Address reuse - Revision history

Belcher: /* Worked Example 4 */ Clarify

2021-04-11T22:41:05Z

Worked Example 4: Clarify

← Older revision		Revision as of 22:41, 11 April 2021
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	* You want to [[Receiving donations with bitcoin\|accept donations in bitcoin]], so you publish a single reused bitcoin address on your website.		* You want to [[Receiving donations with bitcoin\|accept donations in bitcoin]], so you publish a single reused bitcoin address on your website.
	* Some people want to donate to you by buying bitcoins from an exchange and have the coins sent immediately to your donation address.		* Some people want to donate to you by buying bitcoins from an exchange and have the coins sent immediately to your donation address.
	* Unlucky for you, the exchange wants to block donations to you, so it does not allow people to send coins to ~~you~~.		* Unlucky for you, the exchange wants to block donations to you, so it does not allow people to send coins to your address.
	* The way to solve this is to avoid address reuse by displaying a brand new address to each visitor. That visitor can tell the exchange to send coins to that address. Because the address is new and unused the exchange will have no idea that it belongs to you, and so will be unable to block the transfer.		* The way to solve this is to avoid address reuse by displaying a brand new address to each visitor. That visitor can tell the exchange to send coins to that address. Because the address is new and unused the exchange will have no idea that it belongs to you, and so will be unable to block the transfer.

Belcher: /* Problems */ Add section on censorship resistance

2021-04-10T22:51:04Z

Problems: Add section on censorship resistance

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 * Your shopkeeper can see your spending. Gossip gets around of how much you spend on pornography and how little on church donations.
 * Your employer can see your spending. When you pay labour union dues or donate to wikileaks or another non-profit, your boss knows who not to trust.
 === Security ===

Belcher: Added references section and to category Privacy

2019-02-15T19:50:07Z

Added references section and to category Privacy

← Older revision		Revision as of 19:50, 15 February 2019
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	* Many bitcoin mining pools (especially [[Eligius]])		* Many bitcoin mining pools (especially [[Eligius]])
	* [[Paper wallet]] which use a single bitcoin private key/address pair		* [[Paper wallet]] which use a single bitcoin private key/address pair

			==References==
			<references />

			[[Category:Privacy]]

Belcher: Add mention about all good wallets using HD keys

2018-11-24T17:39:52Z

Add mention about all good wallets using HD keys

← Older revision		Revision as of 17:39, 24 November 2018
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	It has been argued that the phrase "bitcoin address" was a bad name for this object. A better name would be something like "bitcoin invoice".		It has been argued that the phrase "bitcoin address" was a bad name for this object. A better name would be something like "bitcoin invoice".

			All good wallets today use [[Deterministic wallet]]s and have a user interface which make it easy and safe to have many wallet [[address]]es. Previously (before around 2013) this was not the case as creating new addresses could invalidate backups leading to loss of funds.

	== Problems ==		== Problems ==

Belcher: typo

2018-11-16T15:37:00Z

typo

← Older revision		Revision as of 15:37, 16 November 2018
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	~~<sup>Superscript text</sup>~~'''Address reuse''' refers to the use of the same [[address]] for multiple [[transactions]]. It is an unintended practice, abusing the privacy and security of the participants of the transactions as well as future holders of their value. It also only functions by accident, not by design, so cannot be depended on to work reliably.		'''Address reuse''' refers to the use of the same [[address]] for multiple [[transactions]]. It is an unintended practice, abusing the privacy and security of the participants of the transactions as well as future holders of their value. It also only functions by accident, not by design, so cannot be depended on to work reliably.

	The most private and secure way to use bitcoin is to send a brand new address to each person who pays you. After the received coins have been spent the address should never be used again. Also when sending money to people always ask them for a brand new bitcoin address.		The most private and secure way to use bitcoin is to send a brand new address to each person who pays you. After the received coins have been spent the address should never be used again. Also when sending money to people always ask them for a brand new bitcoin address.

Belcher: Fix typo

2018-11-16T15:36:46Z

Fix typo

← Older revision		Revision as of 15:36, 16 November 2018
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	'''Address reuse''' refers to the use of the same [[address]] for multiple [[transactions]]. It is an unintended practice, abusing the privacy and security of the participants of the transactions as well as future holders of their value. It also only functions by accident, not by design, so cannot be depended on to work reliably.		<sup>Superscript text</sup>'''Address reuse''' refers to the use of the same [[address]] for multiple [[transactions]]. It is an unintended practice, abusing the privacy and security of the participants of the transactions as well as future holders of their value. It also only functions by accident, not by design, so cannot be depended on to work reliably.

	The most private and secure way to use bitcoin ~~address~~ is to send a brand new address to each person who pays you. After the received coins have been spent the address should never be used again. Also, when sending money to people always ask them for a brand new bitcoin address.		The most private and secure way to use bitcoin is to send a brand new address to each person who pays you. After the received coins have been spent the address should never be used again. Also when sending money to people always ask them for a brand new bitcoin address.

