How this works / Signed record

Problem revision

What started and ended the Neoproterozoic Snowball Earth glaciations?

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
dba2c2e8b76add958a9f82e57c2bd6ad60e843e4f560d250fc1fdd4e1cd030a9
Content hash
0895fa2b4f58dffee9fba9fd877e1f4504d9a75bd8c9f87ec67cec7b7ac01ba9
Signed by
c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da
Log entry
1,352
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
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