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    Author Topic: How do these Bitcoin transactions confirm so quickly?  (Read 238 times)

    • Jet Cash (OP)
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    August 13, 2018, 06:47:19 AM
    Merited by paxmao (1)
     #1
    This video was made in October 2017, and the guy was shopping in a Tokyo supermarket, and paying with Bitcoin.
    https://www.youtube.com/watch?v=W4J_myvNYG8

    He seems to have had his transactions confirmed almost immediately, and I don't understand how this happened. I can see it working with the lightening network, but I don't think that was available then. Is it just that the shop is prepared to take a risk, and as long as the transaction was sent, they don't bother to wait for a confirmation? That seems to be a bit risky, as if it was sent as a no/low fee transaction, there must be a risk that it is never confirmed.

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    August 13, 2018, 06:49:18 PM
    Merited by suchmoon (7)
     #2
    It's obvious the answer is they accept 0-conf/zero-confirmation, but most likely they do/check these things (since there's few second delay on the video) before the system decide to verify the transaction :
    1. Check fee in the transaction is sufficient to get confirmed
    2. Check the bitcoin network if there's double-spend attempt
    3. Broadcast the transaction to many other nodes to reduce double-spend attempt chance

    But, there shouldn't be any problem with double-spend attempt if the "attack" transaction is broadcasted few seconds slower. More info https://bt.irlbtc.com/view/423.msg3819#msg3819
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