Pith Number

pith:S72DQM2H

pith:2018:S72DQM2HQFKWROFXMGYCIGA7W7

not attested not anchored not stored refs pending

A time machine for free fall into the past

Davide Fermi (Universita' di Milano), Livio Pizzocchero (Universita' di Milano)

arxiv:1803.08214 v3 · 2018-03-20 · gr-qc · hep-th

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{S72DQM2HQFKWROFXMGYCIGA7W7}

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	2026-05-18T00:06:25.057584Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

97f4383347815568b8b761b024181fb7d012a0ce3b44b3217150a0e56e20cd5a

Aliases

arxiv: 1803.08214 · arxiv_version: 1803.08214v3 · doi: 10.48550/arxiv.1803.08214 · pith_short_12: S72DQM2HQFKW · pith_short_16: S72DQM2HQFKWROFX · pith_short_8: S72DQM2H

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/S72DQM2HQFKWROFXMGYCIGA7W7 \
  | 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: 97f4383347815568b8b761b024181fb7d012a0ce3b44b3217150a0e56e20cd5a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bf850b8c1acee1438642b6de551f9d735f736a70df301162f625b9ec093b32c2",
    "cross_cats_sorted": [
      "hep-th"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "gr-qc",
    "submitted_at": "2018-03-20T17:04:08Z",
    "title_canon_sha256": "10777be3b7cc7d6aa84b9b88635976a6768f7a9957a299fc31aedd4acec7f8b1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1803.08214",
    "kind": "arxiv",
    "version": 3
  }
}