Pith Number

pith:IDJB3KLH

pith:2018:IDJB3KLHNKH6MAGBOGOEDBOTM2

not attested not anchored not stored refs pending

Experiments with Universal CEFR Classification

Sowmya Vajjala, Taraka Rama

arxiv:1804.06636 v1 · 2018-04-18 · cs.CL

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{IDJB3KLHNKH6MAGBOGOEDBOTM2}

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	2026-05-18T00:18:06.165455Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

40d21da9676a8fe600c1719c4185d36696eb3d12617359b25a7f861d39189ce7

Aliases

arxiv: 1804.06636 · arxiv_version: 1804.06636v1 · doi: 10.48550/arxiv.1804.06636 · pith_short_12: IDJB3KLHNKH6 · pith_short_16: IDJB3KLHNKH6MAGB · pith_short_8: IDJB3KLH

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/IDJB3KLHNKH6MAGBOGOEDBOTM2 \
  | 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: 40d21da9676a8fe600c1719c4185d36696eb3d12617359b25a7f861d39189ce7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9230691e8470ad2b541eb13af2bc6962c71ce4b5d6b976125eceb5166dbe8741",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CL",
    "submitted_at": "2018-04-18T10:33:47Z",
    "title_canon_sha256": "8f7d2243a45c6c55aba0a9b48d05e36b7ba6f776634d4f4aeaf0235616be7272"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1804.06636",
    "kind": "arxiv",
    "version": 1
  }
}