Pith Number

pith:OCKPEDJ2

pith:2009:OCKPEDJ25KMO4BCAAJI7ZVOVZN

not attested not anchored not stored refs pending

The Origin of Extended Disk Galaxies at z=2

Amina Helmi, Claudio Dalla Vecchia, Joop Schaye, Julio F. Navarro, Laura V. Sales, Marcel R. Haas, Volker Springel

arxiv:0905.3554 v2 · 2009-05-21 · 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{OCKPEDJ25KMO4BCAAJI7ZVOVZN}

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	2026-07-04T15:53:37.290416Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7094f20d3aea98ee04400251fcd5d5cb6df1e25e500a82c43987e50af000ea89

Aliases

arxiv: 0905.3554 · arxiv_version: 0905.3554v2 · doi: 10.48550/arxiv.0905.3554 · pith_short_12: OCKPEDJ25KMO · pith_short_16: OCKPEDJ25KMO4BCA · pith_short_8: OCKPEDJ2

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/OCKPEDJ25KMO4BCAAJI7ZVOVZN \
  | 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: 7094f20d3aea98ee04400251fcd5d5cb6df1e25e500a82c43987e50af000ea89

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "35927fbd8a96c4a47426b0a8f4b49b93ef781baf8eaa36285c088c5df4c2cc7b",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-05-21T20:01:53Z",
    "title_canon_sha256": "fa743ff52f04203720a7dee0f707363453c0080d2a06b1e1c48e0ebbf93fbf68"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0905.3554",
    "kind": "arxiv",
    "version": 2
  }
}