How this works / Signed record

Topic

Formation of the first supermassive black holes

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
b31645054af13e29c5201707761f4cbb39ef8dced934561a5f80d1a755665bcf
Content hash
b8b594077559c139caeac6d9fd1b6c66415bed2fd652d8d40fc64decea956dad
Signed by
c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da
Log entry
37
Checkpoint
Size 2,123, being published
Bitcoin date
Block 969,698
Created (claimed)
2026-10-03T07:17:50Z — the Bitcoin date is the one that counts