Pith Number

pith:5U7J57YV

pith:2018:5U7J57YVFS42KMLO7BIP4JRU5J

not attested not anchored not stored refs pending

Investigation of Skyscraper's Feat (original version with an addendum)

Costas Efthimiou

arxiv:1805.09643 v1 · 2018-05-18 · physics.pop-ph · physics.ed-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{5U7J57YVFS42KMLO7BIP4JRU5J}

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	2026-05-18T00:15:03.285748Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ed3e9eff152cb9a5316ef850fe2634ea4fe9a659b43623b2694034eec8cafdd5

Aliases

arxiv: 1805.09643 · arxiv_version: 1805.09643v1 · doi: 10.48550/arxiv.1805.09643 · pith_short_12: 5U7J57YVFS42 · pith_short_16: 5U7J57YVFS42KMLO · pith_short_8: 5U7J57YV

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/5U7J57YVFS42KMLO7BIP4JRU5J \
  | 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: ed3e9eff152cb9a5316ef850fe2634ea4fe9a659b43623b2694034eec8cafdd5

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b8e6e7382ad1e7a45e9f4c373a0c570a44a2593196158a1e9b7bc49d4220681e",
    "cross_cats_sorted": [
      "physics.ed-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.pop-ph",
    "submitted_at": "2018-05-18T14:11:19Z",
    "title_canon_sha256": "376738b223fbd0cef74d2eb5d8d2c0ba64826260ad7d712623e89a98ded529c9"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1805.09643",
    "kind": "arxiv",
    "version": 1
  }
}