snapshot 2026-04-21T16:12:34Z

README.md

@@ -0,0 +1,53 @@
+---
+license: mit
+pretty_name: append.page ledger
+tags:
+- feedback
+- append-only
+- public-ledger
+---
+
+# appendpage/ledger
+
+Public mirror of every page on [append.page](https://append.page), pushed
+roughly every 10 minutes when any chain changes.
+
+Each file under `pages/` is the JCS-canonicalized JSONL chain of one page.
+Every entry is hash-chained to the one before it, so any later edit,
+deletion, or reorder is mathematically detectable by anyone who kept a copy
+of a prior snapshot (this dataset is one such copy — HuggingFace also
+keeps a full Git history).
+
+## Verify a page in one command
+
+```bash
+python verify.py pages/advisors.jsonl
+```
+
+Exit code `0` means the chain is intact. The verifier is ~50 lines of
+self-contained Python (stdlib + the `jcs` package for RFC 8785
+canonicalization) and ships in this repo.
+
+## Load into Python
+
+```python
+import json
+with open("pages/advisors.jsonl") as f:
+    entries = [json.loads(line) for line in f if line.strip()]
+print(len(entries), "entries")
+```
+
+## Docs
+
+- Wire format + API + verifier model: <https://append.page/AGENTS.md>
+- Machine-readable spec: <https://append.page/api/spec.json>
+
+## Source
+
+- Backend: <https://github.com/appendpage/appendpage>
+- Frontend: <https://github.com/appendpage/web>
+- License: MIT
+
+Run by [@da03](https://github.com/da03).
+
+Last auto-generated: 2026-04-21T16:12:34Z

pages/demo.jsonl

@@ -0,0 +1,12 @@
+{"body_commitment":"sha256:407ce9385b02cc8793b0efffce76d66acbbfd18d7393991bf2d1613c4d4b35ad","created_at":"2026-04-21T00:50:40.087Z","hash":"sha256:b4d051649767e415fdeb8ddf6c7b99ba41ec24efeb61c2dc8dea1d26fa12fe68","id":"01KPPR94TPZN35Q00K8J0KRDFR","kind":"entry","page":"demo","parent":null,"prev_hash":"sha256:388eda83b5499d7db206ec82f676e8faf49f39f24e4d2b45af114fbf4864f5c8","seq":0}
+{"body_commitment":"sha256:f1fcae4f73161c07cb5a5625b8db506bf01723600a127dbf4f5d08edb22943d9","created_at":"2026-04-21T00:50:41.346Z","hash":"sha256:c961865d66a7910d9d31478a94cd8fd0fc60b14616d481e2f390c24712041c4f","id":"01KPPR9621B2WHD1A4V2NR8NQ3","kind":"entry","page":"demo","parent":null,"prev_hash":"sha256:b4d051649767e415fdeb8ddf6c7b99ba41ec24efeb61c2dc8dea1d26fa12fe68","seq":1}
+{"body_commitment":"sha256:0cddd70cd16e02be64ed932fbb3286376f0845718cdeb9d0d335d63c3f7111aa","created_at":"2026-04-21T00:50:42.403Z","hash":"sha256:331cc267aa4bf91f8ba51141bc0708af823b288785b2fc1631980fbd8b791e39","id":"01KPPR9733MVEC9EE2HG46C1DT","kind":"entry","page":"demo","parent":"01KPPR9621B2WHD1A4V2NR8NQ3","prev_hash":"sha256:c961865d66a7910d9d31478a94cd8fd0fc60b14616d481e2f390c24712041c4f","seq":2}
+{"body_commitment":"sha256:4b4f5e7520dc2e582f14a073ca3a9049b3172d367c14ca7863e5950af819939c","created_at":"2026-04-21T00:50:43.451Z","hash":"sha256:82040df30d824d6578f298057b19378e5caf252a986f76133984f1e3e1b63e45","id":"01KPPR983V2E67P90W15JJ81DY","kind":"entry","page":"demo","parent":null,"prev_hash":"sha256:331cc267aa4bf91f8ba51141bc0708af823b288785b2fc1631980fbd8b791e39","seq":3}
+{"body_commitment":"sha256:f17f463b829524ae1da94ce00c402a4122da95d5180d3d2c40b33f273438f209","created_at":"2026-04-21T00:50:44.498Z","hash":"sha256:864f5df603f96732e588423fc94821e89d8d37f1ba714d0b9deaf9d3cd594fc0","id":"01KPPR994HQBERW501H7KK0M4R","kind":"entry","page":"demo","parent":null,"prev_hash":"sha256:82040df30d824d6578f298057b19378e5caf252a986f76133984f1e3e1b63e45","seq":4}
+{"body_commitment":"sha256:7d83c2ebe4d6d540da1517e3d03298eb37239720676d4220af02eb60c119fb6b","created_at":"2026-04-21T00:50:45.541Z","hash":"sha256:069946b1be061ca8532153964794202f902edf6dcc380d3c13dfca4d2d2e1dd2","id":"01KPPR9A55PFG8D5FJYT1PBDJT","kind":"entry","page":"demo","parent":null,"prev_hash":"sha256:864f5df603f96732e588423fc94821e89d8d37f1ba714d0b9deaf9d3cd594fc0","seq":5}
+{"body_commitment":"sha256:7ad01acfc600e5337d695cb92611e8928c653c97382e24f1e62f09658ad5e8b0","created_at":"2026-04-21T00:50:46.589Z","hash":"sha256:a1e60019b378d18236e9eb2594b5a0aff9cdbe70173af9456dfad142d5d8c4cf","id":"01KPPR9B5WABPN6EA9W90D7063","kind":"entry","page":"demo","parent":"01KPPR9A55PFG8D5FJYT1PBDJT","prev_hash":"sha256:069946b1be061ca8532153964794202f902edf6dcc380d3c13dfca4d2d2e1dd2","seq":6}
