Can bitcoin go to zero? Nobody can promise you it cannot

The two answers you usually get are "of course it can, it's backed by nothing" and "it can't, there's a fixed supply". Both are stated with more certainty than either deserves. Here is the version with the mechanism shown.

Where the price actually comes from

Bitcoin has no earnings, no dividend, no rent, no issuer with a balance sheet. There is nothing to discount and nothing to seize. Its price is what someone will pay, and the reasons people pay fall into a small number of buckets:

• Scarcity that is verifiable. The supply schedule is fixed in the software and anyone can check it. New issuance halves roughly every four years.
• Settlement that does not need permission. Transfers happen without a bank approving them, which matters more in some places than others.
• Portability. A holding can be carried across a border as a memorised phrase. For most people this is abstract; for some it has been the entire point.
• The belief that others will want it later. The largest bucket, and the one that could evaporate.

That last item is not a slur. Gold has run on a version of it for millennia. But it does mean the honest description of bitcoin's value is a shared belief with useful properties attached, not a claim on anything. Beliefs can change.

What "fixed supply" does and does not guarantee

The 21 million cap is real and it is enforced by the software every participant runs. It guarantees that no one can print more.

It does not guarantee that anyone wants any. Scarcity without demand produces a scarce thing worth nothing — there are plenty of rare objects with no market. "Only 21 million will ever exist" answers the question of dilution and says nothing about the question of demand, and those two get conflated constantly in enthusiastic arguments.

Four routes to zero, ranked by how plausible they look

Notice that none of these are "it crashes 80%". Bitcoin has fallen more than 70% from a peak on several occasions and recovered each time. Deep drawdowns are a normal feature of its history, not evidence of the end — and equally, past recoveries are not a promise of the next one. Both statements are true simultaneously, which is uncomfortable and correct.

What the history actually shows, without the spin

Both camps quote the record and both leave half of it out.

The record includes several falls of more than seventy per cent from a peak, each accompanied at the time by confident explanations that this one was terminal. It also includes recoveries from every one of those falls so far, and a network that has continued producing blocks throughout — including through exchange collapses, national bans, and the failure of businesses that were at one point synonymous with the industry.

Two conclusions people draw from that, and only one of them is supported.

Supported: deep drawdowns are a normal feature of this asset rather than a signal of collapse, and the network's continued operation is genuinely independent of the fate of any company built on it. An exchange failing is not the protocol failing, and conflating the two has produced a lot of bad predictions.

Not supported: that because it recovered before, it will recover again. Survivorship is not a mechanism. Every asset that eventually went to nothing had a record of recovering right up until the point it did not, and "it has always come back" is a description of the past tense doing work it cannot do.

The honest reading is that the record tells you what normal turbulence looks like here — which is useful for sizing a position — and tells you nothing about the terminal question.

What would actually be worth watching

If you wanted early evidence rather than reassurance, price is the least informative thing to look at. These are more diagnostic:

• Whether the fiat on-ramps still work. The realistic path to prohibition runs through banking, not through police. If regulated firms in major economies could no longer convert between currency and crypto, that would matter far more than any single announcement.
• Whether developers are still working on it. A protocol that stops being maintained cannot adapt — including to the cryptography question, which has a migration path only if someone is building it.
• Whether the network stays expensive to attack. Security is paid for by miners, and miners are paid by issuance and fees. A sustained collapse in that budget would be the mechanism by which a price fall became permanent rather than cyclical.
• Whether people use it for anything other than trading it. The strongest bear argument is not that it will be banned but that demand drifts away. Non-speculative usage is the counterweight to that, and it is measurable.

None of these is a signal to act on tomorrow. They are the things that would move slowly and mean something, as opposed to the things that move quickly and mean very little.

Why "it can't go to zero" should make you suspicious

The phrase is worth flagging on its own, because of who says it and when.

It appears most often at the moment someone is being asked to put in more than they are comfortable with. It is reassurance offered in place of an argument, and it has a specific structural problem: it converts a risky asset into a safe one rhetorically, which is exactly the move that makes people size a position wrongly.

Anyone who genuinely believes there is a floor should be able to say where the floor is and who is holding it up. There is no issuer, no central bank, no insurance scheme, and no buyer of last resort. The absence of those is a design decision that people advocate as a feature. It cannot also be a guarantee.

This is the same instinct as the wider question of why so many people call the whole thing a scam — some of those criticisms land, and pretending they do not is how you end up believing your own marketing.

What to do with an answer like this

An honest "we cannot rule it out" is only useful if it changes something. It should change exactly one thing: the amount.

The practical version is to size any position such that a total loss would be annoying rather than damaging. That is not a formula and it is deliberately not a percentage — the right number depends on your debts, your income stability and your emergency savings, which we do not know. The page on how much to risk is a set of questions to ask yourself rather than a recommendation, because a recommendation from strangers on the internet is worth roughly what you paid for it.

What this answer should not change: it is not a reason to buy more because "the downside is priced in", and it is not a reason to sell everything because "it might go to zero". Both of those are the same mistake — treating an unquantifiable risk as though it were quantified.