Bitcoin Optech Newsletter #430

Bitcoin Optech Newsletter #430 outlines key developments in the Bitcoin ecosystem, focusing on the continued discussion surrounding TCP hole punching. This technology aims to make Bitcoin nodes behind home routers more reachable, supplementing existing port forwarding methods, as default NAT-PMP in Bitcoin Core 30.0 did not achieve desired reachability. The initiative, led by 0xB10C, involves active work on a new specification and an experimental Bitcoin Core implementation. The primary goal is to increase the number of honest, reachable nodes, thereby making it more challenging for attackers to monopolize connection slots. A new coordinator-free design proposed by 0xB10C suggests nodes announce punchable addresses and temporary public keys in a new addr v2 type, with coordination derived from shared secrets and new blocks. Following concerns from Anthony Towns about potential flooding, an alternative "message board" approach is being explored, where listening nodes would curate verified addresses of home nodes looking for peers. Additionally, the newsletter discusses a draft BIP to standardize spending policies for co-signers when emulating covenants and covers regular updates on consensus rule changes, new releases, and infrastructure software.

American Bitcoin’s $126M profit masks mining pressure as rivals turn to AI

American Bitcoin, a mining company publicly backed by Eric Trump, reported a significant quarterly net income of $126 million. This substantial profit was largely a result of gains realized on its existing Bitcoin holdings. The company achieved these favorable financial results despite facing increasing operational headwinds, including a general rise in the costs associated with Bitcoin mining and the sustained pressure of shrinking profit margins across the competitive mining landscape. The article also notes an emerging trend where some rival mining operations are diversifying their business models by turning towards artificial intelligence ventures, which further intensifies the competitive environment for traditional Bitcoin mining firms.

Bitcoin Fixes This? Paraguay President Resigns After Bank Lockout Hits 60% of Country

The financial crisis in Paraguay, caused by the collapse of Ueno bank, resulted in millions of depositors losing access to their funds. This significant event triggered the resignation of the country's president and has brought renewed attention to Bitcoin's fundamental argument for self-custody, emphasizing its role as a censorship-resistant and sovereign alternative to traditional banking systems prone to failure and lockouts.

Core Scientific (CORZ) to Exit Bitcoin Mining by Year-End as Colocation Hits $215 Million

Core Scientific (CORZ) is strategically pivoting away from Bitcoin mining operations, with plans to fully exit the sector by the end of the current year. The company anticipates completing the wind-down of its self-mining activities in the fourth quarter, aiming to transform into a dedicated AI colocation landlord by 2027. This shift is highlighted by a significant reduction in self-mining revenue, which has already decreased to $12.3 million.

Payjoin Trading: A Novel Approach to UTXO Consolidation and Privacy

Trump-Backed American Bitcoin Turns a Profit as Bitcoin Rise Lifts Books

A mining company, identified as 'Trump-Backed American Bitcoin' and supported by Hut 8, successfully reversed its financial losses from the second quarter. This positive shift was overwhelmingly driven by a substantial $197 million gain derived directly from the company's Bitcoin holdings. The article highlights that the broader increase in Bitcoin's market value played a crucial role in improving the company's financial results, effectively 'lifting its books'.

Bull Bitcoin Becomes First Exchange to Add Payjoin Privacy Deposits, Withdrawals, and Payjoin-by-Default Trading

Bull Bitcoin has become the first Bitcoin exchange to fully integrate Payjoin technology, offering it as a default option for both deposits and withdrawals. This significant development means that every on-chain buy or sell transaction processed through Bull Bitcoin's BULL Wallet will now automatically utilize Payjoin. The implementation aims to enhance user privacy by obscuring transaction details from chain analysis, as well as providing tangible benefits such as automated UTXO aggregation. This process not only helps users reduce their future mining fees by consolidating inputs more efficiently but also contributes to a smaller overall Bitcoin UTXO set. The initiative was highlighted by Bitcoin Magazine, emphasizing its importance for advancing privacy within the Bitcoin ecosystem and streamlining on-chain operations for users.

Bitcoin crashes 6% to 7-week low as US stocks erase election gains

U.S.-Sanctioned Moscow Exchange Will List Bitcoin on Dec. 1 as Russia Pulls Crypto Trading Home

The Moscow Exchange, Russia's largest financial marketplace, which is currently operating under U.S. sanctions, is slated to commence Bitcoin trading services on December 1. This strategic initiative is being rolled out in alignment with the nation's newly established cryptocurrency legislation, indicating a concerted effort by Russia to repatriate and regulate crypto trading within its domestic financial system. As part of these new regulatory stipulations, retail investors who wish to participate in Bitcoin trading on the exchange will be required to pass specific assessments and will be subject to an annual investment limit of 300,000 rubles.

