The Chaincode Podcast

Chaincode Labs
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A podcast about Bitcoin protocol development

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    Rusty Russell and privacy and robustness in Lightning - episode 34

    Rusty drops by to tell us about why privacy and robustness should be prioritized in Lightning. We discuss: LN symmetry (04:39) Do we want LN Symmetry to be symmetrical? (05:12) Listen to the conversation with instagibbs Peer to peer protocol (13:30) CTV (16:54) Pushing privacy and robustness to the front of the line (20:33) The dynamics of developing a spec with commercially associated implementations (22:19) Expecting new implementations (26:22) Privacy revisited (27:02) What broke when fee rate spiked? (31:21)

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    Elle Mouton⁠, Oliver Gugger⁠ and Simple Taproot Channels - Episode 33

    Elle Mouton and Oliver Gugger join us to talk with us about the Simple Taproot Channel proposal. We cover: Simple Taproot Channels Overview (1:29) What’s the state of the spec? (3:06) Changes to the scripts in Taproot Channels (4:31) Refresher on CPFP carve-out and Anchor Outputs (8:19) Why Anchor Outputs need to use script path spends (10:24) Other goals of Simple Taproot Channels (15:52) Why do PTLCs need Taproot funding outputs? (16:44) Potential updates for the gossip protocol: Gossip 1.5 or Gossip 2.0 (18:13) PTLCs (25:22) Iterative approach or big push (27:19) Recoverability of channel funds (33:06)

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    Alekos Filini, Daniela Brozzoni and the Bitcoin Development Kit (BDK) - Episode 32

    Alekos Filini and Daniela Brozzoni visit the podcast to discuss the Bitcoin Development Kit (BDK). Hang out with them on the BDK Discord. We cover: How BDK started (00:48) Why is it named BDK and not the Magical Bitcoin Library? (2:10) The first users of BDK (3:30) Rust HWI (4:20) Built around descriptors (7:15) The ideal use case of BDK (7:30) Pain points (9:05) Why do devs keep building wallets from scratch? (10:05) Greenwallet (13:03) If you have a working wallet, should you switch to BDK? (16:25) HWI complaints (see Python) (17:41) BDK 1.0 release features (22:31) Sync Planning module

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    Tadge Dryja and Lightning History and everything else - Episode 31

    Tadge Dryja chats with us about writing the Lightning Network paper and working in the Bitcoin space. We discussed: Could blocks be bigger? (0:59) Paper: On the instability of Bitcoin without the block reward (9:49) Serving billions with Lightning (10:40) The state of the debate when writing the Lightning Network White Paper (13:35) Would Lightning be possible without Segwit? (17:20) Looking in from outside on a project you started (18:54) Trimmed HTLCs: Sending 1 sat vs 100,000 sats (22:02) Limitations of the Lightning network (25:31) Do high fees break lightning? (28:24) LN-Symmetry (Eltoo) (31:50) SIGHASH_ANYPREVOUT (33:20) Why are soft forks so hard? (34:15) What’s your wish list (hardfork wishlist wiki, softfork wishilist wiki) for protocol changes? (36:18) coinpools Bitcoin needs to become more usable (37:54) Tadge's thoughts on Education (44:17) MAS.S62: Cryptocurrency Engineering and Design Dynamics of working on Bitcoin (47:16)

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    Andrew Chow and the Bitcoin Core Wallet - Episode 30

    Andrew Chow joins us to discuss Bitcoin Core wallet development, PSBT, Output Descriptors, and HWI. We cover: - Why do we need a wallet in Bitcoin Core? (0:58) - Refactoring the Wallet codebase to build Output Descriptors (5:59)Should we rewrite the wallet? (10:30) - Changes to Coin Selection (11:35) - Wallet interoperability (17:10) - Hardware Wallet Integration (HWI) (18:20) - Partially Signed Bitcoin Transactions (PSBT) (19:01) - Becoming Maintainer (22:06) - Tracking the UTXO pool (23:43) - Main components of the Bitcoin Core Wallet (26:00) - Who uses Bitcoin Core Wallet? (27:02)   - Survey Results - What’s the future of the GUI? (29:21)   - Bitcoin Core GUI  - Bitcoin Core GUI-QML - Switch to Descriptor-based wallets (32:52)

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    Greg Sanders, SIGHASH_ANYPREVOUT, ephemeral anchors and LN symmetry (ELTOO) - Episode 29

    Greg Sanders joins us to discuss ANYPREVOUT, ephemeral anchors and LN symmetry (a.k.a. ELTOO). We chat about: - Package relay (2:07) - Pinning attacks (3:14)   - BIP125   - T-Bast’s pinning attack summary - Mempool policy (4:56) - Stuffing the mempool - 2017 (5:20) - Rewrite mempool or make the problem simpler (07:57) - Package relay RBF A.K.A. V3 (8:38) - Reducing the standard transaction size to 65 bytes PR (14:25) - March to LN symmetry (19:07) - Daric: A Storage Efficient Payment Channel With Penalization Mechanism - Two-party eltoo w/ punishment by AJ Towns - BIP118 - SIGHASH_ANYPREVOUT (26:17)   - SIGHASH_NOINPUT - Softfork and activation history (28:11) - Ephemeral anchors (32:18)   - op_2 email by Luke - Is ANYPREVOUT useful outside of LN symmetry? (43:27)

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    Sergi Delgado and Watchtowers, Lightning Privacy - Episode 28

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

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    Pieter Wuille and Tim Ruffing - Nesting, ROAST, Half-Aggregation, Adaptor Signatures (part 2)

    We continue the conversation with Pieter Wuille and Tim Ruffing and Nesting, ROAST, Half-Aggregation, Adaptor Signatures, atomic swaps and more. If you have not tuned into the first part of this conversation, we recommend listening to that one first. We cover: - Nesting (00:49) - ROAST (12:09) - Cross-input Signature Aggregation (18:49) - Half-aggregation (34:32)   - Half-Aggregation of BIP 340 Signatures and BIP340 - Adaptor signatures and atomic swaps (39:32) Further resources: Stephan Livera Podcast #400 Jonas Nick and Tim Ruffing - Half Signature Aggregation

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A podcast about Bitcoin protocol development

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    Chaincode Labs
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    The Chaincode Podcast