Add Spacebear's clarifications

Co-authored-by: spacebear <[email protected]>

bip-0077.mediawiki

@@ -233,7 +233,7 @@ All ciphertexts should be padded to the same length of 7168 bytes to prevent tra
 
 Hybrid Public Key Encryption (HPKE) is a modern web standard for secure message exchange without TLS. Since client and server agree on a configuration out of band, we can pre-define the Payjoin version 2 application specific configuration to use DHKEM(Secp256k1, HKDF-SHA256) and ChaCha20Poly1305 AEAD.
 
-The cryptographic handshake is conducted in parallel to the payjoin messaging inspired by the [[http://www.noiseprotocol.org/noise.html#zero-rtt-and-noise-protocols| zero-RTT]] version of the [[http://www.noiseprotocol.org/noise.html| Noise Framework]] [[https://noiseexplorer.com/patterns/IK/| IK]] pattern. A receiver shares its public key out of band in the BIP 21 URI. Static keys shared in URIs must only be used for a single Payjoin Session. The key is encoded in [[https://datatracker.ietf.org/doc/html/rfc4648#section-5| base64url]] encoding as a Payjoin Directory subdirectory in the <code>pj=</code> parameter.
+The cryptographic handshake is conducted in parallel to the payjoin messaging inspired by the [[http://www.noiseprotocol.org/noise.html#zero-rtt-and-noise-protocols| zero-RTT]] version of the [[http://www.noiseprotocol.org/noise.html| Noise Framework]] [[https://noiseexplorer.com/patterns/NKpsk0/| IK]] pattern. A receiver shares its public key out of band in the BIP 21 URI. Static keys shared in URIs must only be used for a single Payjoin Session. The key is encoded in [[https://datatracker.ietf.org/doc/html/rfc4648#section-5| base64url]] encoding as a Payjoin Directory subdirectory in the <code>pj=</code> parameter.
 
 ====Secp256k1-based DHKEM====