Bitcoin Price Trades Near $79,600 as Oil Rebounds and Bank of England Hikes Rates

Bitcoin Amsterdam 2026 | Day 1 Livestream

This article pertains to the 'Bitcoin Amsterdam 2026 | Day 1 Livestream,' indicating a live broadcast or recorded footage of the inaugural day of the annual Bitcoin Amsterdam conference. As a prominent global event dedicated exclusively to Bitcoin, the livestream would feature a comprehensive agenda covering the latest developments, insights, and discussions across the Bitcoin ecosystem. Viewers could expect to witness keynote speeches from leading Bitcoin developers, economists, and advocates, alongside panel discussions addressing critical topics such as advancements in the Bitcoin protocol, the evolution and adoption of the Lightning Network for faster payments, the macroeconomic implications of Bitcoin's rise, and evolving regulatory landscapes affecting the asset. The event also typically delves into areas like Bitcoin mining, self-custody best practices, privacy-enhancing technologies, and strategies for achieving financial sovereignty. The Day 1 livestream would likely capture opening remarks, foundational presentations, and significant announcements, setting the stage for the multi-day conference and providing invaluable signal for anyone interested in the future of Bitcoin.

Bitcoin is resilient, but leverage is missing and demand still tepid

Trump-linked American Bitcoin swings to $126 million profit but misses revenue estimates

American Bitcoin, a company reportedly linked to former President Trump, achieved a $126 million profit despite falling short of its revenue projections for the third quarter. The company's revenue reached $63.4 million, missing analysts' forecasts. This shortfall was primarily attributed to a decrease in overall bitcoin production. Furthermore, the company experienced an increase in operational costs associated with mining activities, driven by higher electricity prices during the summer months.

The SN Daily Putt #177: Play, Putt, Score, ZAP!⚡️⛳️

Biggest Channel Opened Today (2.0 BTC) + New Node Spotlight (0329427c0f5f2c483…)

BOLT12 Pay v0.3.20 — Now Available in Five Languages

Any stackers at bitcoin++ Seoul, privacy edition?

Trump Media moves $342 million in bitcoin to Crypto.com, blockchain data show

American Bitcoin (ABTC) Posts $126 Million Profit as Holdings Gain $197 Million

American Bitcoin (ABTC) reported a significant financial turnaround in its third quarter, achieving approximately $126 million in net income. This substantial profit was primarily driven by a $197.3 million gain from its bitcoin holdings. This positive performance marks a reversal from the previous quarter, during which the company had experienced a $57.2 million loss.

Why Bitcoin's Next Soft Fork Could Feel Like a Practice Run

The article details Matt Corallo's perspective on an upcoming Bitcoin soft fork, highlighting its multifaceted importance beyond simple bug resolution. While the primary goal involves patching four legacy bugs crucial for ongoing Bitcoin maintenance, Corallo emphasizes that this soft fork also serves as a vital exercise in "rebuilding muscle memory" within the Bitcoin ecosystem. This suggests the process is not merely about technical fixes but also about reactivating and refining the community's processes for activating protocol upgrades. It acts as a critical practice run, preparing developers, node operators, and the wider community for potential future, more complex, or contentious protocol changes. This dual function ensures both immediate technical hygiene and long-term operational readiness for the Bitcoin network.

Why isn't bitcoin used for more gray market things?

How Aussie Bitcoiners can avoid 2027’s shock CGT hike: Part 1

This article, part one of a series, outlines crucial strategies for Australian Bitcoin holders to navigate and mitigate the impact of the anticipated significant Capital Gains Tax (CGT) increase slated for 2027. The content explores several proactive approaches individuals can consider to protect their Bitcoin wealth from the impending tax changes. Key strategies discussed include leveraging specific financial structures such as Self-Managed Superannuation Funds (SMSFs) or establishing a company to potentially benefit from different tax treatments or deferrals on Bitcoin gains. Furthermore, the article provocatively touches upon more drastic measures, like the option of emigrating from Australia entirely, as a means to circumvent the domestic tax regime. The core aim is to provide Australian Bitcoiners with actionable insights and pathways to safeguard their financial sovereignty against evolving regulatory landscapes and substantial tax hikes, fostering long-term wealth preservation.

Matt Corallo Flags Critical Linux Kernel Flaw; Lightning Labs Ships LND Mitigation

Bitcoin Core and Lightning developer Matt Corallo recently identified a severe Linux kernel vulnerability, CVE-2026-98432, on October 30. This flaw, a use-after-free bug within the IPv4 TCP handshake code, received a critical CVSS score of 9.8. Researchers from Anthropic’s Frontier Red Team successfully demonstrated a remote root exploit against systems configured with a Multipath TCP listener, highlighting the gravity of the issue. In response to this critical finding, Lightning Labs, a key developer in the Bitcoin Lightning Network ecosystem, promptly released a mitigation for its Lightning Network Daemon (LND) to protect its users and infrastructure from this potential threat. The original report was published in Bitcoin Magazine by Juan Galt.

Jack Dorsey’s Block (XYZ) Sets Aside $764 Million for DOJ Settlement as Bitcoin Profit Halves