Pith Number

pith:2WNFOSBE

pith:2012:2WNFOSBEA7EEX5VY644DNUTNRR

not attested not anchored not stored refs pending

The 2200 A bump and the UV extinction curve

Frederic Zagury

arxiv:1209.0014 v1 · 2012-08-31 · 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{2WNFOSBEA7EEX5VY644DNUTNRR}

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	2026-05-18T01:54:48.806244Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d59a57482407c84bf6b8f73836d26d8c7350f43317dbc16b5dde65055c0dfb6f

Aliases

arxiv: 1209.0014 · arxiv_version: 1209.0014v1 · doi: 10.48550/arxiv.1209.0014 · pith_short_12: 2WNFOSBEA7EE · pith_short_16: 2WNFOSBEA7EEX5VY · pith_short_8: 2WNFOSBE

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/2WNFOSBEA7EEX5VY644DNUTNRR \
  | 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: d59a57482407c84bf6b8f73836d26d8c7350f43317dbc16b5dde65055c0dfb6f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "04b3e074ed8ce85b1eddab4eece0094c97126de4c816ec6fd8c9c222ceb07bf0",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2012-08-31T20:51:19Z",
    "title_canon_sha256": "3b552bb0437b2aac77d4293a0f38ff7758e2520c99a307054983ebc142edfa9f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1209.0014",
    "kind": "arxiv",
    "version": 1
  }
}