In Episode 7, we chat with Nadav Kohen of Suredbits and discuss payment points as an alternative to HTLCs on the Lightning Network.

In this conversation we cover:

Payment points (1:55)
- Blog post part 1
- HTLCs (2:00)
Timelocks (4:16)
HTLC drawbacks (5:38)
- Payment decorrelation
- Wormhole attack presented in Anonymous Multi-Hop Locks for Blockchain Scalability and Interoperability (6:35)
Point time lock contracts (PTLCs) (9:50)
- Adaptor signatures on Schnorr
Proof of payment (13:25)
Invoiceless transactions (15:05)
Hashes, pre-images, and HTLC mechanics (16:35)
Onion analogy (18:55)
PTLC mechanics (19:30)
Why don’t we use PTLCs today? (22:15)
Lightning in Scriptless Scripts posting by Andrew Poelstra March 2017
Improving proof of payment (26:10)
Stuckless payments (30:46)
Spam on Lightning (35:46)
Selling Signatures and Schnorr signatures off the main chain (36:55)
Contingent payments (39:20)
Escrow contracts (41:28)
Atomic multiparty setup and payment renegotiation (46:02)
ETA of payment points (48:02)

Thanks as always to Matthew Zipkin for the sound engineering.

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