+{"body_commitment":"sha256:bb676356430759da4ac63537bfd677f72efc188278b33c46c86095b3e062b04e","created_at":"2026-04-21T00:50:47.664Z","hash":"sha256:7c555f7fff14668000ce9a34ad56b1844ce3304a6109de5cdfda3fa313d049cc","id":"01KPPR9C7GQV891FET300X186D","kind":"entry","page":"demo","parent":null,"prev_hash":"sha256:a1e60019b378d18236e9eb2594b5a0aff9cdbe70173af9456dfad142d5d8c4cf","seq":7}
+{"body_commitment":"sha256:56b3720d760bc65503f48147c67fac27aa4dc362d0ad45d0907c67c443230cea","created_at":"2026-04-21T00:50:48.704Z","hash":"sha256:e6927e413cf04b1e24b5f773b16020bf3abbe569f2bdb0805e9214238fd73aae","id":"01KPPR9D8081MBCPBXXNXSMDPQ","kind":"entry","page":"demo","parent":null,"prev_hash":"sha256:7c555f7fff14668000ce9a34ad56b1844ce3304a6109de5cdfda3fa313d049cc","seq":8}
+{"body_commitment":"sha256:f07e03d1eaf7fe062fdcf6b6fc38988529e66089f7870e2abd3671ceeb55043d","created_at":"2026-04-21T00:50:49.744Z","hash":"sha256:11f70232c38857efbe5f38619ca776f2eb0e32bd264ecfd40b3207f39cb5723c","id":"01KPPR9E8FMJ1G4XTPW2QNQDR7","kind":"entry","page":"demo","parent":null,"prev_hash":"sha256:e6927e413cf04b1e24b5f773b16020bf3abbe569f2bdb0805e9214238fd73aae","seq":9}
+{"body_commitment":"sha256:2ec6808f260b277e831654cd59f03d0fc0f4412397d12eb8e50ebf1f80377f62","created_at":"2026-04-21T00:50:50.785Z","hash":"sha256:7485dcd630f13b7f5975be8934047799d4350a94a2deab2911d87a746f9aef6c","id":"01KPPR9F91JF4Q414MWZCJSHT7","kind":"entry","page":"demo","parent":null,"prev_hash":"sha256:11f70232c38857efbe5f38619ca776f2eb0e32bd264ecfd40b3207f39cb5723c","seq":10}
+{"body_commitment":"sha256:3924afae69ad4e1a8226275b00f682315729e999924d249aae5fe3fab967af66","created_at":"2026-04-21T15:19:43.121Z","hash":"sha256:9efbe1993215b5c2444ee025d9dbab955212456b7ba38fd185eb6abe664c775e","id":"01KPRA0DRHDC9YAPCWA0XDYTPW","kind":"entry","page":"demo","parent":null,"prev_hash":"sha256:7485dcd630f13b7f5975be8934047799d4350a94a2deab2911d87a746f9aef6c","seq":11}

pages/launchtest.jsonl

@@ -0,0 +1,30 @@
+{"body_commitment":"sha256:06d70f371baeb46aa87b27cbfb987988dce8ae8dba3f6906678002b582619d8d","created_at":"2026-04-21T00:31:45.201Z","hash":"sha256:e98c2fbf86a4f36006652df42c67016092fe18c11d31534ec0bbc196fde4214b","id":"01KPPQ6GHH17ZQZY1KD6N5A6Y8","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:83f83a219134679ce251bf25ac5866e17f4a6387914090b60a83c8ab3ce31ab3","seq":0}
+{"body_commitment":"sha256:e812e31d7456d5440e0305cfcb7d12c8f6e4839e6566fe6f788a188c5dd9b1ed","created_at":"2026-04-21T00:31:45.865Z","hash":"sha256:fe7749af38bb79ea11f8cae54f5ef7de7f48d9752abb5c3a4b5114f305747e1e","id":"01KPPQ6H697W7G155H15C9XEGC","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:e98c2fbf86a4f36006652df42c67016092fe18c11d31534ec0bbc196fde4214b","seq":1}
+{"body_commitment":"sha256:08a596f667757acadaae180eb7082f02958c33e029db973ef8f3eb50dd1cc43d","created_at":"2026-04-21T00:31:46.505Z","hash":"sha256:241dda46749699322785b25cf2b5c2498c56742bc52747acba6e745120198fb9","id":"01KPPQ6HT9XP6FMY4GV0MR880F","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:fe7749af38bb79ea11f8cae54f5ef7de7f48d9752abb5c3a4b5114f305747e1e","seq":2}
+{"body_commitment":"sha256:f031de017a8d1614ceb44f1ac0ea7b4200dc39ecc30ad9edb5800cb08605d377","created_at":"2026-04-21T00:31:47.157Z","hash":"sha256:0dced3cc76fb739db9a3d3065d67fec36fa37638cad444e490fe1f7073a26037","id":"01KPPQ6JENDPXCJRXQMRJV6V9R","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:241dda46749699322785b25cf2b5c2498c56742bc52747acba6e745120198fb9","seq":3}
+{"body_commitment":"sha256:543c8491e238403729de24bd699fda29aebf7e864bcd52bb469457080bbf6d7a","created_at":"2026-04-21T00:31:47.841Z","hash":"sha256:c9bf8d8bd072862981125761db8fe42ea57dfb208b43a73819518df2f99b8d4e","id":"01KPPQ6K40B1PWH4F0NQA675TZ","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:0dced3cc76fb739db9a3d3065d67fec36fa37638cad444e490fe1f7073a26037","seq":4}
+{"body_commitment":"sha256:63a923b902881de0e89e315905c7d7796ee3947903b94338d70fa75945f4085f","created_at":"2026-04-21T00:31:48.579Z","hash":"sha256:ea20ba312e6619dab83a196e63994a4f1738e55e7d40c0d0d140378f3a66d044","id":"01KPPQ6KV3FT7638GBWGTY63WX","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:c9bf8d8bd072862981125761db8fe42ea57dfb208b43a73819518df2f99b8d4e","seq":5}
