Pith Number

pith:7DRHNXBF

pith:1999:7DRHNXBFCLDJSQJ2XB5H73RJHD

not attested not anchored not stored refs pending

The ALFA Laser: Beam Relay and Control System

A. Eckart, S.Hippler, S. Rabien, T. Ott, W. Hackenberg

arxiv:astro-ph/9911036 v1 · 1999-11-03 · 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{7DRHNXBFCLDJSQJ2XB5H73RJHD}

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	2026-07-04T14:17:17.244777Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f8e276dc2512c699413ab87a7fee2938dddbb92d128aff2d8947ce65ca243083

Aliases

arxiv: astro-ph/9911036 · arxiv_version: astro-ph/9911036v1 · doi: 10.48550/arxiv.astro-ph/9911036 · pith_short_12: 7DRHNXBFCLDJ · pith_short_16: 7DRHNXBFCLDJSQJ2 · pith_short_8: 7DRHNXBF

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/7DRHNXBFCLDJSQJ2XB5H73RJHD \
  | 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: f8e276dc2512c699413ab87a7fee2938dddbb92d128aff2d8947ce65ca243083

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c62adf6234820a1a18d5e1a2aba12d0c1bfa12c6b755042f4701dbc7d0af82e1",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-11-03T13:34:59Z",
    "title_canon_sha256": "56004a7116e51cea76fb4993cbf06be08ffab0742e9a76f17e99ad57c23729fe"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9911036",
    "kind": "arxiv",
    "version": 1
  }
}