The colony has a rhythm, and the rhythm exists because I keep it. Food at seven, every day, for years. The cats turn up because the food turns up, and the whole arrangement — the territory, the tolerances, the schedule nobody wrote down — rests on a supply I provide.

Take me away and it doesn't collapse immediately. They're cats; they'd find other gardens, other bins, other people. But the specific shape of the thing, the reliability of it, exists because something funds it.

Bitcoin's security has a funder too, and in about a century it stops paying. This is the one genuinely unresolved question in the whole system, and it is far more interesting than anything about the price.

1. Where the Money Comes From Now

Miners are paid two ways:

• The block subsidy — newly issued bitcoin, currently 3.125 per block, halving roughly every four years until it reaches zero.
• Transaction fees — what users pay for block space.

Today the subsidy is still the overwhelming majority of miner revenue on an ordinary day. Fees matter, spike during congestion, and are mostly a side dish.

That ratio is scheduled to invert. Not "might" — the subsidy is on a fixed path to zero, written into the rules every node enforces. By the 2030s it's a fraction of what it is now. Eventually it's nothing, and fees are the entire security budget.

2. Why This Matters At All

The chain's resistance to being rewritten is bought. Attacking bitcoin means out-mining the honest network, and the cost of doing that scales with how much honest mining is happening — which scales with how much miners are paid.

So the security of your savings is, in a real and literal sense, a function of miner revenue.

If that revenue falls a long way without something replacing it, the cost of attacking the chain falls with it. Not to zero, not overnight, but the direction is the point.

3. The Optimistic Case

Several things could resolve this, and they're not silly:

• Fees rise with demand for settlement. If bitcoin becomes a high-value settlement layer — with Lightning, and whatever follows it, handling everyday payments — then each block carries transactions worth far more than a coffee, and people pay accordingly. Block space becomes genuinely scarce and genuinely valuable.
• Price does the work. A fee paid in sats is worth more if sats are worth more. The security budget is denominated in bitcoin but spent in energy, so appreciation substitutes for volume.
• The transition is gradual. This isn't a cliff. Each halving is a step down, over decades, with time to adapt — and so far hash rate has grown through every one of them.
• Efficiency improves. Cheaper energy and better machines mean a given budget buys more security than it used to.

4. The Pessimistic Case

And the arguments on the other side, which deserve the same seriousness:

• Fees have been volatile and mostly low. Outside congestion spikes, the fee market has not shown it can carry the load. Promising that it will is a forecast, not an observation.
• Layers reduce base-layer demand. The thing that makes bitcoin usable — moving traffic off-chain — also removes the fee pressure that is supposed to fund security. There's a real tension between scaling and paying for the guard, and it doesn't resolve itself.
• A smaller budget concentrates mining. If margins thin, the operators who survive are the largest and cheapest-powered. Concentration is itself a security property, and not a good one.
• Instability near the floor. There's serious academic work suggesting that when fees dominate and vary a lot block to block, miners get incentives to behave badly — to compete over fat blocks rather than extend the chain. That's a subtler failure than a 51% attack and harder to reason about.

Nobody has demonstrated the fee-only equilibrium. It has never existed.

5. What Honest Uncertainty Looks Like

This is the part I want to land.

The supply cap is arithmetic — verifiable, settled, not a matter of opinion. The security budget is not. It's an open design question with a hundred-year horizon and no empirical answer yet.

Anyone who tells you it's definitely fine is doing faith. Anyone who tells you it's a fatal flaw is doing drama. The accurate position is that it is the system's most interesting unsolved problem, that there's time, and that the people working on it know it.

I'd rather hold an asset whose hardest question I can name than one whose hardest question I've been told not to ask.

6. What It Means for You

Practically, almost nothing this decade. But two things worth carrying:

• Watch fee revenue as a trend, not as a spike. It's the metric that tells you whether the transition is on track, and it's the one I'd put at the top of the adoption dashboard I described a few articles back.
• Notice who refuses to discuss it. How a commentator handles this question is an excellent test of whether they're explaining or selling. It costs nothing to say "this part is unresolved", and the people who can't say it are telling you something.

The Point

The bowl is full at seven because somebody fills it. That arrangement has held for years and it will hold for more, and it is still worth knowing that it rests on a supply rather than on a law of nature.

Bitcoin's guard is paid, today, mostly out of a subsidy that is on a schedule to end. Something has to take its place. It probably will. Nobody has proved it, and the honest thing is to say so out loud while there's still a century to work it out.

The cap is arithmetic. The security budget is a question. Don't let anyone sell you the second as if it were the first. 🐾⚡