Pith Number

pith:62PS5SNF

pith:2004:62PS5SNFO6NGDW7AGTH47WVEWA

not attested not anchored not stored refs pending

Colour changes in quasar light curves

M.R.S. Hawkins

arxiv:astro-ph/0406161 v1 · 2004-06-07 · 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{62PS5SNFO6NGDW7AGTH47WVEWA}

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	2026-05-18T01:40:37.007271Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f69f2ec9a5779a61dbe034cfcfdaa4b00d9d5be1a604595a6952e0bb3cd6b79e

Aliases

arxiv: astro-ph/0406161 · arxiv_version: astro-ph/0406161v1 · doi: 10.48550/arxiv.astro-ph/0406161 · pith_short_12: 62PS5SNFO6NG · pith_short_16: 62PS5SNFO6NGDW7A · pith_short_8: 62PS5SNF

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/62PS5SNFO6NGDW7AGTH47WVEWA \
  | 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: f69f2ec9a5779a61dbe034cfcfdaa4b00d9d5be1a604595a6952e0bb3cd6b79e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7dd7fb21632207a03263da42be807aa2aadc854ddc0d94d0b6abff42e0bdd418",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2004-06-07T12:37:47Z",
    "title_canon_sha256": "223bacc77328906219a1aeb3ab7b68edba4d65f6cb580ea3ccaa767cdbdcb30d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0406161",
    "kind": "arxiv",
    "version": 1
  }
}