Checkpoints of week 2026-W39

21 September 2026 – 27 September 2026 (UTC) · 4 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

#4

Issued

2026-09-28T00:09:50.667159Z

File SHA-256

fa5b17dafbec6c921e3a9e10db7a2c836ed303c1eee50d206302692242184e15

Global tree

tree_size 191, root 16dc27e4119d4fbc33af32dfd1ab103f5b7bee3fc726993db56cfacf0667927c

Last entry

seq 191, chain hash 9c2df760a30c32a491e7757e648d8db735342294400665e97f4b5a91c9dd201a

Bitcoin block

968903 000000000000000000019ce8e1e0f05e3d2b480926e0ff9db007ba651f145e7c

Previous checkpoint

b26d5b91809461ef50268d7363f7b9e9b984115b7aaf60f222bae918d90158f0

Week entries

33

Weekly Merkle root

9f1babe3064904b9bc292162083beab4ba970f270cf33e6b3009fc6bf190da43

Weekly dump

2026-W39.jsonl, SHA-256 d1036f583da53244f4b4a1d28d9cf6f3b71f80a02768ea7f890791667d7540ee

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

Checkpoint #1 is the first one ever issued. It covers every entry since the log began on 15 June 2026; the weeks before it are sealed by their own signed weekly roots, OpenTimestamps proofs and bank transfers (proof page).

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: 4 of 4 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 13. All bank anchors.

GitHub

Immutable release 2026-W39 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 000001.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

000001.json

{"btc":{"hash":"00000000000000000000e60c66899c2162db615df65ee678c20c834162194e41","height":968542},"format":"beattime-checkpoint-v1","key":"e7y9THJIUKvNKOZHmdBjJ8E0bOKyBFVxxMpAJ8w574Y=","kind":"daily","last_chain_hash":"2b7de591a11151b396097701714f6d84cd4b71e714bb68cfd03b7b3726621090","last_seq":171,"n":1,"prev":null,"root":"d201ae00c834041d29a674358e442481a37ab6f01719e89012180fa44c39a25d","sig":"Zl/g+5RXdjgbbnS53IzcTiHxOEwJQjJk0rh2eppV8psA8Bf959/fPlioa7ouoDvzvjyn0NKqaaHGos6RXN2mAA==","tree_size":171,"utc":"2026-09-25T12:09:44.220276Z"}

000002.json

{"btc":{"hash":"0000000000000000000206860322d9b29efdc0a5ea0a4ff8291d3c4e8a3bbce2","height":968602},"format":"beattime-checkpoint-v1","key":"e7y9THJIUKvNKOZHmdBjJ8E0bOKyBFVxxMpAJ8w574Y=","kind":"daily","last_chain_hash":"373e27d69c849b4fb43a6fdf073facd48c85e4089bfb1b4ae4fdc4a0aa6b0651","last_seq":173,"n":2,"prev":"31db020f471ba267a4538ed31a8f7f10e12b9c4d15832dc5e4594997308e164c","root":"4af8444c8c8c445c6e2347b6d163f542c66d24cba1dbdc1d7e46aae4d761aa7d","sig":"SN2JYNlvhtD/KVhjMEPaqBiSZSalaHen2Hk9pVQ8+Tk/JvDF0Sq6b62DfoY2jMC+vqWtji8GuPJ0rRRNIiKwAA==","tree_size":173,"utc":"2026-09-26T00:09:50.592588Z"}

000003.json

{"btc":{"hash":"00000000000000000000cc3454148dd4af5d3ac25f346443b988bb797c271846","height":968756},"format":"beattime-checkpoint-v1","key":"e7y9THJIUKvNKOZHmdBjJ8E0bOKyBFVxxMpAJ8w574Y=","kind":"daily","last_chain_hash":"8b780ace12f88e1c0e4255d870089a6384cc7bca4a34af1421ec36c79bae7933","last_seq":176,"n":3,"prev":"40013dc859c40b38267c12552e82f9f736549416b8e99159c2673b1bfb52e154","root":"ef8861111817fb4c575ca39f3eceb486c52f7834327b4416df55095c2a23516f","sig":"C2YeU6IctuE2aBGTYKJE5tgTEy8XxjKqd3AQCrTapu5hNZE2NSOe1H1yqikPW4Nc0zXlcPXkgDeB34GPFmeZAA==","tree_size":176,"utc":"2026-09-27T00:09:50.714383Z"}

