Pith Number

pith:ECQHC2HT

pith:2012:ECQHC2HTSYCBTZW5XD3UKRWG6J

not attested not anchored not stored refs pending

Optical spectroscopy of the gamma-ray bright blazars PKS 0447-439 and PMN J0630-24

Hermine Landt (Durham University, UK)

arxiv:1203.4959 v1 · 2012-03-22 · astro-ph.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{ECQHC2HTSYCBTZW5XD3UKRWG6J}

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	2026-05-18T01:58:04.643565Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

20a07168f3960419e6ddb8f74546c6f24c48fc0cabf56c32e7b7b40027bdac4b

Aliases

arxiv: 1203.4959 · arxiv_version: 1203.4959v1 · doi: 10.48550/arxiv.1203.4959 · pith_short_12: ECQHC2HTSYCB · pith_short_16: ECQHC2HTSYCBTZW5 · pith_short_8: ECQHC2HT

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/ECQHC2HTSYCBTZW5XD3UKRWG6J \
  | 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: 20a07168f3960419e6ddb8f74546c6f24c48fc0cabf56c32e7b7b40027bdac4b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "347f1edbf6dd2207ab60ed468067fb657e58b13846929c026e6fd29ed276e57d",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2012-03-22T10:56:22Z",
    "title_canon_sha256": "541c72b4cd3531c6f7aea75aeccf7e488a4546ee7eb601ef789b56c1790ec779"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1203.4959",
    "kind": "arxiv",
    "version": 1
  }
}