Pith Number

pith:Q77Q3RXF

pith:2022:Q77Q3RXFDHIOVHJOI2EXUSCQSQ

not attested not anchored not stored refs pending

The ngEHT's Role in Measuring Supermassive Black Hole Spins

Aditya Tamar, Angelo Ricarte, Paul Tiede, Priyamvada Natarajan, Razieh Emami

arxiv:2211.03910 v1 · 2022-11-07 · astro-ph.HE

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{Q77Q3RXFDHIOVHJOI2EXUSCQSQ}

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	2026-07-05T05:13:59.811604Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

87ff0dc6e519d0ea9d2e46897a4850942cd9bf1c943b490d13891f8b28a1eecc

Aliases

arxiv: 2211.03910 · arxiv_version: 2211.03910v1 · doi: 10.48550/arxiv.2211.03910 · pith_short_12: Q77Q3RXFDHIO · pith_short_16: Q77Q3RXFDHIOVHJO · pith_short_8: Q77Q3RXF

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/Q77Q3RXFDHIOVHJOI2EXUSCQSQ \
  | 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: 87ff0dc6e519d0ea9d2e46897a4850942cd9bf1c943b490d13891f8b28a1eecc

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "53289b05f249c31b0d85e9096b956d2043bc6a95f14d307a6aa84ff1644b225b",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2022-11-07T23:37:47Z",
    "title_canon_sha256": "a7089c0b6162b34546b943596c5cb31d94d870ed913e976e38e2140e18514165"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2211.03910",
    "kind": "arxiv",
    "version": 1
  }
}