multi: Route blinding ()

Jul 28, 2022

Host: guggero  -  PR author: ellemouton

Notes

• This is not a PR in the lnd repository, but in the lightning-onion library repository that is used by lnd. https://github.com/lightningnetwork/lightning-onion/pull/57
• See this comment about how route blinding fits in with BOLT12 (Offers).
• BOLT specification PR for route blinding: https://github.com/lightning/bolts/pull/765

Questions

• Who needs to upgrade to make route blinding work?
• What is onion routing? And how does it relate to “Sphinx”?
• Who’s privacy does route blinding improve?
• What components does a blinded route contain?
• What will be the payload for each hop in the blinded route?
• What is the difference between blinding and encrypting?
• At a very high level: How does ECDH work? How is it used in route blinding?
• How will the blinded path be communicated to the sender of a payment?
• What are the tradeoffs of using route blinding?
• What’s the difference between route blinding and rendezvous routing?