Pith Number

pith:FRBOARP7

pith:2013:FRBOARP7DAY7DYUQRR6KV5K5F2

not attested not anchored not stored refs pending

Measuring the Cooling of the Neutron Star in Cassiopeia A with all Chandra X-ray Observatory Detectors

(2) University of Southampton, (3) Ioffe Physical Technical Institute, (4) Harvard Center for Astrophysics), C. O. Heinke (1), D. G. Yakovlev (3), D. J. Patnaude (4), G. R. Sivakoff (1), K. G. Elshamouty (1), L. David (4) ((1) University of Alberta, P. S. Shternin (3), W. C. G. Ho (2)

arxiv:1306.3387 v2 · 2013-06-14 · astro-ph.HE

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{FRBOARP7DAY7DYUQRR6KV5K5F2}

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	2026-05-18T01:49:22.351049Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2c42e045ff1831f1e2908c7caaf55d2e9788d704f7027f20799cb14d7e69fcac

Aliases

arxiv: 1306.3387 · arxiv_version: 1306.3387v2 · doi: 10.48550/arxiv.1306.3387 · pith_short_12: FRBOARP7DAY7 · pith_short_16: FRBOARP7DAY7DYUQ · pith_short_8: FRBOARP7

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/FRBOARP7DAY7DYUQRR6KV5K5F2 \
  | 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: 2c42e045ff1831f1e2908c7caaf55d2e9788d704f7027f20799cb14d7e69fcac

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "dbdc936d68a0223d68c2af6521bfeb067aeb1c6f2ae609bb26ad50bdd9fe703c",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2013-06-14T12:55:29Z",
    "title_canon_sha256": "acd0cc717c7c501072befd34075c6816e0fb14197400e63ae19a939e81a11d7b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1306.3387",
    "kind": "arxiv",
    "version": 2
  }
}