Pith Number

pith:NBUNIPN6

pith:2025:NBUNIPN6X4WDHZM2VTKFQ6UMEY

not attested not anchored not stored refs pending

Prediction of Apophis's deformation-driven rotational evolution during its closest encounter to the Earth in 2029

Masatoshi Hirabayashi

arxiv:2507.17710 v1 · 2025-07-23 · astro-ph.EP

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{NBUNIPN6X4WDHZM2VTKFQ6UMEY}

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	2026-07-05T11:42:17.162748Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6868d43dbebf2c33e59aacd4587a8c2612fe2e5a1f494080b86c1c247fa58ba8

Aliases

arxiv: 2507.17710 · arxiv_version: 2507.17710v1 · doi: 10.48550/arxiv.2507.17710 · pith_short_12: NBUNIPN6X4WD · pith_short_16: NBUNIPN6X4WDHZM2 · pith_short_8: NBUNIPN6

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/NBUNIPN6X4WDHZM2VTKFQ6UMEY \
  | 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: 6868d43dbebf2c33e59aacd4587a8c2612fe2e5a1f494080b86c1c247fa58ba8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "eab2ad6a80908aa3108d25ccb59726bc57ee00ff2f8e124cffdb0bbb196f11b4",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.EP",
    "submitted_at": "2025-07-23T17:21:04Z",
    "title_canon_sha256": "843ac2108ff9fd9aab86564cea5f06b56ab5be320ff82ed030a75174ada5c2d7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2507.17710",
    "kind": "arxiv",
    "version": 1
  }
}