Bitcoin DeFi: Dead or Alive? Jacob Phillips on Collateral, Custody, and Yield

In episode six of the Bullish on Bitcoin Show, BOB co-founder Alexei Zamyatin sat down with Jacob Phillips, co-founder of Lombard — one of Bitcoin DeFi's most successful protocols, best known for LBTC. Phillips came to Bitcoin from the DeFi investing side rather than as a lifelong Bitcoiner, having spent over three years at Polychain before recognizing what he called an obvious opportunity: a trillion-plus dollars in idle Bitcoin sitting alongside a DeFi ecosystem that was, relatively speaking, starving for capital. The conversation that followed was a candid look at whether the Bitcoin DeFi hype cycle actually delivered anything durable — and what's left standing now that the incentives have dried up.

Here's a rundown of the highlights.

From "DeFi Guy" to Bitcoin Native

Phillips described his journey into Bitcoin as backwards from the typical path: he was a DeFi builder who saw Bitcoin's scale as an untapped opportunity, rather than a Bitcoin holder who discovered DeFi. Lombard's timing coincided with the Ethereum staking and restaking boom, which created the first real catalyst for bringing Bitcoin on-chain through a comparable staking mechanism. He noted that the deeper he's gone, the more he's found that Bitcoin's biggest pockets of capital are only reachable by becoming genuinely Bitcoin-native rather than approaching the ecosystem purely from the DeFi side.

Alexei agreed that Bitcoin is a uniquely difficult community to navigate, precisely because it predates every other crypto ecosystem and has attracted people for wildly different reasons — long-term savers, the debanked, ideological holders — rather than primarily speculators. As he put it, teams that try to "speedrun" Bitcoin tend to get chewed up and spit out by a community that doesn't respond to the usual crypto onboarding playbook.

Is "Productive Bitcoin" Even the Right Framing?

Phillips pushed back on a narrative he sees repeated constantly across Bitcoin DeFi: that Bitcoin needs to be made productive. In his view, Bitcoin is already extremely productive — just mostly off-chain, historically underpinning centralized exchange derivatives, Deribit's early BTC-margined markets, and the collateral base behind lenders like BlockFi and Celsius before their collapse. His pitch today, he said, isn't "make your Bitcoin productive" — it's convincing people who are already using their Bitcoin somewhere off-chain that doing it on-chain is simply a better product.

"I almost find myself pitching the benefits of on-chain finance at this point, more than I pitched the idea of productive Bitcoin... Now that the pitch is like, why should I use it on-chain?"

Alexei agreed, noting that most large Bitcoin holders have a fundamentally low risk appetite — the worst outcome for an OG Bitcoiner isn't missing out on yield, it's losing the Bitcoin. He pointed to the early controversy around Merlin's TVL — where staked Bitcoin was really just sitting with a custodian — as a symptom of trying to solve an impossible request: yield with zero custody risk, the "holy grail" that keeps tripping up would-be Bitcoin DeFi protocols.

Where Does Bitcoin Yield Actually Come From?

Phillips was blunt about the economics: on-chain trading volume and capital simply aren't large enough yet to organically sustain the yields needed to pull meaningful Bitcoin into DeFi. Most current "Bitcoin yield" is really off-chain trading activity that's been tokenized and represented on-chain — a legitimate bridge, in his view, but not yet a sign of a self-sustaining on-chain Bitcoin economy. He cited Lombard's own vault with a partner named Centora running a rate-arbitrage strategy as an example of real but still modest-scale fundamental yield, capped in the low hundreds of millions rather than the billions the space ultimately needs.

Alexei tied this back to concrete BOB data: users of BOB's Gateway moving Bitcoin into wrapped assets overwhelmingly head toward trading and yield-basis-style strategies, or use BTC as collateral to earn while others trade on top — reinforcing that collateral and yield extraction, not speculative "gambling," are what's actually driving on-chain Bitcoin demand today.

