Pith Number

pith:QIQV5RB6

pith:2009:QIQV5RB6WQBNZV2AZUB676FXLP

not attested not anchored not stored refs pending

Causal structure and algebraic classification of area metric spacetimes in four dimensions

Christof Witte, Frederic P. Schuller, Mattias N.R. Wohlfarth

arxiv:0908.1016 v1 · 2009-08-07 · hep-th

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

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	2026-05-18T04:25:51.107951Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

82215ec43eb402dcd740cd03eff8b75bf418f0bbe127b7fd375f03c0e65dd554

Aliases

arxiv: 0908.1016 · arxiv_version: 0908.1016v1 · doi: 10.48550/arxiv.0908.1016 · pith_short_12: QIQV5RB6WQBN · pith_short_16: QIQV5RB6WQBNZV2A · pith_short_8: QIQV5RB6

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/QIQV5RB6WQBNZV2AZUB676FXLP \
  | 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: 82215ec43eb402dcd740cd03eff8b75bf418f0bbe127b7fd375f03c0e65dd554

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f6b2b78401a30cc4a28ee80ed29f5074ec7b663fb5f144dc8604e3580d648553",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "hep-th",
    "submitted_at": "2009-08-07T10:19:35Z",
    "title_canon_sha256": "925edcb546c2d5a3c62930708dd5e254cdbda5375b2be02ebae3f87ce45ec8f1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0908.1016",
    "kind": "arxiv",
    "version": 1
  }
}