Pith Number

pith:M6CUYLUW

pith:2021:M6CUYLUWMD6BIMH5OPJV2PF6QX

not attested not anchored not stored refs pending

Hearts of Darkness: the inside out probing of black holes

Francesco Di Filippo, Ra\'ul Carballo-Rubio, Stefano Liberati

arxiv:2106.01530 v1 · 2021-06-03 · 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{M6CUYLUWMD6BIMH5OPJV2PF6QX}

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	2026-07-05T03:51:28.338499Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

67854c2e9660fc1430fd73d35d3cbe85e6f201d87f0e69db7a0675bc1da1d0a1

Aliases

arxiv: 2106.01530 · arxiv_version: 2106.01530v1 · doi: 10.48550/arxiv.2106.01530 · pith_short_12: M6CUYLUWMD6B · pith_short_16: M6CUYLUWMD6BIMH5 · pith_short_8: M6CUYLUW

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/M6CUYLUWMD6BIMH5OPJV2PF6QX \
  | 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: 67854c2e9660fc1430fd73d35d3cbe85e6f201d87f0e69db7a0675bc1da1d0a1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b9553c38f2cfb188a901a6329d34c6eb3dd0cc047b0b11242f31daee5fdb261b",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "gr-qc",
    "submitted_at": "2021-06-03T01:23:15Z",
    "title_canon_sha256": "2dc41915e49499d1ae05ac86a0c4924d2ab2d84228b1bb6fe2766a70b437fc5f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2106.01530",
    "kind": "arxiv",
    "version": 1
  }
}