| """Verify the occurrence chain. Any post-hoc edit breaks every hash after it.""" |
| import hashlib, sys |
|
|
| path = sys.argv[1] if len(sys.argv) > 1 else "OCCURRENCES.hbp" |
| prev, n, bad = "0" * 64, 0, 0 |
| for ln in open(path, encoding="utf-8"): |
| ln = ln.rstrip("\n") |
| if "|event_hash=" not in ln: |
| continue |
| body, got = ln.rsplit("|event_hash=", 1) |
| want = hashlib.sha256(body.encode()).hexdigest() |
| stated_prev = body.rsplit("|prev_event_hash=", 1)[1] |
| ok = (want == got) and (stated_prev == prev) |
| if not ok: |
| bad += 1 |
| print("BREAK|row=%d|json=0" % (n + 1)) |
| prev, n = got, n + 1 |
| print("CHAIN|rows=%d|broken=%d|head=%s|json=0" % (n, bad, prev)) |
| sys.exit(1 if bad else 0) |
|
|
