SF Bitcoin Devs

Hosts of technical/developer-focused bitcoin meetups in San Francisco. Videos of previous talks:

[Bitcoin Optech @bitcoinoptech]

Bitcoin Optech newsletter #423 is here:

- summarizes an analysis of mining pool difficulty controllers stranding slowed miners
- describes a proposed improvement to Utreexo’s initial block download
- links to a draft BIP for specifying unspendable taproot internal keys
- summarizes changes to services/client software
- Optech Newsletter #423 Podcast

[localhost research @lclhostresearch]

Join us this evening at @PresidioBitcoin for @SFBitcoinDevs! We have a great agenda planned. https://t.co/zKWt0IuqX2

[SF Bitcoin Devs @SFBitcoinDevs]

Meetup tonight @PresidioBitcoin
9/3 6:00

https://t.co/oQpHWQJ3yG

[SF Bitcoin Devs @SFBitcoinDevs]

Bitdevs tonight at Stanford

Socratic Seminar 73 https://t.co/FW4tVxNU7q

[Bitcoin Optech @bitcoinoptech]

Rob Hamilton (@Rob1Ham), PortlandHODL (@PortlandHODL), Chandra Pratap, and fabohax (@fabohax) joined Optech to discuss Newsletter #416:

Action items
● Move funds secured by COLDCARD-generated keys (1:07)

News
● Wallets generated by COLDCARD at risk of theft (2:18)
● Disclosure of two DoS vulnerabilities in Core Lightning (36:26)
● Proof of concept for a zero-knowledge proof of reserves (49:54)

Selected Q&A from Bitcoin Stack Exchange
● What is Bitcoin's objective definition of transaction neutrality? (1:03:07)
● Why does BIP110's decentralization benefit not outweigh its impact on transaction neutrality? (1:05:17)
● Why does BIP110 require a 55% signaling threshold if its nodes reject non-signaling blocks? (1:09:46)
● Why use ElligatorSwift encoding in BIP324? (1:17:12)
● Was the OP_SUCCESSx reservation in BIP342 designed with specific opcode families in mind? (1:25:36)
● What is the difference between the long-term feerate and the discard feerate? (1:29:14)
● What is the quickest method for migrating a legacy wallet to a descriptor wallet on a pruned node? (1:32:40)
● Is there historical data on orphan/stale block rates during high-fee periods? (1:36:09)

Releases and release candidates
● BTCPay Server 2.4.1 (1:41:25)
● Eclair 0.14.1 (1:42:14)

Notable code and documentation changes
● Bitcoin Core #34628 (1:44:26)
● Bitcoin Core #28463 (1:49:49)
● Bitcoin Core #32800 (1:54:18)
● Bitcoin Core #34683 (1:56:54)
● Bitcoin Core #33014 (1:58:09)
● Eclair #3325 (1:59:31)
● BOLTs #1346 (2:00:57)
● BOLTs #1344 (2:02:10)
● BOLTs #1343 (2:04:14)

[₿ayareabitcoiners @bayareabtc]

🌉 Huge news! Announcing our inaugural Golden Gate Bitcoin Conference, this Nov 6 & 7 at the College of Marin!

This is a community & education-focused event built by bitcoiners, for bitcoiners.

Save the date! 🧵👇 (1/3)

https://t.co/VRb1H151ne

#Bitcoin #GoldenGateBitcoin

[SF Bitcoin Devs @SFBitcoinDevs]

👀👇👇👇

[nifty, ideas guy @niftynei]

if you're in SF and felt like you missed out -- i have some incredible news for you...

we're running it back next week Wednesday at @PresidioBitcoin

see you there, lamport sig pretenders 🫡🫡🫡

https://t.co/YGhBvfa1Pw

[SF Bitcoin Devs @SFBitcoinDevs]

This Thursday in SF: Socratic Seminar #70 from SF Bitcoin Devs at Presidio Bitcoin.

Bitcoin Core PRs, network stats, and research papers — debated live.

