{"sources":[{"key":"csprng","label":"Operating System CSPRNG","class":"A","class_label":"Cryptographic","caveat":null,"origin":"The kernel entropy pool \u2014 interrupt timings, device jitter and, on this machine, the CPU hardware RNG.","refresh_seconds":0,"status":"up","failures":0,"current":null,"proof_url":null,"observed_at":null},{"key":"anu-qrng","label":"ANU Quantum Vacuum","class":"A","class_label":"Cryptographic","caveat":null,"origin":"Fluctuations of the quantum vacuum field, measured by homodyne detection at the Australian National University.","refresh_seconds":0,"status":"up","failures":1,"current":null,"proof_url":null,"observed_at":null},{"key":"random-org","label":"RANDOM.ORG","class":"A","class_label":"Cryptographic","caveat":null,"origin":"Atmospheric radio noise, largely driven by lightning discharges, captured by receivers in Dublin.","refresh_seconds":0,"status":"up","failures":0,"current":null,"proof_url":null,"observed_at":null},{"key":"nist-beacon","label":"NIST Randomness Beacon","class":"B","class_label":"Public beacon","caveat":"Published openly \u2014 anyone can look this value up after the fact.","origin":"A hardware entropy source at the US National Institute of Standards and Technology, hash-chained and signed every minute.","refresh_seconds":60,"status":"up","failures":0,"current":"NIST Beacon pulse #1,939,994 \u2014 chained to every pulse before it, and signed.","proof_url":"https:\/\/beacon.nist.gov\/beacon\/2.0\/chain\/2\/pulse\/1939994","observed_at":"2026-09-13T19:20:00+00:00"},{"key":"drand","label":"drand \u00b7 League of Entropy","class":"B","class_label":"Public beacon","caveat":"Published openly \u2014 anyone can look this value up after the fact.","origin":"A threshold BLS signature jointly produced every three seconds by independent operators across several continents.","refresh_seconds":3,"status":"up","failures":0,"current":null,"proof_url":null,"observed_at":null},{"key":"bitcoin","label":"Bitcoin Proof-of-Work","class":"B","class_label":"Public beacon","caveat":"Published openly \u2014 anyone can look this value up after the fact.","origin":"The block header hash the entire Bitcoin network spent roughly ten minutes of global hashrate searching for.","refresh_seconds":60,"status":"up","failures":0,"current":"Bitcoin block 966,861 \u2014 20 leading zeros of proof-of-work, found about ten minutes ago.","proof_url":"https:\/\/mempool.space\/block\/000000000000000000005e195fa6ae84a58d9938e9b928758a8d9c001e38233a","observed_at":"2026-09-13T19:20:35+00:00"},{"key":"seismic","label":"USGS Seismic Feed","class":"C","class_label":"Observational","caveat":"Carries only tens of bits of genuine surprise. Always mixed with the OS CSPRNG.","origin":"Every earthquake above the detection threshold recorded anywhere on Earth in the past hour, published by the US Geological Survey.","refresh_seconds":60,"status":"up","failures":0,"current":null,"proof_url":null,"observed_at":null},{"key":"space-weather","label":"NOAA Space Weather","class":"C","class_label":"Observational","caveat":"Carries only tens of bits of genuine surprise. Always mixed with the OS CSPRNG.","origin":"The planetary K-index \u2014 how much the solar wind is currently disturbing Earth's magnetic field, measured by NOAA.","refresh_seconds":60,"status":"up","failures":0,"current":"Planetary K-index 0.67 \u2014 the geomagnetic field was quiet when this was made.","proof_url":"https:\/\/www.swpc.noaa.gov\/products\/planetary-k-index","observed_at":"2026-09-13T19:17:00+00:00"},{"key":"atmosphere","label":"Live Weather","class":"C","class_label":"Observational","caveat":"Carries only tens of bits of genuine surprise. Always mixed with the OS CSPRNG.","origin":"Temperature, wind and pressure read from a weather station somewhere on Earth, chosen at random for each draw.","refresh_seconds":300,"status":"up","failures":0,"current":null,"proof_url":null,"observed_at":null},{"key":"iss","label":"ISS Position","class":"C","class_label":"Observational","caveat":"Carries only tens of bits of genuine surprise. Always mixed with the OS CSPRNG.","origin":"The ground track of the International Space Station, 408 km up and moving at 27,600 km\/h.","refresh_seconds":5,"status":"down","failures":3,"current":null,"proof_url":null,"observed_at":null}]}