Pith Number

pith:NNDGNZOH

pith:2013:NNDGNZOH23P44BYWYGLS5NUZAM

not attested not anchored not stored refs pending

Linking covariant and canonical LQG II: Spin foam projector

Antonia Zipfel, Thomas Thiemann

arxiv:1307.5885 v2 · 2013-07-22 · 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{NNDGNZOH23P44BYWYGLS5NUZAM}

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	2026-05-18T01:48:41.411157Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6b4666e5c7d6dfce0716c1972eb6990332cc481f9ba85a52960aa8c27b19399a

Aliases

arxiv: 1307.5885 · arxiv_version: 1307.5885v2 · doi: 10.48550/arxiv.1307.5885 · pith_short_12: NNDGNZOH23P4 · pith_short_16: NNDGNZOH23P44BYW · pith_short_8: NNDGNZOH

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/NNDGNZOH23P44BYWYGLS5NUZAM \
  | 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: 6b4666e5c7d6dfce0716c1972eb6990332cc481f9ba85a52960aa8c27b19399a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a4f1de2e17b575ba5ec80e696b8c41c4308db7b777829a22e9ce9febfa30056c",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "gr-qc",
    "submitted_at": "2013-07-22T20:56:17Z",
    "title_canon_sha256": "50d5de57c4f691b10017fa4cc09760f0cb0a196a3ddfe51a732bb4b1f6c4018b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1307.5885",
    "kind": "arxiv",
    "version": 2
  }
}