How this works / Signed record

Problem revision

How much of Earth's heat flow comes from radioactive decay?

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
893a41e529174ef922d4033f325858c4e717f0031646b08e2206be8670643091
Content hash
82e89e697263e26688bb331b94083d3f78d198e5557361b7cef58d475b2fd63c
Signed by
c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da
Log entry
1,340
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