Pith Number

pith:D2NN4XXM

pith:2008:D2NN4XXM2VMK5HNGE376BQIXBA

not attested not anchored not stored refs pending

Spectral variability of ultraluminous X-ray sources

Jari J.E. Kajava, Juri Poutanen (University of Oulu)

arxiv:0809.4634 v1 · 2008-09-26 · astro-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{D2NN4XXM2VMK5HNGE376BQIXBA}

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	2026-05-18T04:33:48.556621Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1e9ade5eecd558ae9da626ffe0c117083da806a1a47f0a08f16cf2be1df1c588

Aliases

arxiv: 0809.4634 · arxiv_version: 0809.4634v1 · doi: 10.48550/arxiv.0809.4634 · pith_short_12: D2NN4XXM2VMK · pith_short_16: D2NN4XXM2VMK5HNG · pith_short_8: D2NN4XXM

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/D2NN4XXM2VMK5HNGE376BQIXBA \
  | 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: 1e9ade5eecd558ae9da626ffe0c117083da806a1a47f0a08f16cf2be1df1c588

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6e2fff7b06be8f01ee9bd355e6e00e6a34a0f4b24963f56f4f21acd7eda763f2",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph",
    "submitted_at": "2008-09-26T14:01:00Z",
    "title_canon_sha256": "a9ca1d0c7ef71f807c0120f359871504cafe117946f1c6cb9a0b47a0d1569043"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0809.4634",
    "kind": "arxiv",
    "version": 1
  }
}