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lnbook/onion-routing-htlc-forwarding.asciidoc
2020-05-05 20:46:48 -07:00

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Chapter overview:
* introduce multi-hop HTLC forwarding + onion routing at a lower level
Relevant questions to answer:
* Onion Routing:
* What is onion routing? What security guarantees does it offer?
* What is the Sphinx format? How does it differ from prior mixnet packet formats?
* How does DH randomization work? (possibly too low-level)
* Why is it important to keep the packet fixed sized at all times?
* What routing information is contained in the payload for an node?
* How can the routing information be extended in the future?
* HTLC Forwarding:
* How does a node gain fees when it forwards a payment?
* What is the "cltv delta" why does it matter?
* What does a successful HTLC forwarding look like?
* How can a node cancel back an HTLC off-chain?
* What is a typical network switch/hub? How can a similar analogy be applied to forwarding HTLCs?
* What is the circuit map, why does a node need to maintain this?
* Can fails or settles be safely pipelined on the network?
* How does a node send an error back to the sender without knowing who they are?
* What dangers exist w.r.t time-locks and timely on-chain confirmation?