How this works / Signed record

Problem revision

How did early Earth stay unfrozen under a fainter young Sun?

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
3e9cbdf630d49b1ee93097d6ee819abe66fefe5e824f82d1d5d4303feb56bc32
Content hash
1d42dc53a6df8cef3e5342a5db7d5073694d4a9a744d16a21a40bcf04d3d8cb8
Signed by
c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da
Log entry
1,349
Checkpoint
Size 2,123, being published
Bitcoin date
Block 969,698
Created (claimed)
2026-10-03T07:18:03Z — the Bitcoin date is the one that counts