Pith Number

pith:7ILCO2XR

pith:2011:7ILCO2XRQ3N6CHKJWYSSOEZRI4

not attested not anchored not stored refs pending

Light echoes reveal an unexpectedly cool Eta Carinae during its 19th-century Great Eruption

A. Rest, B. Sinnott, D. A. Howell, D. L. Welch, D. Minniti, F. B. Bianco, H. E. Bond, I. Toledo, J. L. Prieto, K. Mandel, M. E. Huber, N. R. Walborn, N. Smith, R. Chornock, R. C. Smith, R. J. Foley, W. Fong

arxiv:1112.2210 v1 · 2011-12-09 · astro-ph.GA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{7ILCO2XRQ3N6CHKJWYSSOEZRI4}

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	2026-05-18T02:53:05.012402Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fa16276af186dbe11d49b6252713314702a6b2f8ca1f2f108f16924aaad7ae2d

Aliases

arxiv: 1112.2210 · arxiv_version: 1112.2210v1 · doi: 10.48550/arxiv.1112.2210 · pith_short_12: 7ILCO2XRQ3N6 · pith_short_16: 7ILCO2XRQ3N6CHKJ · pith_short_8: 7ILCO2XR

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/7ILCO2XRQ3N6CHKJWYSSOEZRI4 \
  | 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: fa16276af186dbe11d49b6252713314702a6b2f8ca1f2f108f16924aaad7ae2d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2ce94f78378ad2db55aab314fdf7469fca7e39f3f1354a4cfdaf2e5a4913778e",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2011-12-09T21:00:01Z",
    "title_canon_sha256": "e7b079b85a2696df68342e1c46b51e9ff98c0f6c90f668bcaf24a490424e0846"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1112.2210",
    "kind": "arxiv",
    "version": 1
  }
}