+{"body_commitment":"sha256:fdaef38f96d4b9fa746e8c219cec6cd03e67bce76f1e63d9f8d38c42005e706a","created_at":"2026-04-21T00:31:49.286Z","hash":"sha256:4e074c4ccb9009eb6f9003d6ebac0af54c668761b50213867a75a99663eb3b95","id":"01KPPQ6MH6ZYE5CSRZR6X4KP8K","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:ea20ba312e6619dab83a196e63994a4f1738e55e7d40c0d0d140378f3a66d044","seq":6}
+{"body_commitment":"sha256:36225b7a070b7ce38ba34b79a8834c423906db41b15522353985d8c63ddc41c7","created_at":"2026-04-21T00:31:49.946Z","hash":"sha256:94a9d1e4601ca081f0bf09776735b4120f43b352568b025cfebfac737914f5db","id":"01KPPQ6N5TNRKHTGNM50PXNAAV","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:4e074c4ccb9009eb6f9003d6ebac0af54c668761b50213867a75a99663eb3b95","seq":7}
+{"body_commitment":"sha256:759434fdeafd0d26a99950e4be29a9ed2ba517efd5aeb4718d689d1f62d881ae","created_at":"2026-04-21T00:31:50.708Z","hash":"sha256:68ec1cd73b257573ffc8715cce1083f1995ca2dc20e528be4b0ce91ad4ffeb05","id":"01KPPQ6NXM3VS46YX0C3SGBEX8","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:94a9d1e4601ca081f0bf09776735b4120f43b352568b025cfebfac737914f5db","seq":8}
+{"body_commitment":"sha256:442902b89de44d007c905490bb82930088cd28eb93948fbf0b5b23b64eb9def4","created_at":"2026-04-21T00:31:51.369Z","hash":"sha256:96f5eb9227c34bc7303c6cbacedff4881836eac2cbbb2a1ff2bcade1c0bbdd84","id":"01KPPQ6PJ9WZ282QY6WQQKARQ7","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:68ec1cd73b257573ffc8715cce1083f1995ca2dc20e528be4b0ce91ad4ffeb05","seq":9}
+{"body_commitment":"sha256:75fffc9928b2d37b37a0a483ad80156227aa773c5398a0ce278ab3f00ff7e33c","created_at":"2026-04-21T00:31:52.038Z","hash":"sha256:2a601b93a104090142cfb3d4d1e88eec568780e43017071adbb8ff1c4c07b891","id":"01KPPQ6Q753GX9JB09EWBWCZ5K","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:96f5eb9227c34bc7303c6cbacedff4881836eac2cbbb2a1ff2bcade1c0bbdd84","seq":10}
+{"body_commitment":"sha256:ecf62a04c87bfcde11061f883ed01c4afe48d6b1ee7118a9c2c28d47f134656f","created_at":"2026-04-21T00:31:52.794Z","hash":"sha256:7d620998d8fc05aca1788e570701e92cb135763322fb380af2e185cad431d05b","id":"01KPPQ6QYTSRBG8230KRMGBGDP","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:2a601b93a104090142cfb3d4d1e88eec568780e43017071adbb8ff1c4c07b891","seq":11}
+{"body_commitment":"sha256:7f0ddff7e72ca9c21576629ac2a0191f5b217dc5a6ed0ab35614420410042777","created_at":"2026-04-21T00:31:53.447Z","hash":"sha256:62b47118b7be5398e030dd2ced1865de0f541ee95d03b2128b2e3fa4f7ecf7f9","id":"01KPPQ6RK7GW9TPYT0MV4Y0WWD","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:7d620998d8fc05aca1788e570701e92cb135763322fb380af2e185cad431d05b","seq":12}
+{"body_commitment":"sha256:a9638b2daae41f9009fc1e54b21c945613855ee65c5d905ba1837c1f2b55a06f","created_at":"2026-04-21T00:31:54.121Z","hash":"sha256:d45bcca89897fbfdd240b1d3154155a1886b5fbeb17dad18ecc2f55f64f74c87","id":"01KPPQ6S887B64N3FYXFJKNXC0","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:62b47118b7be5398e030dd2ced1865de0f541ee95d03b2128b2e3fa4f7ecf7f9","seq":13}
+{"body_commitment":"sha256:b2275a987e9a7a975846ac04c13a812a235684b73b2d9c29b0d97b8003972eed","created_at":"2026-04-21T00:31:54.761Z","hash":"sha256:676a61288ab5673059027e382a07b41f4f82ca92516fb91a4e52a3813586bcb7","id":"01KPPQ6SW9NYPP7SCCRX760SBV","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:d45bcca89897fbfdd240b1d3154155a1886b5fbeb17dad18ecc2f55f64f74c87","seq":14}
+{"body_commitment":"sha256:b6a15b4444a0c3a3a5899e2244be5371cd281ba72a2fa46066d576e1215873e9","created_at":"2026-04-21T00:31:55.427Z","hash":"sha256:6efe1a343bd6d680a24854fd4310b1be2caaadc9724fcb14a9f0fa2224541543","id":"01KPPQ6TH31HGZZ783KE9XJ0SB","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:676a61288ab5673059027e382a07b41f4f82ca92516fb91a4e52a3813586bcb7","seq":15}
+{"body_commitment":"sha256:81a0391dc11fc0c978735b3825e4fe17c24fc1fb295169d61f15502ee0f2e7ce","created_at":"2026-04-21T00:31:56.079Z","hash":"sha256:9d75efd30316bf314b72422e07ac93621846df9228be69558442a53c67e236aa","id":"01KPPQ6V5F6BXMW7B4GD9W2ZVX","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:6efe1a343bd6d680a24854fd4310b1be2caaadc9724fcb14a9f0fa2224541543","seq":16}
