Pith Number

pith:VHY2PRWG

pith:2013:VHY2PRWGAQQWMC7SFL2CXUG2S4

not attested not anchored not stored refs pending

A Multi-epoch Timing and Spectral Study of the Ultraluminous X-Ray Source NGC 5408 X-1 with XMM-Newton

Dheeraj R. Pasham (UMD), Tod E. Strohmayer (NASA/GSFC)

arxiv:1308.1671 v1 · 2013-08-07 · astro-ph.HE

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{VHY2PRWGAQQWMC7SFL2CXUG2S4}

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	2026-05-18T03:16:28.084421Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a9f1a7c6c60421660bf22af42bd0da971a835aa7d11ee820eba3dc8f65f31147

Aliases

arxiv: 1308.1671 · arxiv_version: 1308.1671v1 · doi: 10.48550/arxiv.1308.1671 · pith_short_12: VHY2PRWGAQQW · pith_short_16: VHY2PRWGAQQWMC7S · pith_short_8: VHY2PRWG

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/VHY2PRWGAQQWMC7SFL2CXUG2S4 \
  | 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: a9f1a7c6c60421660bf22af42bd0da971a835aa7d11ee820eba3dc8f65f31147

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e6da58066ec5bdd76df7544105bfc412ba09b1bfa73b487b1e25da199b8bf90a",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2013-08-07T20:00:03Z",
    "title_canon_sha256": "137548b9c84a14bc6065ff21b02a0f3411d8321a5b091e0ab6deeee59d0d842f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1308.1671",
    "kind": "arxiv",
    "version": 1
  }
}