Pith Number

pith:HBA6V2N2

pith:2018:HBA6V2N2E5XZ37INI4QXOKPHMQ

not attested not anchored not stored refs pending

An Ultra Metal-poor Star Near the Hydrogen-burning Limit

Andrew R. Casey, Ian B. Thompson, Kevin C. Schlaufman

arxiv:1811.00549 v1 · 2018-11-01 · astro-ph.SR · 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{HBA6V2N2E5XZ37INI4QXOKPHMQ}

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	2026-05-18T00:00:47.026516Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3841eae9ba276f9dfd0d47217729e764173461bcede104c1a206948ac9e39330

Aliases

arxiv: 1811.00549 · arxiv_version: 1811.00549v1 · doi: 10.48550/arxiv.1811.00549 · pith_short_12: HBA6V2N2E5XZ · pith_short_16: HBA6V2N2E5XZ37IN · pith_short_8: HBA6V2N2

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/HBA6V2N2E5XZ37INI4QXOKPHMQ \
  | 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: 3841eae9ba276f9dfd0d47217729e764173461bcede104c1a206948ac9e39330

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b4b9a100717c5a2b02f2ba6156a7d508cb46311954342df80d9b144854fe4e91",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2018-11-01T18:00:00Z",
    "title_canon_sha256": "f4662b17d3d3b93ba3f03bcda68b9d076b3f24a15015d575ffd12b10e8829f66"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1811.00549",
    "kind": "arxiv",
    "version": 1
  }
}