BIP 0047 - Revision history

934: Update BIP text with latest version from https://github.com/bitcoin/bips/blob/9636d9c6831ff96a/bip-0047.mediawiki

2024-05-31T04:56:30Z

Update BIP text with latest version from https://github.com/bitcoin/bips/blob/9636d9c6831ff96a/bip-0047.mediawiki

← Older revision		Revision as of 04:56, 31 May 2024
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	==Status==		==Status==

	This BIP can be be considered final in terms of enabling compatibility with wallets that implement version 1 and version 2 reusable payment codes, however future developments of the reusable payment codes specification will not be distributed via the BIP process.		This BIP can be considered final in terms of enabling compatibility with wallets that implement version 1 and version 2 reusable payment codes, however future developments of the reusable payment codes specification will not be distributed via the BIP process.

	The Open Bitcoin Privacy Project RFC repo should be consulted for specifications related to version 3 or higher payment codes: https://github.com/OpenBitcoinPrivacyProject/rfc		The Open Bitcoin Privacy Project RFC repo should be consulted for specifications related to version 3 or higher payment codes: https://github.com/OpenBitcoinPrivacyProject/rfc
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	====Definitions====		====Definitions====

	* Notification change output: the change output from a notification transaction ~~which~~ which resides in the sender's wallet, but can be automatically located by the intended recipient		* Notification change output: the change output from a notification transaction which resides in the sender's wallet, but can be automatically located by the intended recipient
	* Payment code identifier: a 33 byte representation of a payment code constructed by prepending 0x02 to the SHA256 hash of the binary serialization of the payment code		* Payment code identifier: a 33 byte representation of a payment code constructed by prepending 0x02 to the SHA256 hash of the binary serialization of the payment code

	====Notification Transaction====		====Notification Transaction====

	Note: this procedure is used if Bob uses a version 2 payment code (regardless of ~~the~~ the version of Alice's payment code). If Bob's payment code is not version 2, see the appropriate section in this specification.		Note: this procedure is used if Bob uses a version 2 payment code (regardless of the version of Alice's payment code). If Bob's payment code is not version 2, see the appropriate section in this specification.

	# Construct a notification transaction as per the version 1 instructions, except do not create the output to Bob's notification address		# Construct a notification transaction as per the version 1 instructions, except do not create the output to Bob's notification address

934: Update BIP text with latest version from https://github.com/bitcoin/bips/blob/758a58ab54fddce0/bip-0047.mediawiki

2024-05-29T04:33:30Z

Update BIP text with latest version from https://github.com/bitcoin/bips/blob/758a58ab54fddce0/bip-0047.mediawiki

← Older revision		Revision as of 04:33, 29 May 2024
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	Recovering a wallet from a seed, however, does require access to a fully-indexed blockchain.		Recovering a wallet from a seed, however, does require access to a fully-indexed blockchain.

	The required data may be obtained from copy of the blockchain under the control of the user, or via a publicly-~~queriable~~ blockchain explorer.		The required data may be obtained from copy of the blockchain under the control of the user, or via a publicly-queryable blockchain explorer.

	When querying a public blockchain explorer, wallets SHOULD connect to the explorer through Tor (or equivalent) and SHOULD avoid grouping queries in a manner that associates ephemeral addresses with each other.		When querying a public blockchain explorer, wallets SHOULD connect to the explorer through Tor (or equivalent) and SHOULD avoid grouping queries in a manner that associates ephemeral addresses with each other.

934: Update BIP text with latest version from https://github.com/bitcoin/bips/blob/e43c18ba400983a2/bip-0047.mediawiki

2024-04-24T18:29:50Z

Update BIP text with latest version from https://github.com/bitcoin/bips/blob/e43c18ba400983a2/bip-0047.mediawiki

← Older revision		Revision as of 18:29, 24 April 2024
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	RECENT CHANGES:		RECENT CHANGES:
			* (15 Feb 2021) Finalize specification
			* (28 Sep 2017) Adjust text to match test vectors
	* (19 Apr 2016) Define version 2 payment codes		* (19 Apr 2016) Define version 2 payment codes
	* (17 Apr 2016) Clarify usage of outpoints in notification transactions
	* (18 Dec 2015) Update explanations to resolve FAQs

	<pre>		<pre>
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	Comments-Summary: Unanimously Discourage for implementation		Comments-Summary: Unanimously Discourage for implementation
	Comments-URI: https://github.com/bitcoin/bips/wiki/Comments:BIP-0047		Comments-URI: https://github.com/bitcoin/bips/wiki/Comments:BIP-0047
	Status: ~~Draft~~		Status: Final
	Type: Informational		Type: Informational
	Created: 2015-04-24		Created: 2015-04-24
	</pre>		</pre>

			==Status==

			This BIP can be be considered final in terms of enabling compatibility with wallets that implement version 1 and version 2 reusable payment codes, however future developments of the reusable payment codes specification will not be distributed via the BIP process.

