In-store Transactions - Revision history

Newar at 16:20, 1 November 2014

2014-11-01T16:20:21Z

← Older revision		Revision as of 16:20, 1 November 2014
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	== Smart phones ==		== Smart phones ==

	The best solution is to use smart phones. Communication can be via QR codes, unencrypted Bluetooth or using NFC. ~~Near field communications~~ is a form of radio that travels only a few centimeters, so to use it devices must be touched together. In such a setup, you touch your phone to another NFC aware device like another phone, or for the supermarket a simple NFC transmitter. That device sends a Bitcoin address and a requested amount, which is displayed on the devices screen. Confirming the payment causes the phone to create, sign and broadcast the Bitcoin transaction as normal. The supermarkets Bitcoin node will receive the transaction a few seconds later.		The best solution is to use smart phones. Communication can be via QR codes<ref>[https://bitcoin.stackexchange.com/questions/8111/what-are-qr-codes-and-how-do-you-use-them-as-request-payment-from-wallet What are QR codes and How do you use them as request payment from Wallet?]</ref>, unencrypted Bluetooth<ref>[https://bitcointalk.org/index.php?topic=278237.0 Offline Transactions and Bluetooth!]</ref> or using Near Field Communications (NFC)<ref>[https://bitcointalk.org/index.php?topic=29490.0 NFC initiated Bitcoin payments with Bitcoin Wallet for Android]</ref>. NFC is a form of radio that travels only a few centimeters, so to use it devices must be touched together. In such a setup, you touch your phone to another NFC aware device like another phone, or for the supermarket a simple NFC transmitter. That device sends a Bitcoin address and a requested amount, which is displayed on the devices screen. Confirming the payment causes the phone to create, sign and broadcast the Bitcoin transaction as normal. The supermarkets Bitcoin node will receive the transaction a few seconds later.

	To ensure you're paying who you think you're paying, the address can itself be signed with an ~~'extended validation' certificate~~ as issued by various SSL certificate authorities. The EV standard and auditing process ensures they are only issued to organizations that can prove their identity to a high level of assurance. The phone can then show the organizational name rather than the raw Bitcoin address.		To ensure you're paying who you think you're paying, the address can itself be signed with an Extended Validation Certificate (EV)<ref>[https://en.wikipedia.org/wiki/Extended_Validation_Certificate Extended Validation Certificate]</ref> as issued by various SSL certificate authorities. The EV standard and auditing process ensures they are only issued to organizations that can prove their identity to a high level of assurance. The phone can then show the organizational name rather than the raw Bitcoin address.

	An alternative to EV issued certificate signing would be to have the merchant sign a one-time string using the private key of the intended payment address. While not as verifiable as an EV certificate signature it would at least ensure that the merchant is in possession of the corresponding private key for the payment address. This gives at least as much confidence in the transaction as current cash transactions.		An alternative to EV issued certificate signing would be to have the merchant sign a one-time string using the private key of the intended payment address. While not as verifiable as an EV certificate signature it would at least ensure that the merchant is in possession of the corresponding private key for the payment address. This gives at least as much confidence in the transaction as current cash transactions.
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	== Paper Bitcoins ==		== Paper Bitcoins ==

	Another common way to pay at the supermarket is with paper money. There have been various efforts to allow Bitcoins to be printed out and passed around, for instance [http://~~www~~.~~bitcoin~~.org/~~smf~~/~~index~~.~~php?topic=3716~~.~~0 this one~~]. The private keys are printed on the paper. But putting private keys on the paper itself simply means anyone who receives the note can take away the underlying Bitcoins backing it.		Another common way to pay at the supermarket is with paper money. There have been various efforts to allow Bitcoins to be printed out and passed around, for instance using this python script<ref>[http://web.archive.org/web/20110529121124/http://bitcoin.modernjob.info/print.html Instant printable bitcoins (Internet Archive copy)]</ref>. The private keys are printed on the paper. But putting private keys on the paper itself simply means anyone who receives the note can take away the underlying Bitcoins backing it.

	Solution to this would be to create a paper money where you can see if someone have been using the private key, and a solution to this is found here [http://bitbills.com/ Bitbills]. But even this is secure (or secure enough) only through huge anti-counterfeiting efforts by a large central authority, in the USA this is the Secret Service. The techniques of making paper money hard to forge are not widely available.		Solution to this would be to create a paper money where you can see if someone have been using the private key, and a solution to this is found here [http://bitbills.com/ Bitbills]. But even this is secure (or secure enough) only through huge anti-counterfeiting efforts by a large central authority, in the USA this is the Secret Service. The techniques of making paper money hard to forge are not widely available.
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	* [[BitcoinNotify]]		* [[BitcoinNotify]]
	* [[Open Transactions]]		* [[Open Transactions]]

			==References==
			<references />

	[[Category:Technical]]		[[Category:Technical]]

Newar: /* Smart phones */

2014-11-01T15:26:45Z

Smart phones

← Older revision		Revision as of 15:26, 1 November 2014
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	== Smart phones ==		== Smart phones ==

	The best solution is to use smart phones. Communication can be via unencrypted Bluetooth or using NFC. Near field communications is a form of radio that travels only a few centimeters, so to use it devices must be touched together. In such a setup, you touch your phone to another NFC aware device like another phone, or for the supermarket a simple NFC transmitter. That device sends a Bitcoin address and a requested amount, which is displayed on the devices screen. Confirming the payment causes the phone to create, sign and broadcast the Bitcoin transaction as normal. The supermarkets Bitcoin node will receive the transaction a few seconds later.		The best solution is to use smart phones. Communication can be via QR codes, unencrypted Bluetooth or using NFC. Near field communications is a form of radio that travels only a few centimeters, so to use it devices must be touched together. In such a setup, you touch your phone to another NFC aware device like another phone, or for the supermarket a simple NFC transmitter. That device sends a Bitcoin address and a requested amount, which is displayed on the devices screen. Confirming the payment causes the phone to create, sign and broadcast the Bitcoin transaction as normal. The supermarkets Bitcoin node will receive the transaction a few seconds later.

