QuBit - P2QRH spending rules

bip-p2qrh.mediawiki

@@ -113,7 +113,7 @@ Additionally, it should be noted, whether an output with a P2QRH spend script co
 
 While it might be seen as a maintenance burden for bitcoin ecosystem devs to go from a single cryptosystem implementation to four additional distinct PQC cryptosystems-- and it most certainly is-- the ramifications of a chain broken through extrinsic factors should provide sufficient motivation. An increase in software maintenance everywhere signatures are used should be seen as an acceptable compromise for maintained integrity of bitcoin transfers during a regime of quantum advantage.
 
-The inclusion of these four cryptosystems: SPHINCS, XMSS, FALCON, and SQIsign have various advocates within the community due to their varying security assumptions. Hash-based cryptosystems are more conservative, time-tested, and well-reviewed. Lattice cryptography is relatively new and introduces novel security assumptions to Bitcoin, but their signatures are smaller and might be considered by some to be an adequate alternative to Hash-based signatures. SQIsign is much smaller, however, it is based on a very novel form of cryptography known as supersingular elliptic curve quaternion isogeny, and at the time of writing, is not yet approved by NIST or the broader PQC community.
+The inclusion of these four cryptosystems: SPHINCS, CRYSTALS-Dilithium, FALCON, and SQIsign have various advocates within the community due to their varying security assumptions. Hash-based cryptosystems are more conservative, time-tested, and well-reviewed. Lattice cryptography is relatively new and introduces novel security assumptions to Bitcoin, but their signatures are smaller and might be considered by some to be an adequate alternative to Hash-based signatures. SQIsign is much smaller, however, it is based on a very novel form of cryptography known as supersingular elliptic curve quaternion isogeny, and at the time of writing, is not yet approved by NIST or the broader PQC community.
 
 In the distant future, following the implementation of the P2QRH address format in a QuBit soft fork, there will likely be a need for Pay to Quantum Secure (P2QS) addresses. These will require specialized quantum hardware for signing, while still [https://quantum-journal.org/papers/q-2023-01-19-901/ using public keys that are verifiable via classical means]. Additional follow-on BIPs will be needed to implement P2QS. However, until specialized quantum cryptography hardware is widespread, quantum resistant addresses should be an adequate intermediate solution.
 
@@ -260,6 +260,7 @@ TBD
 
 To help implementors understand updates to this BIP, we keep a list of substantial changes.
 
+* 2024-10-21 - Replace XMSS with CRYSTALS-Dilithium due to NIST approval and size constraints.
 * 2024-09-30 - Refactor the ECC vs PoW section. Swap quitness for attestation.
 * 2024-09-29 - Update section on PoW to include partial-preimage.
 * 2024-09-28 - Add Winternitz, XMSS signatures, and security assumption types to PQC table. Omit NIST I table. Add spend script specification. Add revealed public key scenario table.