Pith Number

pith:7RF6GU46

pith:2026:7RF6GU46LXF6CIVKP3KUPYSG5I

not attested not anchored not stored refs pending

Persistent Sparse Autoencoders: Learning Feature Timescales in Language Models

Haoyan Luo, Mateja Jamnik, Mateo Espinosa Zarlenga

arxiv:2607.17117 v1 · 2026-07-19 · cs.LG · cs.CL

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{7RF6GU46LXF6CIVKP3KUPYSG5I}

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	2026-07-21T01:21:16.568811Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fc4be3539e5dcbe122aa7ed547e246ea35c1687eb0f5caa4a65ddb617866c145

Aliases

arxiv: 2607.17117 · arxiv_version: 2607.17117v1 · doi: 10.48550/arxiv.2607.17117 · pith_short_12: 7RF6GU46LXF6 · pith_short_16: 7RF6GU46LXF6CIVK · pith_short_8: 7RF6GU46

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/7RF6GU46LXF6CIVKP3KUPYSG5I \
  | 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: fc4be3539e5dcbe122aa7ed547e246ea35c1687eb0f5caa4a65ddb617866c145

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b5ecd4d50d3585f728814ffa90f287694687787926522658a6984c77b77c4bf6",
    "cross_cats_sorted": [
      "cs.CL"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.LG",
    "submitted_at": "2026-07-19T08:07:32Z",
    "title_canon_sha256": "8f01a8c319f3cc08e8e72653e065b91b7d2028e4fb42dd951330b7c5be3324c1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2607.17117",
    "kind": "arxiv",
    "version": 1
  }
}