Pith Number

pith:W4SIPIR7

pith:2025:W4SIPIR7EWPX7HEEHD6JL63VDE

not attested not anchored not stored refs pending

Delta Activations: A Representation for Finetuned Large Language Models

Amish Sethi, Mayur Naik, Ser-Nam Lim, Zhiqiu Xu

arxiv:2509.04442 v1 · 2025-09-04 · cs.LG · cs.AI · cs.CL · cs.IR

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{W4SIPIR7EWPX7HEEHD6JL63VDE}

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	2026-07-05T12:05:04.825850Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b72487a23f259f7f9c8438fc95fb75190b9a98d51d0f8bd5a500a234b4911925

Aliases

arxiv: 2509.04442 · arxiv_version: 2509.04442v1 · doi: 10.48550/arxiv.2509.04442 · pith_short_12: W4SIPIR7EWPX · pith_short_16: W4SIPIR7EWPX7HEE · pith_short_8: W4SIPIR7

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/W4SIPIR7EWPX7HEEHD6JL63VDE \
  | 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: b72487a23f259f7f9c8438fc95fb75190b9a98d51d0f8bd5a500a234b4911925

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "66ec9a90555740542c5f2147a5f84e07e231791412bc4b59053eb2f5c486dffd",
    "cross_cats_sorted": [
      "cs.AI",
      "cs.CL",
      "cs.IR"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.LG",
    "submitted_at": "2025-09-04T17:59:06Z",
    "title_canon_sha256": "c4f1f6ac286cf8a4f766e2ef58fd60aa86a05a454ddd62745a011c716e72d5eb"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2509.04442",
    "kind": "arxiv",
    "version": 1
  }
}