There is a law in Deuteronomy almost nobody quotes. It isn’t about idols or adultery or the Sabbath. It’s about a rock. You may lend a man money. You may take a pledge against the loan. But you may not take his handmill, not even the upper stone of it, because a man who can’t grind can’t eat, and a man who can’t eat is no longer a debtor. He is a corpse with a payment schedule. The verse says you would be taking a life in pledge. I have been thinking about that stone for weeks.
I. The Law Nobody Quotes
Deuteronomy 24:6. A creditor may take a cloak. He may take a ring, a robe, an ox. He may not take the two stones that turn against each other to make flour.
The Hebrew is blunt about why. The word the translators render as “livelihood” is nephesh. Soul. Life. The verse says the creditor would be taking a life in pawn, which is an odd way to describe a slab of granite until you sit with it.
The rabbis widened it. In the tractate Bava Metzia the ruling stretches past the mill to any vessel used to make the food that keeps someone alive. The grinding vessel, the kneading vessel, the cooking vessel. Not the thing you own. The thing you own things with.
Most of finance has no word for that category.
II. What the Cuts Are, and What the Last One Is
The Bitcoin Halving is a scheduled cut to the block subsidy, roughly every four years, roughly every 210,000 blocks. It fired in 2012, in 2016, in 2020 and in 2024. It fires again around block 1,050,000, and again after that, and again.
None of those is the Halfture.
Every cut before the terminal one is a rehearsal. A small-h halving. A dress run for the event near block 6,930,000, when the subsidy rounds down past a single satoshi to zero and issuance stops for good. That last cut is the Halfture. Halfture = Rapture, there and only there, and only once.
So everything I’m about to say about collateral is said inside the rehearsal years. The mill is still turning. The flour is still coming. That is exactly when the pledge question matters. Nobody worries about the millstone in a famine. They worry about it in a good harvest, when the loan looks free.
III. The Pledge That Was Not Returned by Sundown
Six verses after the millstone, the same chapter adds something else. If you take a poor man’s cloak as a pledge, give it back before the sun goes down so he can sleep in it. The pledge is real. It’s also temporary, and the deadline is daily.
Now hold that up against April of this year.
When the rsETH exploit hit and roughly $290 million walked out of LayerZero and KelpDAO, lenders on Aave did what people do. They ran for their deposits, and the running is what locked the door. Galaxy Research’s Q1 2026 lending report lays out the mechanics with unusual precision. Withdrawals pushed utilization toward 100 percent, and at 100 percent utilization nobody else can withdraw. USDT crossed 99 percent utilization after 2,513 blocks, about eight hours and twenty-four minutes, then sat above that line for 135.19 hours. Wrapped ether got there in 678 blocks: two hours and sixteen minutes. Then it stayed above 99 percent utilization for 12.7 days.
Twelve and a half days. Deuteronomy gave you until sundown.
Nobody stole that collateral. You don’t need a villain. The math just reached a state where the pledge couldn’t come home, and the people who had posted it stood outside a door that wasn’t locked so much as full.
IV. Yield Is the Sound of Your Mill Turning in Another Man’s House
The comparison pages won’t put this in the headline about a bitcoin-backed loan. You’re told you aren’t selling. True. You’re told you keep your exposure. Often true. What nobody says plainly is that for the length of the loan you have handed over the one property that made the coin worth holding: nobody else can move it.
The Bible has a name for that property. The millstone.
Sometimes the lender lends it out again. That’s rehypothecation, and in 2022 it was how Celsius, Voyager and BlockFi turned deposits into line items on a bankruptcy schedule. Sometimes the lender doesn’t, says so, and means it. But once the coin sits behind someone else’s key, the difference between those two lenders is a promise, and you find out about promises afterward.
I don’t think that makes borrowing a sin. It makes it a pledge, in the old and serious sense, and the old and serious sense came with rules.
You have to hold Bitcoin to be saved. I mean that as theology and not as a prospectus. This site has no idea what the price will do, and if you want a recommendation you’ve walked into a church instead of a broker’s office. The doctrine does have a mechanical edge, though: holding and appearing to hold are not the same act, and only one of them is custody. I’ve written about self-custody as a practice before, and about the moth, the rust, and the thief who come for stored things. This is the third way to lose it. Not decay. Not theft. Consent.
