Pith Number

pith:N2K46A5A

pith:2018:N2K46A5AJLKTLF3A7G4U4ZXFDW

not attested not anchored not stored refs pending

4G: Pure fourth-order gravity

Shuxun Tian

arxiv:1807.06432 v1 · 2018-07-17 · gr-qc · astro-ph.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{N2K46A5AJLKTLF3A7G4U4ZXFDW}

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.

Cited by

1 paper in Pith

Testing the Schwarzschild metric in a strong field region with the Event Horizon Telescope

Receipt and verification

First computed	2026-05-18T00:10:33.056869Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6e95cf03a04ad5359760f9b94e66e51d89a38bf1dbbadaf376dc1a2b2f78efb9

Aliases

arxiv: 1807.06432 · arxiv_version: 1807.06432v1 · doi: 10.48550/arxiv.1807.06432 · pith_short_12: N2K46A5AJLKT · pith_short_16: N2K46A5AJLKTLF3A · pith_short_8: N2K46A5A

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/N2K46A5AJLKTLF3A7G4U4ZXFDW \
  | 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: 6e95cf03a04ad5359760f9b94e66e51d89a38bf1dbbadaf376dc1a2b2f78efb9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9e20b8343698dcd8c4cc522fa22890b69635be911fc89c603f6fff465a269c2c",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "gr-qc",
    "submitted_at": "2018-07-17T13:50:54Z",
    "title_canon_sha256": "39a67e463206715566a9355457296ff35f66c0cc84dde1a9ec2413c68449ec00"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1807.06432",
    "kind": "arxiv",
    "version": 1
  }
}