Pith Number

pith:HPUFO55E

pith:2009:HPUFO55EVSLIWOOMG45XMLM5O3

not attested not anchored not stored refs pending

Damped and sub-damped Lyman-? absorbers in z > 4 QSOs

Ali Aghaee (USB, George Djorgovski (CALTECH), IPM), Pasquier Noterdaeme (IUCAA), Patrick Petitjean (IAP), Paulo Da Rocha Poppe (UEFS), Reinaldo Ramos De Carvalho (INPE), Rodney Guimaraes (UEFS), Sandra Castro (ESO)

arxiv:0909.4839 v2 · 2009-09-26 · 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{HPUFO55EVSLIWOOMG45XMLM5O3}

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	2026-05-18T00:56:58.617921Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3be85777a4ac968b39cc373b762d9d76e4689f61a482556f230ce84742bc36ec

Aliases

arxiv: 0909.4839 · arxiv_version: 0909.4839v2 · doi: 10.48550/arxiv.0909.4839 · pith_short_12: HPUFO55EVSLI · pith_short_16: HPUFO55EVSLIWOOM · pith_short_8: HPUFO55E

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/HPUFO55EVSLIWOOMG45XMLM5O3 \
  | 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: 3be85777a4ac968b39cc373b762d9d76e4689f61a482556f230ce84742bc36ec

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f8f8a3275900e669109a8245b69404987baa525a334f5adf370281c46bc271a7",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-09-26T06:06:22Z",
    "title_canon_sha256": "a0cf9b4d5913f1a6298ec3f3479bfdbc93f18c341339f51e65e35166e2efb371"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0909.4839",
    "kind": "arxiv",
    "version": 2
  }
}