Collateral: The One Use Case With Real Product-Market Fit

Both agreed that among all the Bitcoin DeFi use cases tried since 2024, one has clearly won: Bitcoin as collateral. Phillips pointed to Lombard's own LBTC trajectory as the clearest evidence — growing from zero to a billion dollars in ninety days during the staking-incentive boom, eventually scaling past two billion, before yields collapsed from three to four percent down to a fraction of a percent once external incentives dried up. He's now preparing to launch what he called "LBTC phase two" within the next month or two, aiming to recapture that early excitement through fundamentally collateral-driven demand rather than temporary token incentives.

Alexei connected this to Bitcoin's own DeFi history, noting that WBTC's supply only exploded once MakerDAO accepted it as collateral for minting DAI — a pattern he sees repeating today, where the majority of Bitcoin genuinely deployed in DeFi (as opposed to sitting in more self-custodial "opportunity vaults") is being used as collateral.

The Custody Problem Nobody Can Fully Escape

Phillips argued that some of Bitcoin DeFi's early marketing did real damage by promising something economically incoherent: yield with zero custody risk. If a Bitcoiner's coins never actually leave their control, he explained, there's no way for a lender to be confident they'll get repaid — and no fundamental yield can exist without some real exposure to loss. Alexei agreed, framing it plainly: nobody lends dollars against Bitcoin they can't seize if the borrower defaults, and that basic requirement is unavoidable no matter how clever the cryptography gets.

Real progress, Phillips said, isn't removing that risk entirely — it's reducing it. Better failsafes mean that if a borrower repays their loan, they reliably get their Bitcoin back.

On-Chain Finance vs. "Pure" DeFi

Alexei drew a distinction he sees as increasingly important: on-chain finance (bringing existing financial activity, like RWAs or Bitcoin lending, onto better rails) versus DeFi in the purist, native-innovation sense. He argued Bitcoin DeFi should be understood the same way RWA issuers approach traditional assets — competing directly against off-chain alternatives on user experience, not on ideology:

"The next big unlock is going to be people who don't necessarily care whether it's DeFi or not. They care about the end product... Is it cheaper for them to borrow? Can they spend better?"

Both pointed to Coinbase's Bitcoin-backed lending product — reportedly charging 2% origination fees while still processing roughly $2 billion in originations — as striking proof that a large, underserved pool of Bitcoin holders will pay real money for a better borrowing experience, even one that quietly runs on DeFi rails like Morpho behind the scenes.

Institutional vs. Retail: Which Comes First?

Phillips said Lombard is currently focused on institutional counterparties, since institutions already borrow against Bitcoin off-chain at scale and stand to gain the most from lower, more transparent on-chain rates. But he was careful not to write off retail, citing repeated evidence of strong non-institutional demand — a segment some in the industry call "pro-tail" — and noted Lombard's newer Bitcoin Smart Accounts product will likely launch to retail and pro-tail users first before institutional rollout.

Sentiment, Quantum Fears, and the Strategy Dividend Question

Closing on market sentiment, Phillips offered a striking observation on the current bear market: institutional Bitcoin LPs express real caution around quantum computing risk not because they've concluded it's an imminent threat, but because uncertainty itself makes people nervous, especially when prices are falling. He argued Bitcoin's fundamentals — sovereign adoption, clear de-correlation from other assets during stress events — have arguably never been stronger, even as sentiment lags behind:

"This is the first time in crypto's history where fundamentals have outpaced price... those with a long-term perspective will be rewarded."

Alexei agreed, adding that he sees the current environment as a good buying opportunity, pointing to unresolved catalysts like a potential U.S. strategic Bitcoin reserve and rising geopolitical instability as reasons demand could accelerate from here — while reiterating that this reflects personal opinion, not financial advice.

Watch the Full Episode

This recap covers the main threads, but the full conversation goes deeper on Bitcoin Smart Accounts, the institutional-retail feedback loop, and what a more fundamentally-driven Bitcoin DeFi cycle could look like next. Watch the complete episode of the Bullish on Bitcoin Show with Jacob Phillips here:

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