How this works / Signed record

Problem revision

How thick is Europa's ice shell and does it exchange material?

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
53f6b11a9e034d6f685d5cdb39b4e16266ccffa1e747e1e9244d3f918d6d92a2
Content hash
341cf8db639b788083dda34941cdd1d6cc367d3f09b6eaa0790863337ff50374
Signed by
c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da
Log entry
1,343
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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