Pith Number

pith:H24ZDENR

pith:2009:H24ZDENRFZEQC3MAVWTX32VQNL

not attested not anchored not stored refs pending

The Safe Lambda Calculus

C.-H. Luke Ong, William Blum

arxiv:0901.2399 v3 · 2009-01-16 · cs.PL · cs.GT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{H24ZDENRFZEQC3MAVWTX32VQNL}

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	2026-05-18T01:37:40.564756Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3eb99191b12e49016d80ada77deab06ad6b110037ca2024e08fa28fe16bb5c80

Aliases

arxiv: 0901.2399 · arxiv_version: 0901.2399v3 · doi: 10.48550/arxiv.0901.2399 · pith_short_12: H24ZDENRFZEQ · pith_short_16: H24ZDENRFZEQC3MA · pith_short_8: H24ZDENR

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/H24ZDENRFZEQC3MAVWTX32VQNL \
  | 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: 3eb99191b12e49016d80ada77deab06ad6b110037ca2024e08fa28fe16bb5c80

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "889c5f99798870222274b025ea9ee9b8241549a5e168d414061a62d5773c0973",
    "cross_cats_sorted": [
      "cs.GT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.PL",
    "submitted_at": "2009-01-16T05:41:36Z",
    "title_canon_sha256": "87517861d944b39093519d834b1417152e69adc9c0b71f55fc82760d3b9813ad"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0901.2399",
    "kind": "arxiv",
    "version": 3
  }
}