Pith Number

pith:7KIZ2JGV

pith:2009:7KIZ2JGVJXHBKZO55IGDQ5SDL7

not attested not anchored not stored refs pending

Unpublished opening lecture for the course on the theory of relativity in Argentina, 1925

Albert Einstein, Alejandro Gangui, Eduardo L. Ortiz

arxiv:0903.2401 v1 · 2009-03-13 · physics.hist-ph · astro-ph.CO · gr-qc · physics.soc-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{7KIZ2JGVJXHBKZO55IGDQ5SDL7}

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	2026-05-18T00:05:08.323187Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fa919d24d54dce1565ddea0c3876435fd8edbdd191c9a1c74eda1fc356c8c6ed

Aliases

arxiv: 0903.2401 · arxiv_version: 0903.2401v1 · doi: 10.48550/arxiv.0903.2401 · pith_short_12: 7KIZ2JGVJXHB · pith_short_16: 7KIZ2JGVJXHBKZO5 · pith_short_8: 7KIZ2JGV

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/7KIZ2JGVJXHBKZO55IGDQ5SDL7 \
  | 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: fa919d24d54dce1565ddea0c3876435fd8edbdd191c9a1c74eda1fc356c8c6ed

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e44b7dd05ee8c82bb8f133bdfede227f6bd6d36fc30d13af0c11e88d25aac717",
    "cross_cats_sorted": [
      "astro-ph.CO",
      "gr-qc",
      "physics.soc-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.hist-ph",
    "submitted_at": "2009-03-13T13:05:54Z",
    "title_canon_sha256": "8fdd55e04d49e114eab3487e5fa00995428cdac7753c5cc694b1421e51a88e73"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0903.2401",
    "kind": "arxiv",
    "version": 1
  }
}