Pith Number

pith:PQEPD7P4

pith:2022:PQEPD7P4JWIH2O7MD7FSHZ5W2G

not attested not anchored not stored refs pending

From atomic physics, to upper-atmospheric chemistry, to cosmology: A "laser photometric ratio star" to calibrate telescopes at major observatories

Dmitry Budker, H. R. Sadeghpour, Justin E. Albert

arxiv:2203.07556 v1 · 2022-03-14 · astro-ph.IM · astro-ph.CO · physics.atom-ph · physics.chem-ph

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{PQEPD7P4JWIH2O7MD7FSHZ5W2G}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-07-05T04:05:19.763673Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7c08f1fdfc4d907d3bec1fcb23e7b6d19fcf1231aede9207b487fce5e818ab6e

Aliases

arxiv: 2203.07556 · arxiv_version: 2203.07556v1 · doi: 10.48550/arxiv.2203.07556 · pith_short_12: PQEPD7P4JWIH · pith_short_16: PQEPD7P4JWIH2O7M · pith_short_8: PQEPD7P4

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/PQEPD7P4JWIH2O7MD7FSHZ5W2G \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 7c08f1fdfc4d907d3bec1fcb23e7b6d19fcf1231aede9207b487fce5e818ab6e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b2584950f2f9bdd6ef098fae29534b4c32bd1249ffaf3b502b144c058fce0cac",
    "cross_cats_sorted": [
      "astro-ph.CO",
      "physics.atom-ph",
      "physics.chem-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2022-03-14T23:38:10Z",
    "title_canon_sha256": "ab29bdcd32c1e210d27b32ec53e313a525b99100f5b18c4eebc9e98ab66308ed"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2203.07556",
    "kind": "arxiv",
    "version": 1
  }
}