+{"body_commitment":"sha256:fa4db56213e1316d5583d932cd3d855802a464f4582e5d9a178486aad8a04de6","created_at":"2026-04-21T00:31:56.745Z","hash":"sha256:e6e37fe976b40c722cd55d166f2d7485ecae1380b5eb585d0b19637ca8293e05","id":"01KPPQ6VT8RZZY2TF6E4S0EY8N","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:9d75efd30316bf314b72422e07ac93621846df9228be69558442a53c67e236aa","seq":17}
+{"body_commitment":"sha256:ddb0323885205a933f20b6d2743252a53d829761dabd5c3dddfcfe99f0996a5d","created_at":"2026-04-21T00:31:57.438Z","hash":"sha256:029e84e732806572f069a0a4cfb24c7ef99811d61f7295e24fdb5b8b52c6cd00","id":"01KPPQ6WFYY9E7NHA8MDEZ26Q5","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:e6e37fe976b40c722cd55d166f2d7485ecae1380b5eb585d0b19637ca8293e05","seq":18}
+{"body_commitment":"sha256:607b72746be639fbce6fdf0276b608b8379b550ecfa8bc438a94ce127f5ac8ad","created_at":"2026-04-21T00:31:58.113Z","hash":"sha256:e27712402cb9cd147f130d27332e31acd8a232b438091dbf2d32f66d4339e0dc","id":"01KPPQ6X50VRN83B9YRESEYZKV","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:029e84e732806572f069a0a4cfb24c7ef99811d61f7295e24fdb5b8b52c6cd00","seq":19}
+{"body_commitment":"sha256:e303a270a740dff2e906536d128b3b2bcebce24a34d5a77b4fe4c5d44eef6522","created_at":"2026-04-21T00:31:58.831Z","hash":"sha256:7fc5eba149caea84abbca17c7f772a9700692f08f295054389529fb20c229ba8","id":"01KPPQ6XVEMZ5XBDS6J8JT2KMH","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:e27712402cb9cd147f130d27332e31acd8a232b438091dbf2d32f66d4339e0dc","seq":20}
+{"body_commitment":"sha256:7dd0bdeb440c4e0c1c3e67f6854cafe87828de3282a31e9db542e4095fd4f672","created_at":"2026-04-21T00:31:59.505Z","hash":"sha256:a3a0cbf11a1d4fbb2e3c8b70dfb6f7c9ec707370f5281223862e5714c87e3a22","id":"01KPPQ6YGHXPZD0SSS7HC7CJDY","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:7fc5eba149caea84abbca17c7f772a9700692f08f295054389529fb20c229ba8","seq":21}
+{"body_commitment":"sha256:87345b7df10039e30d8d848ade8f24df5f6bdf03bf0b8bb41640b0364b015c10","created_at":"2026-04-21T00:32:00.165Z","hash":"sha256:72b897e89bdd1b9e559ae5fc6715982b21da809058c22ef7dc2f170acc4cf682","id":"01KPPQ6Z554RQK7QJ0ZPPJ8RF7","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:a3a0cbf11a1d4fbb2e3c8b70dfb6f7c9ec707370f5281223862e5714c87e3a22","seq":22}
+{"body_commitment":"sha256:e7456fee1d250747f9f2360b1e3e6e9b42a0e64983ed9c4900c401ff74cd3a14","created_at":"2026-04-21T00:32:00.927Z","hash":"sha256:a29c50ca7adca6a2a49318647fa9d82b10b721340dcc15fd7ae156852a741118","id":"01KPPQ6ZWYJ1H9KM3HKSZ6BCH1","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:72b897e89bdd1b9e559ae5fc6715982b21da809058c22ef7dc2f170acc4cf682","seq":23}
+{"body_commitment":"sha256:083f90e7bc44e80f98297208a740d8ea81da57e68f630186cb2a357ba27266ec","created_at":"2026-04-21T00:32:01.578Z","hash":"sha256:606eea7d9932ad2a6de335907cdd13e3a2ddd8d0c73c6f91bbf6668447b0fee4","id":"01KPPQ70HA8JVMKZ20PXH9885Y","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:a29c50ca7adca6a2a49318647fa9d82b10b721340dcc15fd7ae156852a741118","seq":24}
+{"body_commitment":"sha256:30b5f8120fad84a53001a8ad71f9188fabe87ea084336e23b5988086ae1d1e2a","created_at":"2026-04-21T00:32:02.262Z","hash":"sha256:a838637a6c3cf0463a91906ec280683e94bc33f7e8283e201ff8983b28568418","id":"01KPPQ716PPS8KKPBBRRQQM9H7","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:606eea7d9932ad2a6de335907cdd13e3a2ddd8d0c73c6f91bbf6668447b0fee4","seq":25}
+{"body_commitment":"sha256:0f9330dc62cd52be97eb87c871642a485f31589499e117580b6153c6a1aebbfa","created_at":"2026-04-21T00:32:02.918Z","hash":"sha256:44dd94a7b64d6b3e3cf2f5dc0ebdffe9b8ee7373c06408c67fd3c0854111cd67","id":"01KPPQ71V6HPSW5BMKXKJPET9H","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:a838637a6c3cf0463a91906ec280683e94bc33f7e8283e201ff8983b28568418","seq":26}
+{"body_commitment":"sha256:4b2864bab6820078a1c84aa551d22ef7df4998dab49bb2beda218628a59de57b","created_at":"2026-04-21T00:32:03.664Z","hash":"sha256:9dc91255b8891668f650f507c80789d8e55176d34b65795583c0a86882a68f31","id":"01KPPQ72JFW7QVWX1Z8XBDCPHA","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:44dd94a7b64d6b3e3cf2f5dc0ebdffe9b8ee7373c06408c67fd3c0854111cd67","seq":27}
+{"body_commitment":"sha256:e43cdcc41578784a09d357e97c9f0e7bcea3a2a328a7e9bed72ec6bc9a180585","created_at":"2026-04-21T00:32:04.331Z","hash":"sha256:4ba742e82e937083971aa9011008018af18dbece5a13ebbeda069a5c6eb077d4","id":"01KPPQ737BTX6FEAR8HXNPKVME","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:9dc91255b8891668f650f507c80789d8e55176d34b65795583c0a86882a68f31","seq":28}
