Pith Number

pith:WE7XFPZT

pith:2025:WE7XFPZTLEJ7UXT6B4IDLDP2W5

not attested not anchored not stored refs pending

We're Still Doing It (All) Wrong: Recommender Systems, Fifteen Years Later

Alan Said, Maria Soledad Pera, Michael D. Ekstrand

arxiv:2509.09414 v1 · 2025-09-11 · cs.IR · 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{WE7XFPZTLEJ7UXT6B4IDLDP2W5}

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.

Cited by

1 paper in Pith

What Do Humanities Scholars Need? A User Model for Recommendation in Digital Archives

Receipt and verification

First computed	2026-07-05T12:09:35.691676Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b13f72bf335913fa5e7e0f10358dfab74558ed5434956cd4253cabbe6421ca6e

Aliases

arxiv: 2509.09414 · arxiv_version: 2509.09414v1 · doi: 10.48550/arxiv.2509.09414 · pith_short_12: WE7XFPZTLEJ7 · pith_short_16: WE7XFPZTLEJ7UXT6 · pith_short_8: WE7XFPZT

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/WE7XFPZTLEJ7UXT6B4IDLDP2W5 \
  | 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: b13f72bf335913fa5e7e0f10358dfab74558ed5434956cd4253cabbe6421ca6e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b6bbcbdccbaedc3463af9ca6d4a10c44524f83bccafd83e5850b1278ff642d4e",
    "cross_cats_sorted": [
      "cs.AI"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.IR",
    "submitted_at": "2025-09-11T12:51:37Z",
    "title_canon_sha256": "9beb7090a709f837a4987236be7a1e7ddf821373251a32e1cdc9a6201c6547a5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2509.09414",
    "kind": "arxiv",
    "version": 1
  }
}