Pith Number

pith:MD7BTKI4

pith:2026:MD7BTKI4YM7AHFAZL7KBL447D6

not attested not anchored not stored refs pending

A CEFR-Inspired Classification Framework with Fuzzy C-Means To Automate Assessment of Programming Skills in Scratch

Gregorio Robles, Jes\'us M. Gonz\'alez-Barahona, Ricardo Hidalgo-Arag\'on

arxiv:2604.00730 v2 · 2026-04-01 · cs.CY · cs.AI · cs.LG · cs.SE

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{MD7BTKI4YM7AHFAZL7KBL447D6}

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	2026-06-19T16:10:55.218304Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

60fe19a91cc33e0394195fd415f39f1fb1d983190bc2afbc028ff0b44672cad4

Aliases

arxiv: 2604.00730 · arxiv_version: 2604.00730v2 · doi: 10.48550/arxiv.2604.00730 · pith_short_12: MD7BTKI4YM7A · pith_short_16: MD7BTKI4YM7AHFAZ · pith_short_8: MD7BTKI4

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/MD7BTKI4YM7AHFAZL7KBL447D6 \
  | 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: 60fe19a91cc33e0394195fd415f39f1fb1d983190bc2afbc028ff0b44672cad4

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e53ee6e170683b413f64b6b0dea2beeda293ad4484c011d0410cfe775c11638a",
    "cross_cats_sorted": [
      "cs.AI",
      "cs.LG",
      "cs.SE"
    ],
    "license": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
    "primary_cat": "cs.CY",
    "submitted_at": "2026-04-01T10:42:07Z",
    "title_canon_sha256": "22c8d1b5fa1ffc46900630463e2fe2e5513c249604ae0154f448d60c4b935b4e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.00730",
    "kind": "arxiv",
    "version": 2
  }
}