Pith Number

pith:RIQNFSOF

pith:2011:RIQNFSOF2VRWS34EKFNVXLBEGI

not attested not anchored not stored refs pending

Allan Sandage and the Cosmic Expansion

Astronomy, B. Reindl (Department of Physics, G. A. Tammann, Univ. of Basel)

arxiv:1112.0170 v2 · 2011-12-01 · physics.hist-ph · astro-ph.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{RIQNFSOF2VRWS34EKFNVXLBEGI}

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	2026-05-18T01:59:20.551945Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8a20d2c9c5d563696f84515b5bac2432038ebdc71ae775230f02fc5be02c41ae

Aliases

arxiv: 1112.0170 · arxiv_version: 1112.0170v2 · doi: 10.48550/arxiv.1112.0170 · pith_short_12: RIQNFSOF2VRW · pith_short_16: RIQNFSOF2VRWS34E · pith_short_8: RIQNFSOF

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/RIQNFSOF2VRWS34EKFNVXLBEGI \
  | 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: 8a20d2c9c5d563696f84515b5bac2432038ebdc71ae775230f02fc5be02c41ae

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "585d7ba275d6c6079aef9e5bcaf0b5d2b59605d68a8469dd9ea3a785244526f8",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.hist-ph",
    "submitted_at": "2011-12-01T13:02:01Z",
    "title_canon_sha256": "c0e96120ff38e294bc2dac44135548ccf561711831d57a9392fb1a3c052b3a67"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1112.0170",
    "kind": "arxiv",
    "version": 2
  }
}