Checkpoints of week 2026-W42

12 October 2026 – 18 October 2026 (UTC) · 8 checkpoints

A checkpoint is a signed state of the Merkle tree over the whole Sigelith proof log, chained to the previous checkpoint by the SHA-256 of its file. This page shows the exact bytes of every checkpoint issued in this week, so even a copy of it is enough to recompute each hash.

Weekly checkpoint

Number

#28

Issued

2026-10-19T00:09:50.897353Z

File SHA-256

acf84acdd577536fff98fddd21cf9e941ac5964864a35826682547e658e22d1a

Global tree

tree_size 451, root 0e58ab78c7db2869d9c55ead031b4d3880a3812de2f10fce05c4f2200cb90cf1

Last entry

seq 451, chain hash f989ddf859dd502613c49bb7996017b8d1b3e2b1a317713af069fad5ba8ae8d0

Bitcoin block

972077 00000000000000000001e66b29883257a8cde5fbfe049ce13f8ec3a34574e217

Previous checkpoint

efeb5a3c7892b1d05573d8256c1c4b7513ff64aa6a956604f09d636fb1b599f1

Week entries

88

Weekly Merkle root

276ed25ad72c37ebfccb0ed176de6e86cd9f7273d54b2579195de73840cef391

Weekly dump

2026-W42.jsonl, SHA-256 316bbac61ea52cc00e0f19ca380c9ab6f22087392e09c1c4a8358925f50c52ba

Signing key

e7y9THJIUKvNKOZHmdBjJ8E0bOKyBFVxxMpAJ8w574Y= — compare with the key history

Bank anchors recorded in this checkpoint

Confirmed bank transfers added since the previous weekly checkpoint. Each title reproduces a weekly Merkle root.

All checkpoints of this week

Anchors and independent copies

Every checkpoint is sealed by parties that depend neither on each other nor on us.

Ed25519 signature

Every file is signed. Check the key against the key history.

Bitcoin block in the file

Not earlier than. Each checkpoint names a Bitcoin block on which two independent sources agree, so it cannot have been written before that block was mined.

OpenTimestamps

Not later than. The SHA-256 of every file is committed to Bitcoin: 8 of 8 proofs of this week already in a block.

Bank transfer

Each weekly Merkle root is anchored by a bank transfer titled MROOT with the root; every weekly checkpoint records the transfers booked since the previous one; this week's weekly checkpoint records 1. All bank anchors.

GitHub

Immutable release 2026-W42 in DeiFlagellum/sigelith-log.

Internet Archive

Snapshot of this page and of the weekly checkpoint file.

Zenodo

Every quarter a complete snapshot of the log — every checkpoint and every weekly dump — is deposited in Zenodo (CERN) with a permanent DOI; latest version: 2026-Q3.

Public log

Every entry can be downloaded (entries, weekly dumps), so anyone can recompute every root and check every signature.

How to verify

1. Take the checkpoint file from an independent copy, not from us.
2. Check the Ed25519 signature: the message is beattime-checkpoint-v1| followed by the file's JSON without sig, in canonical form (RFC 8785); the key is in key. The format identifier keeps the log's original name — see the naming history.
3. Check the chain: the SHA-256 of each file equals prev of the next one.
4. Check the time: ots verify 000021.json.ots — Bitcoin attests that the file existed.
5. Download the log (entries or weekly dumps) and recompute root over the first tree_size entries (RFC 9162 Merkle tree).

Exact formats and the full procedure: README of DeiFlagellum/sigelith-log and the proof specification.

