How this works / Signed record

Problem revision

Is contextuality the resource behind quantum computational speedup?

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
e06cf3105facf02c9ff8f525d2ba535dedee4b756b7c1e7221cfdab3633f7e6c
Content hash
0905db113a8e5ce42ee3f0d6ac9c4a0a21b99c32a05cb34405a884a8e550dbb5
Signed by
c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da
Log entry
1,982
Checkpoint
Size 2,123, being published
Bitcoin date
Block 969,698
Created (claimed)
2026-10-03T07:18:09Z — the Bitcoin date is the one that counts