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add recommended handling for notification tx change outputs

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Justus Ranvier 2016-04-19 13:03:13 -05:00
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@ -194,6 +194,17 @@ Alice SHOULD use an input script in one of the following standard forms to expos
Compatible wallets MAY provide a method for a user to manually specify the public key associated with a notification transaction in order to recover payment codes sent via non-standard notification transactions.
=====Post-Notification Privacy Considerations=====
Incautious handling of change outputs from notification transactions may cause unintended loss of privacy.
The recipient of a transaction which spends a change output from a prior notification transaction will learn about the potential connection between the sender and the recipient of the notification transaction.
The following actions are recommended to reduce this risk:
* Wallets which support mixing SHOULD mix change outputs from notification transactions prior to spending them
* Wallets which do not support mixing MAY simulate mixing by creating a transaction which spends the change output to the next external BIP44 address
====Sending====
# Each time Alice wants to initiate a transaction to Bob, Alice derives a unique P2PKH address for the transaction using ECDH follows: