Pith Number

pith:JH4ALV7U

pith:2017:JH4ALV7UFUALBOTFI2OMEWUDFF

not attested not anchored not stored refs pending

On the Learnability of Programming Language Semantics

(2) University of Exeter), Dan R. Ghica (1), Khulood Alyahya (2) ((1) University of Birmingham

arxiv:1708.02319 v2 · 2017-08-07 · cs.PL

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{JH4ALV7UFUALBOTFI2OMEWUDFF}

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	2026-05-18T00:29:10.412456Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

49f805d7f42d00b0ba65469cc25a83296f20bb2e9b10c23f66d4de2bd9f5a658

Aliases

arxiv: 1708.02319 · arxiv_version: 1708.02319v2 · doi: 10.48550/arxiv.1708.02319 · pith_short_12: JH4ALV7UFUAL · pith_short_16: JH4ALV7UFUALBOTF · pith_short_8: JH4ALV7U

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/JH4ALV7UFUALBOTFI2OMEWUDFF \
  | 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: 49f805d7f42d00b0ba65469cc25a83296f20bb2e9b10c23f66d4de2bd9f5a658

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "dd35d3ed457a2fececada0eb8784b8810a99e61f18beac95251d429085a8bfd2",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.PL",
    "submitted_at": "2017-08-07T22:04:30Z",
    "title_canon_sha256": "a4ad200ed943929062409560690b000fcf7ff000c178ac3f8daa2a5239f175d7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1708.02319",
    "kind": "arxiv",
    "version": 2
  }
}