How this works / Signed record

Problem revision

Are the oldest stars too old for a Hubble constant of 0.73?

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
09249554d454444bf0dc4263eb84b6cc32d209a93365019d9c23f02d8cefbc73
Content hash
d1d79142e1129da3d17c593f9ca8f75c999ad8d2ea04ce32eb286b084c573f99
Signed by
c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da
Log entry
1,260
Checkpoint
Size 2,123, being published
Bitcoin date
Block 969,698
Created (claimed)
2026-10-03T07:18:02Z — the Bitcoin date is the one that counts