notbefore

Consumer CLI for the public qrng-beacon-log — an hourly, commit-then-reveal, host-attested randomness log anchored to drand quicknet, RFC 3161 timestamps, Rekor and OpenTimestamps. Spec: NOTBEFORE.md (draft 0.5) in https://github.com/docdailey/qrng-beacon-log.

What it proves: the 32-byte attested value (V) of hour (N) was fixed before drand round (R) and not selected after (R) existed. What it does not prove: that the bits are quantum, secret, certified, or unique. This is not a certification of anything; see CLAIMS.md in the log repository.

pip install notbefore            # PyPI; needs git and openssl on PATH; add [anchors] for OpenTimestamps proofs
notbefore verify 45              # commit 44 + reveal 45: signatures (pinned keys), drand BLS offline, RFC 3161, Rekor anchors, checkpoint inclusion
notbefore value 45               # V, only if verify passes (stdout only)
notbefore seed 45 --purpose cohort-allocation-2026-09              # S = SHA256("notbefore/derive/v1" || V || purpose)
notbefore split 45 --purpose cohort-allocation-2026-09 --frac 0.8 cohort.txt    # cohort.txt.A / cohort.txt.B
notbefore sample 45 --purpose chart-audit-2026-09 --k 12 cohort.txt             # exactly 12
notbefore assign 45 --purpose pilot-arms-2026-09 --arms 2 cohort.txt            # record<TAB>arm, balanced
notbefore id 45 --purpose blind-ids-2026-09 --from cohort.txt                   # pseudonyms, no names in the output
notbefore range 45 --purpose start-page --lo 1 --hi 240                         # one uniform integer
notbefore bytes 45 --purpose sim-seed --n 32                                    # public bytes to seed a simulation
notbefore plan --after 2026-10-01T00:00Z --purpose chart-audit-2026-q4 --sample 50 eligible.txt   # decision contract, timestamped by two TSAs
notbefore execute notbefore-plan-chart-audit-2026-q4.json   # later: no choices; rule-selected pulse; latest token must predate the round
notbefore explain 45             # a methods-section paragraph
notbefore pin                    # notbefore.lock: re-runs verify at exactly this log commit
notbefore diff-transcript a.json b.json
notbefore checkpoint             # the log's signed head; site cross-check; cached-head consistency

Walkthrough with real files and the exact transcript: USAGE.md.

Streams, for scripting. Payloads go to stdout only; the verification transcript goes to stderr. So V=$(notbefore value 45) is the 64-hex value and nothing else, and notbefore shuffle … > out.txt is clean. -q silences the PASS/INFO lines; FAIL/WARN lines and a non-zero exit still report a bad pair. --json gives a machine-readable result on stdout.

seed, shuffle and split write a transcript JSON (notbefore-<seq>-<purpose>.json) — the engineering artifact that lets anyone reproduce the result from the public log.

Trust model. The verifier, the signing keys, the drand group key, the Rekor log key, the freetsa CA and the expected host configuration are vendored inside this package, pinned at a named commit of the log repository (notbefore --version prints it). The CLI executes only those files; the log is read as data. Updating the verifier means updating the package — deliberately.

Two publication surfaces. The log is read from git (a cached clone of the repository, or --log-dir); https://notbefore.net serves the same repository statically. Since 2026-09-12 (log identity notbefore.net/log), verify also fetches https://notbefore.net/checkpoint and requires it to be the same head as git's, or an append-only relative of it — two different heads under the log's key is a split between surfaces and fails loudly (--checkpoint-url overrides).

Eligible pairs start at 0020/0021 (0026/0027 preferred, execution enforced). verify 19 fails by design (ERR-007). Pulses 0001–0041 carry retroactive anchors (2026-09-12 12:47 UTC); from 0042 anchors are contemporaneous.

MIT. Data in the log: CC BY 4.0.

Releasing (operators): RELEASING.md — every change to the verifier or keys needs a new package, and the flow there is the only way one gets made.