+{"body_commitment":"sha256:0decd26ee1859a5e7b0581e6d6fab0298ce8f54e295ad5f09a17c22142f922cd","created_at":"2026-04-21T00:32:04.999Z","hash":"sha256:c372295314a5cdb910843fa0af579dcab0ed544136fe56230e1de426bb504110","id":"01KPPQ73W7EV6GCBDGYZEYKW7C","kind":"entry","page":"launchtest","parent":null,"prev_hash":"sha256:4ba742e82e937083971aa9011008018af18dbece5a13ebbeda069a5c6eb077d4","seq":29}

pages/smoketest.jsonl

@@ -0,0 +1,30 @@
+{"body_commitment":"sha256:e4c1d27e2a140ebd1e9e026be4e8bdcff161e2806843e50f0639d0014f6b5c7f","created_at":"2026-04-21T00:27:39.434Z","hash":"sha256:c4261c847f1a0debbc8b290973fc289f66c000f71128dd68d46371c6322223a9","id":"01KPPPZ0H90FY2TE2AR7GCB2EE","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:f8c9adadebe49d78cf5557feeca5e6a4a10d678da5f72af93d9c1da16caebea0","seq":0}
+{"body_commitment":"sha256:694ed29ffd0b0f80127b99a26c10c76abb9bfc752cb369b9453661511778b80e","created_at":"2026-04-21T00:27:40.069Z","hash":"sha256:fdffb73f626621cbef16b7cce0ece2b0f58e55ee3c7946716cdf394ab5b65f13","id":"01KPPPZ155FYJJVZDJAGSKYMTS","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:c4261c847f1a0debbc8b290973fc289f66c000f71128dd68d46371c6322223a9","seq":1}
+{"body_commitment":"sha256:81931e14c5d3bca3d876049dffe71395ccfe485d8e4af0246bbf485d120d898f","created_at":"2026-04-21T00:27:40.895Z","hash":"sha256:99c934c7badb366dd38408579894d43102b6cd0f53b2faa761314541a83ff549","id":"01KPPPZ1YY0MZAC0G2AA2CCHNG","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:fdffb73f626621cbef16b7cce0ece2b0f58e55ee3c7946716cdf394ab5b65f13","seq":2}
+{"body_commitment":"sha256:a7a844b148e8d8a93f496ceb4bd9cd4633aa176b34005bfc61f29c25e796622e","created_at":"2026-04-21T00:27:41.512Z","hash":"sha256:ebaeb1c9f3f5cb42ed7d4b7b08478429f947ca8029cc4843ed225a3fb92ff2d9","id":"01KPPPZ2J86NRSCKVSBAY2BD62","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:99c934c7badb366dd38408579894d43102b6cd0f53b2faa761314541a83ff549","seq":3}
+{"body_commitment":"sha256:f7208eb1517f2cfcbbde2343fba2360b69213c6e4b62ec5c8fb0b1cd28064182","created_at":"2026-04-21T00:27:42.283Z","hash":"sha256:02c14e5f711a647871cf4f1092f096b5ae8adb5734d479cdd6cc1f1017d33dbc","id":"01KPPPZ3ABNN1QQTY0J63TRZYV","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:ebaeb1c9f3f5cb42ed7d4b7b08478429f947ca8029cc4843ed225a3fb92ff2d9","seq":4}
+{"body_commitment":"sha256:edf07bfe76ae10006bd20106eba4d3a24e619e9c362f958a4647c8243b3b5e87","created_at":"2026-04-21T00:27:43.102Z","hash":"sha256:4f935ef312fa2f22cf8d9c67f691fc5288608aa8ef6e05d528dada1e8743c020","id":"01KPPPZ43Y6SDTMWMR8J7M26JR","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:02c14e5f711a647871cf4f1092f096b5ae8adb5734d479cdd6cc1f1017d33dbc","seq":5}
+{"body_commitment":"sha256:4af44aff024ea260b79a165f9de38d46dc1ea800c23727c4aa33164f58940792","created_at":"2026-04-21T00:27:43.763Z","hash":"sha256:152d8645f4cbb419bf269cfe8b93a98da2891fbc1538d9842f689cac1102aed7","id":"01KPPPZ4RK9J59EP64EB6NA7DE","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:4f935ef312fa2f22cf8d9c67f691fc5288608aa8ef6e05d528dada1e8743c020","seq":6}
+{"body_commitment":"sha256:23a267cace7f30b87ddbdd35466c5b1e6698e135b32982b76a9458bf501b4d86","created_at":"2026-04-21T00:27:44.360Z","hash":"sha256:5435725bcb4224a10b4a5c4cf3ab2773fd2405ba1b1d0e8292cc3aa3de4907a1","id":"01KPPPZ5B8P1M7P9FTEX1475BD","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:152d8645f4cbb419bf269cfe8b93a98da2891fbc1538d9842f689cac1102aed7","seq":7}
+{"body_commitment":"sha256:5ebbb0e5cb93d51cacb80c4e6dc38584217933ca31ec1ca9274a96bd6a546418","created_at":"2026-04-21T00:27:45.073Z","hash":"sha256:877b7997ec66244969399496cd36bc36dfb8d2d8d8f6fc46e725f5f0eaeeeafa","id":"01KPPPZ61GKM1KSXC8NH60NHHK","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:5435725bcb4224a10b4a5c4cf3ab2773fd2405ba1b1d0e8292cc3aa3de4907a1","seq":8}
+{"body_commitment":"sha256:b897e872315e5f411c3a87bcd1300479c4942c169c426b99b100b34d529a5a99","created_at":"2026-04-21T00:27:45.728Z","hash":"sha256:1c0721dc13ce5a25d99836a52e50e9f41e492e228e529330dbf4a301d007ce95","id":"01KPPPZ6P0EWBD14KSGTSJRKVJ","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:877b7997ec66244969399496cd36bc36dfb8d2d8d8f6fc46e725f5f0eaeeeafa","seq":9}
