How this works / Signed record

Problem revision

How do ice-covered oceans transport heat and salt to their shells?

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
155a6c70b955f342971848f35c3f4d01aeef1ff0d7584bb6d43c29d21f23b3bc
Content hash
6856eb356d489119ae387554ddd227b04146952a1bd8f400a3eae69870091f6d
Signed by
c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da
Log entry
1,344
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