A plumb line is a string with a weight on the end. That is the whole technology. You hold it against a wall and the wall either agrees with it or it does not. The line has no opinion about the mason. It has no stake in the building. It hangs because the earth pulls, and it will hang the same way tomorrow, and the day after, and in a hundred years, in a country that no longer exists. Amos saw one in the hand of God. I keep thinking about that.
I. The Man Standing on the Wall
The vision is four verses long and nothing happens in it.
The Lord stands on a wall made by a plumb line, with a plumb line in his hand. He asks the prophet what he sees. Amos says: a plumb line. That is the answer. That is the whole answer.
No fire. No flood. No army on the horizon. A string, a weight, and a wall that was built straight once and has been leaning ever since.
Judgment in Amos is not a storm. It is a measurement. The wall is not condemned for being ugly. It is condemned for being out of true, and the thing that condemns it cannot be argued with, because it is only gravity with a rock tied to the end of it.
I have never found a better picture of what money is supposed to be.
II. Money Has Three Jobs and Fails at Only One
Money is a medium of exchange, a store of value, and a unit of account.
The first two get all the argument. The third is where the room goes quiet.
A unit of account is the ruler. It is the thing everything else is measured against. Rent is not rent until it is priced. A wage is not a wage until it is counted. Every contract you have ever signed was written in a unit, and you have almost certainly never thought about the unit, the same way you have never thought about the inch.
Here is the trouble. The inch does not get shorter when a committee meets.
Fiat’s third job is the one it performs worst and confesses least. The number in your account is the ruler, and the ruler is edited. Not dramatically. Not all at once. A few percent a year, which is precisely the rate at which nobody notices and everybody is poorer.
You cannot measure debasement using the thing being debased. That is the entire problem in one sentence, and no central bank has ever answered it, because answering it would require standing still.
III. The Word “Bit” Was Already a Cut Coin
Bitcoin has a measuring problem of its own, and it is the better kind.
The ledger counts in whole numbers, and the whole numbers are very small. When the price climbed, the display turned absurd. A ten dollar coffee became a smear of zeros with a few digits hiding at the end, and people started fat-fingering decimal places in both directions.
In December of 2017 Jimmy Song wrote the complaint down as a formal proposal. BIP 176 asked the ecosystem to standardise on “bits”, where one bit is one hundred satoshis, one millionth of a bitcoin. His worked example is still the clearest statement of the problem anyone has managed: at fifteen thousand dollars a coin, ten dollars and five cents is “a somewhat confusing 0.00067 BTC, versus 670 bits, which is a lot clearer.”
Here is the part almost nobody quotes. In the backwards compatibility section, Song lists the older meanings of the word “bit” that might confuse newcomers, and the first one on his list is this: a bit used to mean one eighth of a dollar. Two bits, a quarter. That is where the phrase comes from. The Spanish silver dollar was physically cut into eight wedges, and a wedge was a bit.
So the word we reached for, to name the smallest useful piece of the hardest money ever built, was already the name of a coin somebody had taken a chisel to.
The proposal’s status reads Complete. Almost nobody uses it.
IV. The Argument About Where the Decimal Point Goes
The argument did not end there, and it got stranger.
There is a draft proposal assigned in April 2025, BIP 177, written by John Carvalho, which proposes that “one bitcoin” should simply mean one base unit. The thing you currently call one bitcoin would become one hundred million bitcoins. The words “satoshi” and “sat” are deprecated. The ticker BTC is left exactly where it stands.
The motivation paragraph is worth reading twice. The decimal point, it says, is merely a human-imposed abstraction. The chain never had one. There are only integers, roughly 2.1 quadrillion of them, and a display convention we invented so the numbers would look like dollars.
Notice what is and is not under dispute. Neither proposal touches the supply. Neither touches consensus. Nobody in this argument is asking to mint anything, and nobody could, because the schedule is a boundary stone you may not move. Two grown men wrote formal documents about where to put a decimal point, and the thing they were notating sat there unbothered, counting.
Men argue about the notation. Nobody argues with the line.
V. What the Cuts Are Actually For
Every four years or so the issuance is cut in half, and the cut arrives on schedule because it is not a decision.
The cuts landed in 2012, then 2016, then 2020, then 2024. The next one comes at block 1,050,000, some time in 2028. Every one of those is a rehearsal. They are not the thing itself. They are the wall being checked, over and over, by a line that will not move.