+{"body_commitment":"sha256:384418a67528f48576ef8c9f088c93e87741f40089166b35273426d7077828c4","created_at":"2026-04-21T00:27:46.355Z","hash":"sha256:58cceb7fdbba0704273af717d9ff5668475c94dd2422bd4d1fde86ff739f50ec","id":"01KPPPZ79K5Y90Y8QSGRXNDMH6","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:1c0721dc13ce5a25d99836a52e50e9f41e492e228e529330dbf4a301d007ce95","seq":10}
+{"body_commitment":"sha256:762a97f05ded4b007b0e0d047867b04f849bf251cd291270547467dc7713aac4","created_at":"2026-04-21T00:27:46.957Z","hash":"sha256:6693bb9199bc1347bdc53e3ad5b2f4c88140619f9be8502b6f6a6852f15905a6","id":"01KPPPZ7WCPV5P4TDDR0PYJ3EX","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:58cceb7fdbba0704273af717d9ff5668475c94dd2422bd4d1fde86ff739f50ec","seq":11}
+{"body_commitment":"sha256:f4dfaded1b340ec927b424c1e059a8d05240d4c195dadd95b38d562c48495429","created_at":"2026-04-21T00:27:47.691Z","hash":"sha256:b2ee26f5a6c6a7d207ad13c1948f0a51fa500b43bb83d67726de86425a349fd4","id":"01KPPPZ8KBE0PH6WP3T4E8MFP2","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:6693bb9199bc1347bdc53e3ad5b2f4c88140619f9be8502b6f6a6852f15905a6","seq":12}
+{"body_commitment":"sha256:5e0ae8cf9c22b1d680025dc7912164879b1e84b25b3d7ea796e594772855e944","created_at":"2026-04-21T00:27:48.351Z","hash":"sha256:b475e8c69680c41769b9865db46596b365fe14de7f74552763dca3209df6bae2","id":"01KPPPZ97YGB8AH190AVCHX63V","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:b2ee26f5a6c6a7d207ad13c1948f0a51fa500b43bb83d67726de86425a349fd4","seq":13}
+{"body_commitment":"sha256:f6485f631ec44587dbe8c26e4e0fd953f48714ca7d03e31a7c40b1f918f5847f","created_at":"2026-04-21T00:27:48.995Z","hash":"sha256:b5cfed11cbea0b0ecdd3cdadd6b739b57c430519b5fd7360aa88c2df701b28a4","id":"01KPPPZ9W3B5QQF47G80R4Q2G3","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:b475e8c69680c41769b9865db46596b365fe14de7f74552763dca3209df6bae2","seq":14}
+{"body_commitment":"sha256:5d0823a50ada889d755a8be3660c9ae5837a02e872cf93f1c545a7fff55f09ed","created_at":"2026-04-21T00:27:49.619Z","hash":"sha256:465f24ffbae2c400fe0ff1ef13865deb37eecd8c10eb13bb19548b36f13f1ac6","id":"01KPPPZAFKASSJ5PV2XS1BVV6P","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:b5cfed11cbea0b0ecdd3cdadd6b739b57c430519b5fd7360aa88c2df701b28a4","seq":15}
+{"body_commitment":"sha256:cc92f20de96954e7b5a4f66a8f2ebc61b7ade84862d2863151408eeb874b83af","created_at":"2026-04-21T00:27:50.308Z","hash":"sha256:0f63f0f3e8e725bc66a428838a26e0c1d5c4da88d4aa333a29076ca0c2c55697","id":"01KPPPZB545K9ZHKDG8TYYK3CR","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:465f24ffbae2c400fe0ff1ef13865deb37eecd8c10eb13bb19548b36f13f1ac6","seq":16}
+{"body_commitment":"sha256:207a9c8eb8654e46309c58cd453c3ec00a0118498eeecbf5888f65056ecbab5a","created_at":"2026-04-21T00:27:50.999Z","hash":"sha256:c2c3bdff4c507ffb14e92c958b85f06d25197d9d9dd6488176de66e9ec1e7d82","id":"01KPPPZBTQCNB9VJFHK4RMQC29","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:0f63f0f3e8e725bc66a428838a26e0c1d5c4da88d4aa333a29076ca0c2c55697","seq":17}
+{"body_commitment":"sha256:88eeef9f57141de38f40537b96e04bb0dd53e7880dc3d72c17b117afa04683e8","created_at":"2026-04-21T00:27:51.608Z","hash":"sha256:bd36160c3a2a1740a64651db57dddfb070b807145847f06960710495b4267f92","id":"01KPPPZCDRR7CSCC731D8P9JTQ","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:c2c3bdff4c507ffb14e92c958b85f06d25197d9d9dd6488176de66e9ec1e7d82","seq":18}
+{"body_commitment":"sha256:f738b73d2c716e36d6b2e4dded8ba9cbd45bf584326bf868c8584cd5ab273aef","created_at":"2026-04-21T00:27:52.231Z","hash":"sha256:2130309ef0b2770fbb78bca5437d3b57cff41f20185feeddde59751f58fbdfd8","id":"01KPPPZD17B4QEK0KSFTGRBBBC","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:bd36160c3a2a1740a64651db57dddfb070b807145847f06960710495b4267f92","seq":19}
+{"body_commitment":"sha256:707ba8d2efe79810c55e869fb3b358c395144d4886c4b9c0fb0827171e72204b","created_at":"2026-04-21T00:27:52.936Z","hash":"sha256:5eacc348525a78ef3f5d872e8d8717deb63cd09631ccb7549e3b1f086fdcf5c8","id":"01KPPPZDQ8AF0CGW5QSFSMK995","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:2130309ef0b2770fbb78bca5437d3b57cff41f20185feeddde59751f58fbdfd8","seq":20}
