James Lovejoy on detecting and mitigating double-spends (EP.111)
On The Brink with Castle Island
Release Date: 08/10/2020
Weekly Roundup 12/27/24 (Tether x Rumble, quantum threat, End of year predictions) (EP.587)
On The Brink with Castle Island
Matt and Nic are back for an end of year episode. In this episode: Tether invests $775m in Rumble Who are the Rumble shareholders in Trump's admin? Microstrategy seeks approval for more Bitcoin buying We review the quantum risk to Bitcoin Matt and Nic's predictions for 2025 Sponsor notes: Coin Metrics, In Coin Metrics State of the Network Issue 291, we revisit major stories that shaped the digital asset industry in 2024 with a data-driven lens
info_outline
Janusz and Red (Bitcoin Layers) on Bitcoin Season 2 (EP.586)
On The Brink with Castle Island
and from join the show. In this episode: Innovation on Bitcoin, previously and now Technology vs consumer adoption The future of BTC use cases More about
info_outline
Weekly Roundup 12/20/24 (No SBR?, Prometheum, Crenshaw) (EP.585)
On The Brink with Castle Island
Matt and Nic are back with another week of news and deals. In this episode: Nic comes out against the SBR on Bloomberg More Prometheum nonsense MicroStrategy an additional 15,350 BTC for roughly $1.5 billion, bringing the company's total holdings to 439,000 BTC. Microstrategy was also to the Nasdaq 100 this week, which will lead to the stock's inclusion in several large ETFs including Invesco's QQQ. Anchorage Digital has New York BitLicense approval, enabling them to offer digital asset custody and trading services to more customers in the state such as RIAs and other...
info_outline
Alex Lin (Reforge) on On-chain Innovation & Consumer Use Cases (EP.584)
On The Brink with Castle Island
Wyatt sits down with . In this episode: Alex’s interdisciplinary road into crypto Innovation in blockchain infrastructure Crypto-powered consumer applications Learn more about a blockchain and frontier tech investment firm.
info_outline
Rodrigo Seira (Cooley) and Ron Hammond (Blockchain Association) on Digital Asset Policy in 2025 (EP.583)
On The Brink with Castle Island
Rodrigo Seira, Special Counsel at and Ron Hammond, Director of Government Relations at join the show. In this episode we discuss: The 2024 election and the impact of the crypto vote. Executive branch actions to keep an eye on in 2025. Potential SEC related actions that would impact the digital asset market. The future of Staff Accounting Bulletin 121. Where digital asset legislation fits into the 2025 legislative priorities. Stablecoin legislation. Market structure legislation. To learn more about Cooley visit: To learn more about The Blockchain Association visit:
info_outline
Weekly Roundup 12/13/24 (French Hill, Circle x Binance, more OCP2.0) (EP582)
On The Brink with Castle Island
Matt and Nic are back with another week of news and deals. In this episode: French Hill wins the nomination to chair the House Financial Services Committee Riot Platforms, a bitcoin mining company, the intention to raise $500 million via a convertible note offering. The proceeds will be used to acquire additional bitcoins, and for general corporate purposes. MicroStrategy another 21,550 bitcoin for roughly $2.1 billion. Circle and Binance a partnership with the goal of expanding the reach of Circle's USDC stablecoin across Binance's trading, saving, and payments platforms....
info_outline
Matthew Le Merle and Mitch Mechigian (Blockchain Coinvestors) on Predictions for 2025 (EP.581)
On The Brink with Castle Island
Matthew Le Merle and Mitch Mechigian of Blockchain Coinvestors return to the show. In this episode we run through the Blockchain Coinvestors 2025 Predictions for the digital asset industry. To learn more about Blockchain Coinvestors visit their . To view the full Blockchain Coinvestors 2025 Predictions webinar visit this .
