The Chaincode Podcast Chaincode Labs

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)

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)

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

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)

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)

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)