+{"body_commitment":"sha256:6ca89e55df8a920fc1264309eecd0b931536b50ac649be89d3fd151cefdad37b","created_at":"2026-04-21T00:27:53.583Z","hash":"sha256:ed50096f6ff39da253f7931e27f1c4bea8ce381122053dab2bf00dd9a260e806","id":"01KPPPZEBF6547KYQRYJ8XR6YK","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:5eacc348525a78ef3f5d872e8d8717deb63cd09631ccb7549e3b1f086fdcf5c8","seq":21}
+{"body_commitment":"sha256:0ea54e68a480c6bcef00e34e3c015048e222e1a3abfe0d7988fa67eaaf566f0c","created_at":"2026-04-21T00:27:54.254Z","hash":"sha256:1b8f413dcad2132f66686357b9de1c83cf7ab9a79fa2cb0e6122b303e9a5b94d","id":"01KPPPZF0E0BGEA5SJS6MKFW7V","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:ed50096f6ff39da253f7931e27f1c4bea8ce381122053dab2bf00dd9a260e806","seq":22}
+{"body_commitment":"sha256:8653a0518bc6c5ca76c5e1e572a73f467fbc9dcfb01b3436d74a38b59bc8ac35","created_at":"2026-04-21T00:27:54.856Z","hash":"sha256:6608804b2b4a79a5e157fef07221717e0a6958fb7d6f51b3d52a6a4f4dc24060","id":"01KPPPZFK7D6H6CRRCCV799CQ6","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:1b8f413dcad2132f66686357b9de1c83cf7ab9a79fa2cb0e6122b303e9a5b94d","seq":23}
+{"body_commitment":"sha256:29c09135b1d1a598d6e9bd5c48c0fe1233dd14adaa31b871cf49a757e0dc9f1d","created_at":"2026-04-21T00:27:55.559Z","hash":"sha256:250e998d874723a09dd4bb3768ae10bc00441129d11ba55bc6353fa1bec0af01","id":"01KPPPZG97031M4H1P03650NH3","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:6608804b2b4a79a5e157fef07221717e0a6958fb7d6f51b3d52a6a4f4dc24060","seq":24}
+{"body_commitment":"sha256:79713efda599bab1e641f5835dd80a2ad4c2e2ebe1920467a4ae3c47e779508b","created_at":"2026-04-21T00:27:56.207Z","hash":"sha256:6907f6c980102aafc565b1f7e986acbe99430fa94e3d87793498e7103b24d1e8","id":"01KPPPZGXFVZ2N6DT2SMQYCZGQ","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:250e998d874723a09dd4bb3768ae10bc00441129d11ba55bc6353fa1bec0af01","seq":25}
+{"body_commitment":"sha256:316cf4de42498c66f5eccdcde344c397b3844d86b9f5ab0ff31a571e80288a49","created_at":"2026-04-21T00:27:56.862Z","hash":"sha256:ad3b8bca2863223568afff95f09ef679c7ea161da4c0a5ea24ff3d541591342a","id":"01KPPPZHHY479RNQQ88R88YY8Q","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:6907f6c980102aafc565b1f7e986acbe99430fa94e3d87793498e7103b24d1e8","seq":26}
+{"body_commitment":"sha256:1d888383a6dbc31dd51e0751cfa54d6555370920ff455e10dc89608e982f10b2","created_at":"2026-04-21T00:27:57.828Z","hash":"sha256:c8bed10df800f02bdafb108629e3ad1c0f6f8374e9e90e7186c135764233863e","id":"01KPPPZJG3T9TS8V6HMHFYQ2TQ","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:ad3b8bca2863223568afff95f09ef679c7ea161da4c0a5ea24ff3d541591342a","seq":27}
+{"body_commitment":"sha256:8431bfe38030733c68014886fb67e0bd62a8becff07f2c3f5164fe245f2d40c5","created_at":"2026-04-21T00:27:58.446Z","hash":"sha256:319357128493055b06d6c2ee0819e1586fbb304bfe2419918fb9bf468f6b79d4","id":"01KPPPZK3EB0B1BMPWH07FW515","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:c8bed10df800f02bdafb108629e3ad1c0f6f8374e9e90e7186c135764233863e","seq":28}
+{"body_commitment":"sha256:2dd40e2bed02df73d279e8a5a8c97900558596c767a4ae9dc43f6aa0ceadac55","created_at":"2026-04-21T00:27:59.065Z","hash":"sha256:2963a8725cb82591b50937cfc1bfdce89e8112f3b85bae2d8aef17469d20748d","id":"01KPPPZKPSWAFAC1E4TK1WG2Q8","kind":"entry","page":"smoketest","parent":null,"prev_hash":"sha256:319357128493055b06d6c2ee0819e1586fbb304bfe2419918fb9bf468f6b79d4","seq":29}

verify.py

@@ -0,0 +1,180 @@
+#!/usr/bin/env python3
+"""
+verify.py - standalone chain verifier for append.page
+
+Usage:
+    python verify.py path/to/page.jsonl
+    curl -sS https://append.page/p/<slug>/raw | python verify.py /dev/stdin
+    python verify.py path/to/page.jsonl --with-bodies path/to/bodies.json
+
+Exit codes:
+    0  chain is intact
+    1  chain is broken (failure details on stderr)
+    2  usage error
+
+What it checks:
+    1. Each entry's `hash` matches SHA-256(JCS-canonical(entry_minus_hash)).
+    2. Each entry's `prev_hash` matches the previous entry's `hash`.
+    3. The first entry's `prev_hash` matches SHA-256("genesis|<slug>|<page_created_at>").
+       (The genesis seed only depends on the slug + page creation timestamp; we
+       derive `page_created_at` from a "?genesis_at=<ISO8601>" hint on the URL
+       or from the first entry's metadata if available; otherwise the genesis
+       check is skipped with a note.)