000004.json

{"anchors":[{"bank":"Swissquote Bank SA (Swiss bank)","booked":"2026-06-23","reference":"1122189662","title":"MROOT 2026W25 1b33c081 be206b02 8d508be5 046a3da6 a195448f bded7d54 a6f2e02d 13a5749d","week":"2026-W25"},{"bank":"Swissquote Bank SA (Swiss bank)","booked":"2026-06-30","reference":"1127113185","title":"MROOT 2026W26 b460cb71 6fbf3481 480b428f 97d7ec11 5d8816f0 fcb3669a 85e03774 065256b8","week":"2026-W26"},{"bank":"Swissquote Bank SA (Swiss bank)","booked":"2026-07-06","reference":"1132054035","title":"MROOT 2026W27 a66f790c a3fdd097 dadf2422 6139aa14 8ae9b84e 29e8aec5 3accf5e2 2b594fbf","week":"2026-W27"},{"bank":"Swissquote Bank SA (Swiss bank)","booked":"2026-07-23","reference":"1141610457","title":"MROOT 2026W29 72c71c70 291a6d3c ebf5e84e be0a0116 3187a56c cd469785 beb06b79 346f292a","week":"2026-W29"},{"bank":"Swissquote Bank SA (Swiss bank)","booked":"2026-08-04","reference":"1148932604","title":"MROOT 2026W31 ec00a1a0 bc015e4b 13feda72 fe0dd859 507d48f8 59da8149 8c2a1ece ab970253","week":"2026-W31"},{"bank":"Swissquote Bank SA (Swiss bank)","booked":"2026-08-10","reference":"1152611848","title":"MROOT 2026W32 d9c958ab 2f36d533 bd7a054f 89348324 a973cd7a 3fa0141a 80503b60 4c41d02f","week":"2026-W32"},{"bank":"Swissquote Bank SA (Swiss bank)","booked":"2026-08-18","reference":"1156833423","title":"MROOT 2026W33 7a1465c1 c122c9f7 88f6e10d 563f440b 3784b111 dfbddcef 3ac02027 8d07ce96","week":"2026-W33"},{"bank":"Swissquote Bank SA (Swiss bank)","booked":"2026-08-25","reference":"1161577508","title":"MROOT 2026W34 ff3a7633 58a943dc 75e4b0a4 85f13504 7ecb637a b47ae6ea b1d8ced1 888c8e17","week":"2026-W34"},{"bank":"Swissquote Bank SA (Swiss bank)","booked":"2026-09-01","reference":"1165796278","title":"MROOT 2026W35 5e063fd4 5948dff2 c7c51438 6acc1d87 6132566e ca203f5f 4bcf7e9c 8c85067d","week":"2026-W35"},{"bank":"Swissquote Bank SA (Swiss bank)","booked":"2026-09-10","reference":"1169672496","title":"MROOT 2026W36 9f4047d4 e380e4aa fe5c74e5 c79adaea 91e4e17d 06451d6b 28794220 6402cb9b","week":"2026-W36"},{"bank":"Swissquote Bank SA (Swiss bank)","booked":"2026-09-15","reference":"1174262612","title":"MROOT 2026W37 6e6195e7 b3fc6875 9313b51a d9cdc956 1aa0f2ea 7ac3543a c7fc2335 b6b069de","week":"2026-W37"},{"bank":"Swissquote Bank SA (Swiss bank)","booked":"2026-09-21","reference":"1177850516","title":"MROOT 2026W38 731921cf 38dd2447 4ddd4719 489c9699 99334761 ddaa4c60 c2534cab 674b5c3e","week":"2026-W38"},{"bank":"Swissquote Bank SA (Swiss bank)","booked":"2026-07-28","reference":"1144955485","title":"MROOT 2026W30 955c4945 62039bfa db857622 fffb95a9 881c5250 f7cd9a94 79d36311 2c5f55dd","week":"2026-W30"}],"btc":{"hash":"000000000000000000019ce8e1e0f05e3d2b480926e0ff9db007ba651f145e7c","height":968903},"dump":{"file":"2026-W39.jsonl","sha256":"d1036f583da53244f4b4a1d28d9cf6f3b71f80a02768ea7f890791667d7540ee"},"format":"beattime-checkpoint-v1","key":"e7y9THJIUKvNKOZHmdBjJ8E0bOKyBFVxxMpAJ8w574Y=","kind":"weekly","last_chain_hash":"9c2df760a30c32a491e7757e648d8db735342294400665e97f4b5a91c9dd201a","last_seq":191,"n":4,"prev":"b26d5b91809461ef50268d7363f7b9e9b984115b7aaf60f222bae918d90158f0","root":"16dc27e4119d4fbc33af32dfd1ab103f5b7bee3fc726993db56cfacf0667927c","sig":"w6kyliXfwmA+CNvGYzHSdngPMlqR9jtOvdNdIZevtmfCP9thZQXwvSdarpW7DM4XGOZgHfDoVF8svYC33d4UDg==","tree_size":191,"utc":"2026-09-28T00:09:50.667159Z","week":"2026-W39","week_root":"9f1babe3064904b9bc292162083beab4ba970f270cf33e6b3009fc6bf190da43","week_size":33}

All weeks