Merge pull request bitcoin#1068 from OpenBitcoinPrivacyProject/bip47

Finalize BIP-47

Author: murchandamus

bip-0047.mediawiki

@@ -1,7 +1,7 @@
 RECENT CHANGES:
+* (15 Feb 2021) Finalize specification
+* (28 Sep 2017) Adjust text to match test vectors
 * (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>
   BIP: 47
@@ -10,11 +10,17 @@ RECENT CHANGES:
   Author: Justus Ranvier <[email protected]>
   Comments-Summary: Unanimously Discourage for implementation
   Comments-URI: https://github.com/bitcoin/bips/wiki/Comments:BIP-0047
-  Status: Draft
+  Status: Final
   Type: Informational
   Created: 2015-04-24
 </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==
 
 This BIP defines a technique for creating a payment code which can be publicly advertised and associated with a real-life identity without creating the loss of security or privacy inherent to P2PKH address reuse.
@@ -158,7 +164,7 @@ Note: this procedure is used if Bob uses a version 1 payment code (regardless of
 ## Alice selects the private key corresponding to the designated pubkey: <pre>a</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 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
 ### "o" is the outpoint being spent by the designated input
 # Alice serializes her payment code in binary form.