Pith Number

pith:667VXA6R

pith:2013:667VXA6RXUAHC5AX2LVTRKWYBM

not attested not anchored not stored refs pending

Grading by Category: A simple method for providing students with meaningful feedback on exams in large courses

Brenda Weiss, Cassandra Paul, Wendell H. Potter

arxiv:1304.0222 v2 · 2013-03-31 · physics.ed-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{667VXA6RXUAHC5AX2LVTRKWYBM}

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	2026-05-18T01:50:50.675060Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f7bf5b83d1bd00717417d2eb38aad80b3ac23e4077259681217e9881a6e4afdb

Aliases

arxiv: 1304.0222 · arxiv_version: 1304.0222v2 · doi: 10.48550/arxiv.1304.0222 · pith_short_12: 667VXA6RXUAH · pith_short_16: 667VXA6RXUAHC5AX · pith_short_8: 667VXA6R

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/667VXA6RXUAHC5AX2LVTRKWYBM \
  | 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: f7bf5b83d1bd00717417d2eb38aad80b3ac23e4077259681217e9881a6e4afdb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a16a3c18682031ddefec97e0fd9894bf19854296bbbea028f9ccfc7de200c86d",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.ed-ph",
    "submitted_at": "2013-03-31T16:25:32Z",
    "title_canon_sha256": "cabf40975826ba38c989b2c129127f74bdf40ce32e23cb62dadb72b9e6df6784"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1304.0222",
    "kind": "arxiv",
    "version": 2
  }
}