Bitcoin vending machine - page 2. | Bitcointalksearch.org

westkybitcoins

legendary

Activity: 980

Merit: 1004

Firstbits: Compromised. Thanks, Android!

Quote from: Fiyasko on January 13, 2012, 02:05:46 PM

I just see thse machines as "HACK ME NOW, PLEASE TRY TO HACK ME" subjects for people, Lol. Imagine these machines inside highschools, Sooooo many kids would be trying to mess with it

Well, considering the machine never has to store private keys, even high-schoolers shouldn't be able to do too much damage with it.

(Famous last words.)

Mousepotato

hero member

Activity: 896

Merit: 1000

Seal Cub Clubbing Club

Quote from: farfiman on January 13, 2012, 03:01:25 PM

For the price of a coke ( or a few) they can take the risk. If they have 1000 machines that take bitcoin how many transactions will be not confirmed?

Exactly, plus they can build a certain amount of insurance into the price of each Coke so that over the long haul, they're still making profits even when transactions don't confirm.

DeathAndTaxes

donator

Activity: 1218

Merit: 1079

Gerald Davis

Quote from: Fiyasko on January 13, 2012, 02:05:46 PM

If anyone thinks they can make this system go faster, Then your either Not thinking it though, Or your smart as hell.

Im shocked at how fast they got it to go, What about people sending coins and then Not waiting for confirmations? Surely nobody wants an vending machine that has to sync to the blockchain, Wait 10mins for 1confirm just to get thier item, Im wondering how the HELL they managed to get it to go so fast, The only thing that i can think of is them skipping the Confirmation stages... But then that allows me to walk up, Dump 100coins in, Shut my phone internet off so that i dont resync and Bam, I have free credit in the machine untill i resync my phone with the blockchain.

Perhaps they do it with Prefunded accounts? Such as BitPay or e-wallet style services That way there Isnt a block chain, Just account to account....
...
I just see thse machines as "HACK ME NOW, PLEASE TRY TO HACK ME" subjects for people, Lol. Imagine these machines inside highschools, Sooooo many kids would be trying to mess with it

In related news you can steal cokes from a vending machine w/ counterfeit USD (or stolen credit cards) too.

Trying to time a double spend in meatspace where there may be video of you for something as trivial as a free coke seems about the stupidest criminal act one can make.

Also not sure how you get the idea that turning phone off would get you free product. The machine doesn't trust your phone it trusts the blockchain. Non-confirmed transactions CAN be double spent but not the way you describe and it is a non-trivial task to pull off. For low value real world transactions the risk is very low probably lower than losses due to stolen credit cards in CC enabled machines.

Hawkix

hero member

Activity: 531

Merit: 505

Quote from: Fiyasko on January 13, 2012, 02:05:46 PM

Im shocked at how fast they got it to go, What about people sending coins and then Not waiting for confirmations? Surely nobody wants an vending machine that has to sync to the blockchain, Wait 10mins for 1confirm just to get thier item, Im wondering how the HELL they managed to get it to go so fast, The only thing that i can think of is them skipping the Confirmation stages... But then that allows me to walk up, Dump 100coins in, Shut my phone internet off so that i dont resync and Bam, I have free credit in the machine untill i resync my phone with the blockchain.

Its not that easy to double spend. It has nothing to do with the fact you will switch your phone off later.

To be able to buy something from machine, you will have to broadcast the spend to the Bitcoin network. The machine will check that. It would check against few nodes around the globe to get the transaction broadcasted.

farfiman

legendary

Activity: 1449

Merit: 1001

Quote from: Fiyasko on January 13, 2012, 02:05:46 PM

If anyone thinks they can make this system go faster, Then your either Not thinking it though, Or your smart as hell.

Im shocked at how fast they got it to go, What about people sending coins and then Not waiting for confirmations? Surely nobody wants an vending machine that has to sync to the blockchain, Wait 10mins for 1confirm just to get thier item, Im wondering how the HELL they managed to get it to go so fast, The only thing that i can think of is them skipping the Confirmation stages... But then that allows me to walk up, Dump 100coins in, Shut my phone internet off so that i dont resync and Bam, I have free credit in the machine untill i resync my phone with the blockchain.

Perhaps they do it with Prefunded accounts? Such as BitPay or e-wallet style services That way there Isnt a block chain, Just account to account....
...
I just see thse machines as "HACK ME NOW, PLEASE TRY TO HACK ME" subjects for people, Lol. Imagine these machines inside highschools, Sooooo many kids would be trying to mess with it

For the price of a coke ( or a few) they can take the risk. If they have 1000 machines that take bitcoin how many transactions will be not confirmed?

Piper67

legendary

Activity: 1106

Merit: 1001

Or... how long does it take to get a pack of popcorn out of a normal machine when you DON'T have a coin in your pocket? You have to get out of the building, go to the nearest convenience store, buy a pack of gum, get the change, walk back into the building, put the coin in the machine.

Look at all the steps you've saved just by pulling your cell phone out of your pocket and using Bitcoin!

:-)

Fiyasko

legendary

Activity: 1428

Merit: 1001

Okey Dokey Lokey

If anyone thinks they can make this system go faster, Then your either Not thinking it though, Or your smart as hell.

Im shocked at how fast they got it to go, What about people sending coins and then Not waiting for confirmations? Surely nobody wants an vending machine that has to sync to the blockchain, Wait 10mins for 1confirm just to get thier item, Im wondering how the HELL they managed to get it to go so fast, The only thing that i can think of is them skipping the Confirmation stages... But then that allows me to walk up, Dump 100coins in, Shut my phone internet off so that i dont resync and Bam, I have free credit in the machine untill i resync my phone with the blockchain.

Perhaps they do it with Prefunded accounts? Such as BitPay or e-wallet style services That way there Isnt a block chain, Just account to account....
...
I just see thse machines as "HACK ME NOW, PLEASE TRY TO HACK ME" subjects for people, Lol. Imagine these machines inside highschools, Sooooo many kids would be trying to mess with it

Dansker

hero member

Activity: 740

Merit: 500

Hello world!

Let's hope, that in a few years from now, people will look at this and go: "Did they really have to do all that, just to pay with BITCOIN?" since by then, paying with bitcoins would be easier that paying with coins.

Jan

legendary

Activity: 1043

Merit: 1002