Pith Number

pith:QNJZUKOE

pith:2019:QNJZUKOEV3XXXS4B4QMFLGBAV5

not attested not anchored not stored refs pending

Network analyses of student engagement with on-line textbook problems

Jesper Bruun, Linda Udby, Pia J. Ray

arxiv:1903.11390 v1 · 2019-03-27 · 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{QNJZUKOEV3XXXS4B4QMFLGBAV5}

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	2026-05-17T23:50:03.407669Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

83539a29c4aeef7bcb81e418559820af675a2e8b467c9e20d4390cbff3819ee0

Aliases

arxiv: 1903.11390 · arxiv_version: 1903.11390v1 · doi: 10.48550/arxiv.1903.11390 · pith_short_12: QNJZUKOEV3XX · pith_short_16: QNJZUKOEV3XXXS4B · pith_short_8: QNJZUKOE

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/QNJZUKOEV3XXXS4B4QMFLGBAV5 \
  | 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: 83539a29c4aeef7bcb81e418559820af675a2e8b467c9e20d4390cbff3819ee0

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6018f4482a93944727c5e57f867094a2d4034c68cec3839ab4039e80ab32764b",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.ed-ph",
    "submitted_at": "2019-03-27T12:46:36Z",
    "title_canon_sha256": "7dfae903d50ca0031d65e6320ebe0a218bbb4ee3b712579303f4cb34d0ced30c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1903.11390",
    "kind": "arxiv",
    "version": 1
  }
}