			The Open Bitcoin Privacy Project RFC repo should be consulted for specifications related to version 3 or higher payment codes: https://github.com/OpenBitcoinPrivacyProject/rfc

	==Abstract==		==Abstract==
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	## Alice selects the public key associated with Bob's notification address: <pre>B, where B = bG</pre>		## Alice selects the public key associated with Bob's notification address: <pre>B, where B = bG</pre>
	## Alice calculates a secret point: <pre>S = aB</pre>		## Alice calculates a secret point: <pre>S = aB</pre>
	## Alice calculates a 64 byte blinding factor: <pre>s = HMAC-SHA512(x~~, o~~)</pre>		## Alice calculates a 64 byte blinding factor: <pre>s = HMAC-SHA512(o, x)</pre>
	### "x" is the x value of the secret point		### "x" is the x value of the secret point
	### "o" is the outpoint being spent by the designated input		### "o" is the outpoint being spent by the designated input

934: Update BIP text with latest version from https://github.com/bitcoin/bips/blob/9600cefc3c77aac3/bip-0047.mediawiki

2024-04-24T15:29:59Z

Update BIP text with latest version from https://github.com/bitcoin/bips/blob/9600cefc3c77aac3/bip-0047.mediawiki

← Older revision		Revision as of 15:29, 24 April 2024
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	<img src="bip-0047/reusable_payment_codes-05.png" />		<img src="bip-0047/reusable_payment_codes-05.png" />
	# Bob is watching for incoming payments on B' ever since he received the notification transaction from Alice.		# Bob is watching for incoming payments on B' ever since he received the notification transaction from Alice.
	## Bob calculates n shared secrets with Alice, using the 0<sup>th</sup> public key derived Alice's payment code, and private keys 0 - n derived from Bob's payment code, where n is his desired lookahead window.		## Bob calculates n shared secrets with Alice, using the 0<sup>th</sup> public key derived from Alice's payment code, and private keys 0 - n derived from Bob's payment code, where n is his desired lookahead window.
	## Bob calculates the ephemeral deposit addresses using the same procedure as Alice: <pre>B' = B + sG</pre>		## Bob calculates the ephemeral deposit addresses using the same procedure as Alice: <pre>B' = B + sG</pre>
	## Bob calculate the private key for each ephemeral address as: <pre>b' = b + s</pre>		## Bob calculate the private key for each ephemeral address as: <pre>b' = b + s</pre>

934: Update BIP text with latest version from https://github.com/bitcoin/bips/blob/ea6e905d6103fcd6/bip-0047.mediawiki

2024-04-23T22:59:19Z

Update BIP text with latest version from https://github.com/bitcoin/bips/blob/ea6e905d6103fcd6/bip-0047.mediawiki

← Older revision		Revision as of 22:59, 23 April 2024
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	Prior to the first time Alice initiates a transaction to Bob, Alice MUST inform Bob of her payment code via the following procedure:		Prior to the first time Alice initiates a transaction to Bob, Alice MUST inform Bob of her payment code via the following procedure:

	Note: this procedure is used if Bob uses a version 1 payment code (regardless of ~~the~~ the version of Alice's payment code). If Bob's payment code is not version 1, see the appropriate section in this specification.		Note: this procedure is used if Bob uses a version 1 payment code (regardless of the version of Alice's payment code). If Bob's payment code is not version 1, see the appropriate section in this specification.

	# Alice constructs a transaction which sends a small quantity of bitcoins to Bob's notification address (notification transaction)		# Alice constructs a transaction which sends a small quantity of bitcoins to Bob's notification address (notification transaction)

934: Update BIP text with latest version from https://github.com/bitcoin/bips/blob/b5723035e23896d0/bip-0047.mediawiki

2019-09-24T18:00:57Z

Update BIP text with latest version from https://github.com/bitcoin/bips/blob/b5723035e23896d0/bip-0047.mediawiki

Show changes

Spaz926 at 02:31, 12 February 2016

2016-02-12T02:31:49Z

← Older revision		Revision as of 02:31, 12 February 2016
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	</pre>		</pre>

	{{BipMoved\|bip-~~0010~~.mediawiki}}		{{BipMoved\|bip-0047.mediawiki}}

	[[Category:BIP\|D]]		[[Category:BIP\|D]]

Spaz926: Created page with "{{bip}}

   BIP: 47   Title: Reusable Payment Codes for Hierarchical Deterministic Wallets   Author: Justus Ranvier    Status: Draft..."

2016-02-12T02:30:03Z

Created page with "{{bip}} <pre> BIP: 47 Title: Reusable Payment Codes for Hierarchical Deterministic Wallets Author: Justus Ranvier <justus@openbitcoinprivacyproject.org> Status: Draft..."

New page

{{bip}}

<pre>
BIP: 47
Title: Reusable Payment Codes for Hierarchical Deterministic Wallets
Author: Justus Ranvier <justus@openbitcoinprivacyproject.org>
Status: Draft
Type: Informational
Created: 2015-04-24
</pre>

{{BipMoved|bip-0010.mediawiki}}

[[Category:BIP|D]]