Bitcoin fell from above $72,000 to under $62,000 in the first week of June 2026. Billions in leveraged longs got liquidated. If you want to know whether a borrowing design actually works, this is the only week that tells you, not the green ones.

So here's what a 0%-interest Money Protocol vault did while the screen was red:

The debt didn't move. You lock RBTC (Bitcoin on Rootstock), mint BPD (a dollar-pegged stablecoin) against it, pay a one-time fee and 0% after. A loan opened in May is the same size in June.

One number did move: your collateral ratio. Debt is fixed in dollars, collateral is priced in Bitcoin, so the ratio fell as BTC fell. The protocol enforces a 110% minimum, the same published line for every vault, enforced by code. No margin desk, no discretionary call.

The backstop was already funded. Liquidated vaults get absorbed by the stability pool, users who deposited BPD on purpose and get paid in discounted Bitcoin for it. No outside bailout.

The peg held by math. BPD stays near $1 because anyone can redeem it for $1 of RBTC, so if it dips, arbitrage drags it back.

Honest part: a vault isn't a force field. Break the 110% line and you're liquidated. In a severe crash, Recovery Mode can raise the bar to a 150% system ratio. Open with room, keep a cushion.

The whole long-term-holder thesis in one line: the moment you'd least want to sell your Bitcoin is the moment this is built for.

Short version: Aave and Money Protocol both let you borrow against crypto without selling. One was built for Ethereum assets. One was built for Bitcoin holders who never wanted to leave.

Aave is the giant of on-chain lending. It is self-custodial, battle-tested, and if you hold ETH or stablecoins, it is an excellent place to borrow against them. But Aave is an Ethereum-world product. To borrow against Bitcoin there, you first have to turn your Bitcoin into a wrapped token, bridge it, and accept a variable interest rate that floats with market demand. Each step adds a dependency a Bitcoiner did not sign up for: a wrapping custodian, a bridge, and a rate that can spike when you least want it to.

Money Protocol is built the other direction. It is self-custodial like Aave, but native to Bitcoin via Rootstock. Deposit RBTC (Bitcoin on Rootstock) into a smart contract and it becomes your vault. Mint BPD, a USD-pegged stablecoin, against it. Pay 0% interest — a one-time fee, not a floating APR that moves against you. Repay whenever; no term; get your RBTC back. Both are self-custodial. The difference is the detour: Aave needs you to wrap and bridge first, Money Protocol keeps you in the Bitcoin economy the whole time.

On Diigo The browser signed out at some point between earlier sessions and now. Once you sign back in to @moneyprotocol on Diigo, I can drive the post. The content + tags + URL target are ready in 2026-05-18-web2-diigo-cross-post.md.

Three years. That's how long it's been since the CeFi Bitcoin lender failures of 2022.

Long enough that the bankruptcy proceedings have produced actual numbers. Long enough that the recovery percentages — for the customers who sent their Bitcoin to Celsius, Voyager, BlockFi, Genesis — are no longer hypothetical. Long enough that you can read the post-mortems with the benefit of knowing how every story ended.

It's a useful exercise to sit with that distance. Because the lesson the cycle is supposed to have left behind is not actually a lesson about which lender was worst, or which executive made which mistake. The lesson is structural, and it's about custody.

Every CeFi Bitcoin lender that failed in 2022 failed the same way. The pattern was: the lender took the customer's Bitcoin, pooled it with everyone else's Bitcoin, redeployed the pool to credit counterparties to generate the yield they'd promised the customer, and held the customer's claim as a contractual obligation against the lender — not as a segregated, recoverable asset.

That structure has a name, even if the marketing language never used it. It's a credit fund. The customer was a creditor of the fund. When the fund's credit book went bad, the customer was a junior creditor of an insolvent company. The Bitcoin they originally sent in was no longer theirs in any cryptographically enforceable sense. It was an entry in a bankruptcy estate.

You can vary the lender. You can vary the management. You can vary the marketing. As long as the custody structure is "we pool it, we redeploy it, you have a contractual claim" — the failure mode is what it was in 2022.

The alternative isn't to give up on Bitcoin liquidity entirely.

The alternative is to use a structure where the custody isn't contractual at all. Where the customer's Bitcoin sits in a smart contract — not on a company's balance sheet. Where the rules governing repayment, liquidation, and collateral return are enforced by code, not by a credit team. Where there is no spread to a credit book underneath the loan, so there's no incentive to redeploy customer collateral into anything.

That structure exists now. It didn't, really, in 2021. By 2026 it does, and it has been operating through multiple Bitcoin price cycles without producing the bankruptcy proceedings that defined the previous lending category.

Money Protocol is one of the production implementations. The model is straightforward: a holder opens a vault — a self-custodial position controlled by the holder's own keys. The holder deposits Bitcoin as collateral. The smart contract lets the holder mint a stablecoin (BPD) against the collateral at a one-time fee, with no ongoing interest charged on the outstanding balance. The collateral never leaves the vault. There is no operator with the authority to move it.

When the holder repays, the smart contract releases the Bitcoin. There is no waiting on a company. There is no question of solvency. There is no scenario in which the holder's collateral gets pulled into a bankruptcy estate, because there is no balance sheet that holds it in the first place.

This is not a marketing claim. It's a structural property of how the system is built. The properties that made CeFi lending fail — pooled custody, contractual claims, yield-driven redeployment — are absent by design.

