Public log checkpoints
The state of the whole proof log, signed every day and after every closed week.
Each checkpoint signs the Merkle tree over every entry of the log and is chained to the previous checkpoint by the SHA-256 of its file. Each one names a recent Bitcoin block and is anchored in Bitcoin through OpenTimestamps. Every week is copied to an immutable release on GitHub (DeiFlagellum/sigelith-log) and saved in the Internet Archive, and every quarter the complete log is deposited in Zenodo with a permanent DOI. Anyone can download the log and check that nothing was removed or rewritten — without trusting us.
Checkpoints began on 25 September 2026. The first one 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).
Latest checkpoint
- Number
- #3 (daily)
- Issued
2026-09-27T00:09:50.714383Z- File SHA-256
b26d5b91809461ef50268d7363f7b9e9b984115b7aaf60f222bae918d90158f0- Global tree
tree_size176, rootef8861111817fb4c575ca39f3eceb486c52f7834327b4416df55095c2a23516f- Bitcoin block
- 968756
00000000000000000000cc3454148dd4af5d3ac25f346443b988bb797c271846
Weeks
| Week | Checkpoints | Weekly checkpoint |
|---|---|---|
| 2026-W39 | 3 (#1–#3) | week still open |
Machine access
/api/proof/checkpoints/latestand/api/proof/checkpoints/<n>— numbers run without gaps./checkpoints/<n:06d>.jsonand.json.ots— the exact files./api/proof/consistency?first=<m>&second=<n>— RFC 9162 consistency proof between the tree sizes of two checkpoints./api/proof/entriesand/api/proof/dumps— the whole log.
Formats and the verification procedure: the proof specification and the README of DeiFlagellum/sigelith-log.