chore(ci): drop the v1 cache fallback and use library helpers in tests

.github/workflows/sanitycheck.yml

@@ -28,9 +28,7 @@ jobs:
         with:
           path: .cache/prevouts
           key: prevouts-v2-${{ hashFiles('blocks/*.bin') }}
-          restore-keys: |
-            prevouts-v2-
-            prevouts-v1-
+          restore-keys: prevouts-v2-
       - name: validate data and test validator
         run: |
           python -m venv .venv

ci/test_prevouts.py

@@ -8,7 +8,7 @@
 from unittest.mock import patch
 from urllib.error import URLError
 
-from bitcoin.core import CBlock, CBlockHeader, b2lx
+from bitcoin.core import CBlock, CBlockHeader, b2lx, lx
 from block_evidence import read_transaction, sha256d
 from prevouts import (
     PARENT_TXIDS_LIMIT, decode_parent_header, decode_parent_txids, decode_previous,
@@ -20,7 +20,7 @@
 class PrevoutChecks(unittest.TestCase):
     def setUp(self):
         self.wire, self.stripped = transaction(witness=True)
-        self.txid = sha256d(self.stripped)[::-1].hex()
+        self.txid = b2lx(sha256d(self.stripped))
         self.temp = tempfile.TemporaryDirectory()
         self.addCleanup(self.temp.cleanup)
         self.cache = Path(self.temp.name)
@@ -65,7 +65,7 @@ def test_cache_lifecycle(self, sleep):
             self.assertEqual(path.read_bytes(), self.stripped)
             self.assertEqual(len(list(self.cache.iterdir())), 1)
         with self.subTest(case="cache hit"), patch("prevouts.urlopen", side_effect=AssertionError("network on a cache hit")):
-            self.assertIn(bytes.fromhex(self.txid)[::-1], load_previous(txs, self.cache, fetch=True))
+            self.assertIn(lx(self.txid), load_previous(txs, self.cache, fetch=True))
         path.write_bytes(transaction(amount=2)[1])
         with self.subTest(case="corrupt entry"), self.assertRaisesRegex(ValueError, "identity mismatch"):
             load_previous(txs, self.cache, fetch=True)

ci/test_sanity_check.py

@@ -241,7 +241,7 @@ def test_retarget_requires_different_valid_target_at_boundary(self):
         """Retarget evidence needs a valid differing expected target at a retarget height."""
         self.record = self.for_rule("nbits_retarget_not_applied")
         original = copy.deepcopy(self.record)
-        bits = bytes.fromhex(self.record["header"])[72:76][::-1].hex()
+        bits = f"{CBlockHeader.deserialize(bytes.fromhex(self.record['header'])).nBits:08x}"
         for expected in (bits, "00000000", "1d80ffff"):
             with self.subTest(expected=expected):
                 self.record["context"]["expected_nbits"] = expected

docs/schema.md

@@ -221,7 +221,6 @@ The cache stores the header's hex response as `{prev_hash}.header`, the ordered
 Header downloads are limited to 256 bytes and txid-list downloads to 2 MiB.
 Both cached and downloaded evidence undergo the same checks; missing or corrupt evidence fails validation.
 `--fetch-prevouts` permits downloads, and a warmed cache supports offline checks.
-CI uses a `prevouts-v2-` cache prefix with older `prevouts-v1-` archives retained as a restore fallback, since the new files do not replace the existing evidence formats.
 The cache retention and scheduled-workflow limits described above also apply to these files.
 
 The checker considers only the immediate canonical parent, not older ancestors or the UTXO set, and does not execute scripts or replay historical `ConnectBlock`.