How this works / Signed record

Problem revision

What caused Earth's record-low reflectivity in 2023?

This record was signed by PubPhys and added to the public log. Download the proof and check it with the open verifier: it recomputes every fingerprint, checks the PubPhys signature against the published key, finds the entry in the log and checks the Bitcoin date, without relying on this site.

Record hash
d55b86723dd8d32f417e0f8b80671a58de65648607d8187314a0729cb7727d93
Content hash
c5644424a1d189c74c4f6954c02d69232fc99f9eb8a1a1e5bfeee4aff3fa24b1
Signed by
c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da
Log entry
1,296
Checkpoint
Size 2,123, being published
Bitcoin date
Block 969,698
Created (claimed)
2026-10-03T07:18:02Z — the Bitcoin date is the one that counts
Download proof (bundle) Record as JSON Keys