Pith Number

pith:6QMP5RRO

pith:2019:6QMP5RROJOUI7YXIQQWTQFLWUF

not attested not anchored not stored refs pending

Early black-hole seeds in the first billion years

Umberto Maio

arxiv:1908.04823 v4 · 2019-08-13 · astro-ph.GA · 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{6QMP5RROJOUI7YXIQQWTQFLWUF}

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	2026-07-05T01:09:27.756225Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f418fec62e4ba88fe2e8842d381576a1626c56aaba4d8dfb40db20a1e5e5c90c

Aliases

arxiv: 1908.04823 · arxiv_version: 1908.04823v4 · doi: 10.48550/arxiv.1908.04823 · pith_short_12: 6QMP5RROJOUI · pith_short_16: 6QMP5RROJOUI7YXI · pith_short_8: 6QMP5RRO

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/6QMP5RROJOUI7YXIQQWTQFLWUF \
  | 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: f418fec62e4ba88fe2e8842d381576a1626c56aaba4d8dfb40db20a1e5e5c90c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e803c4162c670ee940429b4870dfa06a9c1d406b695f15f7bfc81017e9d991a1",
    "cross_cats_sorted": [
      "astro-ph.HE"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2019-08-13T18:55:10Z",
    "title_canon_sha256": "b1e34e5019ca29531becd292effbc96742c028c8e6e876f4a24c0957673e0c81"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1908.04823",
    "kind": "arxiv",
    "version": 4
  }
}