested ACK, or NACK?
2. Why do we need an authentication method in BOLT12, specifically during the invoice request?
3. Is the authentication algorithm specified inside the BOLT12 proposal, or is it used for an LDK use case?
4. After this PR, will LDK be retrocompatible with previously generated offers?