Sergi Delgado joins us to discuss Watchtowers, his prior work in Bitcoin and Lightning privacy, Python vs. Rust and the impact of Eltoo.

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We cover:

• Sergi’s prior research

• Mapping Network Topology Research (02:46)
  • TxProbe paper
  • Andrew Miller
  • Coinscope
  • Episode on Address Relay with Martin (04:28)
  • Block-only connections PR by Suhas (07:32)

• An Empirical Analysis of Privacy in the Lightning Network (09:18)

• Lightning white paper, 2016 (09:48)
• Security and Privacy of Lightning Network Payments with Uncertain Channel Balances (13:38)
• Episode with Sergei on Probing
• Channel Jamming paper (13:50)

• Episode with Clara and Sergei

• Should we pay for failed payments? (14:19)
  • HTLC withholding vs. HTLC hodling (15:48)

• Is Lightning flawed when it comes to privacy? (16:32)

• Watchtowers (17:44)
  • Python PoC (21:49)
  • ZmnSCPxj’s writing watchtowers
• Building on LDK (24:20)
  • Transition to rust (24:45)

• Altruistic towers vs professional services (30:21)

• More privacy considerations in Lightning (34:11)

• Monitoring and reacting paradigm (44:04)

• Storage and Eltoo (50:06)

• Professional tower revenue models - subscription vs. bounties (53:00)