+    4. With --with-bodies: each revealed (body, salt) pair hashes to the on-chain
+       body_commitment for its entry.
+
+Dependencies: stdlib only (json, hashlib, sys, argparse) + the `jcs` PyPI
+package for RFC 8785 canonicalization. Install with: pip install jcs
+(falls back to a sort_keys + compact-separators approach if jcs is missing,
+which is byte-equivalent for our entry shape since we use only string/integer
+values, no floats and no special escaping).
+"""
+import argparse
+import hashlib
+import json
+import sys
+from typing import Optional
+
+try:
+    import jcs as _jcs
+
+    def canonicalize(obj: dict) -> bytes:
+        return _jcs.canonicalize(obj)
+except ImportError:
+    # Fallback: byte-equivalent for the v0 entry shape (string + int values only).
+    # If you start using floats, install jcs.
+    def canonicalize(obj: dict) -> bytes:
+        return json.dumps(
+            obj, sort_keys=True, separators=(",", ":"), ensure_ascii=False
+        ).encode("utf-8")
+
+
+def sha256_hex(data: bytes) -> str:
+    return "sha256:" + hashlib.sha256(data).hexdigest()
+
+
+def genesis_seed(slug: str, page_created_at_iso: str) -> str:
+    return sha256_hex(f"genesis|{slug}|{page_created_at_iso}".encode("utf-8"))
+
+
+def verify_chain(
+    entries: list[dict], bodies_by_id: Optional[dict[str, dict]] = None
+) -> tuple[bool, str]:
+    if not entries:
+        return True, "empty chain (0 entries)"
+
+    page_slug = entries[0].get("page")
+    expected_prev_hash: Optional[str] = None  # set after we see entry[0]
+
+    for i, entry in enumerate(entries):
+        # 1. recompute the entry's own hash
+        recorded_hash = entry.get("hash")
+        if not recorded_hash:
+            return False, f"entry {i} (id={entry.get('id')}) has no `hash` field"
+        body = {k: v for k, v in entry.items() if k != "hash"}
+        recomputed = sha256_hex(canonicalize(body))
+        if recomputed != recorded_hash:
+            return (
+                False,
+                f"entry {i} (id={entry.get('id')}): recorded hash {recorded_hash} "
+                f"!= recomputed {recomputed}",
+            )
+
+        # 2. check prev_hash against the previous entry's hash
+        prev_hash = entry.get("prev_hash")
+        if i == 0:
+            # We can't verify the genesis seed without knowing the page's
+            # creation timestamp. Just record what we'd expect; skip enforcement
+            # unless the caller supplies it via --genesis-at.
+            pass
+        else:
+            if prev_hash != expected_prev_hash:
+                return (
+                    False,
+                    f"entry {i} (id={entry.get('id')}): prev_hash {prev_hash} "
+                    f"!= entry[{i - 1}].hash {expected_prev_hash}",
+                )
+
+        # 3. seq must increase by 1
+        seq = entry.get("seq")
+        if seq != i:
+            return False, f"entry {i}: seq={seq}, expected {i}"
+
+        # 4. page must match across the chain
+        if entry.get("page") != page_slug:
+            return False, (
+                f"entry {i}: page={entry.get('page')!r}, expected {page_slug!r} "
+                f"(mixed pages in one chain?)"
+            )
+
+        # 5. optional body verification
+        if bodies_by_id:
+            entry_id = entry.get("id")
+            if entry_id in bodies_by_id:
+                reveal = bodies_by_id[entry_id]
+                body_text = reveal.get("body")
+                salt_hex = reveal.get("salt")
+                if body_text is None or salt_hex is None:
+                    return False, (
+                        f"entry {i} (id={entry_id}): bodies file is missing "
+                        f"`body` or `salt`"
+                    )
+                salt_bytes = bytes.fromhex(salt_hex)
+                computed = sha256_hex(salt_bytes + body_text.encode("utf-8"))
+                if computed != entry.get("body_commitment"):
+                    return False, (
+                        f"entry {i} (id={entry_id}): revealed body_commitment "
+                        f"{computed} != on-chain {entry.get('body_commitment')}"
+                    )
+
+        expected_prev_hash = recorded_hash
+
+    return True, f"verified {len(entries)} entries, chain intact, head: {expected_prev_hash}"
+
+
+def main() -> int:
+    ap = argparse.ArgumentParser(description="Verify an append.page chain (JSONL).")
+    ap.add_argument("jsonl", help="path to a .jsonl file (or /dev/stdin)")
+    ap.add_argument(
+        "--with-bodies",
+        metavar="PATH",
+        help="JSON file mapping entry_id -> {body, salt} (salt as hex)",
+    )
+    ap.add_argument(
+        "--genesis-at",
+        metavar="ISO8601",
+        help="page creation timestamp; if supplied, also verifies entry[0].prev_hash "
+        "== SHA-256(\"genesis|<slug>|<ts>\")",
+    )
+    args = ap.parse_args()
+
+    with open(args.jsonl, "r", encoding="utf-8") as f:
+        entries = [json.loads(line) for line in f if line.strip()]
+
+    bodies_by_id = None
+    if args.with_bodies:
+        with open(args.with_bodies, "r", encoding="utf-8") as f:
+            bodies_by_id = json.load(f)
+
+    ok, msg = verify_chain(entries, bodies_by_id)
+    if not ok:
+        print(f"FAIL: {msg}", file=sys.stderr)
+        return 1
+
+    if args.genesis_at and entries:
+        expected = genesis_seed(entries[0]["page"], args.genesis_at)
+        if entries[0]["prev_hash"] != expected:
+            print(
+                f"FAIL: entry[0].prev_hash {entries[0]['prev_hash']} != "
+                f"genesis seed {expected} (slug={entries[0]['page']}, "
+                f"genesis_at={args.genesis_at})",
+                file=sys.stderr,
+            )
+            return 1
+
+    print(f"OK: {msg}")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())