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Comment by EL_Loco | Hacker News Reader

Around eight years ago, there was a power failure in my town (a small town in a third world country). The freezer that stored the local health facility's vaccines stopped working for two days because the backup generator was broken. After some investigation, it was found that when power was restored, the health officials altered the temperatures on the database to show that everything was fine and the vaccines kept their temperature in proper range for those two days. If it had been logged to a DLT with an immutable ledger, this wouldn't have happened. That's the reason I'm particularly interested in this use case (something that was done in the UK recently), because kids ended up taking these expired vaccines.

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If it had been logged in any sort of correctly designed system it wouldn’t have happened; no blockchain required.

I agree, but what I'm asking is if it isn't easier and cheaper to have a robust logging system with a public DLT. I'll give you a real example of how bad some of the database systems are in my country: a study on police gun and ammunition control found that many police stations keep track of ammunition by logging the numbers on a.... ready... a chalkboard. So I don't trust the cops who sell bullets to drug gangs if tomorrow they tell me they are not doing it anymore because they are using a computerized database to keep track of their equipment.

We don't need a blockchain to solve this problem. It would be enough to make the database public and allow third parties to make backups and subscribe/log all updates.

Agree with you, there are many systems like this. What I'd like to know is if a system using public and decentralized distributed ledger wouldn't be cheaper and/or easier to implement effectively (on a poor, corrupt country). Because you're adding more steps, like having third parties. How many? What if said third-party decide to quit checking after one year. Which database supplier do I trust to make the database public and final? To me, it seems more complicated and less transparent.

It’s not a technology limitation, it’s a “get people to agree to do it in a transparent way” limitation which crypto doesn’t address.

> there was a power failure in my town

> If it had been logged to a DLT with an immutable ledger

.. while the power was off?

The vaccination rate is about a million an hour: https://ourworldindata.org/covid-vaccinations (!!), no blockchain is going to keep up with that.

Yes, the first temperature times were typed onto a laptop, while it was still running. They were the correct temperature (unsuitable for the vaccines). I think they did temperature logs twice a day, don't remember well. Then it was found that afterwards they altered those first times and added the ones that were missing.

That sounds like a database access problem.

Sure, the temperature should just be logged automatically to the database, and the value shouldn't be allowed to change. However, it isn't. And I can see clearly how a database supplied by some vendor would yield to pressure from a government to 'tweak' some value, just this once, so that they'd be sure to get a nod on the next contract. I would trust a public ledger on its immutability more than a government run database. Or a maintainer of a database that relies on government money to exist.

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