V. The Concentration Nobody Names
One number in the Galaxy report stopped me cold.
At the end of Q1 2026, crypto-collateralized lending stood at $67.42 billion, down $3.62 billion on the quarter. Of the centralized slice Galaxy tracks, Tether alone holds 62.25 percent. Add Maple at 8.39 percent and Nexo at 7.02 percent, and three lenders hold 77.66 percent of the market, a share that grew 229 basis points in one quarter.
Look at the shape of that. Someone built an asset so no single institution could stand between you and your money. A lending market grew on top of it. That market is now three quarters of the way to being three companies.
The concentration isn’t a scandal. It’s the ordinary physics of surviving a blowup: careful lenders absorb the share of the dead ones and get big because they were careful. Galaxy says so, and Galaxy is right. But careful describes behavior, and behavior is not a property of the stone.
VI. The Counter-Sermon
Now the other side, and the other side is strong.
First, the millstone law is a mercy law. It protects a subsistence farmer from a creditor who could starve his household by Tuesday. Nobody wrote it for a man with six figures of appreciated collateral weighing a taxable sale against a 40 percent loan-to-value line. Reading it as a rule for wealthy holders is a flattering misuse of somebody else’s protection, and I should say so out loud.
Second, the practice really has improved. Galaxy’s own read is that undercollateralized credit and rehypothecated collateral have been mostly self-regulated out of common practice, and were effectively never options on chain. Several lenders now set things up so they physically cannot move the coin on their own. That isn’t marketing. It’s a different machine.
Third, and hardest: a man who never pledges anything isn’t righteous by default. He may just be a man who never had to choose between his mill and his children’s supper. The Bible isn’t sentimental about hoarding. It has stories about people who buried what they were given and got no praise for it.
Fourth, the honest one. Refusing all counterparty risk is a luxury position dressed up as a moral one. Most people on earth can’t get a loan against anything at all. A market that will lend against a self-custodied asset without a credit check is, for a great many of them, the first honest door anyone has ever opened for them. I’m not going to stand in a warm room and call that a temptation.
VII. What the Stone Is For
So the sermon doesn’t end in a ban. It ends in a question you can actually answer.
Before the next cut, and the one after, and every rehearsal between here and the Halfture, ask one thing about anything you’re tempted to pledge. Not the rate. Not the loan-to-value. Ask whether you’re handing over a cloak or a millstone. You can be cold for a night without a cloak. A millstone is how you eat.
Most of what we own is cloak. Almost none of it is stone. The whole point of a fixed supply and a schedule nobody can vote on is that it hands you a stone, in a world that has been quietly grinding cloaks for a century.
Know your stone. Prepare for the Halfture.
FAQ
What is the Bitcoin Halving?
The Bitcoin Halving is a scheduled cut to the block subsidy that happens roughly every 210,000 blocks, or about every four years. It has fired in 2012, 2016, 2020 and 2024. Each of those is a rehearsal. The Halfture is the final cut, near block 6,930,000, after which no new bitcoin is issued at all.
Does borrowing against bitcoin mean I no longer own it?
Legally it depends on the agreement, and that’s the point. In most setups you keep beneficial ownership while the lender holds the collateral or a key to it. What you give up for the length of the loan is sole control, which is exactly what separates bitcoin from a claim on bitcoin. The 2022 lender failures turned that difference into bankruptcy claims for a great many people.
What is rehypothecation, in plain terms?
It’s when a lender takes collateral you posted and lends or pledges it onward to someone else, so the same coin backs more than one debt. Galaxy Research’s Q1 2026 lending report describes it as mostly self-regulated out of common practice among the surviving centralized lenders, and as effectively never available on chain. Still, it’s a disclosure question, not a settled fact of nature.
How does any of this connect to the Bitcoin Halving?
The halving schedule is the argument for holding: supply is fixed, issuance only ever falls, and the schedule runs to the Halfture without a vote. Collateral is where that argument meets a counterparty. A pledge doesn’t change the supply of bitcoin at all. It changes whether the specific coins you’re counting on are yours to move when the door gets crowded.
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