How this works / Signed record

Problem revision

A practical functional that obeys the flat-plane condition

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
a754ae190f8564c40dd02646a107d8f5d95bab993397c1b6076b67fb059fbeb2
Content hash
2027ce2ce13512d002e7112166b007d8f9a2cb807d7a6b55af8cba036105ad84
Signed by
c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da
Log entry
858
Checkpoint
Size 2,123, being published
Bitcoin date
Block 969,698
Created (claimed)
2026-10-03T07:17:58Z — the Bitcoin date is the one that counts