Pith Number

pith:NUDXUR2F

pith:2008:NUDXUR2FECH5BMBHISIIWZAYRK

not attested not anchored not stored refs pending

Prospects for a Nuclear Optical Frequency Standard based on Thorium-229

Chr. Tamm, E. Peik, K. Zimmermann, M. Okhapkin

arxiv:0812.3548 v2 · 2008-12-18 · physics.optics

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{NUDXUR2FECH5BMBHISIIWZAYRK}

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	2026-05-18T00:37:23.331692Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6d077a4745208fd0b02744908b64188ab594e427566bf6caf08cd115a6d72332

Aliases

arxiv: 0812.3548 · arxiv_version: 0812.3548v2 · doi: 10.48550/arxiv.0812.3548 · pith_short_12: NUDXUR2FECH5 · pith_short_16: NUDXUR2FECH5BMBH · pith_short_8: NUDXUR2F

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/NUDXUR2FECH5BMBHISIIWZAYRK \
  | 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: 6d077a4745208fd0b02744908b64188ab594e427566bf6caf08cd115a6d72332

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0bb318f872f23809b1a3d0de06123903415ab47c33875898b11fca48a6c5ad4e",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.optics",
    "submitted_at": "2008-12-18T14:45:56Z",
    "title_canon_sha256": "e7adda0c72a5be853dc54eb6ff86d981962abda2882636a42e462da01176025f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0812.3548",
    "kind": "arxiv",
    "version": 2
  }
}