How quickly can bitcoin theoretically provide transaction confirmation times?

DannyHamilton

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Quote from: mczarnek on May 12, 2014, 05:05:20 PM

Quote from: jonald_fyookball on May 12, 2014, 02:15:31 PM

Retail point of sale can happen with just transaction, 0 confirmations, which takes only seconds.

If people don't wait for confirmations then what prevents me from creating a double spend app that let's you double spend your Bitcoin?

The same thing that prevents every other form of fraud and theft.

The morality and ethics of the majority of your customers, and the theft and fraud laws that allow you to catch and prosecute those without morality and ethics.

jonald_fyookball

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Core dev leaves me neg feedback #abuse #political

You could build such an app. It would work some of the time. You could also
simply walk out of the restaurant without paying.

This topic has been discussed in many threads. Here's one
https://bitcointalksearch.org/topic/is-a-0-confirmation-double-spend-for-retail-possible-159994

mczarnek

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Quote from: jonald_fyookball on May 12, 2014, 02:15:31 PM

Retail point of sale can happen with just transaction, 0 confirmations, which takes only seconds.

If people don't wait for confirmations then what prevents me from creating a double spend app that let's you double spend your Bitcoin?

jonald_fyookball

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Core dev leaves me neg feedback #abuse #political

Quote from: mczarnek on May 12, 2014, 12:04:05 PM

I'm talking for check out counter transactions, and the network needs to agree it's correct.

Because 10 minute block size and 6 blocks needed for a confirmation seems like it can't be good enough.

I have heard the poll the miners approach.. how quickly can that be done?

Retail point of sale can happen with just transaction, 0 confirmations, which takes only seconds.

mriou

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There's no absolute, it's just degrees of risk, going from 0-confirmation to 100 blocks of confirmation or more. I'm not aware of any theory or paper trying to quantify those risks precisely though, it's actually pretty difficult. I'd be interested if someone knows of a good publication here. If someone gets a good risk profile, I can imagine an insurance business could get structured around it.

mczarnek

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I'm talking for check out counter transactions, and the network needs to agree it's correct.

Because 10 minute block size and 6 blocks needed for a confirmation seems like it can't be good enough.

I have heard the poll the miners approach.. how quickly can that be done?

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