Pith Number

pith:CHQJNUBH

pith:2010:CHQJNUBHOPSI2INSCGSGEY3QLE

not attested not anchored not stored refs pending

Comment on "21-cm Radiation: A New Probe of Variation in the Fine-Structure Constant"

S.G. Porsev, V.V. Flambaum

arxiv:1004.2540 v2 · 2010-04-15 · astro-ph.CO · physics.atom-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{CHQJNUBHOPSI2INSCGSGEY3QLE}

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	2026-05-18T02:33:34.259677Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

11e096d02773e48d21b211a46263705908b570150867ea7ab8ca6aad5d189efd

Aliases

arxiv: 1004.2540 · arxiv_version: 1004.2540v2 · doi: 10.48550/arxiv.1004.2540 · pith_short_12: CHQJNUBHOPSI · pith_short_16: CHQJNUBHOPSI2INS · pith_short_8: CHQJNUBH

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/CHQJNUBHOPSI2INSCGSGEY3QLE \
  | 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: 11e096d02773e48d21b211a46263705908b570150867ea7ab8ca6aad5d189efd

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0925b5c0fc33f54cc95eb3b555ef80e373152644fea79a2615fe02c91eb25b87",
    "cross_cats_sorted": [
      "physics.atom-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2010-04-15T03:10:56Z",
    "title_canon_sha256": "aafd952c77e62cfec248c773613985b56b7cb305e3c23cd693c2c055b07b7516"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1004.2540",
    "kind": "arxiv",
    "version": 2
  }
}