Exact files

000021.json

{"btc":{"hash":"0000000000000000000042601b4858534f518c3fc526a6f1544a728d92f8ead4","height":971005},"format":"beattime-checkpoint-v1","key":"e7y9THJIUKvNKOZHmdBjJ8E0bOKyBFVxxMpAJ8w574Y=","kind":"daily","last_chain_hash":"d804fe2043c8204e0f67cb7ee8f75b3d4ceca87d58801b9c2cdaa7f3ffdfe506","last_seq":363,"n":21,"prev":"df810c931f9a329670cca291804eb9a7d9c4e3428bacb85ff93156f253790d83","root":"ff798dc5fb44cb5f02184c3b46f0dcbbe4b6346a92092245e640fbc77b12b556","sig":"4klWdUNJSNVeo/rGS4I7ELlLJ1EsybWHT7x0DhhObnIXvCORDNPefiEEBK0YLI9+56UGcuHj6o3VCasNM5QrBw==","tree_size":363,"utc":"2026-10-12T00:09:50.853871Z"}

000022.json

{"btc":{"hash":"00000000000000000001592763d02eee70a430460dadc647736e2590ab98c627","height":971157},"format":"beattime-checkpoint-v1","key":"e7y9THJIUKvNKOZHmdBjJ8E0bOKyBFVxxMpAJ8w574Y=","kind":"daily","last_chain_hash":"424c00d89baa02a635cebaa3999455fa6840653dfca708276dffe4c9b849c319","last_seq":392,"n":22,"prev":"06ee4c2fb4d6fbefcb71c23ff1193792aea67ff0d558991cb32ca050c268ec70","root":"5751a9808de2b85273bd2f416e0656b5f68944d54034e3ecdbba18f76eaddb48","sig":"DX+hY/jli591Vvr6cbA/sdbC/tOiG/jbUJnIOIBsQfTIOK71tleakTbLYXxcSodz5Rk7a61KdZp3GzFRGPR3DQ==","tree_size":392,"utc":"2026-10-13T00:09:50.843812Z"}

000023.json

{"btc":{"hash":"0000000000000000000070509ded08b767e49e2bfa8851c88a01e1b1a620b655","height":971320},"format":"beattime-checkpoint-v1","key":"e7y9THJIUKvNKOZHmdBjJ8E0bOKyBFVxxMpAJ8w574Y=","kind":"daily","last_chain_hash":"4bed3f87c3c85ecc0fdcda7418a4fc101ee8529b68a6833149293f1bb894f7dc","last_seq":404,"n":23,"prev":"9d25c608cc7cb1a716df0d4c65652e55e3f8f95095372ea83a8eef5ee72af0c1","root":"ee95decc52adbf7993fb9c972b5f320e34d2daeb4c04eb8d3294dd90a085d03b","sig":"tGmy+LahXK7HYAToHOKzxN0kI3JEfBgjx69YL6355z1GFzYvNINEKh9UcpEU99FGIQ0UW82xF78qpbbMqqg0BQ==","tree_size":404,"utc":"2026-10-14T00:09:51.552901Z"}

000024.json

{"btc":{"hash":"00000000000000000000809085ceb823547400a4efa66171a2d0da09a467ff15","height":971480},"format":"beattime-checkpoint-v1","key":"e7y9THJIUKvNKOZHmdBjJ8E0bOKyBFVxxMpAJ8w574Y=","kind":"daily","last_chain_hash":"81efe6553fdad0052625ca4111b6917b9877424dcdb0e12e101af4e09a68968a","last_seq":418,"n":24,"prev":"1cc9768af3475eb0832d76822b04764621ce062450a631fc0ab1de6ff369dd29","root":"11a5033f54cdc4959a8e065df869b72ba600ffdd06be09baf5017e75d6f95165","sig":"JFMHaqJq0dD2/pg1aBGc47Dl4R2+UffRU553urmuml/U+R8cI55I8WIQ/ZL9TIx7stngN+rJS1S/t2FeA1OFBw==","tree_size":418,"utc":"2026-10-15T00:09:50.829762Z"}

000025.json

{"btc":{"hash":"000000000000000000016ddd7d8c5d993e10e4d75ebcb18bc537b875cff32716","height":971634},"format":"beattime-checkpoint-v1","key":"e7y9THJIUKvNKOZHmdBjJ8E0bOKyBFVxxMpAJ8w574Y=","kind":"daily","last_chain_hash":"81efe6553fdad0052625ca4111b6917b9877424dcdb0e12e101af4e09a68968a","last_seq":418,"n":25,"prev":"9b2d55a6202ec617505abd20f3a5d5032a9fe358452e812f41f2db52bbaf1cab","root":"11a5033f54cdc4959a8e065df869b72ba600ffdd06be09baf5017e75d6f95165","sig":"gy1fNd3Z90Yx+jA8K+1oouUSDmZD/x/vm53AqLKDkLAK3qMWPBkHaXbqYrRgwNVL0PaFxXiT+O+lKcqSbZ9OAw==","tree_size":418,"utc":"2026-10-16T00:09:50.848034Z"}

