diff --git a/test-vectors/rust/zip_0244.rs b/test-vectors/rust/zip_0244.rs
index 0225db5..97e6a06 100644
--- a/test-vectors/rust/zip_0244.rs
+++ b/test-vectors/rust/zip_0244.rs
@@ -69,7 +69,7 @@
                 ],
                 transparent_input: None,
                 sighash_shielded: [
-                    0xf2, 0x89, 0x61, 0x8d, 0x7f, 0x61, 0x53, 0x29, 0x3c, 0x4e, 0x24, 0xc2, 0x76, 0xa0, 0xa1, 0x5d, 0x56, 0x2d, 0x4e, 0x6c, 0x91, 0xde, 0x3e, 0x93, 0x10, 0x4d, 0x31, 0x65, 0x4e, 0x5d, 0x71, 0xc5
+                    0x2f, 0x95, 0xe5, 0xa9, 0x5d, 0x20, 0x9e, 0x0a, 0x27, 0xd1, 0xfe, 0x66, 0x9a, 0x46, 0xf4, 0xa6, 0x44, 0xa3, 0x27, 0xd7, 0x9b, 0x84, 0x6e, 0x97, 0x92, 0x64, 0x18, 0x6a, 0xde, 0x04, 0x9b, 0xa0
                 ],
                 sighash_all: None,
                 sighash_none: None,
@@ -119,7 +119,7 @@
                 ],
                 transparent_input: None,
                 sighash_shielded: [
-                    0x6a, 0x58, 0x74, 0x54, 0xbd, 0x03, 0x12, 0x4b, 0x38, 0xe8, 0x0b, 0x46, 0xe4, 0x57, 0xcd, 0x7d, 0x5a, 0x0e, 0x8c, 0x92, 0x9b, 0x27, 0x56, 0xc1, 0xd6, 0x81, 0x7e, 0x7b, 0x53, 0xdb, 0xf3, 0x63
+                    0x83, 0xc8, 0xe3, 0x41, 0x04, 0xf1, 0x8b, 0xdb, 0xe8, 0xbb, 0xf6, 0xf0, 0xb9, 0xba, 0x53, 0xb5, 0xc6, 0x69, 0x40, 0x61, 0x0c, 0x89, 0x4b, 0xc0, 0xa8, 0x4a, 0x16, 0xdc, 0x99, 0x51, 0x24, 0x74
                 ],
                 sighash_all: None,
                 sighash_none: None,
diff --git a/zcash_test_vectors/transaction.py b/zcash_test_vectors/transaction.py
index 2d88d0c..b71a0d3 100644
--- a/zcash_test_vectors/transaction.py
+++ b/zcash_test_vectors/transaction.py
@@ -423,6 +423,10 @@ class TransactionV5(object):
     def version_bytes(self):
         return NU5_TX_VERSION | (1 << 31)
 
+    def is_coinbase(self):
+        # <https://github.com/zcash/zcash/blob/d8c818bfa507adb845e527f5beb38345c490b330/src/primitives/transaction.h#L969-L972>
+        return len(self.vin) == 1 and bytes(self.vin[0].prevout.txid) == b'\x00'*32 and self.vin[0].prevout.n == 0xFFFFFFFF
+
     # TODO: Update ZIP 225 to document endianness
     def __bytes__(self):
         ret = b''
diff --git a/zcash_test_vectors/zip_0244.py b/zcash_test_vectors/zip_0244.py
index d89740a..23fe2d5 100755
--- a/zcash_test_vectors/zip_0244.py
+++ b/zcash_test_vectors/zip_0244.py
@@ -240,9 +240,15 @@ def signature_digest(tx, t_inputs, nHashType, txin):
     return digest.digest()
 
 def transparent_sig_digest(tx, t_inputs, nHashType, txin):
-    digest = blake2b(digest_size=32, person=b'ZTxIdTranspaHash')
+    # If we are producing a hash for either a coinbase transaction, or a
+    # non-coinbase transaction that has no transparent inputs, the value of
+    # ``transparent_sig_digest`` is identical to the value specified in section
+    # T.2 <https://zips.z.cash/zip-0244#t-2-transparent-digest>.
 
-    if len(tx.vin) + len(tx.vout) > 0:
+    if tx.is_coinbase() or len(tx.vin) == 0:
+        return transparent_digest(tx)
+    else:
+        digest = blake2b(digest_size=32, person=b'ZTxIdTranspaHash')
         digest.update(hash_type(tx, nHashType, txin))
         digest.update(prevouts_sig_digest(tx, nHashType))
         digest.update(amounts_sig_digest(t_inputs, nHashType))
@@ -251,7 +257,7 @@ def transparent_sig_digest(tx, t_inputs, nHashType, txin):
         digest.update(outputs_sig_digest(tx, nHashType, txin))
         digest.update(txin_sig_digest(tx, txin))
 
-    return digest.digest()
+        return digest.digest()
 
 def hash_type(tx, nHashType, txin):
     if txin is None: