Pith Number

pith:QRWU2UQE

pith:2016:QRWU2UQEZ7B7LCATFWHH3SUFLT

not attested not anchored not stored refs pending

The optical variability of SDSS quasars from multi-epoch spectroscopy. II. color variation

Hengxiao Guo, Minfeng Gu

arxiv:1603.06876 v2 · 2016-03-22 · astro-ph.GA · astro-ph.CO · 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{QRWU2UQEZ7B7LCATFWHH3SUFLT}

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	2026-05-18T01:13:53.794014Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

846d4d5204cfc3f588132d8e7dca855cf5d72192dddafcc3f899550306ed4782

Aliases

arxiv: 1603.06876 · arxiv_version: 1603.06876v2 · doi: 10.48550/arxiv.1603.06876 · pith_short_12: QRWU2UQEZ7B7 · pith_short_16: QRWU2UQEZ7B7LCAT · pith_short_8: QRWU2UQE

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/QRWU2UQEZ7B7LCATFWHH3SUFLT \
  | 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: 846d4d5204cfc3f588132d8e7dca855cf5d72192dddafcc3f899550306ed4782

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ff7cb0bae5897dbcd87b9bcfdf360dcc83d5f2b4a5368358d64cf290c00834d4",
    "cross_cats_sorted": [
      "astro-ph.CO",
      "astro-ph.HE"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2016-03-22T17:15:07Z",
    "title_canon_sha256": "e2f601cc8e7e907bc6d094a1211a2d85214e84e6a58ec91db1a308fb99b4f210"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1603.06876",
    "kind": "arxiv",
    "version": 2
  }
}