Pith Number

pith:AVQSLVQR

pith:2026:AVQSLVQREABUBT2V3ZYXTDDF7Q

not attested not anchored not stored refs pending

A Scalable Parametric Item Calibration Engine (SPICE) for Explanatory IRT with Sparse Data

J.R. Lockwood, Manqian Liao, Steven W. Nydick

arxiv:2605.21782 v1 · 2026-05-20 · stat.ME · stat.AP · stat.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{AVQSLVQREABUBT2V3ZYXTDDF7Q}

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	2026-05-22T01:03:32.316646Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

056125d611200340cf55de71798c65fc164c974872462d6e88df1b5d646735b7

Aliases

arxiv: 2605.21782 · arxiv_version: 2605.21782v1 · doi: 10.48550/arxiv.2605.21782 · pith_short_12: AVQSLVQREABU · pith_short_16: AVQSLVQREABUBT2V · pith_short_8: AVQSLVQR

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/AVQSLVQREABUBT2V3ZYXTDDF7Q \
  | 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: 056125d611200340cf55de71798c65fc164c974872462d6e88df1b5d646735b7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "41d851e01fa352bb90a456204a13e7d8c30d8f89931380f31eaa3c5884c99a7a",
    "cross_cats_sorted": [
      "stat.AP",
      "stat.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "stat.ME",
    "submitted_at": "2026-05-20T22:22:06Z",
    "title_canon_sha256": "5fe220cc065d876cd28612e14c9030e78ba20f3b45950ed2a813fb341586b4ed"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.21782",
    "kind": "arxiv",
    "version": 1
  }
}