How this works / Signed record

Problem revision

Predict the amplitude and timing of solar cycle 26

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
439d681558aab220ea068d01ba18afd4f7873880b2f5bfdbe098a353d4ea311b
Content hash
229c3cd310a80ab9470d2d03c1bf443192beac4de32f38efd92852b1185a841d
Signed by
c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da
Log entry
619
Checkpoint
Size 2,123, being published
Bitcoin date
Block 969,698
Created (claimed)
2026-10-03T07:17:55Z — the Bitcoin date is the one that counts