Pith Number

pith:MM2V5VTL

pith:2012:MM2V5VTLQKIPLDRRAGH33LGMHY

not attested not anchored not stored refs pending

Gravity in Twistor Space and its Grassmannian Formulation

David Skinner, Freddy Cachazo, Lionel Mason

arxiv:1207.4712 v2 · 2012-07-19 · hep-th · gr-qc

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{MM2V5VTLQKIPLDRRAGH33LGMHY}

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	2026-05-18T02:52:49.691542Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

63355ed66b8290f58e31018fbdaccc3e3dcb675dd2c99ec014401121622fe73a

Aliases

arxiv: 1207.4712 · arxiv_version: 1207.4712v2 · doi: 10.48550/arxiv.1207.4712 · pith_short_12: MM2V5VTLQKIP · pith_short_16: MM2V5VTLQKIPLDRR · pith_short_8: MM2V5VTL

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/MM2V5VTLQKIPLDRRAGH33LGMHY \
  | 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: 63355ed66b8290f58e31018fbdaccc3e3dcb675dd2c99ec014401121622fe73a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4b6be7582b7509ee95af419361180e38645e8e909265554c7a67f71411fc765b",
    "cross_cats_sorted": [
      "gr-qc"
    ],
    "license": "http://creativecommons.org/licenses/by-nc-sa/3.0/",
    "primary_cat": "hep-th",
    "submitted_at": "2012-07-19T15:42:41Z",
    "title_canon_sha256": "f9bf97d9f8647466d6ccd5cd4eddfac1a97406cb62c660eea68994ed546e0f89"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1207.4712",
    "kind": "arxiv",
    "version": 2
  }
}