What the cuts are building toward is a currency whose supply growth reaches zero and stays there. That is not a price prediction. That is an arithmetic property, and it is the property that makes a measure a measure. A ruler that stops changing length is worth more than a ruler that is currently the right length.
I think this is why the doctrine is stated the way it is: to be saved, you must hold. Not because holding makes anyone rich, and not because I have any idea what the price does next. This is theology, not a prospectus, and I am not qualified to tell you what to own. It is because the measure only means anything to the person standing inside it. You cannot be measured by a ruler you refuse to stand next to. Custody is how you stand next to it.
The last cut, the one after all the rehearsals, is the Halfture, and the Halfture is the Rapture. It is more than a century out. Neither of us will see it. That is fine. Nobody who set a boundary stone expected to be standing there when it mattered.
VI. Nobody Prices Bread in Sats Yet
Let me be honest about where we actually are.
Almost nothing is priced in bitcoin. Merchants who accept it quote in dollars and convert at the till. Your salary is fiat. Your mortgage is fiat. Even the people who talk loudest about a bitcoin standard check the price in dollars every morning, which is the tell: the ruler they are using to measure bitcoin is the currency they say bitcoin replaces.
A measure needs stillness, and bitcoin is not still. It is a plumb line in a high wind. The line is straight, and it is swinging, and you cannot yet hold it against a wall and read anything off it.
But the wind is weather and the line is physics. Every cut takes a little more of the motion out of the supply side, which is the only side the protocol controls. The schedule walks its subsidy down to a single satoshi and then to nothing at all, and what is left at the end is a quantity that does not respond to anything. Not to policy. Not to panic. Not to me.
The Counter-Sermon
Here is the strongest case against everything above, and I want to give it properly.
A plumb line is useless in a building nobody lives in. A unit of account is not a mathematical property, it is a social fact, and social facts are won by adoption, not by arithmetic. The dollar is a bad ruler that a few billion people have agreed to use, and a good ruler nobody uses is not a ruler at all. It is a paperweight with a string.
There is worse. The two proposals in this essay are evidence against the sermon’s own thesis. If the measure were genuinely fixed and self-evident, there would be no eight-year argument about how to write it down, and no serious person proposing to multiply every displayed number by a hundred million to make it legible. That argument is not decoration. It means the thing is hard to hold in your head, and hard to hold in your head is how rulers lose.
And the deepest objection is the plainest. Gold sat still for five thousand years and did not save anybody from the twentieth century. A fixed quantity is not a moral outcome. Scarcity is a fact about a ledger, not a promise about a life, and it is entirely possible that we have built a perfect instrument for measuring a world that will go on ignoring it. Maybe none of this saves anyone. Maybe the wall just leans, and the line just hangs, and the two never meet.
I hold the line anyway. But I want you to know I have heard the other thing.
What to Do With a String and a Rock
There is no action item at the end of Amos. The prophet does not build the wall again. He is just a man who was shown a measurement and asked to say what he saw.
That is most of what I am doing here. I am not telling you the wall is coming down. I am telling you there is a line, it has been hanging since 2009, it does not care about your portfolio or mine, and it will still be hanging when everyone currently shouting about the price has stopped shouting.
You can check it yourself. That is the strangest part. Any node, any laptop, any evening. The arithmetic is public and the ruler is free.
Buy Bitcoin, Prepare for Halfture.
FAQ
What is the Bitcoin Halving Plumb Line?
It is a way of describing what the Bitcoin Halving does to the supply schedule. A plumb line measures without negotiating, and the halving enforces issuance without any authority deciding to enforce it. The comparison comes from the prophet Amos and the wall he was shown.
Does the Bitcoin Halving change how bitcoin is denominated?
No. The halving changes the block subsidy, not the units. Denomination is a display convention, and it has been debated separately in BIP 176, which proposed “bits” as a standard term for 100 satoshis, and BIP 177, which proposes calling the base unit itself one bitcoin. Neither proposal alters consensus rules or the supply cap.
Is bitcoin a unit of account today?
Not really. Bitcoin works as a medium of exchange and is widely held as a store of value, but almost no prices are quoted in bitcoin, and even holders measure it in fiat. A unit of account requires relative stability, and that is the job bitcoin has not yet done.
When is the last Bitcoin Halving?
The final cut, the Halfture, is projected for the twenty-second century, near block 6,930,000, after which the block subsidy rounds to zero and miners are paid by transaction fees alone. The cut before it arrives at block 1,050,000, expected in 2028. Every halving before the final one is a rehearsal.
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