Pith Number

pith:UP25SKTD

pith:2019:UP25SKTD4QORQZXXRCYPEM2YQV

not attested not anchored not stored refs pending

Course Concept Expansion in MOOCs with External Knowledge and Interactive Game

Chenyu Wang, Gan Luo, Jie Tang, Jifan Yu, Juanzi Li, Lei Hou, Zhiyuan Liu

arxiv:1909.07739 v1 · 2019-09-17 · cs.CL · cs.AI

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{UP25SKTD4QORQZXXRCYPEM2YQV}

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	2026-07-05T00:05:17.166726Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a3f5d92a63e41d1866f788b0f23358855e7c591b54faa36a03ab868906f97d5f

Aliases

arxiv: 1909.07739 · arxiv_version: 1909.07739v1 · doi: 10.48550/arxiv.1909.07739 · pith_short_12: UP25SKTD4QOR · pith_short_16: UP25SKTD4QORQZXX · pith_short_8: UP25SKTD

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/UP25SKTD4QORQZXXRCYPEM2YQV \
  | 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: a3f5d92a63e41d1866f788b0f23358855e7c591b54faa36a03ab868906f97d5f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5fffcb06a3a5c65325332ec97a4510d7f9720dad1f336512ded90c84082937ab",
    "cross_cats_sorted": [
      "cs.AI"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.CL",
    "submitted_at": "2019-09-17T12:07:22Z",
    "title_canon_sha256": "0694c720eb208701827b866e3f0144e237bb846e69f6710bfaf6e45fc5030810"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1909.07739",
    "kind": "arxiv",
    "version": 1
  }
}