Pith Number

pith:HRKCEKOK

pith:2012:HRKCEKOKEWLQV3237N3KBGWXJ4

not attested not anchored not stored refs pending

How accurately can we measure the hydrogen 2S->1S transition rate from the cosmological data?

Carlo Burigana, Jaiseung Kim, Pavel Naselsky, Tiziana Trombetti, Viatcheslav Mukhanov

arxiv:1205.5949 v2 · 2012-05-27 · 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{HRKCEKOKEWLQV3237N3KBGWXJ4}

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	2026-05-18T03:51:13.900069Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3c542229ca25970aef5bfb76a09ad74f0e424a96fd9da02f516311c052445438

Aliases

arxiv: 1205.5949 · arxiv_version: 1205.5949v2 · doi: 10.48550/arxiv.1205.5949 · pith_short_12: HRKCEKOKEWLQ · pith_short_16: HRKCEKOKEWLQV323 · pith_short_8: HRKCEKOK

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/HRKCEKOKEWLQV3237N3KBGWXJ4 \
  | 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: 3c542229ca25970aef5bfb76a09ad74f0e424a96fd9da02f516311c052445438

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "50efc49e408c9d8e22272670cb72cd3f3f27dc0b5e1eb6b427a887be6bd9359d",
    "cross_cats_sorted": [
      "physics.atom-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2012-05-27T08:35:43Z",
    "title_canon_sha256": "31eccd7ae5c0ce59cf1a91062140c50f526ff958def35ae18add45b624618d3d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1205.5949",
    "kind": "arxiv",
    "version": 2
  }
}