Pith Number

pith:6KZ4CM4Q

pith:2013:6KZ4CM4QNW775XTZUNFG3PBBOA

not attested not anchored not stored refs pending

Optical selection of quasars: SDSS and LSST

Chelsea L. MacLeod, Gordon T. Richards, Peter Yoachim, W. Niel Brandt, Xiaohui Fan, Zeljko Ivezic

arxiv:1312.3963 v1 · 2013-12-13 · 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{6KZ4CM4QNW775XTZUNFG3PBBOA}

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	2026-05-18T01:45:50.559230Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f2b3c133906dbffede79a34a6dbc217020f625dbebcfaa51ed91e017f4a9ee84

Aliases

arxiv: 1312.3963 · arxiv_version: 1312.3963v1 · doi: 10.48550/arxiv.1312.3963 · pith_short_12: 6KZ4CM4QNW77 · pith_short_16: 6KZ4CM4QNW775XTZ · pith_short_8: 6KZ4CM4Q

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/6KZ4CM4QNW775XTZUNFG3PBBOA \
  | 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: f2b3c133906dbffede79a34a6dbc217020f625dbebcfaa51ed91e017f4a9ee84

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "176ff037a582b511ea09d9cf738a345719a96c86d1e6f25bc4d0ccb8e0a474cb",
    "cross_cats_sorted": [
      "astro-ph.HE"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2013-12-13T21:39:11Z",
    "title_canon_sha256": "0db1d975b5fbab1c1a888546d78eaef66e0c9c24ef99458404d056ce2d190212"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1312.3963",
    "kind": "arxiv",
    "version": 1
  }
}