info_outline
Weekly Roundup 12/06/24 (Bitcoin $100k, Atkins for SEC, more OCP2.0) (EP. 580)
On The Brink with Castle Island
Matt and Nic are back for another week of news and deals. In this episode: Bitcoin finally hits $100k Our reflections on 100k BTC Declaring victory Machinsky pleads guilty Rep French Hill pledges to investigate Operation Choke Point Trump nominates Paul Atkins for SEC Chair Hawk Tuah memecoin fiasco Sponsor notes: Coin Metrics State of the Network: Contextualizing staking yields, inflation, and network economics on Ethereum & Solana
info_outline
Lorien Gabel (Figment) on the Latest Developments in the Staking Market (EP.579)
On The Brink with Castle Island
Lorien Gabel, the founder and CEO of joins the show. In this episode we discuss: The latest developments at Figment. Post-election impact on the general crypto markets and the staking category. How Figment is approaching the institutional staking market opportunity. Staking in the context of investment products. Evolving ecosystems like Eigen Layer, Babylon and Bitcoin Layers 2s. The stablecoin market. To learn more about Figment visit
info_outline
Weekly Roundup 11/28/24 (OFAC loses vs Tornado, Cantor owns some Tether, More OCP2.0, Who we’re thankful for) (EP.578)
On The Brink with Castle Island
Matt and Nic are back for another Thanksgiving episode of OTB. In this episode: Fire departments love thanksgiving Who we’re thankful for Eggnog is underrated Justin Sun puts $30m into World Liberty Financial Marc Andreessen appears on Joe Rogan and covers OCP 2.0 Why were non crypto tech peopled shocked by Choke Point revelations? Trump is looking to shift power from the SEC to the CFTC An appeals court rules that OFAC exceeded its authority by sanctioning Tornado Cash Cantor owns a 5% ownership stake in Tether that they acquired at a $12b valuation How prudent is the establishment of a...
info_outlineJames Lovejoy, recent MEng MIT grad and former graduate researcher at the MIT Digital Currency Initiative, joins the show to talk about his masters thesis and associated project focusing on detecting double-spends in proof of work cryptocurrencies. Previously, little data was collected in a systematic way to detect double-spends and reorganizations across many cryptocurrencies. James' project sheds light on previously unknown security properties of PoW. In this episode:
- How James came to work on Vertcoin
- Why James thinks ASIC resistance is valuable
- James' blockchain monitoring project and why it matters
- Why reorgs are challenging to detect
- Why investigating the economic damage of reorgs is difficult
- How James noticed a 51% attack in progress on Vertcoin and intervened to save Bittrex money – and how this can be replicated
- Why understanding Nicehash is critical to detecting and dealing with 51% attacks
- James' critiques of dominant theoretical models of PoW security
- How James found reorgs and counterattacks happening on BTG in real time
- Why exchange processes like KYC might actually help protect blockchains from reorgs
- How permissionless trading and leverage makes certain blockchains more vulnerable to attacks
- Rules of thumb for confirmation requirements for exchanges
- The issue with calling coins "Nicehash-able" – and why it's likely a lowball
- How exchanges can proactively mitigate the risk of 51% attacks and what they should be targeting
- How BTG developers finally defeated deep reorgs
- Whether James is confident in the long-term prospects of PoW
- Whether James still believes in GPU mining
Content referenced in this episode
- James Lovejoy, An Empirical Analysis of Chain Reorganizations and Double-Spend Attacks on Proof-of-Work Cryptocurrencies
- Raphael Auer, Beyond the doomsday economics of “proof-of work” in cryptocurrencies
- Eric Budish, The Economic Limits of Bitcoin and the Blockchain
- Hasu, Prestwich, and Curtis, A model for Bitcoin's security and the declining block subsidy
- Carlsten, Kalodner, Narayanan, Weinberg, On the Instability of Bitcoin Without the Block Reward
- Moroz, Aronoff, Narula, Parkes, Double-Spend Counterattacks: Threat of Retaliation in Proof-of-Work Systems
- Judmayer et al, Pay-To-Win: Cheap, Crowdfundable, Cross-chain Incentive Manipulation Attacks on Cryptocurrencies
- Liao and Katz, Incentivizing Blockchain Forks via Whale Transactions
- James Lovejoy and David Vorick, ASICs and cryptocurrencies: benefits and drawbacks [debate]
- Nic Carter, It's the settlement assurances, stupid [blog]
- Elaine Ou, Cryptocurrency Deals can Always be Erased, for a Price [article]