Pith Number

pith:ETU4U4EH

pith:2018:ETU4U4EHKQLUVP4B5F43HO4G7B

not attested not anchored not stored refs pending

Inferring Concept Prerequisite Relations from Online Educational Resources

Meghana Madhyastha, Sheril Lawrence, Sudeshna Roy, Vaibhav Rajan

arxiv:1811.12640 v2 · 2018-11-30 · cs.CL · cs.AI · cs.LG · stat.ML

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{ETU4U4EHKQLUVP4B5F43HO4G7B}

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	2026-05-17T23:55:42.413134Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

24e9ca708754174abf81e979b3bb86f84ffc33ebed54ae82163b1d7e8da3ad02

Aliases

arxiv: 1811.12640 · arxiv_version: 1811.12640v2 · doi: 10.48550/arxiv.1811.12640 · pith_short_12: ETU4U4EHKQLU · pith_short_16: ETU4U4EHKQLUVP4B · pith_short_8: ETU4U4EH

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/ETU4U4EHKQLUVP4B5F43HO4G7B \
  | 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: 24e9ca708754174abf81e979b3bb86f84ffc33ebed54ae82163b1d7e8da3ad02

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3d341488181abcf2c7c6ed2cbca1f52e6ee52faa71a2a31db14f26440c2ad62a",
    "cross_cats_sorted": [
      "cs.AI",
      "cs.LG",
      "stat.ML"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CL",
    "submitted_at": "2018-11-30T06:55:20Z",
    "title_canon_sha256": "bb801c7c216f3655153b769cfd91363c754ca57c206c5f8fed5ba3a9c5edbf97"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1811.12640",
    "kind": "arxiv",
    "version": 2
  }
}