Pith Number

pith:DM6KDHIQ

pith:2025:DM6KDHIQRVQNFEKJLDWTIX7LTJ

not attested not anchored not stored refs pending

Tachyons Before Tachyons: Lev Strum (1890-1936) and Superluminal Velocities

Helge Kragh

arxiv:2504.18347 v1 · 2025-04-25 · physics.hist-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{DM6KDHIQRVQNFEKJLDWTIX7LTJ}

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	2026-07-05T10:54:05.791033Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1b3ca19d108d60d2914958ed345feb9a71ee7dac50c3969fa6e6f8bb01eeb2a2

Aliases

arxiv: 2504.18347 · arxiv_version: 2504.18347v1 · doi: 10.48550/arxiv.2504.18347 · pith_short_12: DM6KDHIQRVQN · pith_short_16: DM6KDHIQRVQNFEKJ · pith_short_8: DM6KDHIQ

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/DM6KDHIQRVQNFEKJLDWTIX7LTJ \
  | 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: 1b3ca19d108d60d2914958ed345feb9a71ee7dac50c3969fa6e6f8bb01eeb2a2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c31572f1e89f182e5c44cdf001dd50fcb943a43e14e2d7724813c4fa2cf81aed",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "physics.hist-ph",
    "submitted_at": "2025-04-25T13:36:41Z",
    "title_canon_sha256": "f4587e53914f7242c48a2e1b9cf13b20bc814dfb59540da0500b837fd20d5f08"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2504.18347",
    "kind": "arxiv",
    "version": 1
  }
}