Pith Number

pith:W6LPVVBN

pith:1999:W6LPVVBN4KHZBC5I5TFDYJN7LS

not attested not anchored not stored refs pending

HST-FOS Observations of M87: Ly-a Emission from the Active Galactic Nucleus

Claude R. Canizares (MIT), Kenneth R. Sembach (JHU), Ravi Sankrit

arxiv:astro-ph/9907406 v1 · 1999-07-28 · astro-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{W6LPVVBN4KHZBC5I5TFDYJN7LS}

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	2026-05-18T01:32:58.198497Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b796fad42de28f908ba8ecca3c25bf5c8e7b0f24550979f6e245c2013d7645cf

Aliases

arxiv: astro-ph/9907406 · arxiv_version: astro-ph/9907406v1 · doi: 10.48550/arxiv.astro-ph/9907406 · pith_short_12: W6LPVVBN4KHZ · pith_short_16: W6LPVVBN4KHZBC5I · pith_short_8: W6LPVVBN

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/W6LPVVBN4KHZBC5I5TFDYJN7LS \
  | 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: b796fad42de28f908ba8ecca3c25bf5c8e7b0f24550979f6e245c2013d7645cf

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f874ec7d4792195f2d97cfb7dd00b1b0ca4ddcff4e4a4928b375e373c344474d",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-07-28T20:41:15Z",
    "title_canon_sha256": "31322b4c802810d4e958d1a5c0f0596291a7cfa41e691b46b9cb9d1e6e97b1b1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9907406",
    "kind": "arxiv",
    "version": 1
  }
}