Pith Number

pith:QHHTIZ5V

pith:2021:QHHTIZ5VJ6QBVUR2OP3CFFEAIG

not attested not anchored not stored refs pending

The Changing Look Blazar B2 1420+32

Aaron Do, Anna V. Payne, Benjamin J. Shappee, Christopher S. Kochanek, Cora DeFrancesco, David Bersier, Enwei Liang, Hora D. Mishra, Jigui Cheng, John Cox, Jose Prieto, Junfeng Wang, K.Z. Stanek, Mark E. Huber, Michael A. Tucker, Patrick J. Vallely, Ping Chen, Saloni Bhatiani, Subhash Bose, Subo Dong, Thomas W. S. Holoien, T. Jayasinghe, Todd A. Thompson, Xinyu Dai, Zhiqiang Shen

arxiv:2103.08707 v1 · 2021-03-15 · astro-ph.HE · 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{QHHTIZ5VJ6QBVUR2OP3CFFEAIG}

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	2026-07-05T02:51:20.394557Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

81cf3467b54fa01ad23a73f622948041af7d158875da0147f48f876405f0e9ea

Aliases

arxiv: 2103.08707 · arxiv_version: 2103.08707v1 · doi: 10.48550/arxiv.2103.08707 · pith_short_12: QHHTIZ5VJ6QB · pith_short_16: QHHTIZ5VJ6QBVUR2 · pith_short_8: QHHTIZ5V

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/QHHTIZ5VJ6QBVUR2OP3CFFEAIG \
  | 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: 81cf3467b54fa01ad23a73f622948041af7d158875da0147f48f876405f0e9ea

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8557d09f4042d51e6a55528e4a65ce67705832ddeaa1b6d17832c543ae66c6e7",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2021-03-15T20:40:32Z",
    "title_canon_sha256": "753829d02c9934a25323ea95bdaded332a8d891bc3f765a800327acf7dbcabd3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2103.08707",
    "kind": "arxiv",
    "version": 1
  }
}