Pith Number

pith:QQ2PAZ7A

pith:2018:QQ2PAZ7AYNV5H2AGYHGRDHTDO3

not attested not anchored not stored refs pending

The Complicated Evolution of the ACIS Contamination Layer over the Mission Life of the Chandra X-ray Observatory

Akos Bogdan, Herman L. Marshall, Neil W. Tice, Paul P. Plucinsky

arxiv:1809.02225 v1 · 2018-09-06 · astro-ph.IM · 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{QQ2PAZ7AYNV5H2AGYHGRDHTDO3}

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	2026-05-18T00:06:17.632643Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8434f067e0c36bd3e806c1cd119e6376e8b6a45d74e83a36410d6c954e296fa9

Aliases

arxiv: 1809.02225 · arxiv_version: 1809.02225v1 · doi: 10.48550/arxiv.1809.02225 · pith_short_12: QQ2PAZ7AYNV5 · pith_short_16: QQ2PAZ7AYNV5H2AG · pith_short_8: QQ2PAZ7A

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/QQ2PAZ7AYNV5H2AGYHGRDHTDO3 \
  | 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: 8434f067e0c36bd3e806c1cd119e6376e8b6a45d74e83a36410d6c954e296fa9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8647e79d6cf85e3e201227bacd5a0ee7826432453a957b4578a5a37f5182d9de",
    "cross_cats_sorted": [
      "astro-ph.HE"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2018-09-06T21:29:59Z",
    "title_canon_sha256": "4e342233df848c9a4698219452d863b450284062386ad27daa6236a204ea9ec5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1809.02225",
    "kind": "arxiv",
    "version": 1
  }
}