Pith Number

pith:EEMDP2ND

pith:2019:EEMDP2ND4ZQGAIXQ6D3PNU44EH

not attested not anchored not stored refs pending

The first high-redshift changing-look quasars

Barry McKernan, Daniel Stern, Giorgio Calderone, K. E. Saavik Ford, Matthew J. Graham, Nicholas P. Ross

arxiv:1912.05310 v1 · 2019-12-11 · 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{EEMDP2ND4ZQGAIXQ6D3PNU44EH}

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	2026-07-05T01:33:34.733550Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

211837e9a3e6606022f0f0f6f6d39c21d482f9bc259a03a226090ddc41618851

Aliases

arxiv: 1912.05310 · arxiv_version: 1912.05310v1 · doi: 10.48550/arxiv.1912.05310 · pith_short_12: EEMDP2ND4ZQG · pith_short_16: EEMDP2ND4ZQGAIXQ · pith_short_8: EEMDP2ND

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/EEMDP2ND4ZQGAIXQ6D3PNU44EH \
  | 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: 211837e9a3e6606022f0f0f6f6d39c21d482f9bc259a03a226090ddc41618851

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "dfaa63086f3795ebabd1f58ef516a9478d9326930003de9fb9004d7ae9305899",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2019-12-11T13:52:33Z",
    "title_canon_sha256": "1c1205e58ca955679dacceba514de1a7231304cf857a7890e95d3e7687fbc26e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1912.05310",
    "kind": "arxiv",
    "version": 1
  }
}