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 (latest version: 2026-Q3). 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
- #17 (daily)
- Issued
2026-10-09T00:09:51.044067Z- File SHA-256
fd82aebfbc4aa0b5e3a7339a6a4454b51c60e810f7c302466a8147278c84779c- Global tree
tree_size331, roota2f551388d6a734b336c97644c6ae3f437809eafa5d32efb8843c977b84bf884- Bitcoin block
- 970547
0000000000000000000193f7f86939c64df366ca2eb137946aa9cfb9b3588fc6
Weeks
| Week | Checkpoints | Weekly checkpoint |
|---|---|---|
| 2026-W41 | 5 (#13–#17) | week still open |
| 2026-W40 | 8 (#5–#12) | #12, SHA-256 5792a1d213797b8f909dc6a76ee8c0243c6c250742697fd96722d5236c390dd4 |
| 2026-W39 | 4 (#1–#4) | #4, SHA-256 fa5b17dafbec6c921e3a9e10db7a2c836ed303c1eee50d206302692242184e15 |
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.