000026.json

{"btc":{"hash":"000000000000000000018504d5474eb1f66cc1f9e4339cda612627a5338340bd","height":971780},"format":"beattime-checkpoint-v1","key":"e7y9THJIUKvNKOZHmdBjJ8E0bOKyBFVxxMpAJ8w574Y=","kind":"daily","last_chain_hash":"8ef685e84aa04ab65c8dc582df91a46864e2394e248cf6d81f327a4f31b00b5b","last_seq":432,"n":26,"prev":"b93a55b4c13a697caf8158634b70836609fc4ab21df2b5c5597ffa08a46e70cf","root":"8ddbfd81b3ceafc58832df95ce76389acdf239c085705ebc123d8d972b4cefa9","sig":"I9QB60NvXC+/Sfqib6hHX6q4kZwCQokt+4Rr+L2P5jKPXOI4aL1BrL0n0GfRfa72QspltXUi+l1v+DZbHmpmBg==","tree_size":432,"utc":"2026-10-17T00:09:50.846081Z"}

000027.json

{"btc":{"hash":"00000000000000000000e03da833159ac60b5102582cc7f96b97fff9a88fe8f6","height":971917},"format":"beattime-checkpoint-v1","key":"e7y9THJIUKvNKOZHmdBjJ8E0bOKyBFVxxMpAJ8w574Y=","kind":"daily","last_chain_hash":"e46b6af181c2445f41e570dcb8f44c70cca2b96b510add31dd12ee30443b956b","last_seq":447,"n":27,"prev":"4dc4fc724117b29e474fcf72e0f167e1d3bfbe6f07ab416b8deac3b5928f4260","root":"f19fc2004faa295ed472bb1f1a64b94228da0f336ebbf64a3d2d184b8967368e","sig":"xd1yKbqi0HQJh6vR/v+s9bcIWZmAdYQS63Nd6rYhJlqoQp4mq1aR5Y9LnU6stwehM/BUxeh6gFsT+yHAQvJuDw==","tree_size":447,"utc":"2026-10-18T00:09:50.881824Z"}

000028.json

{"anchors":[{"bank":"Swissquote Bank SA (Swiss bank)","booked":"2026-10-13","reference":"1193723080","title":"MROOT 2026W41 51a7d596 b7fb3f73 2088a66e 30a17202 32d87b79 e131372c 2471e392 4f2573c1","week":"2026-W41"}],"btc":{"hash":"00000000000000000001e66b29883257a8cde5fbfe049ce13f8ec3a34574e217","height":972077},"dump":{"file":"2026-W42.jsonl","sha256":"316bbac61ea52cc00e0f19ca380c9ab6f22087392e09c1c4a8358925f50c52ba"},"format":"beattime-checkpoint-v1","key":"e7y9THJIUKvNKOZHmdBjJ8E0bOKyBFVxxMpAJ8w574Y=","kind":"weekly","last_chain_hash":"f989ddf859dd502613c49bb7996017b8d1b3e2b1a317713af069fad5ba8ae8d0","last_seq":451,"n":28,"prev":"efeb5a3c7892b1d05573d8256c1c4b7513ff64aa6a956604f09d636fb1b599f1","root":"0e58ab78c7db2869d9c55ead031b4d3880a3812de2f10fce05c4f2200cb90cf1","sig":"YyfNrwm0nqd0DS1vLs6Bilz3wKwK/hWAyzIij6YjglKadtKSwmqEJrWtPo+TLaU5VDKGu/C5AUD/JH6tKsemBg==","tree_size":451,"utc":"2026-10-19T00:09:50.897353Z","week":"2026-W42","week_root":"276ed25ad72c37ebfccb0ed176de6e86cd9f7273d54b2579195de73840cef391","week_size":88}

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