Pith Number

pith:K7RXHK2B

pith:2012:K7RXHK2BWT7VD77N2R62ZYWF4J

not attested not anchored not stored refs pending

Combined constraints on intergalactic dust from quasar colours and the soft X-ray background

Edvard Mortsell, Joel Johansson

arxiv:1209.0553 v1 · 2012-09-04 · 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{K7RXHK2BWT7VD77N2R62ZYWF4J}

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	2026-05-18T01:54:47.637411Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

57e373ab41b4ff51ffedd47dace2c5e26689fa0d409a075a26fb4b0e94335e36

Aliases

arxiv: 1209.0553 · arxiv_version: 1209.0553v1 · doi: 10.48550/arxiv.1209.0553 · pith_short_12: K7RXHK2BWT7V · pith_short_16: K7RXHK2BWT7VD77N · pith_short_8: K7RXHK2B

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/K7RXHK2BWT7VD77N2R62ZYWF4J \
  | 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: 57e373ab41b4ff51ffedd47dace2c5e26689fa0d409a075a26fb4b0e94335e36

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9c9de7b46c185fd8b5debcfcc6032f16776491bbc7d27f12b952c30da6179918",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2012-09-04T07:48:01Z",
    "title_canon_sha256": "1fb9c9e418e9c972faa718773566d3912363e57c0a38337292591b5dd70c902e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1209.0553",
    "kind": "arxiv",
    "version": 1
  }
}