Pith Number

pith:NN5JOZ62

pith:2013:NN5JOZ62DI2U6JN7FI2RN5PBQC

not attested not anchored not stored refs pending

The Dark Energy Cosmic Clock: A New Way to Parametrise the Equation of State

Antonio Padilla, Constantinos Skordis, Edmund J. Copeland, Ewan R. M. Tarrant

arxiv:1304.5532 v2 · 2013-04-19 · astro-ph.CO · hep-th

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{NN5JOZ62DI2U6JN7FI2RN5PBQC}

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	2026-05-18T03:04:59.486958Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6b7a9767da1a354f25bf2a3516f5e180b464a5df50143dc2faf3ff3737320656

Aliases

arxiv: 1304.5532 · arxiv_version: 1304.5532v2 · doi: 10.48550/arxiv.1304.5532 · pith_short_12: NN5JOZ62DI2U · pith_short_16: NN5JOZ62DI2U6JN7 · pith_short_8: NN5JOZ62

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/NN5JOZ62DI2U6JN7FI2RN5PBQC \
  | 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: 6b7a9767da1a354f25bf2a3516f5e180b464a5df50143dc2faf3ff3737320656

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "565d687cde7183b1bb2ca76ad105bbf76b7a3b3fc2e3ba3476fd0c268b5b7009",
    "cross_cats_sorted": [
      "hep-th"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2013-04-19T20:07:57Z",
    "title_canon_sha256": "042da57f0d2a88ae4aae63892c9438bd126ac7f4f075e8957ceea526625f06e3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1304.5532",
    "kind": "arxiv",
    "version": 2
  }
}