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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