Pith Number

pith:4T55SYMH

pith:2018:4T55SYMHJ2LADWGLM3D2VT5YLK

not attested not anchored not stored refs pending

The variability of the warm absorber in I Zwicky 1 as seen by XMM-Newton

C. V. Silva, D. R. Wilkins, E. Costantini, G. A. Kriss, L. C. Gallo, M. Giustini, W. N. Brandt

arxiv:1807.07294 v1 · 2018-07-19 · astro-ph.GA · 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{4T55SYMHJ2LADWGLM3D2VT5YLK}

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	2026-05-18T00:09:23.869726Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e4fbd961874e9601d8cb66c7aacfb85abf5ab79bb3e91bcc5d69bd22998222f6

Aliases

arxiv: 1807.07294 · arxiv_version: 1807.07294v1 · doi: 10.48550/arxiv.1807.07294 · pith_short_12: 4T55SYMHJ2LA · pith_short_16: 4T55SYMHJ2LADWGL · pith_short_8: 4T55SYMH

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/4T55SYMHJ2LADWGLM3D2VT5YLK \
  | 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: e4fbd961874e9601d8cb66c7aacfb85abf5ab79bb3e91bcc5d69bd22998222f6

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "90a122250dff50babea215dc199ddc709f0a1f7917858fb5c804e3008d04e137",
    "cross_cats_sorted": [
      "astro-ph.HE"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2018-07-19T08:52:04Z",
    "title_canon_sha256": "2ec1aaeae431d85845bedf4c4b83027ce711f313063cd5bcbd9aa51eada9d073"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1807.07294",
    "kind": "arxiv",
    "version": 1
  }
}