Pith Number

pith:27NCALQE

pith:2013:27NCALQEQZTVVPKKDVHNVNUKLO

not attested not anchored not stored refs pending

The Initial State of Students Taking an Introductory Physics MOOC

Brian D. Thoms, Edwin F. Greco, John M. Aiken, Marcos D. Caballero, Michael F. Schatz, Scott S. Douglas, Shih-Yin Lin

arxiv:1307.2533 v2 · 2013-07-09 · 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{27NCALQEQZTVVPKKDVHNVNUKLO}

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	2026-05-18T03:13:23.288517Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d7da202e0486675abd4a1d4edab68a5b88a07eae0ff88a1e72ecf639210566d0

Aliases

arxiv: 1307.2533 · arxiv_version: 1307.2533v2 · doi: 10.48550/arxiv.1307.2533 · pith_short_12: 27NCALQEQZTV · pith_short_16: 27NCALQEQZTVVPKK · pith_short_8: 27NCALQE

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/27NCALQEQZTVVPKKDVHNVNUKLO \
  | 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: d7da202e0486675abd4a1d4edab68a5b88a07eae0ff88a1e72ecf639210566d0

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4005fa0b2d251590bac523d8fca0bb41bf65ce3d91b6c409a9cf02c0a1782575",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.ed-ph",
    "submitted_at": "2013-07-09T18:19:36Z",
    "title_canon_sha256": "72bb35b6ab0df3f975cce325336fbdf8bfb1446886ea0d4366c87f11cbc8ac9b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1307.2533",
    "kind": "arxiv",
    "version": 2
  }
}