	To ensure you're paying who you think you're paying, the address can itself be signed with an 'extended validation' certificate as issued by various SSL certificate authorities. The EV standard and auditing process ensures they are only issued to organizations that can prove their identity to a high level of assurance. The phone can then show the organizational name rather than the raw Bitcoin address.		To ensure you're paying who you think you're paying, the address can itself be signed with an 'extended validation' certificate as issued by various SSL certificate authorities. The EV standard and auditing process ensures they are only issued to organizations that can prove their identity to a high level of assurance. The phone can then show the organizational name rather than the raw Bitcoin address.

Sgornick: Use general EWallet over a specific EWallet provider.

2012-11-27T18:03:39Z

Use general EWallet over a specific EWallet provider.

← Older revision		Revision as of 18:03, 27 November 2012
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	A common question people have about Bitcoin is how it can be used for in-person transactions, like at a supermarket.		A common question people have about Bitcoin is how it can be used for in-person transactions, like at a supermarket.

	Today, Bitcoin is software that runs on your desktop or laptop computer. You can also host your wallet with an ~~online service like MyBitcoin~~. Neither solution is convenient for the supermarket use case. The most commonly proposed solutions are examined below.		Today, Bitcoin is software that runs on your desktop or laptop computer. You can also host your wallet with an [[EWallet]]. Neither solution is convenient for the supermarket use case. The most commonly proposed solutions are examined below.

	__TOC__		__TOC__

ThomasV at 09:30, 23 April 2012

2012-04-23T09:30:29Z

← Older revision		Revision as of 09:30, 23 April 2012
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	== Smart cards ==		== Smart cards ==

			''see also: [[Smart card wallet]]''

	Today one of the most common ways to pay in supermarkets is with cards you either swipe (magstripe cards) or insert into a reader and enter a PIN (smartcards). It's natural to think of applying the same techniques to Bitcoin, for instance by putting the private keys inside the card.		Today one of the most common ways to pay in supermarkets is with cards you either swipe (magstripe cards) or insert into a reader and enter a PIN (smartcards). It's natural to think of applying the same techniques to Bitcoin, for instance by putting the private keys inside the card.

Sgornick: Add entry for BitcoinNotify to See Also.

2011-08-08T19:26:51Z

Add entry for BitcoinNotify to See Also.

← Older revision		Revision as of 19:26, 8 August 2011
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	* [[Merchant Howto]]		* [[Merchant Howto]]
			* [[BitcoinNotify]]
	* [[Open Transactions]]		* [[Open Transactions]]

	[[Category:Technical]]		[[Category:Technical]]

Sgornick: /* See Also */ Fix link, ima dipshit.

2011-06-12T12:52:38Z

Sgornick: /* See Also */ Fix link. Dash?

2011-06-12T12:52:00Z

Sgornick: /* See Also */ x

2011-06-12T12:51:36Z

Sgornick: /* See Also */ Add entry for In-store Transactions article.

2011-06-12T12:50:26Z

See Also: Add entry for In-store Transactions article.

← Older revision		Revision as of 12:50, 12 June 2011
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	* [[Merchant Howto]]		* [[Merchant Howto]]
			* [[In-store Transactions]]

	[[Category:Technical]]		[[Category:Technical]]

Mike at 14:19, 11 June 2011

2011-06-11T14:19:42Z

← Older revision		Revision as of 14:19, 11 June 2011
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	A common question people have about Bitcoin is how it can be used for in-person transactions, like at a supermarket.		A common question people have about Bitcoin is how it can be used for in-person transactions, like at a supermarket.

	Today, Bitcoin is software that runs on your desktop or laptop computer. You can also host your wallet with an online service like MyBitcoin. Neither solution is convenient for the supermarket use case. The most commonly proposed solutions are:		Today, Bitcoin is software that runs on your desktop or laptop computer. You can also host your wallet with an online service like MyBitcoin. Neither solution is convenient for the supermarket use case. The most commonly proposed solutions are examined below.

	__TOC__		__TOC__

	~~We examine these solutions here.~~

	== Smart phones ==		== Smart phones ==

← Older revision		Revision as of 12:52, 12 June 2011
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	* [[Merchant Howto]]		* [[Merchant Howto]]
	* [[~~In\-store~~ Transactions]]		* [[Open Transactions]]

	[[Category:Technical]]		[[Category:Technical]]

← Older revision		Revision as of 12:52, 12 June 2011
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	==See Also==		==See Also==

	* [[In-store Transactions]]
	* [[Merchant Howto]]		* [[Merchant Howto]]
			* [[In\-store Transactions]]

	[[Category:Technical]]		[[Category:Technical]]

← Older revision		Revision as of 12:51, 12 June 2011
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	==See Also==		==See Also==

			* [[In-store Transactions]]
	* [[Merchant Howto]]		* [[Merchant Howto]]
	* [[In-store Transactions]]

	[[Category:Technical]]		[[Category:Technical]]