Pith Number

pith:N2L6S6FD

pith:2012:N2L6S6FDLV4APQJFCGNN4HAJAG

not attested not anchored not stored refs pending

Constraining the variation of fundamental constants at z ~ 1.3 using 21-cm absorbers

D. Albornoz Vasquez, H. Rahmani, N. Gupta, P. Noterdaeme, P. Petitjean, R. Srianand

arxiv:1206.2653 v1 · 2012-06-12 · astro-ph.CO · gr-qc · hep-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{N2L6S6FDLV4APQJFCGNN4HAJAG}

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	2026-05-18T01:56:59.246232Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6e97e978a35d7807c125119ade1c090196beb91b6f7d3026b2f66209e678fa90

Aliases

arxiv: 1206.2653 · arxiv_version: 1206.2653v1 · doi: 10.48550/arxiv.1206.2653 · pith_short_12: N2L6S6FDLV4A · pith_short_16: N2L6S6FDLV4APQJF · pith_short_8: N2L6S6FD

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/N2L6S6FDLV4APQJFCGNN4HAJAG \
  | 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: 6e97e978a35d7807c125119ade1c090196beb91b6f7d3026b2f66209e678fa90

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "fa74f2e96860263bf4358ae125e811d495ca432bf436b3b83225b7d38b592d30",
    "cross_cats_sorted": [
      "gr-qc",
      "hep-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2012-06-12T20:09:52Z",
    "title_canon_sha256": "076b390a36add0a58579609705bc7b4d402040837bec8933514beb6ee371de43"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1206.2653",
    "kind": "arxiv",
    "version": 1
  }
}