Pith Number

pith:A2Y7G437

pith:2011:A2Y7G4373UF4S7F7CRDSH7JZLR

not attested not anchored not stored refs pending

The low-metallicity QSO HE 2158-0107: A massive galaxy growing by the accretion of nearly pristine gas from its environment?

(2) Max-Planck-Institut f\"ur Astronomie, (3) Centro Astron\'omico Hispano Alem\'an de Calar Alto), B. Husemann (1), K. Jahnke (2), L. Wisotzki (1), S. F. S\'anchez (3) ((1) Leibniz-Institut f\"ur Astrophysik Potsdam

arxiv:1109.3309 v1 · 2011-09-15 · astro-ph.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{A2Y7G4373UF4S7F7CRDSH7JZLR}

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	2026-05-18T02:00:32.554438Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

06b1f3737fdd0bc97cbf144723fd395c591e505ed0ae2dc10b3178bd2676258e

Aliases

arxiv: 1109.3309 · arxiv_version: 1109.3309v1 · doi: 10.48550/arxiv.1109.3309 · pith_short_12: A2Y7G4373UF4 · pith_short_16: A2Y7G4373UF4S7F7 · pith_short_8: A2Y7G437

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/A2Y7G4373UF4S7F7CRDSH7JZLR \
  | 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: 06b1f3737fdd0bc97cbf144723fd395c591e505ed0ae2dc10b3178bd2676258e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0a0fd368a405b87402500b01f96168771ff5268534a090aacb46a38a354e8d69",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2011-09-15T10:33:35Z",
    "title_canon_sha256": "9160d6d259d9fc969c29dad2f7dfdf803f4fbfe05a5d4ee2b9a92321d37e1806"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1109.3309",
    "kind": "arxiv",
    "version": 1
  }
}