[ZIP 227]: Register ZIP 248 bundle type.

- Register ZSA Issuance bundle type in the V6 bundle registry
- Update digest section to reference effects_bundles_digest and auth_bundles_digest
- Add reference to extensible transaction format ZIP
- Remove unused ZIP 244 and ZIP 246 references

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: nuttycom

zips/zip-0227.rst

@@ -308,6 +308,28 @@ where $\mathsf{GroupHash}^\mathbb{P}$ is defined as in [#protocol-concretegrouph
     Diagram relating the Issuer identifier, asset description, asset description hash, Asset Identifier, Asset Digest, and Asset Base for the OrchardZSA Protocol.
 
 
+Bundle Type Registration
+========================
+
+This ZIP registers the ZSA Issuance bundle type in the V6 transaction bundle
+type registry defined in ZIP 248 [#zip-0248]_:
+
++------------+----------------------+--------------------+------------------+--------------+
+| BundleType | ``mValuePoolDeltas`` | ``mEffectBundles`` | ``mAuthBundles`` | Bundle kind  |
++============+======================+====================+==================+==============+
+| TBD        |✅                    |✅                  |✅                | ZSA Issuance |
++------------+----------------------+--------------------+------------------+--------------+
+
+The ZSA Issuance bundle has value pool deltas (issuance adds value to the
+transparent transaction value pool for Custom Assets), effecting data (the
+issuance actions and issue notes), and authorizing data (the issuance
+authorization signature).
+
+The effecting data for the ZSA Issuance bundle is encoded as specified in
+`Issuance Bundle`_. The authorizing data consists of the ``issueAuthSig``
+field.
+
+
 Specification: Issue Note, Issuance Action, Issuance Bundle and Issuance Protocol
 =================================================================================
 
@@ -593,12 +615,17 @@ Concrete Applications
 
 
 
-Modifications relative to ZIP 244 [#zip-0244]_
-==============================================
+Modifications to Digest Algorithms
+==================================
+
+The ZSA Issuance bundle contributes to the transaction identifier and signature
+digest via the ``effects_bundles_digest`` and ``auth_bundles_digest`` defined
+in ZIP 248 [#zip-0248]_.
 
-Relative to the sighash algorithm defined in ZIP 244, the sighash algorithm
-that applies to v6 transactions differs by including the issuance bundle
-components within the tree hash. See ZIP 246 [#zip-0246]_ for details.
+The issuance bundle's value pool deltas are committed via
+``value_pool_deltas_digest``. The issuance effecting data (issuance actions and
+issue notes) is committed via ``effects_bundles_digest``. The issuance
+authorization signature is committed via ``auth_bundles_digest``.
 
 
 Changes to ZIP 317 [#zip-0317]_
@@ -695,8 +722,7 @@ References
 .. [#zip-0230-issuance-action-description] `ZIP 230: Version 6 Transaction Format — Issuance Action Description (IssueAction) <zip-0230.rst#issuance-action-description-issueaction>`_
 .. [#zip-0230-issue-note] `ZIP 230: Version 6 Transaction Format — Issue Note Description (IssueNoteDescription) <zip-0230.rst#issue-note-description-issuenotedescription>`_
 .. [#zip-0230-transaction-format] `ZIP 230: Version 6 Transaction Format — Transaction Format <zip-0230.rst#transaction-format>`_
-.. [#zip-0244] `ZIP 244: Transaction Identifier Non-Malleability <zip-0244.rst>`_
-.. [#zip-0246] `ZIP 246: Digests for the Version 6 Transaction Format <zip-0246.rst>`_
+.. [#zip-0248] `ZIP 248: Extensible Transaction Format <zip-0248.rst>`_
 .. [#zip-0317] `ZIP 317: Proportional Transfer Fee Mechanism <zip-0317.rst>`_
 .. [#zip-0317-fee-calculation] `ZIP 317: Proportional Transfer Fee Mechanism — Fee calculation <zip-0317.rst#fee-calculation>`_
 .. [#bip-0043] `BIP 43: Purpose Field for Deterministic Wallets <https://github.com/bitcoin/bips/blob/master/bip-0043.mediawiki>`_