Pith Number

pith:XMB27NWH

pith:2014:XMB27NWHQZW4AIY6UWQWPZXHN3

not attested not anchored not stored refs pending

Extending Item Response Theory to Online Homework

Gerd Kortemeyer

arxiv:1401.1702 v1 · 2014-01-08 · 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{XMB27NWHQZW4AIY6UWQWPZXHN3}

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	2026-05-18T02:50:59.523533Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

bb03afb6c7866dc0231ea5a167e6e76ef8436790a5dc10bfea958ddb679335c3

Aliases

arxiv: 1401.1702 · arxiv_version: 1401.1702v1 · doi: 10.48550/arxiv.1401.1702 · pith_short_12: XMB27NWHQZW4 · pith_short_16: XMB27NWHQZW4AIY6 · pith_short_8: XMB27NWH

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/XMB27NWHQZW4AIY6UWQWPZXHN3 \
  | 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: bb03afb6c7866dc0231ea5a167e6e76ef8436790a5dc10bfea958ddb679335c3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ace45c99a69c2d05f3543499205aa5f49a1fe1c96db785dde6e894ad19212601",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.ed-ph",
    "submitted_at": "2014-01-08T13:57:24Z",
    "title_canon_sha256": "69dc341d062b957a56f87ef9f0a62e61e1b97866e78f7f3e99dcc328cfb53e44"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1401.1702",
    "kind": "arxiv",
    "version": 1
  }
}