Ledgers, of course, are nothing new. What's distinctive about blockchains is that the ledgers are supposed to be decentralised :

They aren't sitting on the computers of a single bank or other company; they're in the public domain, sustained by protocols that induce many people to maintain records on many servers.

These protocols are, everyone tells me, extremely clever. I'll take their world for it.The question I've never heard or seen satisfactorily answered, however, is ''What's the point?''

Why go to the trouble and expense of maintaining a ledger in many places, and basically carrying that ledger around every time transaction takes place?

The original rationale for Bitcoin was that it would do away with the need for trust - you wouldn't have to worry about banks making off with your money, or governments inflating away its value.

In reality, however, banks rarely steal their customers' assets, while crypto institutions more easily succumb to the temptation, and extreme inflation that destroys money's value generally happens only amid political chaos.

Still, there was an alternative, more modest justification for using blockchain technology, if not necessarily for cryptocurrencies. It was supposed to offer a lower-cost, more secure way to keep track of transactions and stuff in general. But that dreams appear to be dying, too.

Amid all the sound and fury over FTX, I'm not sure how many people have noticed that the few institutions that seriously tried to make use of blockchains seem to be giving up.

Five years ago, it was supposed to be a big deal - a sign of mainstream acceptance - when Australia's stock exchange announced that it was planning to use a blockchain platform to clear and settle trades.

Two weeks ago, it quietly canceled the plan, writing off $168 million in losses.

Maersk, the shipping giant, has also announced that it is winding down its efforts to use a blockchain to manage supply chains.

A recent blog by by Tim Bray, who used to work for Amazon Web Services, tells us why Amazon chose not to implement a blockchain of its own : It couldn't get a straight answer to the question, ''What useful thing does it do?''

So how did this enterprise, which never stood up to scrutiny, become such a big deal?

It was probably a combination of factors. Political ideology played a role : Not all crypto enthusiasts were right wingers, but distrust of banks - we all know who runs them - and government-managed money provided a hard core of support.

The romance of high tech also played a role, with the very incomprehensibility of crypto discourse acting, for a while, as a selling point. And then, as prices soared, fear of missing out - plus large outlays on marketing and political influence-buying - brought many others from the bubble.

It's an amazing story, and also a tragedy. It's not just the small investors who have lost much if not all of their life sayings. The bubble crypto has had huge costs to society as a whole.   

Bitcoin mining alone uses as much energy as many countries; I've been trying to estimate the value of the resources consumed in producing fundamentally worthless tokens, and it's probably in the tens of billions of dollars, not counting the environmental damage.

Add in the costs associated with other tokens and the resources burned up in abortive efforts to apply a blockchain approach to everything, and we're probably talking about waste on an epic scale.

No doubt I'll hear from many people still insisting that I don't get it. But it really looks as if there never  was an it to get.

The World Students Society thanks author Professor Paul Krugman.


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