How this works / Signed record

Problem revision

What powered the geodynamo before the inner core existed?

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
42f002b66520f7698177d5eac7b296b8f522b1043e236bc90ff8792599f07739
Content hash
742f2c8a800d78187147683e00e46c0b66faa715a06f21fcea15abb63ca7dd04
Signed by
c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da
Log entry
1,315
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