How this works / Signed record

Problem revision

Minimal time to cool a quantum system near absolute zero

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
29ab3dfbb9f621d9ed7371a263f8c57d28a5c850d852c230ad8766c7741c9bb4
Content hash
d557483f9fdc97aa6ba9a3ac54a273a4915a3f66ed2bd67183133d4153db5609
Signed by
c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da
Log entry
2,041
Checkpoint
Size 2,123, being published
Bitcoin date
Block 969,698
Created (claimed)
2026-10-03T07:18:10Z — the Bitcoin date is the one that counts