Pith Number

pith:4ULWHDCH

pith:2011:4ULWHDCHKJBA7SFX7SQSMKPOX2

not attested not anchored not stored refs pending

Swift J1644+57: An Ultra-Luminous X-ray Event

Aristotle Socrates

arxiv:1105.2557 v2 · 2011-05-12 · 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{4ULWHDCHKJBA7SFX7SQSMKPOX2}

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	2026-05-18T02:01:58.955948Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e517638c4752420fc8b7fca12629eebe8beecc164f4c2a41c3468e95b15502f4

Aliases

arxiv: 1105.2557 · arxiv_version: 1105.2557v2 · doi: 10.48550/arxiv.1105.2557 · pith_short_12: 4ULWHDCHKJBA · pith_short_16: 4ULWHDCHKJBA7SFX · pith_short_8: 4ULWHDCH

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/4ULWHDCHKJBA7SFX7SQSMKPOX2 \
  | 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: e517638c4752420fc8b7fca12629eebe8beecc164f4c2a41c3468e95b15502f4

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d9a4a042eaef25936264b5ffbf6f03de196ef9ada5705f84042b3c070a8f2583",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2011-05-12T19:56:33Z",
    "title_canon_sha256": "1b02802f4381a50c28fe8a4764717f1b6300e438ba966a80c05b04f627adeece"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1105.2557",
    "kind": "arxiv",
    "version": 2
  }
}