What's present instead is the original Bitcoin idea, finally extended to credit. You hold your own coins. You control them with your own keys. You can use them productively without handing them to anyone. The "anyone" — the lender, the desk, the trusted third party — is replaced by code that does what it says it does, in public, the same way for everyone.

For Bitcoin holders who lived through 2022 and want to access dollar liquidity against their position without rebuilding the failure mode that took down the last category: the structural alternative is shipping. Bitcoin Liquidity — Borrow BTC at 0% Interest.

Three things every Bitcoin holder should know about self-custodial 0%-interest borrowing — and why this is the most underrated shift in crypto right now.

#1 — The CeFi era is over and the BitcoinFi era has started

Here's a quick history of Bitcoin lending in three sentences.

2018-2021: A wave of CeFi platforms (Celsius, BlockFi, Voyager, Genesis) offered Bitcoin holders the ability to borrow stablecoins against their BTC, or earn yield by depositing it. Adoption was massive.

2022: Almost every single one of those platforms collapsed. Customer Bitcoin was lost, frozen, or trapped in bankruptcy proceedings. The CeFi lending category was discredited approximately overnight.

2024 onward: A new category — self-custodial, on-chain, code-enforced Bitcoin lending — has been quietly maturing as the actual replacement. People are calling it BitcoinFi.

The defining feature of BitcoinFi is that no human is trusted. The borrower's Bitcoin is locked in a smart contract whose rules are public and auditable. The protocol team can't seize the collateral, can't pause withdrawals, can't redeploy the BTC into something risky. The position lives or dies by code.

If you got burned in 2022 — or if you watched friends get burned and are still wary of the whole category — this is the replacement that addresses the actual structural problem with the old one.

#2 — "0% interest" is real in BitcoinFi for a reason that doesn't apply to CeFi

Most people hear "0% interest" and reach for their skepticism reflex. Fair instinct, wrong category.

Here's why it works.

A CeFi lender takes your Bitcoin, lends it out somewhere, and pays you a portion of what they earn. They have to charge interest because they have to make money on the spread. That spread is also the reason every CeFi lender that promised yield in 2021 had to take aggressive risks with the underlying collateral — they were locked into a business model that required perpetual yield.

A BitcoinFi protocol works completely differently. There's no lender. You lock Bitcoin into a smart contract. The contract mints a stablecoin against your collateral. The stablecoin is yours to use. When you want your Bitcoin back, you return the stablecoin and the contract unlocks the BTC.

Nobody is "lending" the stablecoin. It's minted on demand against the collateral you posted. There's no spread for the protocol to extract because there's no third party in the chain.

The protocol covers its costs through:

A small one-time fee at borrow.

A redemption mechanism that keeps the stablecoin pegged.

Liquidations that close undercollateralized positions before they damage the system.

That's it. There's no business model that requires a recurring interest rate. So 0% is not a teaser — it's a consequence of the architecture.

#3 — What this changes in practice

Let me describe the shift the way a long-term Bitcoin holder would experience it.

Before BitcoinFi: You hold BTC. You need cash. Your options are (a) sell and trigger a tax event, permanently shrinking the position you built, or (b) give your Bitcoin to a CeFi lender and hope they're still solvent in twelve months. Both options break a rule of self-custody. There's no third option.

After BitcoinFi: You hold BTC. You need cash. You deposit your BTC into a smart contract. You mint stablecoins against it at a comfortable collateralization ratio. You use the stablecoins for whatever you needed cash for. When you have the funds, you repay the stablecoin and your Bitcoin unlocks. You never sold. You never lost custody. You never gave anyone the ability to seize your collateral.

The difference is the difference between renting dollar liquidity from your Bitcoin and transferring ownership of your Bitcoin to get dollar liquidity. CeFi forced the second. BitcoinFi allows the first.

This is structurally what a long-term holder has wanted from Bitcoin's product layer for ten years. It just took until now for the on-chain primitives to be mature enough to deliver it.

Quick FAQ

What if the protocol gets hacked? Smart-contract risk is real. Mitigation: use protocols that have multiple independent audits, an active bug bounty, and meaningful production history. Read the audit reports. They're public.

What if Bitcoin crashes? Liquidation risk is real. Mitigation: don't borrow at the maximum allowed ratio. Leave headroom — borrow at 25-40% loan-to-value rather than the absolute maximum, and you can survive a major drawdown without being closed out.

Is this taxable? In most jurisdictions, taking a loan against an asset is not a taxable event the way selling is. Talk to your accountant about your specific situation.

What can I do with the minted stablecoin? Whatever you do with any other stablecoin. Bridge it. Spend it. Convert it to USD on a centralized exchange. It's just a stablecoin.

How is this different from MakerDAO / Sky? MakerDAO pioneered single-collateral on-chain borrowing on Ethereum (its borrowing positions are called Vaults), but it accepts a basket of collateral types and never natively supported Bitcoin. BitcoinFi protocols like Money Protocol take the same self-custodial design philosophy and build it specifically for Bitcoin holders on Bitcoin-aligned infrastructure.

Where to look next

If this is the first time you're seeing the BitcoinFi category, the place to start is reading the documentation of one of the protocols that's actually shipped a working product. Money Protocol is a good entry point — its design implements the core BitcoinFi thesis (0% interest, self-custody, permissionless access, rule-based liquidation, composable stablecoin output) and the protocol docs explain the mechanics in detail.

The bigger picture is simpler than the mechanics make it sound: holding Bitcoin and using Bitcoin shouldn't be mutually exclusive. For a decade they were. They aren't anymore.

That's the shift.