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> For example, what happens when a piece of bread is worth less than 1 satoshi

That does not seem to be an imminent danger. The price of Bitcoin would have to increase literally 1.4 million times for a satoshi to be worth a penny.

> To make matters worse, if a whole bunch of flames goes up in flames more can be printed to replace it. If Bitcoin goes missing[1], it's gone for good.

Isn't that the same with paper cash? If by a "whole bunch" you mean enough to cause a worldwide issue, then there are solutions to that. Maybe not great solutions, but there are some. Worst case, a hard fork. That's essentially what led to Ethereum vs Ethereum Classic, isn't it?

If you mail a torn banknote to the Treasury they will send you a brand new one. There is no recourse if a hard drive or electronic wallet containing a bunch of Bitcoin is destroyed, for example.

You can say "tough luck", sure, but the end result is that the amount of money circulating in the economy will be decreasing every day.

And how does a fork solve anything? You can't just say, hey throw away all your existing Bitcoin, we're starting from scratch and using this new one now.

> If you mail a torn banknote to the Treasury they will send you a brand new one.

Torn, yes. Lost/destroyed, no. I don't think the torn analogy represents the scenario being discussed.

> And how does a fork solve anything? You can't just say, hey throw away all your existing Bitcoin, we're starting from scratch and using this new one now.

That's exactly what Ethereum did. The old one was essentially "thrown away" and became known as Ethereum Classic. A small group of people stuck with the old one, but it's not the main one we think of when we say "Ethereum" these days.

> Torn, yes. Lost/destroyed, no

They still will, if there is a way to verify it (e.g. stuff in a bank vault).

The UK mint will replace burnt money if you send them the ashes.

>A deeper problem is what happens when the economy grows to more than what Bitcoin can represent. For example, what happens when a piece of bread is worth less than 1 satoshi? With a fiat currency, you can simply print more so that said piece of bread can have its value accurately represented. You can't do that with Bitcoin.

1) Printing more money only "solves" that problem by debasing everyone's cash holdings. It's not an unalloyed good.

2) The protocol can change, by soft fork, to allow for greater precision.

3) You can create all kinds of derivatives or accounting fictions that subdivide an indivisible asset, exactly as is already done with:

a) fiat currencies -- where you log sub-cent transfers and then periodically settle,

b) ETFs, where a share represents a (bundle of) sliver(s) of a stock share, but they trade at par because you have the right to redeem large blocks of them for the corresponding asset. (The same mechanism can work for sub-cent instruments.)

> With a fiat currency, you can simply print more so that said piece of bread can have its value accurately represented

But, realistically, has this ever happened in the era of fiat currency? Certainly the opposite case has happened. Adding another decimal place to a fiat currency would be a complete disaster -- every single moving piece in the financial system would need to be "fixed", including fixed-length protocols that date to the COBOL era. This solution is entirely unrealistic.

On the other hand, it is at least conceivable that a hard fork to increase the precision of Bitcoin would be uncontroversial (in that the old fork would not survive). There would be ripple effects throughout the (hypothetical future Bitcoin-based) banking system, but no worse, I would think, than would happen for fiat currency.

> Cryptocurrency is not a currency because it specifically aims to reintroduce problems that currency solves

You say "problems" here, but you only indicate one problem. The other problem (the destructibility and replaceability of money) is not really a problem that currency solves in the context you're using it, since for most of history specie was precious metals, and if lost at sea was gone (I mean, theoretically recoverable, but it's probably cheaper to find new gold in the ground).

And for a private individual, the "replacement" will simply never happen -- if I burn a big pile of bills in my back yard, that money will never be replaced, and it's a bit absurd to claim that it would be.

> But, realistically, has this ever happened in the era of fiat currency?

Well, no, because fiat currencies don't tend to experience either sustained or rapid deflation, so the problem never arises.

Of course, consistently avoiding the problem is even better than solving it.

> This makes Bitcoin appealing to many people because something that will never increase in supply is more likely to hold its value.

Unless you take twenty minutes to create a fork of it.

Now you have two problems :-D

> what happens when a piece of bread is worth less than 1 satoshi?

If Bitcoin ever becomes that valuable, the plan is to modify the protocol to use more decimal places.

do you have a link/source for this? just curious, thanks

Again, Bitcoin is "infinitely" divisible, the current 8 decimal cap can be easily modified if needed. There's no limit to the smallest unit as with standard currencies.

That is, up to the limits of IEEE 754 - unless a BCD is used.

Cryptocurrencies are most certainly divisible. You don't have to trade whole "coins".

The biggest problem I see is the fact that it is a deflationary currency. Which makes it a pretty great store of value, but it also means that it is almost guaranteed to be worth more tomorrow than it is today. So instead of spending money or investing it for other people to use so it will grow, people will be incentivized to hold onto it.

Edit - I was not aware that a "satoshi" is the term for the smallest denomination of Bitcoin. I was under the impression it was a generic kind of cute name for cryptocurrencies.

> Cryptocurrencies are most certainly divisible

The parent asked "what happens when a piece of bread is worth less than 1 satoshi?" - as far as I know, one satoshi is not divisible; am I mistaken?

Santiago originally said if we need more than 8 decimal places, it can be done with an update. There’s nothing really fundamental in Bitcoin that is limiting it to 8 decimal places.

You should probably clarify that 1 satoshi = 0.00000001 bitcoins, the current smallest unit. Now people say "we can move the decimal point", but I believe they are stored as 64 bit integers. Which means the smallest unit is not infinitely divisible without moving to say 128 bit integers (which is not much _more_ of a hurdle, but still slightly higher effort than implied by adding more precision).