Thu May 14 · 6 PM PT
38 Keyes Ave Suite 300

https://t.co/mpZBjvucBp

[SF Bitcoin Devs @SFBitcoinDevs]

Meetup tomorrow
6:00
@DigitalGarage

https://t.co/gfhD8MEsWv

[SF Bitcoin Devs @SFBitcoinDevs]

@benthecarman @puckberley Well well well ;)

[SF Bitcoin Devs @SFBitcoinDevs]

Starting 30 minutes earlier than usual. 6:00 Thursday 3/5

https://t.co/kQ8Cv9lGHj

[SF Bitcoin Devs @SFBitcoinDevs]

Socratic Seminar Tonight At Stanford

https://t.co/syDaSuiiue

[Bitcoin Optech @bitcoinoptech]

Liam Eagen joined Optech to discuss Newsletter #390:

News
● Argo: a garbled-circuits scheme with more efficient off-chain computation (0:48)
● LN-Symmetry update (26:05)

Selected Q&A from Bitcoin Stack Exchange
● What is stored in dbcache and with what priority? (34:21)
● Can one do a coinjoin in Shielded CSV? (24:02)
● In Bitcoin Core, how to use Tor for broadcasting new transactions only? (36:47)
● Brassard-Høyer-Tapp (BHT) algorithm and Bitcoin (BIP360) (38:31)
● Why does BitHash alternate sha256 and ripmed160? (39:24)

Releases and release candidates
● Libsecp256k1 0.7.1 (41:09)

Notable code and documentation changes
● Bitcoin Core #33822 (42:59)
● Bitcoin Core #34269 (44:50)
● Core Lightning #8850 (47:38)
● LDK #4349 (49:16)
● Rust Bitcoin #5470 (50:54)
● Rust Bitcoin #5443 (51:26)
● BDK #2037 (52:51)
● BIPs #2076 (55:49)
● BIPs #1500 (59:39)

[SF Bitcoin Devs @SFBitcoinDevs]

Kick off 2026 with Socratic Seminar! This Thursday 1/8

https://t.co/4UP25N8XuG

[Bitcoin Optech @bitcoinoptech]

Anthony Towns (@ajtowns) and Mikhail Kudinov (@kudinov_mikhail) joined Optech to discuss Newsletter #386.

A notice about the wallet migration bug in Bitcoin Core was discussed at (56:30)

News
● Building a vault using blinded co-signers (1:04:09)
● Peer feature negotiation (1:40)

Changing consensus
● Year 2106 timestamp overflow uint64 migration (1:07:47)
● Relax BIP54 timestamp restriction for 2106 soft fork (1:11:36)
● Understanding and mitigating a CTV footgun (1:16:30)
● CTV activation meeting (1:21:00)
● `OP_CHECKCONSOLIDATION` to enable cheaper consolidations (1:23:11)
● Hash-based signatures for Bitcoin's post-quantum future (20:47)

Releases and release candidates
● BTCPay Server 2.3.0 (1:28:29)

Notable code and documentation changes
● Bitcoin Core #33657 (1:30:25)
● Bitcoin Core #32414 (1:33:23)
● Bitcoin Core #32545 (1:39:18)
● Bitcoin Core #33892 (1:42:13)
● Core Lightning #8784 (1:44:35)
● LND #9489 (1:45:54)
● BIPs #2051 (1:50:09)
● BOLTs #1299 (1:56:39)
● BOLTs #1305 (1:59:46)

[SF Bitcoin Devs @SFBitcoinDevs]

👇👇👇👇👍👍👍👍👍

[SF Lightning Developers @SFLightningDevs]

Meetup tonight @PresidioBitcoin
Let’s go!!

https://t.co/he8fiRFFbO

[SF Bitcoin Devs @SFBitcoinDevs]

Don’t forget the meetup is tonight 👇👇

[SF Bitcoin Devs @SFBitcoinDevs]

Meetup is this TUESDAY 11/4 this month.
At Stanford

https://t.co/EbVPBtqF40

[SF Bitcoin Devs @SFBitcoinDevs]

Meetup is this TUESDAY 11/4 this month.
At Stanford

https://t.co/EbVPBtqF40

[₿ayareabitcoiners @bayareabtc]

Let’s Gooooo
Holiday Party 12/13
12:00-3:00

https://t.co/n7F4b4vy15

[SF Bitcoin Devs @SFBitcoinDevs]

🎉 🎈 🎊

[₿ayareabitcoiners @bayareabtc]

Let’s Gooooo
Holiday Party 12/13
12:00-3:00

https://t.co/n7F4b4vy15