Pith Number

pith:IAVDPYYO

pith:2021:IAVDPYYO6TK2LXUG4TXRRPQPGN

not attested not anchored not stored refs pending

Extreme Variability Quasars in Their Various States. I: The sample selection and composite SDSS spectra

Hengxiao Guo, Junxian Wang, Wenke Ren, Zhenyi Cai

arxiv:2111.07057 v1 · 2021-11-13 · astro-ph.GA

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{IAVDPYYO6TK2LXUG4TXRRPQPGN}

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	2026-07-05T03:51:45.596148Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

402a37e30ef4d5a5de86e4ef18be0f33430c1f7aa4b031b8193eb51646a4a6be

Aliases

arxiv: 2111.07057 · arxiv_version: 2111.07057v1 · doi: 10.48550/arxiv.2111.07057 · pith_short_12: IAVDPYYO6TK2 · pith_short_16: IAVDPYYO6TK2LXUG · pith_short_8: IAVDPYYO

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/IAVDPYYO6TK2LXUG4TXRRPQPGN \
  | 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: 402a37e30ef4d5a5de86e4ef18be0f33430c1f7aa4b031b8193eb51646a4a6be

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9f5ff0fe6ca3d74fa048cb58b1ac23ed14ac502bf3c2b8f8666172383d5295e1",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2021-11-13T06:52:26Z",
    "title_canon_sha256": "37d571c64d32e34030bdbd57fa084e0fcd79d784b7067e35cf50caa1625051b5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2111.07057",
    "kind": "arxiv",
    "version": 1
  }
}