Step3: Add initial Transaction V6 support to Zebra (currently copies V5 behavior)

zebra-chain/src/parameters/transaction.rs

@@ -11,3 +11,10 @@ pub const SAPLING_VERSION_GROUP_ID: u32 = 0x892F_2085;
 /// Orchard transactions must use transaction version 5 and this version
 /// group ID. Sapling transactions can use v4 or v5 transactions.
 pub const TX_V5_VERSION_GROUP_ID: u32 = 0x26A7_270A;
+
+/// The version group ID for version 6 transactions.
+///
+/// Orchard transactions must use transaction version 5 and this version
+/// group ID.
+// FIXME: use a proper value!
+pub const TX_V6_VERSION_GROUP_ID: u32 = 0x26A7_270B;

zebra-chain/src/primitives/zcash_primitives.rs

@@ -175,13 +175,16 @@ impl TryFrom<&Transaction> for zp_tx::Transaction {
     ///
     /// # Panics
     ///
-    /// If the transaction is not V5. (Currently there is no need for this
+    /// If the transaction is not V5/V6. (Currently there is no need for this
     /// conversion for other versions.)
     #[allow(clippy::unwrap_in_result)]
     fn try_from(trans: &Transaction) -> Result<Self, Self::Error> {
         let network_upgrade = match trans {
             Transaction::V5 {
                 network_upgrade, ..
+            }
+            | Transaction::V6 {
+                network_upgrade, ..
             } => network_upgrade,
             Transaction::V1 { .. }
             | Transaction::V2 { .. }