	It has been argued that the phrase "bitcoin address" was a bad name for this object. A better name would be something like "bitcoin invoice".		It has been argued that the phrase "bitcoin address" was a bad name for this object. A better name would be something like "bitcoin invoice".

Belcher: Add a short summary of how to use addresses, and suggest the name is wrong

2018-11-16T15:35:40Z

Add a short summary of how to use addresses, and suggest the name is wrong

← Older revision		Revision as of 15:35, 16 November 2018
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	'''Address reuse''' refers to the use of the same [[address]] for multiple [[transactions]]. It is an unintended practice, abusing the privacy and security of the participants of the transactions as well as future holders of their value. It also only functions by accident, not by design, so cannot be depended on to work reliably.		'''Address reuse''' refers to the use of the same [[address]] for multiple [[transactions]]. It is an unintended practice, abusing the privacy and security of the participants of the transactions as well as future holders of their value. It also only functions by accident, not by design, so cannot be depended on to work reliably.

			The most private and secure way to use bitcoin address is to send a brand new address to each person who pays you. After the received coins have been spent the address should never be used again. Also, when sending money to people always ask them for a brand new bitcoin address.

			It has been argued that the phrase "bitcoin address" was a bad name for this object. A better name would be something like "bitcoin invoice".

	== Problems ==		== Problems ==

Belcher: /* Privacy */ Add worked example about exchange front running

2018-10-28T16:51:36Z

Privacy: Add worked example about exchange front running

← Older revision		Revision as of 16:51, 28 October 2018
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	See also: [http://www.bitcoinnotbombs.com/innovations-that-enhance-bitcoin-anonymity/ Innovations that Enhance Bitcoin Anonymity]		See also: [http://www.bitcoinnotbombs.com/innovations-that-enhance-bitcoin-anonymity/ Innovations that Enhance Bitcoin Anonymity]

	==== Worked Example 1 ====		==== Worked Example 1 - Savings Revealed ====
	* You save in bitcoin, using a [[Paper Wallet \| single-address paper wallet]].		* You save in bitcoin, using a [[Paper Wallet \| single-address paper wallet]].
	* All your bitcoin savings to this same address, let's say it contains $1 million worth.		* All your bitcoin savings to this same address, let's say it contains $1 million worth.
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	* Word gets around. A burglar raids your home. Kidnappers capture your children and know exactly how much to demand in ransom.		* Word gets around. A burglar raids your home. Kidnappers capture your children and know exactly how much to demand in ransom.

	==== Worked Example 2 ====		==== Worked Example 2 - Exchange Front Running ====
			* You have an account on a bitcoin [[exchange]], you want to deposit some bitcoins to sell.
			* You send bitcoins to the same exchange deposit address you have used in the past.
			* Because of the address reuse, its easy to see on the blockchain that some bitcoins are being sent to an exchange.
			* The exchange requires 3 [[confirmation]]s before crediting your account, but in that time the price has already moved against you as other traders become aware of your deposit transaction.
			* You sell the bitcoins for a less attractive price than you otherwise would have.
			* This is easily avoided by clicking the '''Generate New Deposit Address''' button on the exchange's website and depositing there.

			==== Worked Example 3 ====
	* You use a single Bitcoin address for all your earning and spending. Anyone you trade with can see a complete history of your finances.		* You use a single Bitcoin address for all your earning and spending. Anyone you trade with can see a complete history of your finances.
	* Your landlord can see your salary, when he raises the rent he knows exactly how much to ask for.		* Your landlord can see your salary, when he raises the rent he knows exactly how much to ask for.

Belcher: /* Notable offenders */ electrum doesn't display individual addresses by default anymore, although paper wallets do

2017-04-03T11:12:06Z

Notable offenders: electrum doesn't display individual addresses by default anymore, although paper wallets do

← Older revision		Revision as of 11:12, 3 April 2017
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	Some notable Bitcoin software and services encourage or require address reuse:		Some notable Bitcoin software and services encourage or require address reuse:
	* Many bitcoin mining pools (especially [[Eligius]])		* Many bitcoin mining pools (especially [[Eligius]])
	* ~~Electrum displays addresses in~~ a ~~way that encourages confusion and~~ address ~~reuse and misuse.~~		* [[Paper wallet]] which use a single bitcoin private key/address pair

JonathanCross: Linking address and transactions

2016-01-29T14:21:55Z

Linking address and transactions

← Older revision		Revision as of 14:21, 29 January 2016
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	'''Address reuse''' refers to the use of the same address for multiple transactions. It is an unintended practice, abusing the privacy and security of the participants of the transactions as well as future holders of their value. It also only functions by accident, not by design, so cannot be depended on to work reliably.		'''Address reuse''' refers to the use of the same [[address]] for multiple [[transactions]]. It is an unintended practice, abusing the privacy and security of the participants of the transactions as well as future holders of their value. It also only functions by accident, not by design, so cannot be depended on to work reliably.

	== Problems ==		== Problems ==